NETGEAR WGR101 Reference Manual page 72

Reference Manual for the 54 Mbps Wireless Travel Router WGR101
The following table 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 example, 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 7-1. 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
The following table displays several common netmask values in both the dotted-decimal and the
masklength formats.
Table 7-2. 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
Configure all hosts on a LAN segment to use the same netmask for the following reasons:
B-6
Masklength
/8
/16
/24
/25
/26
/27
/28
/29
/30
/31
/32
February 2005 (202-10034-03)
Network Basics