AMPRnet / IP-Address Assignment
For Amateur Radio operators there is a Class A-Subnet reserved.
This IPv4 Network 44/8 is known as the AMPRNet, named from "AMateur Packet Radio Network".
The ampr.org domain is administered by Brian Kantor, WB6CYT. He delegated lower Levels of the name space to "local coordinators" (by geographical or political entities) who assign addresses to ham radio operators in their area.
If you need an address for e.g. IP over AX25 check the AMPRNet main website for general information and a list of local AMPRNet coordinators or/and have a look at your local Packet Radio BBS to search for your "local local coordinator".