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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)10.3.7.128/26
network10.3.7.128/26
broadcast10.3.7.191
first host10.3.7.129
last host10.3.7.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.7.128/26
address00001010.00000011.00000111.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.00000111.10000000
broadcast00001010.00000011.00000111.10111111
green = network part, grey = host part
hex0x0a030780
decimal167970688
reverse dns128.7.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:780

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.7.128/3210.3.7.128 – 10.3.7.12810.3.7.128
210.3.7.129/3210.3.7.129 – 10.3.7.12910.3.7.129
310.3.7.130/3210.3.7.130 – 10.3.7.13010.3.7.130
410.3.7.131/3210.3.7.131 – 10.3.7.13110.3.7.131
510.3.7.132/3210.3.7.132 – 10.3.7.13210.3.7.132
610.3.7.133/3210.3.7.133 – 10.3.7.13310.3.7.133
710.3.7.134/3210.3.7.134 – 10.3.7.13410.3.7.134
810.3.7.135/3210.3.7.135 – 10.3.7.13510.3.7.135
910.3.7.136/3210.3.7.136 – 10.3.7.13610.3.7.136
1010.3.7.137/3210.3.7.137 – 10.3.7.13710.3.7.137
1110.3.7.138/3210.3.7.138 – 10.3.7.13810.3.7.138
1210.3.7.139/3210.3.7.139 – 10.3.7.13910.3.7.139
1310.3.7.140/3210.3.7.140 – 10.3.7.14010.3.7.140
1410.3.7.141/3210.3.7.141 – 10.3.7.14110.3.7.141
1510.3.7.142/3210.3.7.142 – 10.3.7.14210.3.7.142
1610.3.7.143/3210.3.7.143 – 10.3.7.14310.3.7.143
1710.3.7.144/3210.3.7.144 – 10.3.7.14410.3.7.144
1810.3.7.145/3210.3.7.145 – 10.3.7.14510.3.7.145
1910.3.7.146/3210.3.7.146 – 10.3.7.14610.3.7.146
2010.3.7.147/3210.3.7.147 – 10.3.7.14710.3.7.147
2110.3.7.148/3210.3.7.148 – 10.3.7.14810.3.7.148
2210.3.7.149/3210.3.7.149 – 10.3.7.14910.3.7.149
2310.3.7.150/3210.3.7.150 – 10.3.7.15010.3.7.150
2410.3.7.151/3210.3.7.151 – 10.3.7.15110.3.7.151
2510.3.7.152/3210.3.7.152 – 10.3.7.15210.3.7.152
2610.3.7.153/3210.3.7.153 – 10.3.7.15310.3.7.153
2710.3.7.154/3210.3.7.154 – 10.3.7.15410.3.7.154
2810.3.7.155/3210.3.7.155 – 10.3.7.15510.3.7.155
2910.3.7.156/3210.3.7.156 – 10.3.7.15610.3.7.156
3010.3.7.157/3210.3.7.157 – 10.3.7.15710.3.7.157
3110.3.7.158/3210.3.7.158 – 10.3.7.15810.3.7.158
3210.3.7.159/3210.3.7.159 – 10.3.7.15910.3.7.159
3310.3.7.160/3210.3.7.160 – 10.3.7.16010.3.7.160
3410.3.7.161/3210.3.7.161 – 10.3.7.16110.3.7.161
3510.3.7.162/3210.3.7.162 – 10.3.7.16210.3.7.162
3610.3.7.163/3210.3.7.163 – 10.3.7.16310.3.7.163
3710.3.7.164/3210.3.7.164 – 10.3.7.16410.3.7.164
3810.3.7.165/3210.3.7.165 – 10.3.7.16510.3.7.165
3910.3.7.166/3210.3.7.166 – 10.3.7.16610.3.7.166
4010.3.7.167/3210.3.7.167 – 10.3.7.16710.3.7.167
4110.3.7.168/3210.3.7.168 – 10.3.7.16810.3.7.168
4210.3.7.169/3210.3.7.169 – 10.3.7.16910.3.7.169
4310.3.7.170/3210.3.7.170 – 10.3.7.17010.3.7.170
4410.3.7.171/3210.3.7.171 – 10.3.7.17110.3.7.171
4510.3.7.172/3210.3.7.172 – 10.3.7.17210.3.7.172
4610.3.7.173/3210.3.7.173 – 10.3.7.17310.3.7.173
4710.3.7.174/3210.3.7.174 – 10.3.7.17410.3.7.174
4810.3.7.175/3210.3.7.175 – 10.3.7.17510.3.7.175
4910.3.7.176/3210.3.7.176 – 10.3.7.17610.3.7.176
5010.3.7.177/3210.3.7.177 – 10.3.7.17710.3.7.177
5110.3.7.178/3210.3.7.178 – 10.3.7.17810.3.7.178
5210.3.7.179/3210.3.7.179 – 10.3.7.17910.3.7.179
5310.3.7.180/3210.3.7.180 – 10.3.7.18010.3.7.180
5410.3.7.181/3210.3.7.181 – 10.3.7.18110.3.7.181
5510.3.7.182/3210.3.7.182 – 10.3.7.18210.3.7.182
5610.3.7.183/3210.3.7.183 – 10.3.7.18310.3.7.183
5710.3.7.184/3210.3.7.184 – 10.3.7.18410.3.7.184
5810.3.7.185/3210.3.7.185 – 10.3.7.18510.3.7.185
5910.3.7.186/3210.3.7.186 – 10.3.7.18610.3.7.186
6010.3.7.187/3210.3.7.187 – 10.3.7.18710.3.7.187
6110.3.7.188/3210.3.7.188 – 10.3.7.18810.3.7.188
6210.3.7.189/3210.3.7.189 – 10.3.7.18910.3.7.189
6310.3.7.190/3210.3.7.190 – 10.3.7.19010.3.7.190
6410.3.7.191/3210.3.7.191 – 10.3.7.19110.3.7.191
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 →