The loopback address is an assigned IP (Internet Protocol) number of 127.0.0.1, which is designated and reserved for the software portion of a network interface. The loopback address is not physically connected to the network and has no actual hardware assigned to it. It is primarily used by network administrators to test the functionality of a network device. This is done by “pinging” the loopback address to see if it responds. If you cannot “ping” your loopback address, no other network traffic will work either.
