Nortel Networks NN43001-563 - Manual (Page 456)

456 Appendix D Subnet mask conversion from CIDR to dotted decimal format
In the example of /20 previously given, the remainder is 4. In Table
87 "CIDR format remainders" (page 456) , 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.
3 If 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 87
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
5 1111 1000 248
6 1111 1100 252
7 1111 1110 254
—End—
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.