However, one special range of addresses is set aside forloopbackfunctionality. This is the range 127.0.0.0 to 127.255.255.255. IP datagrams sent by a host to a 127.x.x.x loopback address are not passed down to the data link layer for transmission. Instead, they “loop back” to the ...
The Internet community originally defined address classes to systematically assign address prefixes to networks of varying sizes. The class of address defined how many bits were used for the address prefix of a single subnet and how many bits were used for the host ID. Address classes also define...
The designers of the IP address scheme said that the first bit of the first byte in a Class A network address must always be off, or 0. This means a Class A address must be between 0 and 126 (127 is reserved for loopback address). In a Class B network, the ...
[SPE2-Tunnel0/0/1]ip address unnumbered interface loopback 1[SPE2-Tunnel0/0/1]tunnel-protocol mpls te[SPE2-Tunnel0/0/1]destination 1.1.1.1[SPE2-Tunnel0/0/1]mpls te tunnel-id 200[SPE2-Tunnel0/0/1]mpls te signal-protocol rsvp-te[SPE2-Tunnel0/0/1]mpls te reserved-for-binding[...
Address block (CIDR)RangeNumber of addressesScopePurpose ::/128 :: 1 Software Unspecified address ::1/128 ::1 1 Host Loopback address to the local host. ::ffff:0:0/96 ::ffff:0.0.0.0 –::ffff:255.255.255.255 232 Software IPv4 mapped addresses 100::/64 100:: –100::ffff:ffff:ffff...
Address rangeScopeDescription 10.0.0.0–10.255.255.255Private networkUsed for local communications within a private network 127.0.0.0–127.255.255.255HostUsed for loopback addresses 172.16.0.0–172.31.255.255Private networkUsed for local communications within a private network ...
As for why "ONLY" 127 - well 127.0.0.0/8 gives you more addresses than you'll ever need on a single device - usually you only need one, and that is usually 127.0.0.1. But you could use 127.2.2.2 if you want (go ahead - ping 127.2.2.2 on your PC and you will ...
Loopback address: is 0:0:0:0:0:0:0:1 or ::1 and not assigned to any interface. Similar to the IPv4 loopback address 127.0.0.1, the IPv6 loopback address indicates that a node sends IPv6 packets to itself. Unspecified address (::): can neither be assigned to any node nor functio...
Although IP stands for Internet Protocol, it's a communications protocol used from the smallest private network to the massive global Internet. An IP address is a unique identifier given to a single device on an IP network. The IP address consists of a 32-bit number that ranges from 0 to...
Unicast loopback address The IPv6 unicast loopback address is equivalent to the IPv4 loopback address, 127.0.0.1. The IPv6 loopback address is 0:0:0:0:0:0:0:1, or ::1. Unicast 6to4 addresses (2002::/16) IPv6 uses 6to4 addresses to communicate between two IPv6/IPv4 nodes over the...