Code

2 articles tagged “Code”.

6 Nov 2026 7 min read

Get a visitor's country from their IP address in Node.js, Python, PHP and Go

Looking up a country from an IP takes one HTTP request. Getting the right IP, handling IPv6 and private addresses, caching results and failing gracefully takes a little more. Working examples in four languages.

IP geolocation
Guides
Code

4 Nov 2026 6 min read

ASN lookup by IP: find the network, ISP and organization behind any address

The country tells you where an address is. The autonomous system number tells you whose network it is, and that is often the more useful question. How to look up ASNs by hand and in code, and what to do with them.

IP geolocation
Networks
Code

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One GET request: location, network and bot signals

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