Overview

The IP Cow REST API — base URL, JSON responses, and a first request.

Every IP Cow tool has a JSON endpoint under https://ipcow.com/api. Responses are JSON; most tools work without authentication.

Your first request

curl https://ipcow.com/api/whats-my-ip?raw

Most endpoints accept their input as query parameters and return a JSON object:

curl "https://ipcow.com/api/blacklist?ip=8.8.8.8"

When you need a key

You don’t need an account to call the API — anonymous callers are rate-limited by IP. Create an API key to tie usage to your account (and, on a paid plan, get a higher limit). See Rate limits.

Conventions

Method: GET for lookups (a few tools accept POST with a JSON body).
Format: application/json. Some tools support ?raw for plain text.
Errors: non-2xx responses carry { "error": "…" }.