Philosophy

**Um was geht es dieses mal?** Dieses Mal dreht sich alles um aktuelle Herausforderungen, Best Practices und Trends rund um IT-Sicherheit. Freut euch auf praxisnahe Einblicke, spannende Diskussionen und den Austausch mit Security-Expert:innen. **So leicht können Hacker Ihr Unternehmen über öffentliche Daten angreifen - Mehmet Avci (codecentric)** Jedes Unternehmen hinterlässt einen digitalen Fußabdruck – oft unbemerkt, aber öffentlich zugänglich. Genau diese frei verfügbaren Informationen machen sich Angreifer im Rahmen von Open Source Intelligence (OSINT) zunutze, um gezielte Angriffe vorzubereiten, ohne dabei technische Schutzmechanismen direkt angreifen zu müssen. In diesem Talk wird gezeigt, wie einfach es für Angreifer ist, Unternehmen allein auf Basis öffentlich verfügbarer Daten zu analysieren und zu kompromittieren. Nach einer Einführung in die Grundlagen von OSINT und die typischen Phasen eines OSINT‑Prozesses werden verschiedene Techniken vorgestellt und eingeordnet. Dazu gehören unter anderem Subdomain‑Enumeration, Google Dorking, die Auswertung von Unternehmensinformationen, Social‑Media‑Analysen, das Sammeln von E‑Mail‑Adressen sowie die Nutzung von Datenlecks und Breach‑Daten. Anhand praxisnaher Beispiele aus realen Szenarien wird verdeutlicht, wofür diese Techniken eingesetzt werden und wie Angreifer die gewonnenen Informationen miteinander kombinieren, um detaillierte Profile von Organisationen, Infrastrukturen und Mitarbeitenden zu erstellen. Der Vortrag schärft das Bewusstsein dafür, wie aus scheinbar harmlosen Einzeldaten ein ernstzunehmendes Sicherheitsrisiko entstehen kann – und warum OSINT ein zentraler Bestandteil moderner Angriffe ist. **This is fine - until it's not - Christian Uhsat (codecentric)** Was passiert, wenn was passiert? Erfahrungsberichte aus Digitaler Forensik und Incident Response im Kampf gegen Cybercrime, Ransomware und den allgemeinen Wahnsinn. **Hybrides Setup!** Wir freuen uns, euch bei uns in den Räumen der codecentric AG in Dortmund willkommen zu heißen. Vor Ort versorgen wir euch mit Snacks und Getränken und freuen uns gleichzeitig über interessante Diskussionen und einen guten Austausch. Für alle, die es nicht zu uns ins Office schaffen, werden wir das Meetup Hybrid durchführen. Der Stream beginnt ca. 10 Minuten später, damit wir vor Ort ausreichend Möglichkeit für persönliches Kennenlernen haben. Den Live-Stream findet ihr auf dem [YouTube-Channel ](https://www.youtube.com/@codecentricAG)der codecentric AG. **Wichtig - Absage bitte rechtzeitig:** Wir bestellen das Essen bereits 3 Tage vor dem Meetup. Falls ihr doch verhindert sein solltet, bitten wir euch um eine rechtzeitige Absage. Das ist wichtig, damit wir nicht unnötig Essen verschwenden müssen. Vielen Dank für euer Verständnis! **Anreise:** Per Zug: Vom Dortmunder HBF sind es ca. 10 Minuten zu Fuß. Mit dem Auto: Rund um das Office gibt es einige Parkflächen, dazu befinden sich in dem Parkhaus der Thier-Galerie weitere Parkplätze.

Op dinsdag 12 mei organiseren we weer een SIDN TechTalk! Dit jaar is voor ons een speciaal jaar, SIDN bestaat namelijk 30 jaar en het .nl-domein bestaat zelfs 40 jaar. Een echt jubileumjaar dus! Al 30 jaar zorgen wij met trots voor het .nl-domein, een van de grootste en veiligste landendomeinen ter wereld! Dit jubileum laten we natuurlijk niet stilletjes voorbijgaan. Daarom staat deze TechTalk in het teken van 30 jaar SIDN en 40 jaar .nl. Ook dit keer hebben we 2 interessante sprekers én een lekkere maaltijd. Laat je inspireren en kom op 12 mei naar de SIDN TechTalk. Meld je snel aan! **Programma** **18.00 – 19.00 uur: inloop met (buffet)diner** Zorg dat je nog niet gegeten hebt, want wij zorgen voor een lekkere gratis maaltijd! **19.00 – 19.45 uur Talk 1:** **Een reis door 30 jaar aan SIDN-infrastructuur – Marc Groeneweg** Marc neemt jullie mee door 30 jaar aan SIDN-infrastructuur: van de tijd waarin .nl draaide op een paar servers en een flinke dosis pioniersmentaliteit, tot de moderne, robuuste en soms bijna eigenwijze systemen van nu. Het wordt een reis langs hoogtepunten, “creatieve oplossingen” en technische keuzes die ons hebben gebracht waar we staan - en waar we soms achteraf om kunnen lachen. Laten we beginnen aan deze tijdreis door 3 decennia techniek… zonder rollbackplan. *Over Marc Groeneweg* Marc is senior DNS-engineer en product owner met ruim 20 jaar ervaring bij SIDN, met uitgebreide expertise in het ontwerpen, beveiligen en beheren van autoritatieve DNS-diensten en wereldwijde DNS-anycastinfrastructuren. Bedreven in DNSSEC, zonebeheer, DNS-publicatieprocessen en grootschalige netwerkinfrastructuren. Beschikt over een sterke achtergrond in ICT-projectmanagement, securityarchitectuur en procesverbetering. **19.45 – 20.30 uur Talk 2:** **Digitale autonomie: gisteren, heden en in de toekomst – Daniel Karrenberg** Daniel neemt je aan de hand van een reeks persoonlijke verhalen mee langs de ‘geboorte’ van .nl en RIPE in de Amsterdamse Watergraafsmeer, via individuele keuzes voor meer autonomie tot strategieën voor de toekomst. Wat hebben wij geleerd en wat kunnen wij doen nu en in de toekomst op het gebied van digitale autonomie? Discussie gewenst! *Over Daniel Karrenberg* Daniel Karrenberg is een van de pioniers van het internet in Europa. In de jaren 1980 hielp hij bij de opbouw van EUnet, de eerste pan-Europese internet service provider. In die tijd deelde hij een kantoor met Piet Beertema, de eerste beheerder van .nl. In 1989 was Daniel een van de oprichters van RIPE (Réseaux IP Européens), het belangrijkste samenwerkingsforum in Europa voor internetcoördinatie. In de jaren 1990 leidde Daniel de oprichting van het eerste regionale internet registry ter wereld, RIPE Network Coördination Centre (RIPE NCC), dat Europa, het Midden-Oosten en eerder ook delen van Afrika en Centraal-Azië bedient. Daniel was CEO van RIPE NCC van 1992 tot 2000 en chief scientist van 2000 tot 2013. In deze rol heeft hij een groot aantal activiteiten geleid, waaronder de RIPE Routing Information Service (RIS), het wereldwijde meetplatform RIPE Atlas, de DNS Monitoring Service (DNSMON), RIPEstat en, samen met NLnet Labs, de Name Server Daemon (nsd). In 2001 ontving Daniel de gerenommeerde Jon Postel Internet Service Award "voor twee decennia van buitengewone toewijding aan de ontwikkeling van netwerken in Europa en wereldwijd"; in 2012 werd hij opgenomen in de Internet Hall of Fame. **20.30 - 21.00 uur: Napraten onder het genot van een borrel.** **Taal** De sessies zijn in het Nederlands. **Meenemen** Identiteitsbewijs **Aanmelden/afmelden** Het bezoeken van TechTalk is gratis. Wij maken natuurlijk wel kosten. Heb je je aangemeld, maar kan je er toch niet bij zijn? Meld je dan snel af, dan kunnen wij jouw plek aan een ander geven.

