Actually, neither this one nor cidr.xyz is fully compliant with the RFCs. Although I don't recommend it for pretty obvious reasons (and most routers probably won't handle it correctly, either), at least in the pre-CIDR RFCs, there is no requirement that subnet bits be contiguous. (I'm actually not sure if the CIDR RFC's address this - I don't keep up with this stuff anymore, and more recent RFC's my finally have discouraged these literally mindfcking netmasks...)
As for IPv6, yuck - it's the most brain-dead nomenclature ever written - if we'd tried* to make IP addresses as impossible to use and communicate as possible, this is wheat we'd do.
Comments
Actually, neither this one nor cidr.xyz is fully compliant with the RFCs. Although I don't recommend it for pretty obvious reasons (and most routers probably won't handle it correctly, either), at least in the pre-CIDR RFCs, there is no requirement that subnet bits be contiguous. (I'm actually not sure if the CIDR RFC's address this - I don't keep up with this stuff anymore, and more recent RFC's my finally have discouraged these literally mindfcking netmasks...)
As for IPv6, yuck - it's the most brain-dead nomenclature ever written - if we'd tried* to make IP addresses as impossible to use and communicate as possible, this is wheat we'd do.