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The length of an IPv6 address is 128 bits, compared to 32 bits in IPv4. Therefore the address space supports 2128 or approximately 3.4×1038 addresses. This means that many more devices can be connected directly to the Internet.

A typical IPv6 address would be represented like this:

fe80:0000:0000:0000:0202:b3ff:fe1e:8329

but there are rules for shortening the address such as removing leading zeros:

fe80:0:0:0:202:b3ff:fe1e:8329

or replacing consecutive groups of zeros with a double colon:

fe80::202:b3ff:fe1e:8329

IPv6 on Wikipedia

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