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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)10.64.3.128/26
network10.64.3.128/26
broadcast10.64.3.191
first host10.64.3.129
last host10.64.3.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.64.3.128/26
address00001010.01000000.00000011.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.01000000.00000011.10000000
broadcast00001010.01000000.00000011.10111111
green = network part, grey = host part
hex0x0a400380
decimal171967360
reverse dns128.3.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:380

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.64.3.128/3210.64.3.128 – 10.64.3.12810.64.3.128
210.64.3.129/3210.64.3.129 – 10.64.3.12910.64.3.129
310.64.3.130/3210.64.3.130 – 10.64.3.13010.64.3.130
410.64.3.131/3210.64.3.131 – 10.64.3.13110.64.3.131
510.64.3.132/3210.64.3.132 – 10.64.3.13210.64.3.132
610.64.3.133/3210.64.3.133 – 10.64.3.13310.64.3.133
710.64.3.134/3210.64.3.134 – 10.64.3.13410.64.3.134
810.64.3.135/3210.64.3.135 – 10.64.3.13510.64.3.135
910.64.3.136/3210.64.3.136 – 10.64.3.13610.64.3.136
1010.64.3.137/3210.64.3.137 – 10.64.3.13710.64.3.137
1110.64.3.138/3210.64.3.138 – 10.64.3.13810.64.3.138
1210.64.3.139/3210.64.3.139 – 10.64.3.13910.64.3.139
1310.64.3.140/3210.64.3.140 – 10.64.3.14010.64.3.140
1410.64.3.141/3210.64.3.141 – 10.64.3.14110.64.3.141
1510.64.3.142/3210.64.3.142 – 10.64.3.14210.64.3.142
1610.64.3.143/3210.64.3.143 – 10.64.3.14310.64.3.143
1710.64.3.144/3210.64.3.144 – 10.64.3.14410.64.3.144
1810.64.3.145/3210.64.3.145 – 10.64.3.14510.64.3.145
1910.64.3.146/3210.64.3.146 – 10.64.3.14610.64.3.146
2010.64.3.147/3210.64.3.147 – 10.64.3.14710.64.3.147
2110.64.3.148/3210.64.3.148 – 10.64.3.14810.64.3.148
2210.64.3.149/3210.64.3.149 – 10.64.3.14910.64.3.149
2310.64.3.150/3210.64.3.150 – 10.64.3.15010.64.3.150
2410.64.3.151/3210.64.3.151 – 10.64.3.15110.64.3.151
2510.64.3.152/3210.64.3.152 – 10.64.3.15210.64.3.152
2610.64.3.153/3210.64.3.153 – 10.64.3.15310.64.3.153
2710.64.3.154/3210.64.3.154 – 10.64.3.15410.64.3.154
2810.64.3.155/3210.64.3.155 – 10.64.3.15510.64.3.155
2910.64.3.156/3210.64.3.156 – 10.64.3.15610.64.3.156
3010.64.3.157/3210.64.3.157 – 10.64.3.15710.64.3.157
3110.64.3.158/3210.64.3.158 – 10.64.3.15810.64.3.158
3210.64.3.159/3210.64.3.159 – 10.64.3.15910.64.3.159
3310.64.3.160/3210.64.3.160 – 10.64.3.16010.64.3.160
3410.64.3.161/3210.64.3.161 – 10.64.3.16110.64.3.161
3510.64.3.162/3210.64.3.162 – 10.64.3.16210.64.3.162
3610.64.3.163/3210.64.3.163 – 10.64.3.16310.64.3.163
3710.64.3.164/3210.64.3.164 – 10.64.3.16410.64.3.164
3810.64.3.165/3210.64.3.165 – 10.64.3.16510.64.3.165
3910.64.3.166/3210.64.3.166 – 10.64.3.16610.64.3.166
4010.64.3.167/3210.64.3.167 – 10.64.3.16710.64.3.167
4110.64.3.168/3210.64.3.168 – 10.64.3.16810.64.3.168
4210.64.3.169/3210.64.3.169 – 10.64.3.16910.64.3.169
4310.64.3.170/3210.64.3.170 – 10.64.3.17010.64.3.170
4410.64.3.171/3210.64.3.171 – 10.64.3.17110.64.3.171
4510.64.3.172/3210.64.3.172 – 10.64.3.17210.64.3.172
4610.64.3.173/3210.64.3.173 – 10.64.3.17310.64.3.173
4710.64.3.174/3210.64.3.174 – 10.64.3.17410.64.3.174
4810.64.3.175/3210.64.3.175 – 10.64.3.17510.64.3.175
4910.64.3.176/3210.64.3.176 – 10.64.3.17610.64.3.176
5010.64.3.177/3210.64.3.177 – 10.64.3.17710.64.3.177
5110.64.3.178/3210.64.3.178 – 10.64.3.17810.64.3.178
5210.64.3.179/3210.64.3.179 – 10.64.3.17910.64.3.179
5310.64.3.180/3210.64.3.180 – 10.64.3.18010.64.3.180
5410.64.3.181/3210.64.3.181 – 10.64.3.18110.64.3.181
5510.64.3.182/3210.64.3.182 – 10.64.3.18210.64.3.182
5610.64.3.183/3210.64.3.183 – 10.64.3.18310.64.3.183
5710.64.3.184/3210.64.3.184 – 10.64.3.18410.64.3.184
5810.64.3.185/3210.64.3.185 – 10.64.3.18510.64.3.185
5910.64.3.186/3210.64.3.186 – 10.64.3.18610.64.3.186
6010.64.3.187/3210.64.3.187 – 10.64.3.18710.64.3.187
6110.64.3.188/3210.64.3.188 – 10.64.3.18810.64.3.188
6210.64.3.189/3210.64.3.189 – 10.64.3.18910.64.3.189
6310.64.3.190/3210.64.3.190 – 10.64.3.19010.64.3.190
6410.64.3.191/3210.64.3.191 – 10.64.3.19110.64.3.191
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 →