https://datatracker.ietf.org/doc/html/rfc6996#section-5 https://datatracker.ietf.org/doc/html/rfc6996#section-5 - it's in the range reserved for private use, so

https://datatracker.ietf.org/doc/html/rfc6996#section-5 https://datatracker.ietf.org/doc/html/rfc6996#section-5 - it's in the range reserved for private use, so it's probably network internal to wherever the list is originally from?