
Locate and identify website visitors by IP address.
IPstack API is a free Geocoding API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Accurate, real-time IP geolocation trusted by developers worldwide. Get country, city, and coordinates via a simple REST API. Free to start.
Details from ipstack.com.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
IP Geolocation API. Collecting data from multiple sources
The IPstack API is provided by IPstack (ipstack.com). Accurate, real-time IP geolocation trusted by developers worldwide. Get country, city, and coordinates via a simple REST API. Free to start.
Yes. The IPstack API is listed in the Geocoding 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.
Yes. The IPstack API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the IPstack API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The IPstack API is served over HTTPS, so it's safe to use in production.