Check your geofeed, free
A free resource for network operators. Paste your RFC 8805 geofeed URL to see what Fastah's crawl fetched, which rows it accepted, and whether your WHOIS/RDAP record declares the feed (RFC 9632).
Look up your feed
No feed yet? Publish one →
Three ways to check
Fastah's crawl →
Paste your feed URL above to open the crawl results Fastah publishes for it. No account needed.
tuning-geofeeds Skill ↗
An open-source AI Skill for Claude and Amp that checks your CSV, explains what to fix, and changes only what you approve.
Place search over MCP →
Check the country, region and city names in your rows against GeoNames places. Supports MCP 2026-07-28.
What the crawl results show
Fetch outcome
Whether the crawl fetched the file, and the HTTP status it got.
Row verdicts
How many rows fall inside a range whose registry record declares the feed, outside those ranges but registered to the same organization, or outside every declaring range.
RFC 9632 declaration
Whether the registry record covering each row names this feed, another feed, or none.
Published prefixes
The prefixes from your feed that appear in Fastah's public IP data.
Known feeds are re-crawled daily; newly declared feeds appear within 1–2 days. Facts from the crawl only: Fastah does not grade or endorse feeds.
Days for a newly published geofeed (RFC 8805, linked from WHOIS/RDAP per RFC 9632) to appear in a provider's data. Fastah ties for fastest of the 11 providers measured. Source: GeolocateMuch reactivity, an independent evaluator, as of 2026-10-31.
How fast your change shows up
GeolocateMuch publishes new geofeeds in registry records and counts the days until each provider's data reflects them. Fastah ties for fastest, at 1 day. Read why IP locations go wrong.
Talks and paper
- High-quality IP Geofeeds using AI Coding Assistants and MCPNANOG 96, San Francisco, February 2026 · Sid Mathur, FastahTalk page ↗ · Recording on YouTube ↗
- Authoring IP geofeeds using AI tools and MCPAPNIC 62 · Sid Mathur, FastahSlides (PDF) ↗ · APNIC blog write-up ↗
- Improvement ideas from an IP geolocation API providerPosition paper for the IAB IP geolocation workshop, October 2025 · Sid Mathur, FastahPaper (PDF) ↗
See us at APRICOT 2027
Fastah is a sponsor of APRICOT 2027 in Hong Kong, 24 February to 4 March 2027. Booth details coming soon. Bring your geofeed URL, or a prefix that lands in the wrong place.