Apparently AI(at least ChatGPT) is quite bad at determining IPv6 prefixes currently. I've honestly found it quite helpful with some things, but this is not one of them. For example, these are some things it's claimed recently (GPT 5.1 and 5.2 models): "200::/7 covers all IPv6 global unicast addresses" and "First 12 bits fixed Bits 13–16 must be zero Therefore the first hextet must look like: xxxx xxxx 0000 Which in hex means: ? ? 0 0 So valid /12 prefixes are: 2000::/12 2100::/12 2200::/12" (these are valid /12 prefixes, but it was claiming(despite my many disputes) that 2a10::/12 was not a valid /12) Edit: Apparently ChatGPT is uniquely bad at this. I just asked three AIs the same question (only once), and here are snippets the responses: Q: "explain the prefix 2a10::/12 to me" ChatGPT 5.2: "What range does it cover? A /12 starting at 2a10 covers: 2a10:: → 2aff:ffff:ffff:ffff:ffff:ffff:ffff:ffff" Deepseek 3.2: " 2a10::/12 is a large block of public IPv6 addresses assigned by the RIPE NCC (Europe's Regional Internet Registry) to Cloudflare, one of the world's largest content delivery network and cybersecurity companies. Start of range: 2a10:0000:0000:0000:0000:0000:0000:0000 End of range: 2a1f:ffff:ffff:ffff:ffff:ffff:ffff:ffff" (This does claim it's only cloudflare's for some reason, but I've never trusted AIs with facts anyway) Gemini: "Start: 2a10:0000:0000:0000:0000:0000:0000:0000 End: 2a1f:ffff:ffff:ffff:ffff:ffff:ffff:ffff"