**3D Workshop** * **Ontwerpen met Fusion360** * **Scannen in 3D** * **Het gebruik van 3D printers** **Je bent nu welkom in de nieuwe locatie NewTechPark** Je kunt ook online aan deze fysieke bijeenkomst deelnemen. De bijeenkomst is dan op de locatie te volgen. Als je [hier](w.j.put@hccnet.nl) vooraf een mailtje stuurt kun je dinsdagavond tussen 19.00 en 20.00 uur inloggen met Jitsi voor vragen, of ter kennismaking met hcc!3D. Online neem je deel aan de bijeenkomst met [https://wij.hcc.nl/3D](https://wij.hcc.nl/3D) [(Alleen toegang als je zichtbaar bent met voor- en achternaam. )](https://wij.hcc.nl/3d)

Boardgame night #173 The idea is: play a game, have a drink and chat with friendly people. We start around 20.00 with playing board games so that's the perfect time to jump in and play with us. We will bring a couple board games, but you're also welcome to bring your own games. Feel free to join, bring friends or family. We hope to play with you then! You can also signup on facebook. Visit us at: [https://m.facebook.com/groups/463859440486833](https://m.facebook.com/groups/463859440486833)

**Lets go!** Edition 1 of the Coding Dojo in Utrecht! Kata will be announced later, but this will be a fun one.. **Please RSVP so we can order enough pizzas 🍕** **18:00 - 21:00 hours, walk-in from 17:30** Drift 17, Utrecht (bus stop Janskerkhof)

Is public speaking something you’ve always wanted to learn? Then you’ve come to the right place! Experience a safe and playful environment at U-Speak Toastmasters where you can develop your public speaking, communication, and leadership skills! ## **Welcome to U-Speak! Toastmasters** Join our vibrant community at U-Speak!, where internationals and Dutch locals from Utrecht and its surroundings come together. U-speak! Toastmasters is a welcoming, safe, supportive and playful environment where you can work on your public speaking, communication and leadership skills! We created a waiting list for new members, however guest visits are much appreciated. See below for more info 👇 ## **Discover our meeting experience** Curious about what happens during our meetings? Here’s a glimpse into a typical evening at U-Speak! Our gatherings feature a lineup of three prepared speeches, engaging evaluations and impromptu speaking sessions. At U-Speak!, every member gets their chance to shine. Whether you’re delivering a speech, providing feedback, or stepping up for impromptu speaking, our supportive environment ensures that everyone’s voice is heard and valued. * ⏰ Time: 19:15 - 21:30 (7.15pm to 9.30pm) Walkin at 19:15; Start of the meeting at 19:30 * 🌐 Venue: Room 8, Top Floor, Pub Florin, Utrecht * 🙋🙋‍♂️🙋‍♀️Attendance: Typically, 15-20 people attend each meeting Many of our club members are not on Meetup, so the number of people attending as indicated here is not reflective of the actual number of people attending on a night. * 🙋🙋‍♂️🙋‍♀️ Guests are welcome; rsvp is encouraged *To maintain the high quality of our meetings and ensure all members have sufficient speaking opportunities, we've established a waitlist for new members. This allows us to provide the best possible learning experience for everyone. We're happy to add your name to our list, and we encourage you to join us as a guest in the meantime.*

Dyslexie Cafe Utrecht is er voor alle conceptuele denkers. Voor mensen met dyslexie, hun naasten
 en voor iedereen met een brein dat net even anders werkt. Een plek voor ontmoeting en herkenning. Hier hoef je niet uit te leggen
waarom je hoofd sneller denkt dan je hand kan schrijven.
Of waarom je ideeën grenzeloos zijn
maar niet altijd uitkomen zoals je zou willen. Hier mag je binnenlopen bij mensen die weten hoe het voelt. en schaamteloos jezelf zijn. Tijdens het cafe creëren we ruimte, praten we over de krachten en de uitdagingen. Niet hangen en luisteren maar interactief ontdekken. Soms met een thema.
 Soms ontstaat het gesprek vanzelf.
 De inhoud wordt mede bepaald door jou. Kom en deel je verhaal, stel vragen en ontdek nieuwe inzichten met mensen zoals jij.

