Table 10-1. Netmask Notation Translation Table For One Octet; Table 10-2. Netmask Formats - NETGEAR RT311 Reference Manual

Reference Guide for the Model RT311 and RT314 Internet Access Gateway Routers
Table 10-1 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 with subnet mask
255.255.255.0 into 16 subnets (4 bits), the new subnet mask becomes 255.255.255.240.
Table 10-1. Netmask Notation Translation Table for One Octet
Number of Bits
1
2
3
4
5
6
7
8
Table 10-2 displays several common netmask values in both the dotted-decimal and the
masklength formats.
Table 10-2. Netmask Formats
Dotted-Decimal
255.0.0.0
255.255.0.0
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252
255.255.255.254
255.255.255.255
10-6
Dotted-Decimal Value
128
192
224
240
248
252
254
255
Masklength
/8
/16
/24
/25
/26
/27
/28
/29
/30
/31
/32
Networks and Routing Basics