ctfd.io
ctfd.io is a live website hosted on Cloudflare, Inc. (AS13335) in the United States, served by Cloudflare. cl0q first saw it on 2026-06-16 and last crawled it on 2026-07-07. It resolves to 104.21.19.74 and has mail (MX) records set up. Its favicon is fingerprinted by SHA-256, so you can find every other site that serves the same icon.
How the site describes itself:
CTFd : The Easiest Capture The Flag Platform
The best Capture The Flag framework out there for hiring hackers, training developers, and teaching students.
| Status | 200 OK — live & indexed by cl0q |
|---|---|
| First seen | 2026-06-16 |
| Last crawled | 2026-07-07 |
| IPv4 | 104.21.19.74 |
| IPv6 | 2606:4700:3030::ac43:b99f |
| Network | AS13335 Cloudflare, Inc. · United States |
| Mail (MX) | aspmx.l.google.com,alt1.aspmx.l.google.com,alt2.aspmx.l.google.com,alt3.aspmx.l.google.com,alt4.aspmx.l.google.com |
| Server | cloudflare |