Private IP addresses
Addresses used inside networks
The private IPv4 ranges are 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. Different local networks can reuse them. They are not globally unique public internet destinations.
Your router and the public address
A home router commonly translates private IPv4 connections to a public address. An internet provider may also use shared address space, 100.64.0.0/10, for carrier-grade translation. That range is distinct from the three private ranges.
IPv6 has local ranges too
IPv6 unique local addresses use fc00::/7, and link-local addresses use fe80::/10. Loopback addresses, including IPv4 127.0.0.1 and IPv6 ::1, refer to the local host. A public website cannot discover all of your local interfaces from one HTTP request.
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