olemus
mittemarsruuditav IP-aadress
= a non-routable IP meta-address

ülevaateid
https://stenzr.medium.com/understanding-0-0-0-0-vs-127-0-0-1-c6257ae35c62
https://en.wikipedia.org/wiki/0.0.0.0
https://en.wikipedia.org/wiki/Reserved_IP_addresses

standardid
https://tools.ietf.org/html/rfc5735