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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)10.3.239.128/26
network10.3.239.128/26
broadcast10.3.239.191
first host10.3.239.129
last host10.3.239.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.239.128/26
address00001010.00000011.11101111.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.11101111.10000000
broadcast00001010.00000011.11101111.10111111
green = network part, grey = host part
hex0x0a03ef80
decimal168030080
reverse dns128.239.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:ef80

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.239.128/3210.3.239.128 – 10.3.239.12810.3.239.128
210.3.239.129/3210.3.239.129 – 10.3.239.12910.3.239.129
310.3.239.130/3210.3.239.130 – 10.3.239.13010.3.239.130
410.3.239.131/3210.3.239.131 – 10.3.239.13110.3.239.131
510.3.239.132/3210.3.239.132 – 10.3.239.13210.3.239.132
610.3.239.133/3210.3.239.133 – 10.3.239.13310.3.239.133
710.3.239.134/3210.3.239.134 – 10.3.239.13410.3.239.134
810.3.239.135/3210.3.239.135 – 10.3.239.13510.3.239.135
910.3.239.136/3210.3.239.136 – 10.3.239.13610.3.239.136
1010.3.239.137/3210.3.239.137 – 10.3.239.13710.3.239.137
1110.3.239.138/3210.3.239.138 – 10.3.239.13810.3.239.138
1210.3.239.139/3210.3.239.139 – 10.3.239.13910.3.239.139
1310.3.239.140/3210.3.239.140 – 10.3.239.14010.3.239.140
1410.3.239.141/3210.3.239.141 – 10.3.239.14110.3.239.141
1510.3.239.142/3210.3.239.142 – 10.3.239.14210.3.239.142
1610.3.239.143/3210.3.239.143 – 10.3.239.14310.3.239.143
1710.3.239.144/3210.3.239.144 – 10.3.239.14410.3.239.144
1810.3.239.145/3210.3.239.145 – 10.3.239.14510.3.239.145
1910.3.239.146/3210.3.239.146 – 10.3.239.14610.3.239.146
2010.3.239.147/3210.3.239.147 – 10.3.239.14710.3.239.147
2110.3.239.148/3210.3.239.148 – 10.3.239.14810.3.239.148
2210.3.239.149/3210.3.239.149 – 10.3.239.14910.3.239.149
2310.3.239.150/3210.3.239.150 – 10.3.239.15010.3.239.150
2410.3.239.151/3210.3.239.151 – 10.3.239.15110.3.239.151
2510.3.239.152/3210.3.239.152 – 10.3.239.15210.3.239.152
2610.3.239.153/3210.3.239.153 – 10.3.239.15310.3.239.153
2710.3.239.154/3210.3.239.154 – 10.3.239.15410.3.239.154
2810.3.239.155/3210.3.239.155 – 10.3.239.15510.3.239.155
2910.3.239.156/3210.3.239.156 – 10.3.239.15610.3.239.156
3010.3.239.157/3210.3.239.157 – 10.3.239.15710.3.239.157
3110.3.239.158/3210.3.239.158 – 10.3.239.15810.3.239.158
3210.3.239.159/3210.3.239.159 – 10.3.239.15910.3.239.159
3310.3.239.160/3210.3.239.160 – 10.3.239.16010.3.239.160
3410.3.239.161/3210.3.239.161 – 10.3.239.16110.3.239.161
3510.3.239.162/3210.3.239.162 – 10.3.239.16210.3.239.162
3610.3.239.163/3210.3.239.163 – 10.3.239.16310.3.239.163
3710.3.239.164/3210.3.239.164 – 10.3.239.16410.3.239.164
3810.3.239.165/3210.3.239.165 – 10.3.239.16510.3.239.165
3910.3.239.166/3210.3.239.166 – 10.3.239.16610.3.239.166
4010.3.239.167/3210.3.239.167 – 10.3.239.16710.3.239.167
4110.3.239.168/3210.3.239.168 – 10.3.239.16810.3.239.168
4210.3.239.169/3210.3.239.169 – 10.3.239.16910.3.239.169
4310.3.239.170/3210.3.239.170 – 10.3.239.17010.3.239.170
4410.3.239.171/3210.3.239.171 – 10.3.239.17110.3.239.171
4510.3.239.172/3210.3.239.172 – 10.3.239.17210.3.239.172
4610.3.239.173/3210.3.239.173 – 10.3.239.17310.3.239.173
4710.3.239.174/3210.3.239.174 – 10.3.239.17410.3.239.174
4810.3.239.175/3210.3.239.175 – 10.3.239.17510.3.239.175
4910.3.239.176/3210.3.239.176 – 10.3.239.17610.3.239.176
5010.3.239.177/3210.3.239.177 – 10.3.239.17710.3.239.177
5110.3.239.178/3210.3.239.178 – 10.3.239.17810.3.239.178
5210.3.239.179/3210.3.239.179 – 10.3.239.17910.3.239.179
5310.3.239.180/3210.3.239.180 – 10.3.239.18010.3.239.180
5410.3.239.181/3210.3.239.181 – 10.3.239.18110.3.239.181
5510.3.239.182/3210.3.239.182 – 10.3.239.18210.3.239.182
5610.3.239.183/3210.3.239.183 – 10.3.239.18310.3.239.183
5710.3.239.184/3210.3.239.184 – 10.3.239.18410.3.239.184
5810.3.239.185/3210.3.239.185 – 10.3.239.18510.3.239.185
5910.3.239.186/3210.3.239.186 – 10.3.239.18610.3.239.186
6010.3.239.187/3210.3.239.187 – 10.3.239.18710.3.239.187
6110.3.239.188/3210.3.239.188 – 10.3.239.18810.3.239.188
6210.3.239.189/3210.3.239.189 – 10.3.239.18910.3.239.189
6310.3.239.190/3210.3.239.190 – 10.3.239.19010.3.239.190
6410.3.239.191/3210.3.239.191 – 10.3.239.19110.3.239.191
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 →