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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.136.65.128/26
network10.136.65.128/26
broadcast10.136.65.191
first host10.136.65.129
last host10.136.65.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.136.65.128/26
address00001010.10001000.01000001.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10001000.01000001.10000000
broadcast00001010.10001000.01000001.10111111
green = network part, grey = host part
hex0x0a884180
decimal176701824
reverse dns128.65.136.10.in-addr.arpa
ipv4-mapped::ffff:a88:4180

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.136.65.128/3210.136.65.128 – 10.136.65.12810.136.65.128
210.136.65.129/3210.136.65.129 – 10.136.65.12910.136.65.129
310.136.65.130/3210.136.65.130 – 10.136.65.13010.136.65.130
410.136.65.131/3210.136.65.131 – 10.136.65.13110.136.65.131
510.136.65.132/3210.136.65.132 – 10.136.65.13210.136.65.132
610.136.65.133/3210.136.65.133 – 10.136.65.13310.136.65.133
710.136.65.134/3210.136.65.134 – 10.136.65.13410.136.65.134
810.136.65.135/3210.136.65.135 – 10.136.65.13510.136.65.135
910.136.65.136/3210.136.65.136 – 10.136.65.13610.136.65.136
1010.136.65.137/3210.136.65.137 – 10.136.65.13710.136.65.137
1110.136.65.138/3210.136.65.138 – 10.136.65.13810.136.65.138
1210.136.65.139/3210.136.65.139 – 10.136.65.13910.136.65.139
1310.136.65.140/3210.136.65.140 – 10.136.65.14010.136.65.140
1410.136.65.141/3210.136.65.141 – 10.136.65.14110.136.65.141
1510.136.65.142/3210.136.65.142 – 10.136.65.14210.136.65.142
1610.136.65.143/3210.136.65.143 – 10.136.65.14310.136.65.143
1710.136.65.144/3210.136.65.144 – 10.136.65.14410.136.65.144
1810.136.65.145/3210.136.65.145 – 10.136.65.14510.136.65.145
1910.136.65.146/3210.136.65.146 – 10.136.65.14610.136.65.146
2010.136.65.147/3210.136.65.147 – 10.136.65.14710.136.65.147
2110.136.65.148/3210.136.65.148 – 10.136.65.14810.136.65.148
2210.136.65.149/3210.136.65.149 – 10.136.65.14910.136.65.149
2310.136.65.150/3210.136.65.150 – 10.136.65.15010.136.65.150
2410.136.65.151/3210.136.65.151 – 10.136.65.15110.136.65.151
2510.136.65.152/3210.136.65.152 – 10.136.65.15210.136.65.152
2610.136.65.153/3210.136.65.153 – 10.136.65.15310.136.65.153
2710.136.65.154/3210.136.65.154 – 10.136.65.15410.136.65.154
2810.136.65.155/3210.136.65.155 – 10.136.65.15510.136.65.155
2910.136.65.156/3210.136.65.156 – 10.136.65.15610.136.65.156
3010.136.65.157/3210.136.65.157 – 10.136.65.15710.136.65.157
3110.136.65.158/3210.136.65.158 – 10.136.65.15810.136.65.158
3210.136.65.159/3210.136.65.159 – 10.136.65.15910.136.65.159
3310.136.65.160/3210.136.65.160 – 10.136.65.16010.136.65.160
3410.136.65.161/3210.136.65.161 – 10.136.65.16110.136.65.161
3510.136.65.162/3210.136.65.162 – 10.136.65.16210.136.65.162
3610.136.65.163/3210.136.65.163 – 10.136.65.16310.136.65.163
3710.136.65.164/3210.136.65.164 – 10.136.65.16410.136.65.164
3810.136.65.165/3210.136.65.165 – 10.136.65.16510.136.65.165
3910.136.65.166/3210.136.65.166 – 10.136.65.16610.136.65.166
4010.136.65.167/3210.136.65.167 – 10.136.65.16710.136.65.167
4110.136.65.168/3210.136.65.168 – 10.136.65.16810.136.65.168
4210.136.65.169/3210.136.65.169 – 10.136.65.16910.136.65.169
4310.136.65.170/3210.136.65.170 – 10.136.65.17010.136.65.170
4410.136.65.171/3210.136.65.171 – 10.136.65.17110.136.65.171
4510.136.65.172/3210.136.65.172 – 10.136.65.17210.136.65.172
4610.136.65.173/3210.136.65.173 – 10.136.65.17310.136.65.173
4710.136.65.174/3210.136.65.174 – 10.136.65.17410.136.65.174
4810.136.65.175/3210.136.65.175 – 10.136.65.17510.136.65.175
4910.136.65.176/3210.136.65.176 – 10.136.65.17610.136.65.176
5010.136.65.177/3210.136.65.177 – 10.136.65.17710.136.65.177
5110.136.65.178/3210.136.65.178 – 10.136.65.17810.136.65.178
5210.136.65.179/3210.136.65.179 – 10.136.65.17910.136.65.179
5310.136.65.180/3210.136.65.180 – 10.136.65.18010.136.65.180
5410.136.65.181/3210.136.65.181 – 10.136.65.18110.136.65.181
5510.136.65.182/3210.136.65.182 – 10.136.65.18210.136.65.182
5610.136.65.183/3210.136.65.183 – 10.136.65.18310.136.65.183
5710.136.65.184/3210.136.65.184 – 10.136.65.18410.136.65.184
5810.136.65.185/3210.136.65.185 – 10.136.65.18510.136.65.185
5910.136.65.186/3210.136.65.186 – 10.136.65.18610.136.65.186
6010.136.65.187/3210.136.65.187 – 10.136.65.18710.136.65.187
6110.136.65.188/3210.136.65.188 – 10.136.65.18810.136.65.188
6210.136.65.189/3210.136.65.189 – 10.136.65.18910.136.65.189
6310.136.65.190/3210.136.65.190 – 10.136.65.19010.136.65.190
6410.136.65.191/3210.136.65.191 – 10.136.65.19110.136.65.191
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →