IP Lookup Using Free API

When someone sends you an email, or a message from your own website, you can usually get the IP address of the sender. Using this IP lookup tool, you can perform a simple information lookup to get the geolocation and ISP name of that IP address.

What this tool does

• You type in an IP address (or paste one). Hit Lookup.
• The tool checks public information about that address and shows you where it’s likely located (country, region, city) and who provides the internet connection (ISP).
• It’s fast and doesn’t reload the page — the result appears right under the form.

Why this is useful for you

This tool is great for quick spot-checks: you can see where visitors, customers, or suspicious logins are coming from. It also provides a simple way to verify whether a user’s claimed location matches their IP address. And when you don’t yet have analytics set up, it can give you fast, early marketing insight into where your traffic is coming from.

What’s used to build it

In the source code, the main index.html file is a bare HTML file without any styling (so you can style the tool yourself, adapt it to integrate into your website, etc.). The tool also uses JavaScript with jQuery to perform an asynchronous call to a server side script, sending over the entered IP address. A small PHP script on the server fetches the IP details from a public API (ip-api.com). The API is provided for free, without the need for an API key.

Limitations

The tool uses a public service to find IP information, so that service will see the IPs you check. The free version of the public service also has a usage limit (roughly 1,000 lookups per month). If you need more checks or want to avoid hitting limits, the tool can be extended with caching strategy or by getting a paid API plan.

Want it on your website?

If you’d like this tool added to your site, styled for your brand, or hooked into analytics, we can install and configure it for you. Just contact us for further information.