On November 18 Cloudflare experienced a service outage. Here's a detailed breakdown of what happened. https://cfl.re/43Bw8AI

Getting very close to the end of my author client @bzotto.bsky.social’s ”Go Computer Now!” book Kickstarter project! It’s a great read, and wild to learn about a significant entry in the history of personal computing that was almost entirely forgotten. Colorful characters and a tale well told!

Last few days for funding “Go Computer Now!”, a book about the nearly forgotten, pioneering Utah computer firm Sphere (1975–1977) that you likely *never heard about*. (I edited the book.) Help us get over the last hump at www.kickstarter.com/projects/bzo... @bzotto.bsky.social

If you love data at scale, engineering, and you're a determined, creative problem solver, the Cloudflare Radar team is looking for an experienced Data and Analytics Engineer to join our team. job-boards.greenhouse.io/cloudflare/j...

Cloudflare used historical data to investigate reports of potential new firewall tests in Turkmenistan. Shifts in TCP resets/timeouts across ASNs corroborate large-scale network control system changes. https://cfl.re/4nwaCV3

IPv4 scarcity drives widespread use of CGNAT, a practice in ISPs that places many users behind one IP address, along with their collected Internet activity. We introduce the method we’ve developed to detect large-scale IP sharing globally and mitigate the issues that result.

Go Computer Now! – The Story of Sphere Computers. “If things had gone a little differently for them, we might be remembering Sphere the way people have fond memories of the Commodore 64 and Apple II.” Wow, I’ve never heard of Sphere. [kickstarter.com]

Backed!

Proud of the @radar.cloudflare.com team for the work done to add three great new data sets to Radar -- we're constantly expanding visibility into what's happening on the #Internet! 🧵

Hopefully it won’t suck.

I didn't realize my Macbook Air had a dialup modem... 🤣

Multiple reports of a brief #Starlink outage earlier this morning corroborated by a significant drop in HTTP requests between 04:00-05:00 UTC. Large burst of #BGP announcements seen at that time as well. Announced IP address space also saw some shifts. radar.cloudflare.com/routing/as14...

For Apple devices, it's already started to grow over the last several months as beta and RC versions of iOS and MacOS 26 became available.

Keep an eye on radar.cloudflare.com/adoption-and... next week as Apple releases their latest OS upgrades - we expect to see Post-Quantum adoption grow!

Who here do I know that hosts their own webpages or blogs? A postdoc colleague and I would like to ask a few fast questions about your traffic patterns over the last 5 years. (please reshare for reach thank you!)

The Radar team's latest work on bringing increased visibility to traffic from AI crawlers.

On August 20, Let' s Encrypt switched certificate issuance to use intermediate certificates R12 and R13, retiring the use of R10 and R11. The shift is clearly visible in our Certificate Transparency graphs, starting ~18:00 UTC. community.letsencrypt.org/t/switching-...

Pakistani backbone provider PTCL is experiencing a near-complete outage, with traffic dropping over 90% around 16:10 UTC. Interestingly, traffic to Cloudflare's 1.1.1.1 DNS Resolver spiked concurrently with the observed outage. radar.cloudflare.com/traffic/as17...

A nominal Starlink disruption lasted less than 15 minutes, between 17:40-17:55 UTC. Biggest impacts to traffic were observed in the United States, Canada, Mexico, Germany, the United Kingdom, and Nigeria. No word yet on what caused the disruption.

🎃 Save the date! Spooktacular IMC Hackathon 📅 Oct 31, 2025 · ⏰ 1–8 PM CT 📍 Discovery Building, Madison, WI 🤝 Partners: Internet Society, IIJ, M-Lab, IODA, Cloudflare, OONI & Sorbonne 🛠️ Open to IMC attendees/hosts. Agenda soon. #IMC2025 #Hackathon #InternetMeasurement

Digital certificates underpin Web security and certificate transparency brings visibility into the millions of certificates issued daily. Our new Certificate Transparency page shares a wealth of data on certificates, CAs, CT logs, and more. radar.cloudflare.com/certificate-... #MerkleTown

AI bots generally crawl for training, search indexing, or in response to a user action. @radar.cloudflare.com now provides a "crawl purpose" perspective on AI bot traffic trends -- see more at radar.cloudflare.com/ai-insights#...

The latest series of partial #Internet shutdowns in #Syria, intended to prevent cheating on high school exams, finished today. These shutdowns targeted mobile providers, limiting the impact. radar.cloudflare.com/traffic/sy?d...

A M8.8 #earthquake at 23:40 UTC off the Kamchatka Peninsula in #Russia resulted in a ~50% drop in Internet traffic from the region. #Tsunami warnings have been issued for Japan, Alaska, Hawaii, Guam, and other Russian regions. www.reuters.com/business/env... x.com/USGS_Quakes/...

My latest post for the @cloudflare.social blog, looking at #Internet disruptions during the second quarter, as seen through @radar.cloudflare.com

Amidst violent clashes between Druze and Bedouins, there are reports of a government ordered #shutdown of the #Internet in As Suwayda' #Syria. IODA shows a loss of connectivity since July 14. #keepiton Follow connectivity in As Suwayda' in near realtime: ioda.inetintel.cc.gatech.edu/asn/29256-39...

The latest round of #Internet shutdowns in #Syria to prevent cheating on exams concluded this morning. In contrast to previous years, only cellular connectivity was shut off this year. The next round, for high school exams, will occur July 13 - August 3. radar.cloudflare.com/traffic/sy?d...

