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Subnetting Quick Reference

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Subnet Mask Quick Reference
Host Bit Length Math Max Hosts Subnet Mask Mask Octet Binary Mask Mask Length Subnet Length
0 2^0= 1 255.255.255.255 4 11111111 32 0
1 2^1= 2 255.255.255.254 4 11111110 31 1
2 2^2= 4 255.255.255.252 4 11111100 30 2
3 2^3= 8 255.255.255.248 4 11111000 29 3
4 2^4= 16 255.255.255.240 4 11110000 28 4
5 2^5= 32 255.255.255.224 4 11100000 27 5
6 2^6= 64 255.255.255.192 4 11000000 26 6
7 2^7= 128 255.255.255.128 4 10000000 25 7
8 2^8= 256 255.255.255.0 3 11111111 24 8
9 2^9= 512 255.255.254.0 3 11111110 23 9
10 2^10= 1024 255.255.252.0 3 11111100 22 10
11 2^11= 2048 255.255.248.0 3 11111000 21 11
12 2^12= 4096 255.255.240.0 3 11110000 20 12
13 2^13= 8192 255.255.224.0 3 11100000 19 13
14 2^14= 16384 255.255.192.0 3 11000000 18 14
15 2^15= 32768 255.255.128.0 3 10000000 17 15
16 2^16= 65536 255.255.0.0 2 11111111 16 16
17 2^17= 131072 255.254.0.0 2 11111110 15 17
18 2^18= 262144 255.252.0.0 2 11111100 14 18
19 2^19= 524288 255.248.0.0 2 11111000 13 19
20 2^20= 1048576 255.240.0.0 2 11110000 12 20
21 2^21= 2097152 255.224.0.0 2 11100000 11 21
22 2^22= 4194304 255.192.0.0 2 11000000 10 22
23 2^23= 8388608 255.128.0.0 2 10000000 9 23
24 2^24= 16777216 255.0.0.0 1 11111111 8 24