#開頭為0可省略，一組為零或多組為零可省略以::代替，但只能出現一次『::』 2001:0DB8:02de:0000:0000:0000:0000:0e13 = 2001:DB8:2de::e13 or 2001:db8:2ed:0:0:0:0:e13 2001:0DB8:0000:0000:0000:0000:1428:57ab = 2001:DB8::1428:57ab or 2001:0DB8::1428:57ab fe80:0000:0000:0000:0219:dbff:fe3f:ea98 = fe80::219:dbff:fe3f:ea98 or fe80::0219:dbff:fe3f:ea98 21DA:00D3:0000:2F3B:02AA:00FF:FE28:9C5A = 21DA:D3:0:2F3B:2AA:FF:FE28:9C5A #復原 fe80::205:5dff:fe12:36fb = fe80:0:0:0205:5dff:fe12:36fb or fe80:0000:0000:0000:0205:5dff:fe12:36fb 3ffe:501:ffff:100:205:5dff:fe12:36fb = 3fee:0501:ffff:0100:0205:5dff:fe12:36fb #錯誤的IPv6位址，因為有一組以上的『::』出現 2001::25de::cade
參考資料：
http://zh.wikipedia.org/wiki/IPv6
http://www.tcrc.edu.tw/data2/seminar99/ipv611.pdf