A fire at the historic #Ramses telecom building in Cairo Caused an #Internet disruption seen across multiple network providers. The impact began around 14:40 UTC (17:40 local). radar.cloudflare.com/traffic/eg?d... x.com/AlArabiya_En...

A widespread #Internet disruption in #Sudan caused traffic to drop ~50-70% at a country level at 12:00 UTC (14:00 local), with complete outages observed at Sudatel, SDN Mobitel, and MTN Sudan. radar.cloudflare.com/traffic/sd?d... x.com/sudan_war/st...

IODA shows what looks to be a complete Internet outage in Iran, according to our Active Probing signal. Reports indicate Iran’s domestic Internet is cutoff from International connections. Follow connectivity in Iran: ioda.inetintel.cc.gatech.edu/country/IR?f...

Cloudflare Radar now shows how often a given AI model sends traffic to a site relative to how often it crawls that site. This helps site owners make decisions about which AI bots to allow or block. blog.cloudflare.com/ai-search-cr...

This is incredible data from @dbelson.com showing HTML requests from crawlers versus referrals from that platform. Very easy to see the cost of AI here. ClaudeBot: 70.9k requests : 1 referral (!!!) OpenAI: 1.6K : 1 Perplexity: 202.4 : 1 blog.cloudflare.com/ai-search-cr...

Thread:

#Iran is back online as of 05:00 UTC (8:30am local). Iran Telecom Minister: With conditions returning to normal, the state of communication access has reverted to its previous state. x.com/HashemiSatta...

#Internet traffic recovery in #Iran contiunues with the apparent restoration of mobile connectivity. Traffic on MTN Irancell and MCCI returned around 05:00 UTC (08:30 local) this morning. However, traffic volumes remain below pre-conflict levels. x.com/HashemiSatta...

#Internet traffic in #Iran began to recover around 02:00 UTC (05:30 local) this morning. However, traffic levels remain well below pre-shutdown and pre-conflict levels. radar.cloudflare.com/traffic/ir?d...

After initial disruptions a week ago, the current #Internet outage in #Iran has now been in place for two full days, with only the “National Information Network” remaining accessible. Follow the latest at radar.cloudflare.com/traffic/ir?d...

Customers of CenturyLink (Lumen) in the United States are reportedly experiencing a widespread service disruption. Traffic volumes dropped by over 50% around 21:45 UTC. Social media posts suggest that it may be DNS-related. radar.cloudflare.com/traffic/as20...

Near-total Internet blackout in #Iran is continuing into a second day. Iranian govt has confirmed it is intentional: "In order to prevent the enemy’s misuse, international Internet access has been temporarily restricted." t.me/khabaronline... (h/t @ammir.bsky.social)

Nearly 24 hours after #Internet connectivity was cut in the country, #Iran remains offline, with the last bits of traffic disappearing around 20:00 last evening. Follow the latest status at radar.cloudflare.com/traffic/ir?d...

According to Iran's Ministry of Communications, "International Internet access has been temporarily restricted to prevent enemy abuse" #Internet traffic in the country is currently 98% lower than the same time a week ago. radar.cloudflare.com/traffic/ir?d... t.me/khabaronline...

NEW: The internet has collapsed in Iran on Wednesday, with one web monitoring firm saying the country is “now in the midst of a near-total national internet blackout.” “We can only see that the traffic dropped — the data doesn’t tell us why it dropped,” said CloudFlare's David Belson.

Iran is experiencing a near Internet blackout today, starting at ~5:00 PM local time. We see significant drops across networks. Some networks, including MCCI and Rightel appear to be responsive. Follow connectivity in Iran in near realtime: ioda.inetintel.cc.gatech.edu/country/IR?f...

At approximately 13:50 UTC, Internet traffic from Iran fell by approximately 75% amid reports that Internet connectivity had been cut nationwide. Follow the latest status at radar.cloudflare.com/traffic/ir?d... x.com/Ammir/status...

Expanding our internationalization to 14 languages, Cloudflare Radar is now available in Russian and Polish. Cloudflare Radar теперь доступен на русском и польском языках. Cloudflare Radar jest teraz dostępny w języku rosyjskim i polskim. radar.cloudflare.com

After a first round of exam-related #Internet shutdowns in late May, the second round started on Saturday, June 14. Intended to prevent cheating, the shutdowns occur 06:00-08:00 local (03:00-05:00 UTC). They are expected to run through July 3. radar.cloudflare.com/traffic/iq

Moment of Gratitude: CloudFlare CloudFlare saved the Internet Archive servers from a DDOS yesterday. Max rate of this DDOS attack was 525 Gbps (44.93 Mpps) of a "TCP flood" @archive.org does not have enough bandwidth to fend off that kind of attack = wouldbe bad saturday. Thank you #CloudFlare

Following Israel's attack on #Iran, #Internet access has been disrupted across multiple network providers. Just after 07:00 UTC (10:30 local), traffic from the country dropped by nearly 60%. Follow the latest status at radar.cloudflare.com/traffic/ir?d...

Take a listen to our latest guest appearance on Telemetry Now where we go under the hood of IODA with Doug Madory (@eldomador.bsky.social), Amanda Meng, Zachary Bischof. ioda.inetintel.cc.gatech.edu/reports/why-...

Two instances of damage to its fiber optic infrastructure has caused a complete #Internet outage at Digicel Haiti as of 17:00 local time (21:00 UTC). Follow status at radar.cloudflare.com/traffic/as27... x.com/jpbrun30/sta...