458 Appendix D Subnet mask conversion from CIDR to dotted decimal format
In the example of /20 previously given, the remainder is 4. In Tab le
87 "CIDR format remainders" (page 458), a remainder of 4 is equal
to a binary value of 1111 0000 and the dotted decimal format value
of the next and last field is 240. The first 3 fields of the subnet mask
are 255.255.240.
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 8 7
CIDR format remainders
Remainder of CIDR
format value divided
by 8 Binary value Dotted decimal value
1 1000 0000 128
2 1100 0000 192
3 1110 0000 224
4 1111 0000 240
51111 1000 248
6 1111 1100 252
71111 1110 254
—End—
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