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Netmask conversions (bitmask / cidr / hex / binary)

If you have ever needed to know what a netmask looks like expressed in some other format this table of equivalents should help. It contains common IPv4 netmasks expressed in four different formats.

Bitmask (Bits)Dotted DecimalHexadecimalBinary
/00.0.0.00x0000000000000000 00000000 00000000 00000000
/1128.0.0.00x8000000010000000 00000000 00000000 00000000
/2192.0.0.00xc000000011000000 00000000 00000000 00000000
/3224.0.0.00xe000000011100000 00000000 00000000 00000000
/4240.0.0.00xf000000011110000 00000000 00000000 00000000
/5248.0.0.00xf800000011111000 00000000 00000000 00000000
/6252.0.0.00xfc00000011111100 00000000 00000000 00000000
/7254.0.0.00xfe00000011111110 00000000 00000000 00000000
/8255.0.0.00xff00000011111111 00000000 00000000 00000000
/9255.128.0.00xff80000011111111 10000000 00000000 00000000
/10255.192.0.00xffc0000011111111 11000000 00000000 00000000
/11255.224.0.00xffe0000011111111 11100000 00000000 00000000
/12255.240.0.00xfff0000011111111 11110000 00000000 00000000
/13255.248.0.00xfff8000011111111 11111000 00000000 00000000
/14255.252.0.00xfffc000011111111 11111100 00000000 00000000
/15255.254.0.00xfffe000011111111 11111110 00000000 00000000
/16255.255.0.00xffff000011111111 11111111 00000000 00000000
/17255.255.128.00xffff800011111111 11111111 10000000 00000000
/18255.255.192.00xffffc00011111111 11111111 11000000 00000000
/19255.255.224.00xffffe00011111111 11111111 11100000 00000000
/20255.255.240.00xfffff00011111111 11111111 11110000 00000000
/21255.255.248.00xfffff80011111111 11111111 11111000 00000000
/22255.255.252.00xfffffc0011111111 11111111 11111100 00000000
/23255.255.254.00xfffffe0011111111 11111111 11111110 00000000
/24255.255.255.00xffffff0011111111 11111111 11111111 00000000
/25255.255.255.1280xffffff8011111111 11111111 11111111 10000000
/26255.255.255.1920xffffffc011111111 11111111 11111111 11000000
/27255.255.255.2240xffffffe011111111 11111111 11111111 11100000
/28255.255.255.2400xfffffff011111111 11111111 11111111 11110000
/29255.255.255.2480xfffffff811111111 11111111 11111111 11111000
/30255.255.255.2520xfffffffc11111111 11111111 11111111 11111100
/31255.255.255.2540xfffffffe11111111 11111111 11111111 11111110
/32255.255.255.2550xffffffff11111111 11111111 11111111 11111111

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