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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)10.167.20.128/26
network10.167.20.128/26
broadcast10.167.20.191
first host10.167.20.129
last host10.167.20.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.167.20.128/26
address00001010.10100111.00010100.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100111.00010100.10000000
broadcast00001010.10100111.00010100.10111111
green = network part, grey = host part
hex0x0aa71480
decimal178721920
reverse dns128.20.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:1480

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.20.128/3210.167.20.128 – 10.167.20.12810.167.20.128
210.167.20.129/3210.167.20.129 – 10.167.20.12910.167.20.129
310.167.20.130/3210.167.20.130 – 10.167.20.13010.167.20.130
410.167.20.131/3210.167.20.131 – 10.167.20.13110.167.20.131
510.167.20.132/3210.167.20.132 – 10.167.20.13210.167.20.132
610.167.20.133/3210.167.20.133 – 10.167.20.13310.167.20.133
710.167.20.134/3210.167.20.134 – 10.167.20.13410.167.20.134
810.167.20.135/3210.167.20.135 – 10.167.20.13510.167.20.135
910.167.20.136/3210.167.20.136 – 10.167.20.13610.167.20.136
1010.167.20.137/3210.167.20.137 – 10.167.20.13710.167.20.137
1110.167.20.138/3210.167.20.138 – 10.167.20.13810.167.20.138
1210.167.20.139/3210.167.20.139 – 10.167.20.13910.167.20.139
1310.167.20.140/3210.167.20.140 – 10.167.20.14010.167.20.140
1410.167.20.141/3210.167.20.141 – 10.167.20.14110.167.20.141
1510.167.20.142/3210.167.20.142 – 10.167.20.14210.167.20.142
1610.167.20.143/3210.167.20.143 – 10.167.20.14310.167.20.143
1710.167.20.144/3210.167.20.144 – 10.167.20.14410.167.20.144
1810.167.20.145/3210.167.20.145 – 10.167.20.14510.167.20.145
1910.167.20.146/3210.167.20.146 – 10.167.20.14610.167.20.146
2010.167.20.147/3210.167.20.147 – 10.167.20.14710.167.20.147
2110.167.20.148/3210.167.20.148 – 10.167.20.14810.167.20.148
2210.167.20.149/3210.167.20.149 – 10.167.20.14910.167.20.149
2310.167.20.150/3210.167.20.150 – 10.167.20.15010.167.20.150
2410.167.20.151/3210.167.20.151 – 10.167.20.15110.167.20.151
2510.167.20.152/3210.167.20.152 – 10.167.20.15210.167.20.152
2610.167.20.153/3210.167.20.153 – 10.167.20.15310.167.20.153
2710.167.20.154/3210.167.20.154 – 10.167.20.15410.167.20.154
2810.167.20.155/3210.167.20.155 – 10.167.20.15510.167.20.155
2910.167.20.156/3210.167.20.156 – 10.167.20.15610.167.20.156
3010.167.20.157/3210.167.20.157 – 10.167.20.15710.167.20.157
3110.167.20.158/3210.167.20.158 – 10.167.20.15810.167.20.158
3210.167.20.159/3210.167.20.159 – 10.167.20.15910.167.20.159
3310.167.20.160/3210.167.20.160 – 10.167.20.16010.167.20.160
3410.167.20.161/3210.167.20.161 – 10.167.20.16110.167.20.161
3510.167.20.162/3210.167.20.162 – 10.167.20.16210.167.20.162
3610.167.20.163/3210.167.20.163 – 10.167.20.16310.167.20.163
3710.167.20.164/3210.167.20.164 – 10.167.20.16410.167.20.164
3810.167.20.165/3210.167.20.165 – 10.167.20.16510.167.20.165
3910.167.20.166/3210.167.20.166 – 10.167.20.16610.167.20.166
4010.167.20.167/3210.167.20.167 – 10.167.20.16710.167.20.167
4110.167.20.168/3210.167.20.168 – 10.167.20.16810.167.20.168
4210.167.20.169/3210.167.20.169 – 10.167.20.16910.167.20.169
4310.167.20.170/3210.167.20.170 – 10.167.20.17010.167.20.170
4410.167.20.171/3210.167.20.171 – 10.167.20.17110.167.20.171
4510.167.20.172/3210.167.20.172 – 10.167.20.17210.167.20.172
4610.167.20.173/3210.167.20.173 – 10.167.20.17310.167.20.173
4710.167.20.174/3210.167.20.174 – 10.167.20.17410.167.20.174
4810.167.20.175/3210.167.20.175 – 10.167.20.17510.167.20.175
4910.167.20.176/3210.167.20.176 – 10.167.20.17610.167.20.176
5010.167.20.177/3210.167.20.177 – 10.167.20.17710.167.20.177
5110.167.20.178/3210.167.20.178 – 10.167.20.17810.167.20.178
5210.167.20.179/3210.167.20.179 – 10.167.20.17910.167.20.179
5310.167.20.180/3210.167.20.180 – 10.167.20.18010.167.20.180
5410.167.20.181/3210.167.20.181 – 10.167.20.18110.167.20.181
5510.167.20.182/3210.167.20.182 – 10.167.20.18210.167.20.182
5610.167.20.183/3210.167.20.183 – 10.167.20.18310.167.20.183
5710.167.20.184/3210.167.20.184 – 10.167.20.18410.167.20.184
5810.167.20.185/3210.167.20.185 – 10.167.20.18510.167.20.185
5910.167.20.186/3210.167.20.186 – 10.167.20.18610.167.20.186
6010.167.20.187/3210.167.20.187 – 10.167.20.18710.167.20.187
6110.167.20.188/3210.167.20.188 – 10.167.20.18810.167.20.188
6210.167.20.189/3210.167.20.189 – 10.167.20.18910.167.20.189
6310.167.20.190/3210.167.20.190 – 10.167.20.19010.167.20.190
6410.167.20.191/3210.167.20.191 – 10.167.20.19110.167.20.191
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 →