friday the 2nd of december, 2022
Turns out the
IETF
has assigned three subnets for the sole purpose of documentation.
RFC 5737
says:
The blocks 192.0.2.0/24 (TEST-NET-1), 198.51.100.0/24
(TEST-NET-2), and 203.0.113.0/24 (TEST-NET-3) are provided
for use in documentation.