ip
ipku.in

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)10.4.45.128/26
network10.4.45.128/26
broadcast10.4.45.191
first host10.4.45.129
last host10.4.45.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.4.45.128/26
address00001010.00000100.00101101.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000100.00101101.10000000
broadcast00001010.00000100.00101101.10111111
green = network part, grey = host part
hex0x0a042d80
decimal168045952
reverse dns128.45.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:2d80

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.45.128/3210.4.45.128 – 10.4.45.12810.4.45.128
210.4.45.129/3210.4.45.129 – 10.4.45.12910.4.45.129
310.4.45.130/3210.4.45.130 – 10.4.45.13010.4.45.130
410.4.45.131/3210.4.45.131 – 10.4.45.13110.4.45.131
510.4.45.132/3210.4.45.132 – 10.4.45.13210.4.45.132
610.4.45.133/3210.4.45.133 – 10.4.45.13310.4.45.133
710.4.45.134/3210.4.45.134 – 10.4.45.13410.4.45.134
810.4.45.135/3210.4.45.135 – 10.4.45.13510.4.45.135
910.4.45.136/3210.4.45.136 – 10.4.45.13610.4.45.136
1010.4.45.137/3210.4.45.137 – 10.4.45.13710.4.45.137
1110.4.45.138/3210.4.45.138 – 10.4.45.13810.4.45.138
1210.4.45.139/3210.4.45.139 – 10.4.45.13910.4.45.139
1310.4.45.140/3210.4.45.140 – 10.4.45.14010.4.45.140
1410.4.45.141/3210.4.45.141 – 10.4.45.14110.4.45.141
1510.4.45.142/3210.4.45.142 – 10.4.45.14210.4.45.142
1610.4.45.143/3210.4.45.143 – 10.4.45.14310.4.45.143
1710.4.45.144/3210.4.45.144 – 10.4.45.14410.4.45.144
1810.4.45.145/3210.4.45.145 – 10.4.45.14510.4.45.145
1910.4.45.146/3210.4.45.146 – 10.4.45.14610.4.45.146
2010.4.45.147/3210.4.45.147 – 10.4.45.14710.4.45.147
2110.4.45.148/3210.4.45.148 – 10.4.45.14810.4.45.148
2210.4.45.149/3210.4.45.149 – 10.4.45.14910.4.45.149
2310.4.45.150/3210.4.45.150 – 10.4.45.15010.4.45.150
2410.4.45.151/3210.4.45.151 – 10.4.45.15110.4.45.151
2510.4.45.152/3210.4.45.152 – 10.4.45.15210.4.45.152
2610.4.45.153/3210.4.45.153 – 10.4.45.15310.4.45.153
2710.4.45.154/3210.4.45.154 – 10.4.45.15410.4.45.154
2810.4.45.155/3210.4.45.155 – 10.4.45.15510.4.45.155
2910.4.45.156/3210.4.45.156 – 10.4.45.15610.4.45.156
3010.4.45.157/3210.4.45.157 – 10.4.45.15710.4.45.157
3110.4.45.158/3210.4.45.158 – 10.4.45.15810.4.45.158
3210.4.45.159/3210.4.45.159 – 10.4.45.15910.4.45.159
3310.4.45.160/3210.4.45.160 – 10.4.45.16010.4.45.160
3410.4.45.161/3210.4.45.161 – 10.4.45.16110.4.45.161
3510.4.45.162/3210.4.45.162 – 10.4.45.16210.4.45.162
3610.4.45.163/3210.4.45.163 – 10.4.45.16310.4.45.163
3710.4.45.164/3210.4.45.164 – 10.4.45.16410.4.45.164
3810.4.45.165/3210.4.45.165 – 10.4.45.16510.4.45.165
3910.4.45.166/3210.4.45.166 – 10.4.45.16610.4.45.166
4010.4.45.167/3210.4.45.167 – 10.4.45.16710.4.45.167
4110.4.45.168/3210.4.45.168 – 10.4.45.16810.4.45.168
4210.4.45.169/3210.4.45.169 – 10.4.45.16910.4.45.169
4310.4.45.170/3210.4.45.170 – 10.4.45.17010.4.45.170
4410.4.45.171/3210.4.45.171 – 10.4.45.17110.4.45.171
4510.4.45.172/3210.4.45.172 – 10.4.45.17210.4.45.172
4610.4.45.173/3210.4.45.173 – 10.4.45.17310.4.45.173
4710.4.45.174/3210.4.45.174 – 10.4.45.17410.4.45.174
4810.4.45.175/3210.4.45.175 – 10.4.45.17510.4.45.175
4910.4.45.176/3210.4.45.176 – 10.4.45.17610.4.45.176
5010.4.45.177/3210.4.45.177 – 10.4.45.17710.4.45.177
5110.4.45.178/3210.4.45.178 – 10.4.45.17810.4.45.178
5210.4.45.179/3210.4.45.179 – 10.4.45.17910.4.45.179
5310.4.45.180/3210.4.45.180 – 10.4.45.18010.4.45.180
5410.4.45.181/3210.4.45.181 – 10.4.45.18110.4.45.181
5510.4.45.182/3210.4.45.182 – 10.4.45.18210.4.45.182
5610.4.45.183/3210.4.45.183 – 10.4.45.18310.4.45.183
5710.4.45.184/3210.4.45.184 – 10.4.45.18410.4.45.184
5810.4.45.185/3210.4.45.185 – 10.4.45.18510.4.45.185
5910.4.45.186/3210.4.45.186 – 10.4.45.18610.4.45.186
6010.4.45.187/3210.4.45.187 – 10.4.45.18710.4.45.187
6110.4.45.188/3210.4.45.188 – 10.4.45.18810.4.45.188
6210.4.45.189/3210.4.45.189 – 10.4.45.18910.4.45.189
6310.4.45.190/3210.4.45.190 – 10.4.45.19010.4.45.190
6410.4.45.191/3210.4.45.191 – 10.4.45.19110.4.45.191
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 →