NETGEAR RH328, Reference Manual

Page: 29 / 142

Reference Guide for the Model RT328 and Model RH348 ISDN Routers
Introduction 1-11
Table 1-1 lists the additional subnet mask bits in dotted-decimal notation. To use the table, write
down the original class netmask and replace the 0 value octets with the dotted-decimal value of the
additional subnet bits. For instance, to partition your Class C network 204.247.203.0 with subnet
mask 255.255.255.0 into 16 subnets (4 bits), the new subnet mask becomes 255.255.255.240.
Note: The number 192.68.135.127 is not assigned because it is the broadcast address
of the first subnet. And 192.68.135.128 is not assigned because it is the network address
of the second subnet.
Table 1-1. Netmask Notation Translation Table for One Octet
Number of Bits
Dotted-Decimal Value
1 128
2 192
3 224
4 240
5 248
6 252
7 254
8 255
Intro.fm Page 11 Tuesday, October 10, 2000 3:15 PM