## 🎨**Activity for EXPATS & English Speakers** ☕ Are you an art enthusiast living in or around **Amersfoort, Hilversum, Utrecht, Nieuwegein, IJsseltein, De Bilt and the rest of cities of the Utrecht's province** who love painting or drawing? Maybe you've felt the joy of creating but struggled to find others who share your passion and speak **ENGLISH**? **You're not alone! 😉** ✨✨✨✨✨✨✨ ## 🖌️**About this event** You will meet other Art Lovers like you to Draw, Paint and have some drinks Together ! Our events are not just about sketching or creating art—they’re about building connections. Every two weeks, we meet at a café to have a relaxing time drawing a painting. Please keep on mind that **ENGLISH i**s the official language we will use to integrate everyone in our conversations. ⭕⭕⭕➡️ **IMPORTANT ⬅️** ⭕⭕⭕⭕ ### 👩🏻‍🎨**Book formally your Seat 🪑via [WHATSAPP](https://bit.ly/3BXXE0f)** **If you want to confirm officially your attendance and separate your seat🪑. Book your seat in meet-up, and contact us via [WHATSAPP HERE](https://bit.ly/3BXXE0f) to receive more information on the address of our activities.** **Thanks a lot for your understanding!** 💐🥰 ✨✨✨✨✨✨✨ ### 👩🏻‍🎨**How Does It Work?** This event is simple, this initiative takes 2 Hours. Most of the participants use pencils, water pencils or watercolours. Main aim is to socialize while we draw. There will be plenty of time to talk and get to know each other. We have to mention that this event is suitable for all levels. Many have started to draw in our event actually. Also it is very important that you **[JOIN US AT OUR WHATSAPP COMMUNITY](https://bit.ly/3BXXE0f),** to stay up to date on our upcoming events and participate in our Drawing and Painting Contests! **👉: [https://bit.ly/3BXXE0f](https://bit.ly/3BXXE0f)** 🍀 ✨✨✨✨✨✨✨ ### ☕**Where?** We will meet in different cafes mainly in the *center of Amersfoort ( and some occasions in other cities around)*. I will inform you of the exact place some days in advance this event. The place will depend on the number of attendees. ✨✨✨✨✨✨✨ ### **🎟️ What is included?** 🟢 **2 HOURS TO HAVE FUN!** 🟢 **15 mins warming-up creative activity and paper material**🖌️🎨 🟢 New friendships and **conversations in ENGLISH** in a relaxed atmosphere 🟢 **Souvenir picture** with you and the rest of Art Lovers 📷 🟢 Exclusive **access to our Art Lovers Community** on which you will receive: ***\~\~\~ Drawing challenges,*** ***\~\~\~ Training content,*** ***\~\~\~ FREE Entries only to members*** ***\~\~\~ Drawing Competitions*** 🟢 Time to **create alongside fellow artists and amateurs** 🟢 The freedom to **work at your own pace** 💃🕺🎈 ✨✨✨✨✨✨✨ ### 🖼️**Art Materials?** Bring your own practical art materials to be adaptable to sketch on a coffee table. Like your sketchbook, pencils, watercolor, markets, pencils, your Tablet..etc ✨✨✨✨✨✨✨ ## **See you to Paint, Draw, and drink together!🌟☕🍷🍪🍰**

Have you always wanted to visit the Netherlands, but for no specific reason, you never actually did it? How about spending a weekend of street photography in one of the most beautiful Dutch cities-Utrecht-with me? | lived in Utrecht for 8 years and can show you all the beautitul spots. Find more details on my website! Workshop Details Where: Utrecht, The Netherlands When: 16.05.2026 Time: 07:30 — 10:30PM What you’ll Learn * Master how to use natural light and shadow to create striking black and white images * Capture candid street moments with confidence * Embrace ICM (Intentional Camera Movement), a creative technique that combines deliberate camera movement with a slow shutter speed to create abstract, painterly images * Discover the timeless beauty of black and white street photography Your participation costs 150 CHF. Please register directly through my website to secure your spot: www.katjabouwman.com/workshops More info on www.katjabouwman.com/workshops or visit my Instagram account katja_zuerich

