[6to4.RU Project] Your 6to4 prefix is: 2002:266b:b3db::/48 | RFC | howto | 6to4reverse | address types | subnetting | netmasks coincidence | peering

Coincidence between masks IPv4 and IPv6 in 6to4 prefix 2002::/16

Sometimes it is necessary at the access list to allow addresses in the range 6to4, but in accordance with the networks IPv4. This table of coincidences will help you:

IPv4IPv6
prefixclassmaskprefix
/32 255.255.255.255/48
/31 255.255.255.254/47
/30 255.255.255.252/46
/29 255.255.255.248/45
/28 255.255.255.240/44
/27 255.255.255.224/43
/26 255.255.255.192/42
/25 255.255.255.128/41
/241C255.255.255.0/40
/232C255.255.254.0/39
/224C255.255.252.0/38
/218C255.255.248.0/37
/2016C255.255.240.0/36
/1932C255.255.224.0/35
/1864C255.255.192.0/34
/17128C255.255.128.0/33
/161B255.255.0.0/32
/152B255.254.0.0/31
/144B255.252.0.0/30
/138B255.248.0.0/29
/1216B255.240.0.0/28
/1132B255.224.0.0/27
/1064B255.192.0.0/26
/9128B255.128.0.0/25
/81A255.0.0.0/24
/72A254.0.0.0/23
/64A252.0.0.0/22
/58A248.0.0.0/21
/416A240.0.0.0/20
/332A224.0.0.0/19
/264A192.0.0.0/18
/1128A128.0.0.0/17
/0256A0.0.0.0/16

© 6to4.ru, 2012