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 Decimal | Hexadecimal | 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 |