ipfind.io
Geographic location of an IP address or any domain name along with some other useful information
A simple IP Address API.
IPify API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
ipify API is a simple public IP address API, easy enough to integrate into any application in seconds.
Details from ipify.org.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Geographic location of an IP address or any domain name along with some other useful information
IP address, country and city
Check if any website is down, from two continents; live status, uptime history and TLS expiry
The IPify API is provided by ipify (ipify.org). ipify API is a simple public IP address API, easy enough to integrate into any application in seconds.
Yes. The IPify API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The IPify API requires no authentication, so you can start making requests without signing up.
CORS support for the IPify API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The IPify API is served over HTTPS, so it's safe to use in production.