Are you looking for an API for geolocating IP addresses? If yes, here are the top five APIs to choose from:    

1. IP Geolocation API by WhoisXMLAPI 

This API offers an IP geolocation lookup tool that helps you to search locations of users from various cities. Additionally, it allows you to personalize currencies on e-commerce platforms. It can also assist you to compare known client data with visitor IP geolocation to detect identity theft and online fraud.  

2. Telize 

Telize provides a REST API that lets you get the IP address of a visitor and query the location data from any IP address. Telize outputs IP geolocation data that is JSON-encoded while supporting JSONP and Cross-origin resource sharing (CORS).  

3. Freegeoip 

With Freegeoip, software developers can search IP addresses’ geolocation through the provision of a public HTTP API. It uses an IP address database with IP addresses that are linked to cities together with other significant information such as longitude, latitude, and time zone. By default, freegeoip allows up to 15,000 queries per sixty minutes. After reaching of the limit, every other request will lead to HTTP 403, forbidden, until the clearance of your quota. This freegeoip web server is open source and free. Hence, in case the public service limit is an issue for you, set it up and run your own instance.  

4. Nekudo 

Nekudo is a REST API that is open-source and allows you to get location data for IP addresses. Every response is JSON encoded string by default. When directly used in javascript, you can get JSONP responses. You can also access this service through https. Additionally, Nekudo follows a policy of fair use. By default, the service lacks limits, but your IP may be blocked if you abuse it.  

5. Neutrino 

Through Neutrino, you can take an address string and try to match it with real-world locations and come up with geographical coordinates in latitude and longitude. It offers phone validation, user-agent info, bad word filter, email validation, HTML extraction, code highlight, and other features. Neutrino can also help with verification of postal addresses, finding postal codes, or getting a neatly formatted address ideal for shipping.  The procedure of taking a string and trying to match it with possible actual world locations is called address geocoding. After the location of an address or addresses, then the geographic coordinates can be retrieved as latitude and longitude. The ordering of the location results is done by most relevant to the initial search address. When over one location is found, Neutrino uses a method on the basis of the Levenshtein distance to come up with the order.    

Conclusion  

Choose the geolocating API that suits your needs. However, IP Geolocation API by WhoisXMLAPI is more beneficial than the rest due to its security applications, digital rights management and access blocking, and content personalization.