Netmask Table

Bits  Dotted Decimal     Hexadecimal   Binary Netmask Netmask           Netmask

/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