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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)10.167.238.128/25
network10.167.238.128/25
broadcast10.167.238.255
first host10.167.238.129
last host10.167.238.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.238.128/25
address00001010.10100111.11101110.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11101110.10000000
broadcast00001010.10100111.11101110.11111111
green = network part, grey = host part
hex0x0aa7ee80
decimal178777728
reverse dns128.238.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:ee80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.238.128/3110.167.238.128 – 10.167.238.12910.167.238.129
210.167.238.130/3110.167.238.130 – 10.167.238.13110.167.238.131
310.167.238.132/3110.167.238.132 – 10.167.238.13310.167.238.133
410.167.238.134/3110.167.238.134 – 10.167.238.13510.167.238.135
510.167.238.136/3110.167.238.136 – 10.167.238.13710.167.238.137
610.167.238.138/3110.167.238.138 – 10.167.238.13910.167.238.139
710.167.238.140/3110.167.238.140 – 10.167.238.14110.167.238.141
810.167.238.142/3110.167.238.142 – 10.167.238.14310.167.238.143
910.167.238.144/3110.167.238.144 – 10.167.238.14510.167.238.145
1010.167.238.146/3110.167.238.146 – 10.167.238.14710.167.238.147
1110.167.238.148/3110.167.238.148 – 10.167.238.14910.167.238.149
1210.167.238.150/3110.167.238.150 – 10.167.238.15110.167.238.151
1310.167.238.152/3110.167.238.152 – 10.167.238.15310.167.238.153
1410.167.238.154/3110.167.238.154 – 10.167.238.15510.167.238.155
1510.167.238.156/3110.167.238.156 – 10.167.238.15710.167.238.157
1610.167.238.158/3110.167.238.158 – 10.167.238.15910.167.238.159
1710.167.238.160/3110.167.238.160 – 10.167.238.16110.167.238.161
1810.167.238.162/3110.167.238.162 – 10.167.238.16310.167.238.163
1910.167.238.164/3110.167.238.164 – 10.167.238.16510.167.238.165
2010.167.238.166/3110.167.238.166 – 10.167.238.16710.167.238.167
2110.167.238.168/3110.167.238.168 – 10.167.238.16910.167.238.169
2210.167.238.170/3110.167.238.170 – 10.167.238.17110.167.238.171
2310.167.238.172/3110.167.238.172 – 10.167.238.17310.167.238.173
2410.167.238.174/3110.167.238.174 – 10.167.238.17510.167.238.175
2510.167.238.176/3110.167.238.176 – 10.167.238.17710.167.238.177
2610.167.238.178/3110.167.238.178 – 10.167.238.17910.167.238.179
2710.167.238.180/3110.167.238.180 – 10.167.238.18110.167.238.181
2810.167.238.182/3110.167.238.182 – 10.167.238.18310.167.238.183
2910.167.238.184/3110.167.238.184 – 10.167.238.18510.167.238.185
3010.167.238.186/3110.167.238.186 – 10.167.238.18710.167.238.187
3110.167.238.188/3110.167.238.188 – 10.167.238.18910.167.238.189
3210.167.238.190/3110.167.238.190 – 10.167.238.19110.167.238.191
3310.167.238.192/3110.167.238.192 – 10.167.238.19310.167.238.193
3410.167.238.194/3110.167.238.194 – 10.167.238.19510.167.238.195
3510.167.238.196/3110.167.238.196 – 10.167.238.19710.167.238.197
3610.167.238.198/3110.167.238.198 – 10.167.238.19910.167.238.199
3710.167.238.200/3110.167.238.200 – 10.167.238.20110.167.238.201
3810.167.238.202/3110.167.238.202 – 10.167.238.20310.167.238.203
3910.167.238.204/3110.167.238.204 – 10.167.238.20510.167.238.205
4010.167.238.206/3110.167.238.206 – 10.167.238.20710.167.238.207
4110.167.238.208/3110.167.238.208 – 10.167.238.20910.167.238.209
4210.167.238.210/3110.167.238.210 – 10.167.238.21110.167.238.211
4310.167.238.212/3110.167.238.212 – 10.167.238.21310.167.238.213
4410.167.238.214/3110.167.238.214 – 10.167.238.21510.167.238.215
4510.167.238.216/3110.167.238.216 – 10.167.238.21710.167.238.217
4610.167.238.218/3110.167.238.218 – 10.167.238.21910.167.238.219
4710.167.238.220/3110.167.238.220 – 10.167.238.22110.167.238.221
4810.167.238.222/3110.167.238.222 – 10.167.238.22310.167.238.223
4910.167.238.224/3110.167.238.224 – 10.167.238.22510.167.238.225
5010.167.238.226/3110.167.238.226 – 10.167.238.22710.167.238.227
5110.167.238.228/3110.167.238.228 – 10.167.238.22910.167.238.229
5210.167.238.230/3110.167.238.230 – 10.167.238.23110.167.238.231
5310.167.238.232/3110.167.238.232 – 10.167.238.23310.167.238.233
5410.167.238.234/3110.167.238.234 – 10.167.238.23510.167.238.235
5510.167.238.236/3110.167.238.236 – 10.167.238.23710.167.238.237
5610.167.238.238/3110.167.238.238 – 10.167.238.23910.167.238.239
5710.167.238.240/3110.167.238.240 – 10.167.238.24110.167.238.241
5810.167.238.242/3110.167.238.242 – 10.167.238.24310.167.238.243
5910.167.238.244/3110.167.238.244 – 10.167.238.24510.167.238.245
6010.167.238.246/3110.167.238.246 – 10.167.238.24710.167.238.247
6110.167.238.248/3110.167.238.248 – 10.167.238.24910.167.238.249
6210.167.238.250/3110.167.238.250 – 10.167.238.25110.167.238.251
6310.167.238.252/3110.167.238.252 – 10.167.238.25310.167.238.253
6410.167.238.254/3110.167.238.254 – 10.167.238.25510.167.238.255
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 →