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Localhost

localhost means this computer in computer networking. On most computers localhost resolves to the IP address ::1 in IPv6 and 127.0.0.1 in IPv4. The localhost is useful for programmers to test software independent of a network connection. Using the localhost bypasses the network card in a computer.

Loopback

The loopback function of localhost can be used to run a network service without needing a physical network card. It can also be used to not let a network access the service that the computer is connected to.

IPv4 network standards reserve the address block 127.0.0.0/8 for loopback.[1]

References

  1. Cotton, M.; Vegoda, L.; Haberman, B. (April 2013). Bonica, R. (ed.). "Special-Purpose IP Address Registries". doi:10.17487/rfc6890. {{cite journal}}: Cite journal requires |journal= (help)
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