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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)10.3.78.128/26
network10.3.78.128/26
broadcast10.3.78.191
first host10.3.78.129
last host10.3.78.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.78.128/26
address00001010.00000011.01001110.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.01001110.10000000
broadcast00001010.00000011.01001110.10111111
green = network part, grey = host part
hex0x0a034e80
decimal167988864
reverse dns128.78.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4e80

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.78.128/3210.3.78.128 – 10.3.78.12810.3.78.128
210.3.78.129/3210.3.78.129 – 10.3.78.12910.3.78.129
310.3.78.130/3210.3.78.130 – 10.3.78.13010.3.78.130
410.3.78.131/3210.3.78.131 – 10.3.78.13110.3.78.131
510.3.78.132/3210.3.78.132 – 10.3.78.13210.3.78.132
610.3.78.133/3210.3.78.133 – 10.3.78.13310.3.78.133
710.3.78.134/3210.3.78.134 – 10.3.78.13410.3.78.134
810.3.78.135/3210.3.78.135 – 10.3.78.13510.3.78.135
910.3.78.136/3210.3.78.136 – 10.3.78.13610.3.78.136
1010.3.78.137/3210.3.78.137 – 10.3.78.13710.3.78.137
1110.3.78.138/3210.3.78.138 – 10.3.78.13810.3.78.138
1210.3.78.139/3210.3.78.139 – 10.3.78.13910.3.78.139
1310.3.78.140/3210.3.78.140 – 10.3.78.14010.3.78.140
1410.3.78.141/3210.3.78.141 – 10.3.78.14110.3.78.141
1510.3.78.142/3210.3.78.142 – 10.3.78.14210.3.78.142
1610.3.78.143/3210.3.78.143 – 10.3.78.14310.3.78.143
1710.3.78.144/3210.3.78.144 – 10.3.78.14410.3.78.144
1810.3.78.145/3210.3.78.145 – 10.3.78.14510.3.78.145
1910.3.78.146/3210.3.78.146 – 10.3.78.14610.3.78.146
2010.3.78.147/3210.3.78.147 – 10.3.78.14710.3.78.147
2110.3.78.148/3210.3.78.148 – 10.3.78.14810.3.78.148
2210.3.78.149/3210.3.78.149 – 10.3.78.14910.3.78.149
2310.3.78.150/3210.3.78.150 – 10.3.78.15010.3.78.150
2410.3.78.151/3210.3.78.151 – 10.3.78.15110.3.78.151
2510.3.78.152/3210.3.78.152 – 10.3.78.15210.3.78.152
2610.3.78.153/3210.3.78.153 – 10.3.78.15310.3.78.153
2710.3.78.154/3210.3.78.154 – 10.3.78.15410.3.78.154
2810.3.78.155/3210.3.78.155 – 10.3.78.15510.3.78.155
2910.3.78.156/3210.3.78.156 – 10.3.78.15610.3.78.156
3010.3.78.157/3210.3.78.157 – 10.3.78.15710.3.78.157
3110.3.78.158/3210.3.78.158 – 10.3.78.15810.3.78.158
3210.3.78.159/3210.3.78.159 – 10.3.78.15910.3.78.159
3310.3.78.160/3210.3.78.160 – 10.3.78.16010.3.78.160
3410.3.78.161/3210.3.78.161 – 10.3.78.16110.3.78.161
3510.3.78.162/3210.3.78.162 – 10.3.78.16210.3.78.162
3610.3.78.163/3210.3.78.163 – 10.3.78.16310.3.78.163
3710.3.78.164/3210.3.78.164 – 10.3.78.16410.3.78.164
3810.3.78.165/3210.3.78.165 – 10.3.78.16510.3.78.165
3910.3.78.166/3210.3.78.166 – 10.3.78.16610.3.78.166
4010.3.78.167/3210.3.78.167 – 10.3.78.16710.3.78.167
4110.3.78.168/3210.3.78.168 – 10.3.78.16810.3.78.168
4210.3.78.169/3210.3.78.169 – 10.3.78.16910.3.78.169
4310.3.78.170/3210.3.78.170 – 10.3.78.17010.3.78.170
4410.3.78.171/3210.3.78.171 – 10.3.78.17110.3.78.171
4510.3.78.172/3210.3.78.172 – 10.3.78.17210.3.78.172
4610.3.78.173/3210.3.78.173 – 10.3.78.17310.3.78.173
4710.3.78.174/3210.3.78.174 – 10.3.78.17410.3.78.174
4810.3.78.175/3210.3.78.175 – 10.3.78.17510.3.78.175
4910.3.78.176/3210.3.78.176 – 10.3.78.17610.3.78.176
5010.3.78.177/3210.3.78.177 – 10.3.78.17710.3.78.177
5110.3.78.178/3210.3.78.178 – 10.3.78.17810.3.78.178
5210.3.78.179/3210.3.78.179 – 10.3.78.17910.3.78.179
5310.3.78.180/3210.3.78.180 – 10.3.78.18010.3.78.180
5410.3.78.181/3210.3.78.181 – 10.3.78.18110.3.78.181
5510.3.78.182/3210.3.78.182 – 10.3.78.18210.3.78.182
5610.3.78.183/3210.3.78.183 – 10.3.78.18310.3.78.183
5710.3.78.184/3210.3.78.184 – 10.3.78.18410.3.78.184
5810.3.78.185/3210.3.78.185 – 10.3.78.18510.3.78.185
5910.3.78.186/3210.3.78.186 – 10.3.78.18610.3.78.186
6010.3.78.187/3210.3.78.187 – 10.3.78.18710.3.78.187
6110.3.78.188/3210.3.78.188 – 10.3.78.18810.3.78.188
6210.3.78.189/3210.3.78.189 – 10.3.78.18910.3.78.189
6310.3.78.190/3210.3.78.190 – 10.3.78.19010.3.78.190
6410.3.78.191/3210.3.78.191 – 10.3.78.19110.3.78.191
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 →