We’re heading out for a beautiful cross border hike through forest, heathland, open landscapes, and a very special midpoint stop: **De Achelse Kluis**, a historic abbey on the border between the Netherlands and Belgium. The hike starts in the Netherlands and takes us through the peaceful **Leenderbos**, one of the most atmospheric forest areas in North Brabant. Expect woodland paths, sandy tracks, heath, open views, and that lovely Veluwe style feeling of moving between forest and open landscape. As we continue south, we make our way toward the Belgian border and our main break location: **De Achelse Kluis**. This unique abbey complex lies between **Hamont Achel** and **Leende**. With roots going back to the 17th century, and later known as a Trappist abbey, it offers a beautiful neogothic setting with a brasserie, abbey shop, and a calm historic atmosphere. After several kilometers of forest and heathland walking, arriving at the abbey will feel like a real reward. We’ll take our longer break here, with the option to enjoy the brasserie, have a coffee, try Limburgse vlaai, taste an abbey beer, or simply relax around the grounds. After the break, we cross back into the Dutch side and return through the Leenderbos, completing a full loop through forest, heathland, and quiet countryside. A hike with forest energy, abbey atmosphere, monks’ history, and a touch of Belgium. 📲 **WhatsApp group** I’ll open a temporary WhatsApp group for everyone signed up before the hike, so we can coordinate carpooling, final break arrangements, and any last minute updates. **📍When and where to meet?** We’ll meet at 11h15 at Busstop "Leende, Valkenswaardseweg/A2"" https://maps.app.goo.gl/Uij4AmfEos2foDbQ8 ⏰ **We start walking a few minutes after meeting up** We don’t wait for latecomers, as we have a long route ahead and want to enjoy the full day properly. **🚗 Coming by car?** Please check your parking options beforehand so you arrive on time. **⏸️ Planned Breaks** After around **10 km:** 60 minute break at **De Achelse Kluis** I still need to confirm the practical arrangements with the brasserie, including whether we can just have drinks or whether we need to order food as well. I’ll share the update in the WhatsApp group once confirmed. **💸 Payment** Please pay as soon as you sign up: To keep things fair for everyone, if we don’t receive your payment within 48 hours, we will need to remove you from the participant list. If there’s a waiting list, this will happen sooner (in less than 48 hours). If that happens, no worries — you’re always welcome to sign up again if there’s space. 🌟 Early Bird Deal! Join now for just €4 — available for 3 days (72h). After that, the price will be €5. Please pay here: https://tikkie.me/pay/ute915nnuvqfl74002hh **👟 Good to know** * Refund policy: Cancellations are fully refundable up to 1 week before the event (This is Friday 8 May at 23h59). After this period, the fee becomes non-refundable. * Hike difficulty: Our hikes are moderately challenging. Please only join if you’re confident you can keep up with the group’s pace (5 km/ h)— it’s more fun for everyone when we can walk together without long waits. * If the pace is too challenging: We may kindly suggest you continue at your own pace. We’ll give you clear directions to the nearest bus or train so you can return comfortably. * At your own risk: You participate at your own risk, so please make sure you have appropriate insurance coverage for outdoor activities. * Payment note: With Tikkie we only see initials (e.g., J. Doe instead of John Doe). Please include your Meetup name in the payment note so we can match it easily. * Friends joining: If you bring a friend, make sure they also register and pay. * What to bring: Snacks and water. * Stay connected: Join our WhatsApp group to be the first to hear about future hikes — ask for the QR code during the hike. * T-shirts: Fairwear-certified organic cotton, eco-friendly inks — €25. Sustainable, odor-resistant, and perfect for hiking. Let us know your size and we’ll bring one for you.

Have you always wanted to visit the Netherlands, but for no specific reason, you never actually did it? How about spending a weekend of street photography in one of the most beautiful Dutch cities-Utrecht-with me? | lived in Utrecht for 8 years and can show you all the beautitul spots. Find more details on my website! Workshop Details Where: Utrecht, The Netherlands When: 17.05.2026 Time: 12:00 — 15:00 AM What you’ll Learn * Master how to use natural light and shadow to create striking black and white images * Capture candid street moments with confidence * Embrace ICM (Intentional Camera Movement), a creative technique that combines deliberate camera movement with a slow shutter speed to create abstract, painterly images * Discover the timeless beauty of black and white street photography Your participation costs 150 CHF. Please register directly through my website to secure your spot: www.katjabouwman.com/workshops

