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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)10.78.85.128/25
network10.78.85.128/25
broadcast10.78.85.255
first host10.78.85.129
last host10.78.85.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.78.85.128/25
address00001010.01001110.01010101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001110.01010101.10000000
broadcast00001010.01001110.01010101.11111111
green = network part, grey = host part
hex0x0a4e5580
decimal172905856
reverse dns128.85.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:5580

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.85.128/3110.78.85.128 – 10.78.85.12910.78.85.129
210.78.85.130/3110.78.85.130 – 10.78.85.13110.78.85.131
310.78.85.132/3110.78.85.132 – 10.78.85.13310.78.85.133
410.78.85.134/3110.78.85.134 – 10.78.85.13510.78.85.135
510.78.85.136/3110.78.85.136 – 10.78.85.13710.78.85.137
610.78.85.138/3110.78.85.138 – 10.78.85.13910.78.85.139
710.78.85.140/3110.78.85.140 – 10.78.85.14110.78.85.141
810.78.85.142/3110.78.85.142 – 10.78.85.14310.78.85.143
910.78.85.144/3110.78.85.144 – 10.78.85.14510.78.85.145
1010.78.85.146/3110.78.85.146 – 10.78.85.14710.78.85.147
1110.78.85.148/3110.78.85.148 – 10.78.85.14910.78.85.149
1210.78.85.150/3110.78.85.150 – 10.78.85.15110.78.85.151
1310.78.85.152/3110.78.85.152 – 10.78.85.15310.78.85.153
1410.78.85.154/3110.78.85.154 – 10.78.85.15510.78.85.155
1510.78.85.156/3110.78.85.156 – 10.78.85.15710.78.85.157
1610.78.85.158/3110.78.85.158 – 10.78.85.15910.78.85.159
1710.78.85.160/3110.78.85.160 – 10.78.85.16110.78.85.161
1810.78.85.162/3110.78.85.162 – 10.78.85.16310.78.85.163
1910.78.85.164/3110.78.85.164 – 10.78.85.16510.78.85.165
2010.78.85.166/3110.78.85.166 – 10.78.85.16710.78.85.167
2110.78.85.168/3110.78.85.168 – 10.78.85.16910.78.85.169
2210.78.85.170/3110.78.85.170 – 10.78.85.17110.78.85.171
2310.78.85.172/3110.78.85.172 – 10.78.85.17310.78.85.173
2410.78.85.174/3110.78.85.174 – 10.78.85.17510.78.85.175
2510.78.85.176/3110.78.85.176 – 10.78.85.17710.78.85.177
2610.78.85.178/3110.78.85.178 – 10.78.85.17910.78.85.179
2710.78.85.180/3110.78.85.180 – 10.78.85.18110.78.85.181
2810.78.85.182/3110.78.85.182 – 10.78.85.18310.78.85.183
2910.78.85.184/3110.78.85.184 – 10.78.85.18510.78.85.185
3010.78.85.186/3110.78.85.186 – 10.78.85.18710.78.85.187
3110.78.85.188/3110.78.85.188 – 10.78.85.18910.78.85.189
3210.78.85.190/3110.78.85.190 – 10.78.85.19110.78.85.191
3310.78.85.192/3110.78.85.192 – 10.78.85.19310.78.85.193
3410.78.85.194/3110.78.85.194 – 10.78.85.19510.78.85.195
3510.78.85.196/3110.78.85.196 – 10.78.85.19710.78.85.197
3610.78.85.198/3110.78.85.198 – 10.78.85.19910.78.85.199
3710.78.85.200/3110.78.85.200 – 10.78.85.20110.78.85.201
3810.78.85.202/3110.78.85.202 – 10.78.85.20310.78.85.203
3910.78.85.204/3110.78.85.204 – 10.78.85.20510.78.85.205
4010.78.85.206/3110.78.85.206 – 10.78.85.20710.78.85.207
4110.78.85.208/3110.78.85.208 – 10.78.85.20910.78.85.209
4210.78.85.210/3110.78.85.210 – 10.78.85.21110.78.85.211
4310.78.85.212/3110.78.85.212 – 10.78.85.21310.78.85.213
4410.78.85.214/3110.78.85.214 – 10.78.85.21510.78.85.215
4510.78.85.216/3110.78.85.216 – 10.78.85.21710.78.85.217
4610.78.85.218/3110.78.85.218 – 10.78.85.21910.78.85.219
4710.78.85.220/3110.78.85.220 – 10.78.85.22110.78.85.221
4810.78.85.222/3110.78.85.222 – 10.78.85.22310.78.85.223
4910.78.85.224/3110.78.85.224 – 10.78.85.22510.78.85.225
5010.78.85.226/3110.78.85.226 – 10.78.85.22710.78.85.227
5110.78.85.228/3110.78.85.228 – 10.78.85.22910.78.85.229
5210.78.85.230/3110.78.85.230 – 10.78.85.23110.78.85.231
5310.78.85.232/3110.78.85.232 – 10.78.85.23310.78.85.233
5410.78.85.234/3110.78.85.234 – 10.78.85.23510.78.85.235
5510.78.85.236/3110.78.85.236 – 10.78.85.23710.78.85.237
5610.78.85.238/3110.78.85.238 – 10.78.85.23910.78.85.239
5710.78.85.240/3110.78.85.240 – 10.78.85.24110.78.85.241
5810.78.85.242/3110.78.85.242 – 10.78.85.24310.78.85.243
5910.78.85.244/3110.78.85.244 – 10.78.85.24510.78.85.245
6010.78.85.246/3110.78.85.246 – 10.78.85.24710.78.85.247
6110.78.85.248/3110.78.85.248 – 10.78.85.24910.78.85.249
6210.78.85.250/3110.78.85.250 – 10.78.85.25110.78.85.251
6310.78.85.252/3110.78.85.252 – 10.78.85.25310.78.85.253
6410.78.85.254/3110.78.85.254 – 10.78.85.25510.78.85.255
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 →