IP Address Shortage

A private IP address is your own computer

Each internet device, except those build for special purposes, have an IP address This IP address is not visible from outside, as it is routed to the loopback interface of the device. The IP address is known also as localhost or localhost.localdomain. It is however possible for someone to send IP packets with source address and they still to be routed to your computer. Your computer will not send back packets to the originator, as they will be routed to the loopback interface.

In binary form it is 01111111000000000000000000000001 or 0b01111111000000000000000000000001.

In hexadecimal format it is 7F000001 or 0x7F000001.

As the netmask of those networks is usually 8 bits, the address is written also as or All IP addresses starting with 127, ranging from to are routed to the loopback interface.

# ping -c1

PING ( 56(84) bytes of data.

64 bytes from icmp_req=1 ttl=60 time=0.230 ms

--- ping statistics ---

1 packets transmitted, 1 received, 0% packet loss, time 0ms

rtt min/avg/max/mdev = 0.230/0.230/0.230/0.000 ms

# traceroute -n

traceroute to (, 3 hops max, 60 byte packets

1 0.229 ms 0.143 ms 0.121 ms



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