
Another simple IP Address API.
IPinfo API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Welcome to our IPinfo developer resource - the quickest and easiest way to get started with IPinfo is to use one of our official libraries.
Details from ipinfo.io.

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
Check if any website is down, from two continents; live status, uptime history and TLS expiry
The IPinfo API is provided by IPinfo.io (ipinfo.io). Welcome to our IPinfo developer resource - the quickest and easiest way to get started with IPinfo is to use one of our official libraries.
Yes. The IPinfo 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 IPinfo API requires no authentication, so you can start making requests without signing up.
CORS support for the IPinfo API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The IPinfo API is served over HTTPS, so it's safe to use in production.