bce0e00a_entifying_valid_IPv6_addresses__Comment
[Address] 21DA:D3:0:2F3B:2AA:FF:FE28:9C5A [Valid] Yes [Comment] 
Leading 0’s can be dropped from each quartet
IPv6 – Cheatsheet on identifying valid IPv6 addresses | Your Network Technology Information Site - IPv6 - Cheatsheet on identifying valid IPv6 addresses
Comment