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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)10.2.78.128/25
network10.2.78.128/25
broadcast10.2.78.255
first host10.2.78.129
last host10.2.78.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.78.128/25
address00001010.00000010.01001110.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01001110.10000000
broadcast00001010.00000010.01001110.11111111
green = network part, grey = host part
hex0x0a024e80
decimal167923328
reverse dns128.78.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:4e80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.78.128/3110.2.78.128 – 10.2.78.12910.2.78.129
210.2.78.130/3110.2.78.130 – 10.2.78.13110.2.78.131
310.2.78.132/3110.2.78.132 – 10.2.78.13310.2.78.133
410.2.78.134/3110.2.78.134 – 10.2.78.13510.2.78.135
510.2.78.136/3110.2.78.136 – 10.2.78.13710.2.78.137
610.2.78.138/3110.2.78.138 – 10.2.78.13910.2.78.139
710.2.78.140/3110.2.78.140 – 10.2.78.14110.2.78.141
810.2.78.142/3110.2.78.142 – 10.2.78.14310.2.78.143
910.2.78.144/3110.2.78.144 – 10.2.78.14510.2.78.145
1010.2.78.146/3110.2.78.146 – 10.2.78.14710.2.78.147
1110.2.78.148/3110.2.78.148 – 10.2.78.14910.2.78.149
1210.2.78.150/3110.2.78.150 – 10.2.78.15110.2.78.151
1310.2.78.152/3110.2.78.152 – 10.2.78.15310.2.78.153
1410.2.78.154/3110.2.78.154 – 10.2.78.15510.2.78.155
1510.2.78.156/3110.2.78.156 – 10.2.78.15710.2.78.157
1610.2.78.158/3110.2.78.158 – 10.2.78.15910.2.78.159
1710.2.78.160/3110.2.78.160 – 10.2.78.16110.2.78.161
1810.2.78.162/3110.2.78.162 – 10.2.78.16310.2.78.163
1910.2.78.164/3110.2.78.164 – 10.2.78.16510.2.78.165
2010.2.78.166/3110.2.78.166 – 10.2.78.16710.2.78.167
2110.2.78.168/3110.2.78.168 – 10.2.78.16910.2.78.169
2210.2.78.170/3110.2.78.170 – 10.2.78.17110.2.78.171
2310.2.78.172/3110.2.78.172 – 10.2.78.17310.2.78.173
2410.2.78.174/3110.2.78.174 – 10.2.78.17510.2.78.175
2510.2.78.176/3110.2.78.176 – 10.2.78.17710.2.78.177
2610.2.78.178/3110.2.78.178 – 10.2.78.17910.2.78.179
2710.2.78.180/3110.2.78.180 – 10.2.78.18110.2.78.181
2810.2.78.182/3110.2.78.182 – 10.2.78.18310.2.78.183
2910.2.78.184/3110.2.78.184 – 10.2.78.18510.2.78.185
3010.2.78.186/3110.2.78.186 – 10.2.78.18710.2.78.187
3110.2.78.188/3110.2.78.188 – 10.2.78.18910.2.78.189
3210.2.78.190/3110.2.78.190 – 10.2.78.19110.2.78.191
3310.2.78.192/3110.2.78.192 – 10.2.78.19310.2.78.193
3410.2.78.194/3110.2.78.194 – 10.2.78.19510.2.78.195
3510.2.78.196/3110.2.78.196 – 10.2.78.19710.2.78.197
3610.2.78.198/3110.2.78.198 – 10.2.78.19910.2.78.199
3710.2.78.200/3110.2.78.200 – 10.2.78.20110.2.78.201
3810.2.78.202/3110.2.78.202 – 10.2.78.20310.2.78.203
3910.2.78.204/3110.2.78.204 – 10.2.78.20510.2.78.205
4010.2.78.206/3110.2.78.206 – 10.2.78.20710.2.78.207
4110.2.78.208/3110.2.78.208 – 10.2.78.20910.2.78.209
4210.2.78.210/3110.2.78.210 – 10.2.78.21110.2.78.211
4310.2.78.212/3110.2.78.212 – 10.2.78.21310.2.78.213
4410.2.78.214/3110.2.78.214 – 10.2.78.21510.2.78.215
4510.2.78.216/3110.2.78.216 – 10.2.78.21710.2.78.217
4610.2.78.218/3110.2.78.218 – 10.2.78.21910.2.78.219
4710.2.78.220/3110.2.78.220 – 10.2.78.22110.2.78.221
4810.2.78.222/3110.2.78.222 – 10.2.78.22310.2.78.223
4910.2.78.224/3110.2.78.224 – 10.2.78.22510.2.78.225
5010.2.78.226/3110.2.78.226 – 10.2.78.22710.2.78.227
5110.2.78.228/3110.2.78.228 – 10.2.78.22910.2.78.229
5210.2.78.230/3110.2.78.230 – 10.2.78.23110.2.78.231
5310.2.78.232/3110.2.78.232 – 10.2.78.23310.2.78.233
5410.2.78.234/3110.2.78.234 – 10.2.78.23510.2.78.235
5510.2.78.236/3110.2.78.236 – 10.2.78.23710.2.78.237
5610.2.78.238/3110.2.78.238 – 10.2.78.23910.2.78.239
5710.2.78.240/3110.2.78.240 – 10.2.78.24110.2.78.241
5810.2.78.242/3110.2.78.242 – 10.2.78.24310.2.78.243
5910.2.78.244/3110.2.78.244 – 10.2.78.24510.2.78.245
6010.2.78.246/3110.2.78.246 – 10.2.78.24710.2.78.247
6110.2.78.248/3110.2.78.248 – 10.2.78.24910.2.78.249
6210.2.78.250/3110.2.78.250 – 10.2.78.25110.2.78.251
6310.2.78.252/3110.2.78.252 – 10.2.78.25310.2.78.253
6410.2.78.254/3110.2.78.254 – 10.2.78.25510.2.78.255
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 →