Private IP Definition
RFC 1918 10.0.0.0/255.0.0.0(8) 172.16.0.0/255.240.0.0(12) 192.168.0.0/255.255.0.0(16) RFC 6598 100.64.0.0/255.252.0.0 (10) ISP internal RFC 2544 192.18.0.0/255.127.0.0 for a testing device were to be accidentally connected to partt of the Internet RFC 5737 192.0.2.0/255.255.255.0 (24) 198.51.100.0/255.255.255.0 (24) 203.0.113.0/255.255.255.0 (24) References https://en.wikipedia.org/wiki/Private_network https://www.ietf.org/standards/rfcs/ https://www.rfc-editor.org/search/rfc_search.php https://tools.ietf.org/html/rfc1918 https://tools.ietf.org/html/rfc6598 https://tools.ietf.org/html/rfc2544 https://tools.ietf.org/html/rfc5737