Subnet Mask Cheat Sheet
See also RFC 1878.
Addresses Hosts
Netmask
Amount of a Class C
/30
255.255.255.252
1/64
/29
255.255.255.248
1/32
/28
16
14
255.255.255.240
1/16
/27
32
30
255.255.255.224
1/8
/26
64
62
255.255.255.192
1/4
/25
128
126
255.255.255.128
1/2
/24
256
254
255.255.255.0
/23
512
510
255.255.254.0
/22
1024
1022
255.255.252.0
/21
2048
2046
255.255.248.0
/20
4096
4094
255.255.240.0
16
/19
8192
8190
255.255.224.0
32
/18
16384
16382
255.255.192.0
64
/17
32768
32766
255.255.128.0
128
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/16
65536
65534
255.255.0.0
256
Guide to sub-class C blocks
/25 -- 2 Subnets -- 126 Hosts/Subnet
/30 -- 64 Subnets -- 2 Hosts/Subnet
Network # IP Range Broadcast
Network # IP Range Broadcast
.0
.1-.126
.127
.0
.1-.2
.3
.128
.129-.254 .255
.4
.5-.6
.7
.8
.9-.10
.11
/26 -- 4 Subnets -- 62 Hosts/Subnet
.12
.13-.14
.15
Network # IP Range Broadcast
.16
.17-.18
.19
.0
.1-.62
.63
.20
.21-.22
.23
.64
.65-.126
.127
.24
.25-.26
.27
.128
.129-.190 .191
.28
.29-.30
.31
.192
.193-.254 .255
.32
.33-.34
.35
.36
.37-.38
.39
.40
.41-.42
.43
Network # IP Range Broadcast
.44
.45-.46
.47
.0
.48
.49-.50
.51
/27 -- 8 Subnets -- 30 Hosts/Subnet
.1-.30
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.31
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.32
.33-.62
.63
.52
.53-.54
.55
.64
.65-.94
.95
.56
.57-.58
.59
.96
.97-.126
.127
.60
.61-.62
.63
.128
.129-.158 .159
.64
.65-.66
.67
.160
.161-.190 .191
.68
.69-.70
.71
.192
.193-.222 .223
.72
.73-.74
.75
.224
.225-.254 .255
.76
.77-.78
.79
.80
.81-.82
.83
.84
.85-.86
.87
Network # IP Range Broadcast
.88
.89-.90
.91
.0
.1-.14
.15
.92
.93-.94
.95
.16
.17-.30
.31
.96
.97-.98
.99
.32
.33-.46
.47
.100
.101-.102 .103
.48
.49-.62
.63
.104
.105-.106 .107
.64
.65-.78
.79
.108
.109-.110 .111
.80
.81-.94
.95
.112
.113-.114 .115
.96
.97-.110
.111
.116
.117-.118 .119
.112
.113-.126 .127
.120
.121-.122 .123
.128
.129-.142 .143
.124
.125-.126 .127
/28 -- 16 Subnets -- 14 Hosts/Subnet
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.144
.145-.158 .159
.128
.129-.130 .131
.160
.161-.174 .175
.132
.133-.134 .135
.176
.177-.190 .191
.136
.137-.138 .139
.192
.193-.206 .207
.140
.141-.142 .143
.208
.209-.222 .223
.144
.145-.146 .147
.224
.225-.238 .239
.148
.149-.150 .151
.240
.241-.254 .255
.152
.153-.154 .155
.156
.157-.158 .159
.160
.161-.162 .163
.164
.165-.166 .167
/29 -- 32 Subnets -- 6 Hosts/Subnet
Network # IP Range Broadcast
.0
.1-.6
.7
.168
.169-.170 .171
.8
.9-.14
.15
.172
.173-.174 .175
.16
.17-.22
.23
.176
.177-.178 .179
.24
.25-.30
.31
.180
.181-.182 .183
.32
.33-.38
.39
.184
.185-.186 .187
.40
.41-.46
.47
.188
.189-.190 .191
.48
.49-.54
.55
.192
.193-.194 .195
.56
.57-.62
.63
.196
.197-.198 .199
.64
.65-.70
.71
.200
.201-.202 .203
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.72
.73-.78
.79
.204
.205-.206 .207
.80
.81-.86
.87
.208
.209-.210 .211
.88
.89-.94
.95
.212
.213-.214 .215
.96
.97-.102
.103
.216
.217-.218 .219
.104
.105-.110 .111
.220
.221-.222 .223
.112
.113-.118 .119
.224
.225-.226 .227
.120
.121-.126 .127
.228
.229-.230 .231
.128
.129-.134 .135
.232
.233-.234 .235
.136
.137-.142 .143
.236
.237-.238 .239
.144
.145-.150 .151
.240
.241-.242 .243
.152
.153-.158 .159
.244
.245-.246 .247
.160
.161-.166 .167
.248
.249-.250 .251
.168
.169-.174 .175
.252
.253-.254 .255
.176
.177-.182 .183
.184
.185-.190 .191
.192
.193-.198 .199
.200
.201-.206 .207
.208
.209-.214 .215
.216
.217-.222 .223
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.224
.225-.230 .231
.232
.233-.238 .239
.240
.241-.246 .247
.248
.249-.254 .255
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