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)10.80.123.128/25
network10.80.123.128/25
broadcast10.80.123.255
first host10.80.123.129
last host10.80.123.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.80.123.128/25
address00001010.01010000.01111011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01010000.01111011.10000000
broadcast00001010.01010000.01111011.11111111
green = network part, grey = host part
hex0x0a507b80
decimal173046656
reverse dns128.123.80.10.in-addr.arpa
ipv4-mapped::ffff:a50:7b80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.80.123.128/3110.80.123.128 – 10.80.123.12910.80.123.129
210.80.123.130/3110.80.123.130 – 10.80.123.13110.80.123.131
310.80.123.132/3110.80.123.132 – 10.80.123.13310.80.123.133
410.80.123.134/3110.80.123.134 – 10.80.123.13510.80.123.135
510.80.123.136/3110.80.123.136 – 10.80.123.13710.80.123.137
610.80.123.138/3110.80.123.138 – 10.80.123.13910.80.123.139
710.80.123.140/3110.80.123.140 – 10.80.123.14110.80.123.141
810.80.123.142/3110.80.123.142 – 10.80.123.14310.80.123.143
910.80.123.144/3110.80.123.144 – 10.80.123.14510.80.123.145
1010.80.123.146/3110.80.123.146 – 10.80.123.14710.80.123.147
1110.80.123.148/3110.80.123.148 – 10.80.123.14910.80.123.149
1210.80.123.150/3110.80.123.150 – 10.80.123.15110.80.123.151
1310.80.123.152/3110.80.123.152 – 10.80.123.15310.80.123.153
1410.80.123.154/3110.80.123.154 – 10.80.123.15510.80.123.155
1510.80.123.156/3110.80.123.156 – 10.80.123.15710.80.123.157
1610.80.123.158/3110.80.123.158 – 10.80.123.15910.80.123.159
1710.80.123.160/3110.80.123.160 – 10.80.123.16110.80.123.161
1810.80.123.162/3110.80.123.162 – 10.80.123.16310.80.123.163
1910.80.123.164/3110.80.123.164 – 10.80.123.16510.80.123.165
2010.80.123.166/3110.80.123.166 – 10.80.123.16710.80.123.167
2110.80.123.168/3110.80.123.168 – 10.80.123.16910.80.123.169
2210.80.123.170/3110.80.123.170 – 10.80.123.17110.80.123.171
2310.80.123.172/3110.80.123.172 – 10.80.123.17310.80.123.173
2410.80.123.174/3110.80.123.174 – 10.80.123.17510.80.123.175
2510.80.123.176/3110.80.123.176 – 10.80.123.17710.80.123.177
2610.80.123.178/3110.80.123.178 – 10.80.123.17910.80.123.179
2710.80.123.180/3110.80.123.180 – 10.80.123.18110.80.123.181
2810.80.123.182/3110.80.123.182 – 10.80.123.18310.80.123.183
2910.80.123.184/3110.80.123.184 – 10.80.123.18510.80.123.185
3010.80.123.186/3110.80.123.186 – 10.80.123.18710.80.123.187
3110.80.123.188/3110.80.123.188 – 10.80.123.18910.80.123.189
3210.80.123.190/3110.80.123.190 – 10.80.123.19110.80.123.191
3310.80.123.192/3110.80.123.192 – 10.80.123.19310.80.123.193
3410.80.123.194/3110.80.123.194 – 10.80.123.19510.80.123.195
3510.80.123.196/3110.80.123.196 – 10.80.123.19710.80.123.197
3610.80.123.198/3110.80.123.198 – 10.80.123.19910.80.123.199
3710.80.123.200/3110.80.123.200 – 10.80.123.20110.80.123.201
3810.80.123.202/3110.80.123.202 – 10.80.123.20310.80.123.203
3910.80.123.204/3110.80.123.204 – 10.80.123.20510.80.123.205
4010.80.123.206/3110.80.123.206 – 10.80.123.20710.80.123.207
4110.80.123.208/3110.80.123.208 – 10.80.123.20910.80.123.209
4210.80.123.210/3110.80.123.210 – 10.80.123.21110.80.123.211
4310.80.123.212/3110.80.123.212 – 10.80.123.21310.80.123.213
4410.80.123.214/3110.80.123.214 – 10.80.123.21510.80.123.215
4510.80.123.216/3110.80.123.216 – 10.80.123.21710.80.123.217
4610.80.123.218/3110.80.123.218 – 10.80.123.21910.80.123.219
4710.80.123.220/3110.80.123.220 – 10.80.123.22110.80.123.221
4810.80.123.222/3110.80.123.222 – 10.80.123.22310.80.123.223
4910.80.123.224/3110.80.123.224 – 10.80.123.22510.80.123.225
5010.80.123.226/3110.80.123.226 – 10.80.123.22710.80.123.227
5110.80.123.228/3110.80.123.228 – 10.80.123.22910.80.123.229
5210.80.123.230/3110.80.123.230 – 10.80.123.23110.80.123.231
5310.80.123.232/3110.80.123.232 – 10.80.123.23310.80.123.233
5410.80.123.234/3110.80.123.234 – 10.80.123.23510.80.123.235
5510.80.123.236/3110.80.123.236 – 10.80.123.23710.80.123.237
5610.80.123.238/3110.80.123.238 – 10.80.123.23910.80.123.239
5710.80.123.240/3110.80.123.240 – 10.80.123.24110.80.123.241
5810.80.123.242/3110.80.123.242 – 10.80.123.24310.80.123.243
5910.80.123.244/3110.80.123.244 – 10.80.123.24510.80.123.245
6010.80.123.246/3110.80.123.246 – 10.80.123.24710.80.123.247
6110.80.123.248/3110.80.123.248 – 10.80.123.24910.80.123.249
6210.80.123.250/3110.80.123.250 – 10.80.123.25110.80.123.251
6310.80.123.252/3110.80.123.252 – 10.80.123.25310.80.123.253
6410.80.123.254/3110.80.123.254 – 10.80.123.25510.80.123.255
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 →