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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)10.78.166.128/25
network10.78.166.128/25
broadcast10.78.166.255
first host10.78.166.129
last host10.78.166.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.166.128/25
address00001010.01001110.10100110.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.10100110.10000000
broadcast00001010.01001110.10100110.11111111
green = network part, grey = host part
hex0x0a4ea680
decimal172926592
reverse dns128.166.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:a680

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.166.128/3110.78.166.128 – 10.78.166.12910.78.166.129
210.78.166.130/3110.78.166.130 – 10.78.166.13110.78.166.131
310.78.166.132/3110.78.166.132 – 10.78.166.13310.78.166.133
410.78.166.134/3110.78.166.134 – 10.78.166.13510.78.166.135
510.78.166.136/3110.78.166.136 – 10.78.166.13710.78.166.137
610.78.166.138/3110.78.166.138 – 10.78.166.13910.78.166.139
710.78.166.140/3110.78.166.140 – 10.78.166.14110.78.166.141
810.78.166.142/3110.78.166.142 – 10.78.166.14310.78.166.143
910.78.166.144/3110.78.166.144 – 10.78.166.14510.78.166.145
1010.78.166.146/3110.78.166.146 – 10.78.166.14710.78.166.147
1110.78.166.148/3110.78.166.148 – 10.78.166.14910.78.166.149
1210.78.166.150/3110.78.166.150 – 10.78.166.15110.78.166.151
1310.78.166.152/3110.78.166.152 – 10.78.166.15310.78.166.153
1410.78.166.154/3110.78.166.154 – 10.78.166.15510.78.166.155
1510.78.166.156/3110.78.166.156 – 10.78.166.15710.78.166.157
1610.78.166.158/3110.78.166.158 – 10.78.166.15910.78.166.159
1710.78.166.160/3110.78.166.160 – 10.78.166.16110.78.166.161
1810.78.166.162/3110.78.166.162 – 10.78.166.16310.78.166.163
1910.78.166.164/3110.78.166.164 – 10.78.166.16510.78.166.165
2010.78.166.166/3110.78.166.166 – 10.78.166.16710.78.166.167
2110.78.166.168/3110.78.166.168 – 10.78.166.16910.78.166.169
2210.78.166.170/3110.78.166.170 – 10.78.166.17110.78.166.171
2310.78.166.172/3110.78.166.172 – 10.78.166.17310.78.166.173
2410.78.166.174/3110.78.166.174 – 10.78.166.17510.78.166.175
2510.78.166.176/3110.78.166.176 – 10.78.166.17710.78.166.177
2610.78.166.178/3110.78.166.178 – 10.78.166.17910.78.166.179
2710.78.166.180/3110.78.166.180 – 10.78.166.18110.78.166.181
2810.78.166.182/3110.78.166.182 – 10.78.166.18310.78.166.183
2910.78.166.184/3110.78.166.184 – 10.78.166.18510.78.166.185
3010.78.166.186/3110.78.166.186 – 10.78.166.18710.78.166.187
3110.78.166.188/3110.78.166.188 – 10.78.166.18910.78.166.189
3210.78.166.190/3110.78.166.190 – 10.78.166.19110.78.166.191
3310.78.166.192/3110.78.166.192 – 10.78.166.19310.78.166.193
3410.78.166.194/3110.78.166.194 – 10.78.166.19510.78.166.195
3510.78.166.196/3110.78.166.196 – 10.78.166.19710.78.166.197
3610.78.166.198/3110.78.166.198 – 10.78.166.19910.78.166.199
3710.78.166.200/3110.78.166.200 – 10.78.166.20110.78.166.201
3810.78.166.202/3110.78.166.202 – 10.78.166.20310.78.166.203
3910.78.166.204/3110.78.166.204 – 10.78.166.20510.78.166.205
4010.78.166.206/3110.78.166.206 – 10.78.166.20710.78.166.207
4110.78.166.208/3110.78.166.208 – 10.78.166.20910.78.166.209
4210.78.166.210/3110.78.166.210 – 10.78.166.21110.78.166.211
4310.78.166.212/3110.78.166.212 – 10.78.166.21310.78.166.213
4410.78.166.214/3110.78.166.214 – 10.78.166.21510.78.166.215
4510.78.166.216/3110.78.166.216 – 10.78.166.21710.78.166.217
4610.78.166.218/3110.78.166.218 – 10.78.166.21910.78.166.219
4710.78.166.220/3110.78.166.220 – 10.78.166.22110.78.166.221
4810.78.166.222/3110.78.166.222 – 10.78.166.22310.78.166.223
4910.78.166.224/3110.78.166.224 – 10.78.166.22510.78.166.225
5010.78.166.226/3110.78.166.226 – 10.78.166.22710.78.166.227
5110.78.166.228/3110.78.166.228 – 10.78.166.22910.78.166.229
5210.78.166.230/3110.78.166.230 – 10.78.166.23110.78.166.231
5310.78.166.232/3110.78.166.232 – 10.78.166.23310.78.166.233
5410.78.166.234/3110.78.166.234 – 10.78.166.23510.78.166.235
5510.78.166.236/3110.78.166.236 – 10.78.166.23710.78.166.237
5610.78.166.238/3110.78.166.238 – 10.78.166.23910.78.166.239
5710.78.166.240/3110.78.166.240 – 10.78.166.24110.78.166.241
5810.78.166.242/3110.78.166.242 – 10.78.166.24310.78.166.243
5910.78.166.244/3110.78.166.244 – 10.78.166.24510.78.166.245
6010.78.166.246/3110.78.166.246 – 10.78.166.24710.78.166.247
6110.78.166.248/3110.78.166.248 – 10.78.166.24910.78.166.249
6210.78.166.250/3110.78.166.250 – 10.78.166.25110.78.166.251
6310.78.166.252/3110.78.166.252 – 10.78.166.25310.78.166.253
6410.78.166.254/3110.78.166.254 – 10.78.166.25510.78.166.255
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 →