**RSVP's at MeetUp.com are limited to a total of 10 and will be ignored. If you would like us to wait for you when we walk, please register for this photowalk at our Clubhouse:** [https://www.heylo.com/events/94898f98-af8d-4b65-b31d-922abfe6568e/-OrIio1QR8h3tjQXgzFM](https://www.heylo.com/events/94898f98-af8d-4b65-b31d-922abfe6568e/-OrIio1QR8h3tjQXgzFM) *\* The event is listed at MeetUp for promotion only.* *\* The number of attendees listed here is not the actual number.* \~ During this walk, you’ll capture how different historical periods coexist in the city — from medieval to modern. The idea is to photograph how Utrecht’s rich history blends with contemporary life, offering a visual journey through time. Think about old facades vs. modern shops, or capture the contrast between historic buildings and modern hustle. Alternatively, as bonus assignment, you can also do a color hunt. Each participant picks one color and during the photowalk, looks for subjects where that color clearly stands out. The goal is to make at least three photos that work together as a small series. This challenge is about training your eye, improving composition, and becoming more aware of color and subjects in everyday scenes. Submit a collage on Heylo, displaying your time capture, or selected color. We will meet at Domplein, near the Sun (big orb) in front of the Academiegebouw of Universiteit Utrecht. The planned route is: [https://www.google.com/maps/d/viewer?mid=1rkouqq2VDsGSWb_Zgve9V7R6KAjhtw4](https://www.google.com/maps/d/viewer?mid=1rkouqq2VDsGSWb_Zgve9V7R6KAjhtw4) The walk is about 4km, so we expect to finish around 16:00. After the walk we could stop for a drink at Mariaplaats (optional, not included and at your own expense), share our results and talk photography. ***Let's meetup and have fun!*** *Please note:* * ***The photowalk starts at the posted time.*** Try to be there early, but if you are running late... just find us. The link to live location of the group (via Google Maps) will be shared in the Event Chat in our Clubhouse at [https://heylo.group/utrechtphotography](https://heylo.group/utrechtphotography). * ***If you register for this photowalk and you can not make it, please update your RSVP!*** * The photowalk could be cancelled or postponed in case of really bad weather. * The end time is an estimate only; the length of the actual walk could be different from posted. * Check before you go if all your equipment is working properly; lens cleaned, batteries charged, memory cards empty. * ***Come prepared:*** wear comfortable shoes, bring water and a snack, check the weather forecast - and don't forget your camera * The organisation is not responsible for any personal injury, loss, or damage to personal property during the photowalk. Participants are advised to have appropriate (travel/liability) insurance. * During the walk, pay attention to your surroundings, traffic, curbs and people. * ***Be respectful of residents, their property and privacy.*** *And finally:* * Any type of camera is welcome. * If taking pictures or making photos gives you joy, you are more than welcome!

Gran Fondo Rosa is a must ride in the Netherlands, and since years we are riding under the ATAC flag! 3 distances available: 80, 120 and 170km. It’s a sportive so not a race, you choose your pace and we enjoy the race ride. Roads are closed and there are food and drink stops along the way. When signing up, select FRIEND TEAM and then type ATAC as the team. We will have our own table at the pasta party. Sign up here: https://www.nltourrides.nl/gran-fondo-rosa/#inschrijving Cheers !

Main Library, Meeting Room 2B Join us for a welcoming evening of reflection, gentle music, and meaningful conversation. We’ll begin with a short grounding moment, followed by a brief reading from spiritual or philosophical traditions, and an open reflection circle where participants can share (or simply listen). Libera Animae is an interfaith community focused on inner growth, creativity, and authentic connection. All backgrounds are welcome.

Sleep in on Sundays. When you've had your fill of pajama-time, roll out and have some tasty brunch with your fellow Humanists!

ASH is Atheists, Skeptics and Humanists of First Unitarian Universalists of Columbus Ohio TBD Snacks are usually available, and you are welcome to bringing something to share!

Jimmy V's Grill & Pub in Grandview Heights. You are responsible for your own meal/drinks. We usually don't have any agenda other than eat, drink and talk. :) If the weather is nice we will be on the back patio, otherwise we are in the cigar room. This group has been meeting every Tuesday evening for over a decade. Many attendees do not RSVP on meetup. Please don't let the small number here discourage you. Anyone/everyone is welcome to come. We'd love to have you join us. COTA bus #5 comes to W. 5th and Wyandotte Rd. And it's a minute walk to the restaurant.