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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)10.2.28.128/26
network10.2.28.128/26
broadcast10.2.28.191
first host10.2.28.129
last host10.2.28.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.28.128/26
address00001010.00000010.00011100.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00011100.10000000
broadcast00001010.00000010.00011100.10111111
green = network part, grey = host part
hex0x0a021c80
decimal167910528
reverse dns128.28.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1c80

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.28.128/3210.2.28.128 – 10.2.28.12810.2.28.128
210.2.28.129/3210.2.28.129 – 10.2.28.12910.2.28.129
310.2.28.130/3210.2.28.130 – 10.2.28.13010.2.28.130
410.2.28.131/3210.2.28.131 – 10.2.28.13110.2.28.131
510.2.28.132/3210.2.28.132 – 10.2.28.13210.2.28.132
610.2.28.133/3210.2.28.133 – 10.2.28.13310.2.28.133
710.2.28.134/3210.2.28.134 – 10.2.28.13410.2.28.134
810.2.28.135/3210.2.28.135 – 10.2.28.13510.2.28.135
910.2.28.136/3210.2.28.136 – 10.2.28.13610.2.28.136
1010.2.28.137/3210.2.28.137 – 10.2.28.13710.2.28.137
1110.2.28.138/3210.2.28.138 – 10.2.28.13810.2.28.138
1210.2.28.139/3210.2.28.139 – 10.2.28.13910.2.28.139
1310.2.28.140/3210.2.28.140 – 10.2.28.14010.2.28.140
1410.2.28.141/3210.2.28.141 – 10.2.28.14110.2.28.141
1510.2.28.142/3210.2.28.142 – 10.2.28.14210.2.28.142
1610.2.28.143/3210.2.28.143 – 10.2.28.14310.2.28.143
1710.2.28.144/3210.2.28.144 – 10.2.28.14410.2.28.144
1810.2.28.145/3210.2.28.145 – 10.2.28.14510.2.28.145
1910.2.28.146/3210.2.28.146 – 10.2.28.14610.2.28.146
2010.2.28.147/3210.2.28.147 – 10.2.28.14710.2.28.147
2110.2.28.148/3210.2.28.148 – 10.2.28.14810.2.28.148
2210.2.28.149/3210.2.28.149 – 10.2.28.14910.2.28.149
2310.2.28.150/3210.2.28.150 – 10.2.28.15010.2.28.150
2410.2.28.151/3210.2.28.151 – 10.2.28.15110.2.28.151
2510.2.28.152/3210.2.28.152 – 10.2.28.15210.2.28.152
2610.2.28.153/3210.2.28.153 – 10.2.28.15310.2.28.153
2710.2.28.154/3210.2.28.154 – 10.2.28.15410.2.28.154
2810.2.28.155/3210.2.28.155 – 10.2.28.15510.2.28.155
2910.2.28.156/3210.2.28.156 – 10.2.28.15610.2.28.156
3010.2.28.157/3210.2.28.157 – 10.2.28.15710.2.28.157
3110.2.28.158/3210.2.28.158 – 10.2.28.15810.2.28.158
3210.2.28.159/3210.2.28.159 – 10.2.28.15910.2.28.159
3310.2.28.160/3210.2.28.160 – 10.2.28.16010.2.28.160
3410.2.28.161/3210.2.28.161 – 10.2.28.16110.2.28.161
3510.2.28.162/3210.2.28.162 – 10.2.28.16210.2.28.162
3610.2.28.163/3210.2.28.163 – 10.2.28.16310.2.28.163
3710.2.28.164/3210.2.28.164 – 10.2.28.16410.2.28.164
3810.2.28.165/3210.2.28.165 – 10.2.28.16510.2.28.165
3910.2.28.166/3210.2.28.166 – 10.2.28.16610.2.28.166
4010.2.28.167/3210.2.28.167 – 10.2.28.16710.2.28.167
4110.2.28.168/3210.2.28.168 – 10.2.28.16810.2.28.168
4210.2.28.169/3210.2.28.169 – 10.2.28.16910.2.28.169
4310.2.28.170/3210.2.28.170 – 10.2.28.17010.2.28.170
4410.2.28.171/3210.2.28.171 – 10.2.28.17110.2.28.171
4510.2.28.172/3210.2.28.172 – 10.2.28.17210.2.28.172
4610.2.28.173/3210.2.28.173 – 10.2.28.17310.2.28.173
4710.2.28.174/3210.2.28.174 – 10.2.28.17410.2.28.174
4810.2.28.175/3210.2.28.175 – 10.2.28.17510.2.28.175
4910.2.28.176/3210.2.28.176 – 10.2.28.17610.2.28.176
5010.2.28.177/3210.2.28.177 – 10.2.28.17710.2.28.177
5110.2.28.178/3210.2.28.178 – 10.2.28.17810.2.28.178
5210.2.28.179/3210.2.28.179 – 10.2.28.17910.2.28.179
5310.2.28.180/3210.2.28.180 – 10.2.28.18010.2.28.180
5410.2.28.181/3210.2.28.181 – 10.2.28.18110.2.28.181
5510.2.28.182/3210.2.28.182 – 10.2.28.18210.2.28.182
5610.2.28.183/3210.2.28.183 – 10.2.28.18310.2.28.183
5710.2.28.184/3210.2.28.184 – 10.2.28.18410.2.28.184
5810.2.28.185/3210.2.28.185 – 10.2.28.18510.2.28.185
5910.2.28.186/3210.2.28.186 – 10.2.28.18610.2.28.186
6010.2.28.187/3210.2.28.187 – 10.2.28.18710.2.28.187
6110.2.28.188/3210.2.28.188 – 10.2.28.18810.2.28.188
6210.2.28.189/3210.2.28.189 – 10.2.28.18910.2.28.189
6310.2.28.190/3210.2.28.190 – 10.2.28.19010.2.28.190
6410.2.28.191/3210.2.28.191 – 10.2.28.19110.2.28.191
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 →