Netmask Table

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Table 3 - Subnet Masks for a Class C Network
Netmask ( Bits ) Netmask ( Dotted Decimal ) Netmask ( Hexadecimal ) Netmask ( Binary )
0 0.0.0.0 0x00000000 00000000 00000000 00000000 00000000
1 128.0.0.0 0x80000000 10000000 00000000 00000000 00000000
2 192.0.0.0 0xc0000000 11000000 00000000 00000000 00000000
3 224.0.0.0 0xe0000000 11100000 00000000 00000000 00000000
4 240.0.0.0 0xf0000000 11110000 00000000 00000000 00000000
5 248.0.0.0 0xf8000000 11111000 00000000 00000000 00000000
6 252.0.0.0 0xfc000000 11111100 00000000 00000000 00000000
7 254.0.0.0 0xfe000000 11111110 00000000 00000000 00000000
8 255.0.0.0 0xff000000 11111111 00000000 00000000 00000000
9 255.128.0.0 0xff800000 11111111 10000000 00000000 00000000
10 255.192.0.0 0xffc00000 11111111 11000000 00000000 00000000
11 255.224.0.0 0xffe00000 11111111 11100000 00000000 00000000
12 255.240.0.0 0xfff00000 11111111 11110000 00000000 00000000
13 255.248.0.0 0xfff80000 11111111 11111000 00000000 00000000
14 255.252.0.0 0xfffc0000 11111111 11111100 00000000 00000000
15 255.254.0.0 0xfffe0000 11111111 11111110 00000000 00000000
16 255.255.0.0 0xffff0000 11111111 11111111 00000000 00000000
17 255.255.128.0 0xffff8000 11111111 11111111 10000000 00000000
18 255.255.192.0 0xffffc000 11111111 11111111 11000000 00000000
19 255.255.224.0 0xffffe000 11111111 11111111 11100000 00000000
20 255.255.240.0 0xfffff000 11111111 11111111 11110000 00000000
21 255.255.248.0 0xfffff800 11111111 11111111 11111000 00000000
22 255.255.252.0 0xfffffc00 11111111 11111111 11111100 00000000
23 255.255.254.0 0xfffffe00 11111111 11111111 11111110 00000000
24 255.255.255.0 0xffffff00 11111111 11111111 11111111 00000000
25 255.255.255.128 0xffffff80 11111111 11111111 11111111 10000000
26 255.255.255.192 0xffffffc0 11111111 11111111 11111111 11000000
27 255.255.255.224 0xffffffe0 11111111 11111111 11111111 11100000
28 255.255.255.240 0xfffffff0 11111111 11111111 11111111 11110000
29 255.255.255.248 0xfffffff8 11111111 11111111 11111111 11111000
30 255.255.255.252 0xfffffffc 11111111 11111111 11111111 11111100
31 255.255.255.254 0xfffffffe 11111111 11111111 11111111 11111110
32 255.255.255.255 0xffffffff 11111111 11111111 11111111 11111111
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