Simon Willison’s Weblog

IPy. Handy Python module for manipulating IP addresses—use IP(ip_addr).iptype() == ’PUBLIC’ to check that an address isn’t in a private address range.

Posted 24th December 2007 at 1:19 pm

Recent articles

JustHTML is a fascinating example of vibe engineering in action - 14th December 2025
OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025

ip 4 ipaddresses 1 ipy 1 networking 22 python 1213 security 569

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe