IP Loopback Address 127.0.0.1

IP Loopback Address 127.0.0.1

IP Loopback Address 127.0.0.1

 
127.0.0.1 is the loopback address in IP.
  • 127.0.0.1
  • To test self connectivity
  • PING 127.0.0.1
  • Loop back packets are not visible on the network
Messages sent to 127.0.0.1 do not appear in the network. The network adpter loopback(send back) all messages to the sending application. That is it is used when a program access a network service running on the same computer itself.That is loopback address is used to test the self connectivity.

Example: PING 127.0.0.1
A successful ping request to 127.0.0.1 verify that a computer's network interface card, it's drivers, and the operating system's TCP/IP implementation are operating perfectly.

IP address range from 127.0.0.0 through 127.255.255.255  are reserved for loopback purposes. This range of IP address cannot be assigned as host ip address on a network.

Modern operating systems implement TCP/IP consider  "localhost" as equivalent to 127.0.0.1