fly.io
Domduck has read fly.io on 111 days across 7 sources, since 22 June 2026. Its robots.txt blocks none of the 8 AI crawlers Domduck tracks.
Last checked .
100
What changed
111 days of readings- 3 September 2026 (2026-09-03)
- The certificate was renewed on 3 September 2026 and is valid to 1 December 2026.
- 21 August 2026 (2026-08-21)
- The catch-all Disallow was removed on 21 August 2026.
- robots.txt started returning HTTP 200 on 21 August 2026, from 404.
Domain Rating
90 daysA 0 to 100 score of how strong a domain’s backlink profile is, on a logarithmic scale, so the distance from 70 to 80 is far larger than from 10 to 20.
Popularity rank
90 days, lower is betterPosition in the Tranco list, a research ranking of the million most popular domains averaged over thirty days so a single day’s traffic spike cannot move it.
AI crawler policy
Serves llms.txtNo ChatGPT browsing or training
No ChatGPT search surface
No Claude retrieval
No Perplexity citation
Out of Gemini and AI Overviews grounding, Search ranking unaffected
Out of Apple Intelligence training
Out of most open training corpora
Out of TikTok and Doubao
Read from fly.io/robots.txt. “Not named” means the file says nothing about that agent, which is not the same as allowing it: a catch-all rule added later blocks it without anyone deciding to.
What the domain itself says
read directly, not from a vendor- Issuer
- Let's Encrypt
- Valid
- Yes
- Expires
- 2026-12-01
- Protocol
- TLSv1.3
- Names covered
- 1
- A records
- 1
- AAAA records
- 1
- Mail exchangers
- 5
- Nameservers
- ns1077.hosted.flydns.net, ns1970.hosted.flydns.net, ns479.hosted.flydns.net, ns967.hosted.flydns.net
- DMARC policy
- quarantine
How fly.io compares to other .io domains
Questions
- Does fly.io block GPTBot?
- No. fly.io's robots.txt does not disallow GPTBot, though it does not name the agent either.
- Does fly.io publish an llms.txt file?
- Yes. fly.io serves an llms.txt file.
- Who issues fly.io's certificate?
- Let's Encrypt.
How this page is made
Every number on this page is a measurement Domduck took itself or read from a public source, on a stated date. Nothing here is written by a language model. Where a value has not changed, no sentence is generated about it.
First reading . 7 sources, 111 days with at least one reading. The popularity rank comes from the Tranco list; the registration record from RDAP, which ICANN requires registries to publish. The certificate, the DNS records and the crawler policy are read by Domduck directly from fly.io.