NETGEAR TA612V manual Netmask Notation Translation Table for One Octet

Reference Manual for the Broadband Voice Adapter TA612V

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

1128

2192

3224

4240

5248

6252

7254

8255

The following table displays several common netmask values in both the dotted-decimal and the masklength formats.

Table 7-2. 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

Configure all hosts on a LAN segment to use the same netmask for the following reasons:

B-6 Network and Routing Basics

202-10037-01, March 2005