4chan image and thumbnail servers have had some issues for a long time now.
They seem to work but haven't been set up properly for the detection scripts.
This happened at the time where they added IPv6 support to the two domains.
If you are here for the 4chan filter extension, click here
Name
IP addresses
Status
Version 2020-09-05-01
[Source Code]
Tests are performed from 46.140.111.92