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)10.167.40.128/25
network10.167.40.128/25
broadcast10.167.40.255
first host10.167.40.129
last host10.167.40.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.40.128/25
address00001010.10100111.00101000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.00101000.10000000
broadcast00001010.10100111.00101000.11111111
green = network part, grey = host part
hex0x0aa72880
decimal178727040
reverse dns128.40.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:2880

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.40.128/3110.167.40.128 – 10.167.40.12910.167.40.129
210.167.40.130/3110.167.40.130 – 10.167.40.13110.167.40.131
310.167.40.132/3110.167.40.132 – 10.167.40.13310.167.40.133
410.167.40.134/3110.167.40.134 – 10.167.40.13510.167.40.135
510.167.40.136/3110.167.40.136 – 10.167.40.13710.167.40.137
610.167.40.138/3110.167.40.138 – 10.167.40.13910.167.40.139
710.167.40.140/3110.167.40.140 – 10.167.40.14110.167.40.141
810.167.40.142/3110.167.40.142 – 10.167.40.14310.167.40.143
910.167.40.144/3110.167.40.144 – 10.167.40.14510.167.40.145
1010.167.40.146/3110.167.40.146 – 10.167.40.14710.167.40.147
1110.167.40.148/3110.167.40.148 – 10.167.40.14910.167.40.149
1210.167.40.150/3110.167.40.150 – 10.167.40.15110.167.40.151
1310.167.40.152/3110.167.40.152 – 10.167.40.15310.167.40.153
1410.167.40.154/3110.167.40.154 – 10.167.40.15510.167.40.155
1510.167.40.156/3110.167.40.156 – 10.167.40.15710.167.40.157
1610.167.40.158/3110.167.40.158 – 10.167.40.15910.167.40.159
1710.167.40.160/3110.167.40.160 – 10.167.40.16110.167.40.161
1810.167.40.162/3110.167.40.162 – 10.167.40.16310.167.40.163
1910.167.40.164/3110.167.40.164 – 10.167.40.16510.167.40.165
2010.167.40.166/3110.167.40.166 – 10.167.40.16710.167.40.167
2110.167.40.168/3110.167.40.168 – 10.167.40.16910.167.40.169
2210.167.40.170/3110.167.40.170 – 10.167.40.17110.167.40.171
2310.167.40.172/3110.167.40.172 – 10.167.40.17310.167.40.173
2410.167.40.174/3110.167.40.174 – 10.167.40.17510.167.40.175
2510.167.40.176/3110.167.40.176 – 10.167.40.17710.167.40.177
2610.167.40.178/3110.167.40.178 – 10.167.40.17910.167.40.179
2710.167.40.180/3110.167.40.180 – 10.167.40.18110.167.40.181
2810.167.40.182/3110.167.40.182 – 10.167.40.18310.167.40.183
2910.167.40.184/3110.167.40.184 – 10.167.40.18510.167.40.185
3010.167.40.186/3110.167.40.186 – 10.167.40.18710.167.40.187
3110.167.40.188/3110.167.40.188 – 10.167.40.18910.167.40.189
3210.167.40.190/3110.167.40.190 – 10.167.40.19110.167.40.191
3310.167.40.192/3110.167.40.192 – 10.167.40.19310.167.40.193
3410.167.40.194/3110.167.40.194 – 10.167.40.19510.167.40.195
3510.167.40.196/3110.167.40.196 – 10.167.40.19710.167.40.197
3610.167.40.198/3110.167.40.198 – 10.167.40.19910.167.40.199
3710.167.40.200/3110.167.40.200 – 10.167.40.20110.167.40.201
3810.167.40.202/3110.167.40.202 – 10.167.40.20310.167.40.203
3910.167.40.204/3110.167.40.204 – 10.167.40.20510.167.40.205
4010.167.40.206/3110.167.40.206 – 10.167.40.20710.167.40.207
4110.167.40.208/3110.167.40.208 – 10.167.40.20910.167.40.209
4210.167.40.210/3110.167.40.210 – 10.167.40.21110.167.40.211
4310.167.40.212/3110.167.40.212 – 10.167.40.21310.167.40.213
4410.167.40.214/3110.167.40.214 – 10.167.40.21510.167.40.215
4510.167.40.216/3110.167.40.216 – 10.167.40.21710.167.40.217
4610.167.40.218/3110.167.40.218 – 10.167.40.21910.167.40.219
4710.167.40.220/3110.167.40.220 – 10.167.40.22110.167.40.221
4810.167.40.222/3110.167.40.222 – 10.167.40.22310.167.40.223
4910.167.40.224/3110.167.40.224 – 10.167.40.22510.167.40.225
5010.167.40.226/3110.167.40.226 – 10.167.40.22710.167.40.227
5110.167.40.228/3110.167.40.228 – 10.167.40.22910.167.40.229
5210.167.40.230/3110.167.40.230 – 10.167.40.23110.167.40.231
5310.167.40.232/3110.167.40.232 – 10.167.40.23310.167.40.233
5410.167.40.234/3110.167.40.234 – 10.167.40.23510.167.40.235
5510.167.40.236/3110.167.40.236 – 10.167.40.23710.167.40.237
5610.167.40.238/3110.167.40.238 – 10.167.40.23910.167.40.239
5710.167.40.240/3110.167.40.240 – 10.167.40.24110.167.40.241
5810.167.40.242/3110.167.40.242 – 10.167.40.24310.167.40.243
5910.167.40.244/3110.167.40.244 – 10.167.40.24510.167.40.245
6010.167.40.246/3110.167.40.246 – 10.167.40.24710.167.40.247
6110.167.40.248/3110.167.40.248 – 10.167.40.24910.167.40.249
6210.167.40.250/3110.167.40.250 – 10.167.40.25110.167.40.251
6310.167.40.252/3110.167.40.252 – 10.167.40.25310.167.40.253
6410.167.40.254/3110.167.40.254 – 10.167.40.25510.167.40.255
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 →