At minimum, this inconsistency between different properties is counter-intuitive. Moreover, ::ffff:127.0.0.0/104 is for all intents and purposes a loopback address, and should be treated as such. For ...

The IP address 127.0.0.1, commonly referred to as the localhost or loopback address, serves a unique purpose in networking. It allows a computer to reference itself rather than communicate with other ...

Unix sysadmins routinely use the “ifconfig -a” command to list network parameters associated with their systems. In particular, they use this command to determine the IP address, netmask and broadcast ...

Yesterday, I noticed some really strange traffic coming from our mailserver. It was trying to connect to a loopback address (in the IANA space assigned for them, 127.0.0.0/8) on port 25. <BR><BR>I ...

We just saw that the mask determines where the boundary between the network and host portions of the IP address lies. This boundary is important: If it is set too far to the right, there are lots of ...

Work is afoot to free up several internet protocol version 4 (IPv4) address ranges which have been unroutable as reserved, invalid or used for loopback networks since the 1980s. Seth Schoen, who ...

If you are using Internet or almost any computer network you will likely using IPv4 packets. IPv4 uses 32-bit source and destination address fields. We are actually running out of addresses but have ...