Netgear RT311 RT314 Reference Manual - Page 112

Table 10-1, 255.255.0 into 16 subnets 4 bits, the new subnet mask becomes 255.255.255.240.

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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 Dotted-Decimal Value 128 192 224 240 248 252 254 255 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 Masklength /8 /16 /24 /25 /26 /27 /28 /29 /30 /31 /32 10-6 Networks and Routing Basics

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Reference Guide for the Model RT311 and RT314 Internet Access Gateway Routers
10-6
Networks and Routing Basics
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 10-2
displays several common netmask values in both the dotted-decimal and the
masklength formats.
Table 10-1.
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
Table 10-2.
Netmask Formats
Dotted-Decimal
Masklength
255.0.0.0
/8
255.255.0.0
/16
255.255.255.0
/24
255.255.255.128
/25
255.255.255.192
/26
255.255.255.224
/27
255.255.255.240
/28
255.255.255.248
/29
255.255.255.252
/30
255.255.255.254
/31
255.255.255.255
/32