API
All /ip* endpoints return the IP address of the
requesting client, as seen by fst.st. They're useful for testing
scripts, proxies, or network setups.
Endpoints
| Path | Format | Response |
|---|---|---|
/ip |
text/plain | Just the IP address as text. |
/ip.txt |
text/plain | identical to /ip. |
/ip.json |
application/json | The IP address as JSON. |
/ip.html |
text/html | The IP address in a minimal HTML document. |
An unknown file extension (e.g. /ip.xml) gets a
406 Not Acceptable response.
Rate limit
All /ip* endpoints are limited to
60 requests per 60 seconds per client IP (fixed
window). Exceeding the limit gets a 429 Too Many Requests
response with a Retry-After header (seconds until the
next window). Other endpoints such as /version.json or
/candidate-urls are not affected.