alt Hacker Newsmy tmobile 5g modem has ipv4 but changes ip every single page load, it's wild
I'm used to cablemodems with static ipv4 for months basically until mac changes
Replies
hylaride • last Saturday at 9:25 PM
> my tmobile 5g modem has ipv4 but changes ip every single page load, it's wild
They're probably using CG-NAT, though IP changes that often is a bit aggressive.
➕ show 1 reply
immibis • yesterday at 12:07 AM
Your IPv4 packets are getting tunneled to a CGNAT server which has an IP address pool.
Your website will load faster on cellphones if it supports IPv6. This is because the packets take more direct routes (because they don't go to the central CGNAT server) and because less processing is applied to them. Almost all mobile networks are now IPv6-only, with IPv4 traffic tunneled and CGNATted. Apparently T-Mobile is the rare exception.
Is it per chance 100.64.0.0/10?
* https://en.wikipedia.org/wiki/IPv4_shared_address_space