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)10.78.1.128/25
network10.78.1.128/25
broadcast10.78.1.255
first host10.78.1.129
last host10.78.1.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.1.128/25
address00001010.01001110.00000001.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.00000001.10000000
broadcast00001010.01001110.00000001.11111111
green = network part, grey = host part
hex0x0a4e0180
decimal172884352
reverse dns128.1.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:180

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.1.128/3110.78.1.128 – 10.78.1.12910.78.1.129
210.78.1.130/3110.78.1.130 – 10.78.1.13110.78.1.131
310.78.1.132/3110.78.1.132 – 10.78.1.13310.78.1.133
410.78.1.134/3110.78.1.134 – 10.78.1.13510.78.1.135
510.78.1.136/3110.78.1.136 – 10.78.1.13710.78.1.137
610.78.1.138/3110.78.1.138 – 10.78.1.13910.78.1.139
710.78.1.140/3110.78.1.140 – 10.78.1.14110.78.1.141
810.78.1.142/3110.78.1.142 – 10.78.1.14310.78.1.143
910.78.1.144/3110.78.1.144 – 10.78.1.14510.78.1.145
1010.78.1.146/3110.78.1.146 – 10.78.1.14710.78.1.147
1110.78.1.148/3110.78.1.148 – 10.78.1.14910.78.1.149
1210.78.1.150/3110.78.1.150 – 10.78.1.15110.78.1.151
1310.78.1.152/3110.78.1.152 – 10.78.1.15310.78.1.153
1410.78.1.154/3110.78.1.154 – 10.78.1.15510.78.1.155
1510.78.1.156/3110.78.1.156 – 10.78.1.15710.78.1.157
1610.78.1.158/3110.78.1.158 – 10.78.1.15910.78.1.159
1710.78.1.160/3110.78.1.160 – 10.78.1.16110.78.1.161
1810.78.1.162/3110.78.1.162 – 10.78.1.16310.78.1.163
1910.78.1.164/3110.78.1.164 – 10.78.1.16510.78.1.165
2010.78.1.166/3110.78.1.166 – 10.78.1.16710.78.1.167
2110.78.1.168/3110.78.1.168 – 10.78.1.16910.78.1.169
2210.78.1.170/3110.78.1.170 – 10.78.1.17110.78.1.171
2310.78.1.172/3110.78.1.172 – 10.78.1.17310.78.1.173
2410.78.1.174/3110.78.1.174 – 10.78.1.17510.78.1.175
2510.78.1.176/3110.78.1.176 – 10.78.1.17710.78.1.177
2610.78.1.178/3110.78.1.178 – 10.78.1.17910.78.1.179
2710.78.1.180/3110.78.1.180 – 10.78.1.18110.78.1.181
2810.78.1.182/3110.78.1.182 – 10.78.1.18310.78.1.183
2910.78.1.184/3110.78.1.184 – 10.78.1.18510.78.1.185
3010.78.1.186/3110.78.1.186 – 10.78.1.18710.78.1.187
3110.78.1.188/3110.78.1.188 – 10.78.1.18910.78.1.189
3210.78.1.190/3110.78.1.190 – 10.78.1.19110.78.1.191
3310.78.1.192/3110.78.1.192 – 10.78.1.19310.78.1.193
3410.78.1.194/3110.78.1.194 – 10.78.1.19510.78.1.195
3510.78.1.196/3110.78.1.196 – 10.78.1.19710.78.1.197
3610.78.1.198/3110.78.1.198 – 10.78.1.19910.78.1.199
3710.78.1.200/3110.78.1.200 – 10.78.1.20110.78.1.201
3810.78.1.202/3110.78.1.202 – 10.78.1.20310.78.1.203
3910.78.1.204/3110.78.1.204 – 10.78.1.20510.78.1.205
4010.78.1.206/3110.78.1.206 – 10.78.1.20710.78.1.207
4110.78.1.208/3110.78.1.208 – 10.78.1.20910.78.1.209
4210.78.1.210/3110.78.1.210 – 10.78.1.21110.78.1.211
4310.78.1.212/3110.78.1.212 – 10.78.1.21310.78.1.213
4410.78.1.214/3110.78.1.214 – 10.78.1.21510.78.1.215
4510.78.1.216/3110.78.1.216 – 10.78.1.21710.78.1.217
4610.78.1.218/3110.78.1.218 – 10.78.1.21910.78.1.219
4710.78.1.220/3110.78.1.220 – 10.78.1.22110.78.1.221
4810.78.1.222/3110.78.1.222 – 10.78.1.22310.78.1.223
4910.78.1.224/3110.78.1.224 – 10.78.1.22510.78.1.225
5010.78.1.226/3110.78.1.226 – 10.78.1.22710.78.1.227
5110.78.1.228/3110.78.1.228 – 10.78.1.22910.78.1.229
5210.78.1.230/3110.78.1.230 – 10.78.1.23110.78.1.231
5310.78.1.232/3110.78.1.232 – 10.78.1.23310.78.1.233
5410.78.1.234/3110.78.1.234 – 10.78.1.23510.78.1.235
5510.78.1.236/3110.78.1.236 – 10.78.1.23710.78.1.237
5610.78.1.238/3110.78.1.238 – 10.78.1.23910.78.1.239
5710.78.1.240/3110.78.1.240 – 10.78.1.24110.78.1.241
5810.78.1.242/3110.78.1.242 – 10.78.1.24310.78.1.243
5910.78.1.244/3110.78.1.244 – 10.78.1.24510.78.1.245
6010.78.1.246/3110.78.1.246 – 10.78.1.24710.78.1.247
6110.78.1.248/3110.78.1.248 – 10.78.1.24910.78.1.249
6210.78.1.250/3110.78.1.250 – 10.78.1.25110.78.1.251
6310.78.1.252/3110.78.1.252 – 10.78.1.25310.78.1.253
6410.78.1.254/3110.78.1.254 – 10.78.1.25510.78.1.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /25
/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-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →