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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)10.167.121.128/26
network10.167.121.128/26
broadcast10.167.121.191
first host10.167.121.129
last host10.167.121.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.167.121.128/26
address00001010.10100111.01111001.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100111.01111001.10000000
broadcast00001010.10100111.01111001.10111111
green = network part, grey = host part
hex0x0aa77980
decimal178747776
reverse dns128.121.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:7980

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.121.128/3210.167.121.128 – 10.167.121.12810.167.121.128
210.167.121.129/3210.167.121.129 – 10.167.121.12910.167.121.129
310.167.121.130/3210.167.121.130 – 10.167.121.13010.167.121.130
410.167.121.131/3210.167.121.131 – 10.167.121.13110.167.121.131
510.167.121.132/3210.167.121.132 – 10.167.121.13210.167.121.132
610.167.121.133/3210.167.121.133 – 10.167.121.13310.167.121.133
710.167.121.134/3210.167.121.134 – 10.167.121.13410.167.121.134
810.167.121.135/3210.167.121.135 – 10.167.121.13510.167.121.135
910.167.121.136/3210.167.121.136 – 10.167.121.13610.167.121.136
1010.167.121.137/3210.167.121.137 – 10.167.121.13710.167.121.137
1110.167.121.138/3210.167.121.138 – 10.167.121.13810.167.121.138
1210.167.121.139/3210.167.121.139 – 10.167.121.13910.167.121.139
1310.167.121.140/3210.167.121.140 – 10.167.121.14010.167.121.140
1410.167.121.141/3210.167.121.141 – 10.167.121.14110.167.121.141
1510.167.121.142/3210.167.121.142 – 10.167.121.14210.167.121.142
1610.167.121.143/3210.167.121.143 – 10.167.121.14310.167.121.143
1710.167.121.144/3210.167.121.144 – 10.167.121.14410.167.121.144
1810.167.121.145/3210.167.121.145 – 10.167.121.14510.167.121.145
1910.167.121.146/3210.167.121.146 – 10.167.121.14610.167.121.146
2010.167.121.147/3210.167.121.147 – 10.167.121.14710.167.121.147
2110.167.121.148/3210.167.121.148 – 10.167.121.14810.167.121.148
2210.167.121.149/3210.167.121.149 – 10.167.121.14910.167.121.149
2310.167.121.150/3210.167.121.150 – 10.167.121.15010.167.121.150
2410.167.121.151/3210.167.121.151 – 10.167.121.15110.167.121.151
2510.167.121.152/3210.167.121.152 – 10.167.121.15210.167.121.152
2610.167.121.153/3210.167.121.153 – 10.167.121.15310.167.121.153
2710.167.121.154/3210.167.121.154 – 10.167.121.15410.167.121.154
2810.167.121.155/3210.167.121.155 – 10.167.121.15510.167.121.155
2910.167.121.156/3210.167.121.156 – 10.167.121.15610.167.121.156
3010.167.121.157/3210.167.121.157 – 10.167.121.15710.167.121.157
3110.167.121.158/3210.167.121.158 – 10.167.121.15810.167.121.158
3210.167.121.159/3210.167.121.159 – 10.167.121.15910.167.121.159
3310.167.121.160/3210.167.121.160 – 10.167.121.16010.167.121.160
3410.167.121.161/3210.167.121.161 – 10.167.121.16110.167.121.161
3510.167.121.162/3210.167.121.162 – 10.167.121.16210.167.121.162
3610.167.121.163/3210.167.121.163 – 10.167.121.16310.167.121.163
3710.167.121.164/3210.167.121.164 – 10.167.121.16410.167.121.164
3810.167.121.165/3210.167.121.165 – 10.167.121.16510.167.121.165
3910.167.121.166/3210.167.121.166 – 10.167.121.16610.167.121.166
4010.167.121.167/3210.167.121.167 – 10.167.121.16710.167.121.167
4110.167.121.168/3210.167.121.168 – 10.167.121.16810.167.121.168
4210.167.121.169/3210.167.121.169 – 10.167.121.16910.167.121.169
4310.167.121.170/3210.167.121.170 – 10.167.121.17010.167.121.170
4410.167.121.171/3210.167.121.171 – 10.167.121.17110.167.121.171
4510.167.121.172/3210.167.121.172 – 10.167.121.17210.167.121.172
4610.167.121.173/3210.167.121.173 – 10.167.121.17310.167.121.173
4710.167.121.174/3210.167.121.174 – 10.167.121.17410.167.121.174
4810.167.121.175/3210.167.121.175 – 10.167.121.17510.167.121.175
4910.167.121.176/3210.167.121.176 – 10.167.121.17610.167.121.176
5010.167.121.177/3210.167.121.177 – 10.167.121.17710.167.121.177
5110.167.121.178/3210.167.121.178 – 10.167.121.17810.167.121.178
5210.167.121.179/3210.167.121.179 – 10.167.121.17910.167.121.179
5310.167.121.180/3210.167.121.180 – 10.167.121.18010.167.121.180
5410.167.121.181/3210.167.121.181 – 10.167.121.18110.167.121.181
5510.167.121.182/3210.167.121.182 – 10.167.121.18210.167.121.182
5610.167.121.183/3210.167.121.183 – 10.167.121.18310.167.121.183
5710.167.121.184/3210.167.121.184 – 10.167.121.18410.167.121.184
5810.167.121.185/3210.167.121.185 – 10.167.121.18510.167.121.185
5910.167.121.186/3210.167.121.186 – 10.167.121.18610.167.121.186
6010.167.121.187/3210.167.121.187 – 10.167.121.18710.167.121.187
6110.167.121.188/3210.167.121.188 – 10.167.121.18810.167.121.188
6210.167.121.189/3210.167.121.189 – 10.167.121.18910.167.121.189
6310.167.121.190/3210.167.121.190 – 10.167.121.19010.167.121.190
6410.167.121.191/3210.167.121.191 – 10.167.121.19110.167.121.191
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 →