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)10.215.122.128/25
network10.215.122.128/25
broadcast10.215.122.255
first host10.215.122.129
last host10.215.122.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.215.122.128/25
address00001010.11010111.01111010.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.11010111.01111010.10000000
broadcast00001010.11010111.01111010.11111111
green = network part, grey = host part
hex0x0ad77a80
decimal181893760
reverse dns128.122.215.10.in-addr.arpa
ipv4-mapped::ffff:ad7:7a80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.215.122.128/3110.215.122.128 – 10.215.122.12910.215.122.129
210.215.122.130/3110.215.122.130 – 10.215.122.13110.215.122.131
310.215.122.132/3110.215.122.132 – 10.215.122.13310.215.122.133
410.215.122.134/3110.215.122.134 – 10.215.122.13510.215.122.135
510.215.122.136/3110.215.122.136 – 10.215.122.13710.215.122.137
610.215.122.138/3110.215.122.138 – 10.215.122.13910.215.122.139
710.215.122.140/3110.215.122.140 – 10.215.122.14110.215.122.141
810.215.122.142/3110.215.122.142 – 10.215.122.14310.215.122.143
910.215.122.144/3110.215.122.144 – 10.215.122.14510.215.122.145
1010.215.122.146/3110.215.122.146 – 10.215.122.14710.215.122.147
1110.215.122.148/3110.215.122.148 – 10.215.122.14910.215.122.149
1210.215.122.150/3110.215.122.150 – 10.215.122.15110.215.122.151
1310.215.122.152/3110.215.122.152 – 10.215.122.15310.215.122.153
1410.215.122.154/3110.215.122.154 – 10.215.122.15510.215.122.155
1510.215.122.156/3110.215.122.156 – 10.215.122.15710.215.122.157
1610.215.122.158/3110.215.122.158 – 10.215.122.15910.215.122.159
1710.215.122.160/3110.215.122.160 – 10.215.122.16110.215.122.161
1810.215.122.162/3110.215.122.162 – 10.215.122.16310.215.122.163
1910.215.122.164/3110.215.122.164 – 10.215.122.16510.215.122.165
2010.215.122.166/3110.215.122.166 – 10.215.122.16710.215.122.167
2110.215.122.168/3110.215.122.168 – 10.215.122.16910.215.122.169
2210.215.122.170/3110.215.122.170 – 10.215.122.17110.215.122.171
2310.215.122.172/3110.215.122.172 – 10.215.122.17310.215.122.173
2410.215.122.174/3110.215.122.174 – 10.215.122.17510.215.122.175
2510.215.122.176/3110.215.122.176 – 10.215.122.17710.215.122.177
2610.215.122.178/3110.215.122.178 – 10.215.122.17910.215.122.179
2710.215.122.180/3110.215.122.180 – 10.215.122.18110.215.122.181
2810.215.122.182/3110.215.122.182 – 10.215.122.18310.215.122.183
2910.215.122.184/3110.215.122.184 – 10.215.122.18510.215.122.185
3010.215.122.186/3110.215.122.186 – 10.215.122.18710.215.122.187
3110.215.122.188/3110.215.122.188 – 10.215.122.18910.215.122.189
3210.215.122.190/3110.215.122.190 – 10.215.122.19110.215.122.191
3310.215.122.192/3110.215.122.192 – 10.215.122.19310.215.122.193
3410.215.122.194/3110.215.122.194 – 10.215.122.19510.215.122.195
3510.215.122.196/3110.215.122.196 – 10.215.122.19710.215.122.197
3610.215.122.198/3110.215.122.198 – 10.215.122.19910.215.122.199
3710.215.122.200/3110.215.122.200 – 10.215.122.20110.215.122.201
3810.215.122.202/3110.215.122.202 – 10.215.122.20310.215.122.203
3910.215.122.204/3110.215.122.204 – 10.215.122.20510.215.122.205
4010.215.122.206/3110.215.122.206 – 10.215.122.20710.215.122.207
4110.215.122.208/3110.215.122.208 – 10.215.122.20910.215.122.209
4210.215.122.210/3110.215.122.210 – 10.215.122.21110.215.122.211
4310.215.122.212/3110.215.122.212 – 10.215.122.21310.215.122.213
4410.215.122.214/3110.215.122.214 – 10.215.122.21510.215.122.215
4510.215.122.216/3110.215.122.216 – 10.215.122.21710.215.122.217
4610.215.122.218/3110.215.122.218 – 10.215.122.21910.215.122.219
4710.215.122.220/3110.215.122.220 – 10.215.122.22110.215.122.221
4810.215.122.222/3110.215.122.222 – 10.215.122.22310.215.122.223
4910.215.122.224/3110.215.122.224 – 10.215.122.22510.215.122.225
5010.215.122.226/3110.215.122.226 – 10.215.122.22710.215.122.227
5110.215.122.228/3110.215.122.228 – 10.215.122.22910.215.122.229
5210.215.122.230/3110.215.122.230 – 10.215.122.23110.215.122.231
5310.215.122.232/3110.215.122.232 – 10.215.122.23310.215.122.233
5410.215.122.234/3110.215.122.234 – 10.215.122.23510.215.122.235
5510.215.122.236/3110.215.122.236 – 10.215.122.23710.215.122.237
5610.215.122.238/3110.215.122.238 – 10.215.122.23910.215.122.239
5710.215.122.240/3110.215.122.240 – 10.215.122.24110.215.122.241
5810.215.122.242/3110.215.122.242 – 10.215.122.24310.215.122.243
5910.215.122.244/3110.215.122.244 – 10.215.122.24510.215.122.245
6010.215.122.246/3110.215.122.246 – 10.215.122.24710.215.122.247
6110.215.122.248/3110.215.122.248 – 10.215.122.24910.215.122.249
6210.215.122.250/3110.215.122.250 – 10.215.122.25110.215.122.251
6310.215.122.252/3110.215.122.252 – 10.215.122.25310.215.122.253
6410.215.122.254/3110.215.122.254 – 10.215.122.25510.215.122.255
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 →