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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)10.3.72.128/26
network10.3.72.128/26
broadcast10.3.72.191
first host10.3.72.129
last host10.3.72.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.72.128/26
address00001010.00000011.01001000.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.01001000.10000000
broadcast00001010.00000011.01001000.10111111
green = network part, grey = host part
hex0x0a034880
decimal167987328
reverse dns128.72.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4880

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.72.128/3210.3.72.128 – 10.3.72.12810.3.72.128
210.3.72.129/3210.3.72.129 – 10.3.72.12910.3.72.129
310.3.72.130/3210.3.72.130 – 10.3.72.13010.3.72.130
410.3.72.131/3210.3.72.131 – 10.3.72.13110.3.72.131
510.3.72.132/3210.3.72.132 – 10.3.72.13210.3.72.132
610.3.72.133/3210.3.72.133 – 10.3.72.13310.3.72.133
710.3.72.134/3210.3.72.134 – 10.3.72.13410.3.72.134
810.3.72.135/3210.3.72.135 – 10.3.72.13510.3.72.135
910.3.72.136/3210.3.72.136 – 10.3.72.13610.3.72.136
1010.3.72.137/3210.3.72.137 – 10.3.72.13710.3.72.137
1110.3.72.138/3210.3.72.138 – 10.3.72.13810.3.72.138
1210.3.72.139/3210.3.72.139 – 10.3.72.13910.3.72.139
1310.3.72.140/3210.3.72.140 – 10.3.72.14010.3.72.140
1410.3.72.141/3210.3.72.141 – 10.3.72.14110.3.72.141
1510.3.72.142/3210.3.72.142 – 10.3.72.14210.3.72.142
1610.3.72.143/3210.3.72.143 – 10.3.72.14310.3.72.143
1710.3.72.144/3210.3.72.144 – 10.3.72.14410.3.72.144
1810.3.72.145/3210.3.72.145 – 10.3.72.14510.3.72.145
1910.3.72.146/3210.3.72.146 – 10.3.72.14610.3.72.146
2010.3.72.147/3210.3.72.147 – 10.3.72.14710.3.72.147
2110.3.72.148/3210.3.72.148 – 10.3.72.14810.3.72.148
2210.3.72.149/3210.3.72.149 – 10.3.72.14910.3.72.149
2310.3.72.150/3210.3.72.150 – 10.3.72.15010.3.72.150
2410.3.72.151/3210.3.72.151 – 10.3.72.15110.3.72.151
2510.3.72.152/3210.3.72.152 – 10.3.72.15210.3.72.152
2610.3.72.153/3210.3.72.153 – 10.3.72.15310.3.72.153
2710.3.72.154/3210.3.72.154 – 10.3.72.15410.3.72.154
2810.3.72.155/3210.3.72.155 – 10.3.72.15510.3.72.155
2910.3.72.156/3210.3.72.156 – 10.3.72.15610.3.72.156
3010.3.72.157/3210.3.72.157 – 10.3.72.15710.3.72.157
3110.3.72.158/3210.3.72.158 – 10.3.72.15810.3.72.158
3210.3.72.159/3210.3.72.159 – 10.3.72.15910.3.72.159
3310.3.72.160/3210.3.72.160 – 10.3.72.16010.3.72.160
3410.3.72.161/3210.3.72.161 – 10.3.72.16110.3.72.161
3510.3.72.162/3210.3.72.162 – 10.3.72.16210.3.72.162
3610.3.72.163/3210.3.72.163 – 10.3.72.16310.3.72.163
3710.3.72.164/3210.3.72.164 – 10.3.72.16410.3.72.164
3810.3.72.165/3210.3.72.165 – 10.3.72.16510.3.72.165
3910.3.72.166/3210.3.72.166 – 10.3.72.16610.3.72.166
4010.3.72.167/3210.3.72.167 – 10.3.72.16710.3.72.167
4110.3.72.168/3210.3.72.168 – 10.3.72.16810.3.72.168
4210.3.72.169/3210.3.72.169 – 10.3.72.16910.3.72.169
4310.3.72.170/3210.3.72.170 – 10.3.72.17010.3.72.170
4410.3.72.171/3210.3.72.171 – 10.3.72.17110.3.72.171
4510.3.72.172/3210.3.72.172 – 10.3.72.17210.3.72.172
4610.3.72.173/3210.3.72.173 – 10.3.72.17310.3.72.173
4710.3.72.174/3210.3.72.174 – 10.3.72.17410.3.72.174
4810.3.72.175/3210.3.72.175 – 10.3.72.17510.3.72.175
4910.3.72.176/3210.3.72.176 – 10.3.72.17610.3.72.176
5010.3.72.177/3210.3.72.177 – 10.3.72.17710.3.72.177
5110.3.72.178/3210.3.72.178 – 10.3.72.17810.3.72.178
5210.3.72.179/3210.3.72.179 – 10.3.72.17910.3.72.179
5310.3.72.180/3210.3.72.180 – 10.3.72.18010.3.72.180
5410.3.72.181/3210.3.72.181 – 10.3.72.18110.3.72.181
5510.3.72.182/3210.3.72.182 – 10.3.72.18210.3.72.182
5610.3.72.183/3210.3.72.183 – 10.3.72.18310.3.72.183
5710.3.72.184/3210.3.72.184 – 10.3.72.18410.3.72.184
5810.3.72.185/3210.3.72.185 – 10.3.72.18510.3.72.185
5910.3.72.186/3210.3.72.186 – 10.3.72.18610.3.72.186
6010.3.72.187/3210.3.72.187 – 10.3.72.18710.3.72.187
6110.3.72.188/3210.3.72.188 – 10.3.72.18810.3.72.188
6210.3.72.189/3210.3.72.189 – 10.3.72.18910.3.72.189
6310.3.72.190/3210.3.72.190 – 10.3.72.19010.3.72.190
6410.3.72.191/3210.3.72.191 – 10.3.72.19110.3.72.191
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 →