Updated: 10/11/2017 by Computer Hope

A loopback may refer to any of the following:

Loopback1. When referring to a hardware device, loopback refers to a physical connection that loops either between two devices of the same type, or loops back to itself. Loopback devices are used to test a connection for link, data transmission capabilities or to verify if the connection works.

2. When referring to a network address, see localhost

Analog loopback, Digital loopback, Hardware terms, Network terms