Netgear FVS318 FVS318 Reference Manual - Page 126

Table B-1., Netmask Notation Translation Table for One Octet, Netmask Formats

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Reference Manual for the Model FVS318 Broadband ProSafe VPN Firewall 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 B-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 The following table displays several common netmask values in both the dotted-decimal and the mask length formats. Table B-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 Masklength /8 /16 /24 /25 /26 /27 /28 /29 /30 B-6 Networks, Routing, and Firewall Basics M-10146-01

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Reference Manual for the Model FVS318 Broadband
ProSafe VPN Firewall
B-6
Networks, Routing, and Firewall Basics
M-10146-01
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.
The following table displays several common netmask values in both the dotted-decimal and the
mask length formats.
Table B-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 B-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