Loopback-address meaning

An address that sends outgoing signals back to the same computer for testing. In a TCP/IP network, the loopback IP address is 127.0.0.1, and pinging this address will always return a reply unless the firewall prevents it. The loopback address allows a network administrator to treat the local machine as if it were a remote machine. See ping, loopback plug and localhost.
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In Internet Protocol (IP), a type of unicast address used when a host needs to send a packet back to itself for test purposes. See also host, IPv6, packet, unicast, and unicast address.
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