ipgeolocation.io's IP API Stack provides country, city, state, province, time zone, current time, local currency, latitude and longitude, company detail, ISP, language, zip code, country calling code, threat intelligence and much more from any IPv4 and IPv6 address in JSON format with https support even in free GeoIP plan.
IP Geolocation API has introduced a new feature of Threat Intelligence that provides IP-Security information on all the paid subscriptions but doesn't respond it by default. IP Geolocation API Threat Intelligence provides information about istor, isproxy, proxytype, isanonymous, isknownattacker, iscloudprovider in its response.
Go to https://ipgeolocation.io/ and search "worldX.runescape.com", where X is the world. e.g world 1 should be world1.runescape.com, world 100 should be world100.runescape.com. - Source: Reddit / 3 days ago
IP-API.com - Free IP Geolocation API - lookup any IP address
ipstack - ipstack is a free, real-time IP address to location JSON API and database service supporting IPv4 and IPv6 lookup.
ipapi - Web analytics with IP address lookup and location API
IP2Location - IP2Location is a leading provider of IP intelligence service.
Ipregistry - Ipregistry is a fast, reliable IP geolocation and threat data API. People use Ipregistry to personalize content, analyze traffic, target ads, block countries but also to prevent abuse by detecting Proxy and Tor users, known spammers and bad bots.
TrueIP - TrueIP is a small program that runs in the system tray, monitoring your IP address(es).