IPv6

IPv6 Toolkit

Expand an abbreviated address to its full form, compress it back down, and derive the EUI-64 interface identifier from a MAC address.

IPv6 address

Expanded (full)

2001:0db8:0000:0001:0000:0000:8a2e:0370

Compressed

2001:db8:0:1::8a2e:370

EUI-64 from MAC

MAC address

Interface ID (EUI-64)

021a:2bff:fe3c:4d5e

Link-local address

fe80::021a:2bff:fe3c:4d5e

The 7th bit of the first octet (U/L) is flipped and ff:fe is inserted in the middle, per RFC 4291.