What does the IPv6 address :: 1 128 mean?

What does :: mean in a IPv6 address?

Double colon. Specify IPv6 addresses by using double colons ( :: ) in place of a series of zeros. For example, IPv6 address ff06:0:0:0:0:0:0:c3 can be written as ff06::c3 . Double colons can be used only once in an IP address.

What type of address is represented by :: 1 128?

::1/128 is the loopback address of the local host which is the equivalent of the 127.0. 0.1 in IPv4. When an application in a specific host sends a data packet to this address, the TCIP/IP stack will loop the packet back on the same interface it was sent to so the packet never exits that host.

Is 128 a valid IPv6 address?

IPv6 uses 128-bit (2128) addresses, allowing 3.4 x 1038 unique IP addresses. This is equal to 340 trillion trillion trillion IP addresses. IPv6 is written in hexadecimal notation, separated into 8 groups of 16 bits by the colons, thus (8 x 16 = 128) bits in total.

Why IPv6 is a 128-bit address?

Basically, the 128-bit address space of IPv6 gives us such a massive address space that we are unlikely to ever use all of it (2^128 addresses, or 3.4*10^38). The larger address space also allows for a better hierarchical model of addressing, because CIDR and similar "hacks" are no longer necessary for routing.