Page 358 of 378 Appendix C: Subnet mask conversion from CIDR to dotted decimal format
553-3001-202 Standard 1.00 April 2000
3If there are any remaining fields in the dotted decimal format, they have
a value of 0. The complete subnet mask in dotted decimal format is
255.255.240.0.
Table 70
CIDR format remainders
Remainder of CIDR
format value divided
by eight Binary value Dotted decimal value
1 1000 0000 128
2 1100 0000 192
3 1110 0000 224
4 1111 0000 240
5 1111 1000 248
6 1111 1100 252
7 1111 1110 254