olemus
levinuim domeeninimele "localhost" vastav IP-aadress
standardsete mittemarsruuditavate silmustusaadresside vahemikust 127.0.0.0, ... , 127.255.255.254
= the loopback address and is used by a computer to refer to itself

ülevaateid
https://www.makeuseof.com/tag/what-is-127-0-0-1-localhost-loopback-address/
https://en.wikipedia.org/wiki/Localhost
https://medium.com/@aiman.asfia/understanding-the-difference-between-localhost-and-127-0-0-1-0c1f26107f87

standard
https://tools.ietf.org/html/rfc6761

vt ka
- 0.0.0.0