IPv6 prefix
2000::/3
- IPv6
- Global unicast
- /3
2000::/3 is an IPv6 prefix in the global unicast range: the publicly routable range. It covers 2^125 addresses, from 2000:: to 3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff.
Representations
Compressed (RFC 5952)2000::
Fully expanded2000:0000:0000:0000:0000:0000:0000:0000
In a URL[2000::]brackets separate the address from the port
Integer42535295865117307932921825928971026432
Hexadecimal0x20000000000000000000000000000000
Reverse DNS0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.ip6.arpaeach nibble becomes a label, least significant first
What kind of address
RangeGlobal unicastthe publicly routable range
Routable on the internetYes
Address familyIPv6128 bits, against 32 for IPv4
Groups2000, 0, 0, 0, 0, 0, 0, 0
Zero groups7runs of two or more are what "::" replaces
Prefix arithmetic
Prefix length/3
Network address2000::
Last address3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
Addresses in the block2^125more than the whole IPv4 internet, many times over
/64 subnets available2^61a /64 is the standard size for a single LAN
Host bits125
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