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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)10.167.225.128/25
network10.167.225.128/25
broadcast10.167.225.255
first host10.167.225.129
last host10.167.225.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.225.128/25
address00001010.10100111.11100001.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11100001.10000000
broadcast00001010.10100111.11100001.11111111
green = network part, grey = host part
hex0x0aa7e180
decimal178774400
reverse dns128.225.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:e180

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.225.128/3110.167.225.128 – 10.167.225.12910.167.225.129
210.167.225.130/3110.167.225.130 – 10.167.225.13110.167.225.131
310.167.225.132/3110.167.225.132 – 10.167.225.13310.167.225.133
410.167.225.134/3110.167.225.134 – 10.167.225.13510.167.225.135
510.167.225.136/3110.167.225.136 – 10.167.225.13710.167.225.137
610.167.225.138/3110.167.225.138 – 10.167.225.13910.167.225.139
710.167.225.140/3110.167.225.140 – 10.167.225.14110.167.225.141
810.167.225.142/3110.167.225.142 – 10.167.225.14310.167.225.143
910.167.225.144/3110.167.225.144 – 10.167.225.14510.167.225.145
1010.167.225.146/3110.167.225.146 – 10.167.225.14710.167.225.147
1110.167.225.148/3110.167.225.148 – 10.167.225.14910.167.225.149
1210.167.225.150/3110.167.225.150 – 10.167.225.15110.167.225.151
1310.167.225.152/3110.167.225.152 – 10.167.225.15310.167.225.153
1410.167.225.154/3110.167.225.154 – 10.167.225.15510.167.225.155
1510.167.225.156/3110.167.225.156 – 10.167.225.15710.167.225.157
1610.167.225.158/3110.167.225.158 – 10.167.225.15910.167.225.159
1710.167.225.160/3110.167.225.160 – 10.167.225.16110.167.225.161
1810.167.225.162/3110.167.225.162 – 10.167.225.16310.167.225.163
1910.167.225.164/3110.167.225.164 – 10.167.225.16510.167.225.165
2010.167.225.166/3110.167.225.166 – 10.167.225.16710.167.225.167
2110.167.225.168/3110.167.225.168 – 10.167.225.16910.167.225.169
2210.167.225.170/3110.167.225.170 – 10.167.225.17110.167.225.171
2310.167.225.172/3110.167.225.172 – 10.167.225.17310.167.225.173
2410.167.225.174/3110.167.225.174 – 10.167.225.17510.167.225.175
2510.167.225.176/3110.167.225.176 – 10.167.225.17710.167.225.177
2610.167.225.178/3110.167.225.178 – 10.167.225.17910.167.225.179
2710.167.225.180/3110.167.225.180 – 10.167.225.18110.167.225.181
2810.167.225.182/3110.167.225.182 – 10.167.225.18310.167.225.183
2910.167.225.184/3110.167.225.184 – 10.167.225.18510.167.225.185
3010.167.225.186/3110.167.225.186 – 10.167.225.18710.167.225.187
3110.167.225.188/3110.167.225.188 – 10.167.225.18910.167.225.189
3210.167.225.190/3110.167.225.190 – 10.167.225.19110.167.225.191
3310.167.225.192/3110.167.225.192 – 10.167.225.19310.167.225.193
3410.167.225.194/3110.167.225.194 – 10.167.225.19510.167.225.195
3510.167.225.196/3110.167.225.196 – 10.167.225.19710.167.225.197
3610.167.225.198/3110.167.225.198 – 10.167.225.19910.167.225.199
3710.167.225.200/3110.167.225.200 – 10.167.225.20110.167.225.201
3810.167.225.202/3110.167.225.202 – 10.167.225.20310.167.225.203
3910.167.225.204/3110.167.225.204 – 10.167.225.20510.167.225.205
4010.167.225.206/3110.167.225.206 – 10.167.225.20710.167.225.207
4110.167.225.208/3110.167.225.208 – 10.167.225.20910.167.225.209
4210.167.225.210/3110.167.225.210 – 10.167.225.21110.167.225.211
4310.167.225.212/3110.167.225.212 – 10.167.225.21310.167.225.213
4410.167.225.214/3110.167.225.214 – 10.167.225.21510.167.225.215
4510.167.225.216/3110.167.225.216 – 10.167.225.21710.167.225.217
4610.167.225.218/3110.167.225.218 – 10.167.225.21910.167.225.219
4710.167.225.220/3110.167.225.220 – 10.167.225.22110.167.225.221
4810.167.225.222/3110.167.225.222 – 10.167.225.22310.167.225.223
4910.167.225.224/3110.167.225.224 – 10.167.225.22510.167.225.225
5010.167.225.226/3110.167.225.226 – 10.167.225.22710.167.225.227
5110.167.225.228/3110.167.225.228 – 10.167.225.22910.167.225.229
5210.167.225.230/3110.167.225.230 – 10.167.225.23110.167.225.231
5310.167.225.232/3110.167.225.232 – 10.167.225.23310.167.225.233
5410.167.225.234/3110.167.225.234 – 10.167.225.23510.167.225.235
5510.167.225.236/3110.167.225.236 – 10.167.225.23710.167.225.237
5610.167.225.238/3110.167.225.238 – 10.167.225.23910.167.225.239
5710.167.225.240/3110.167.225.240 – 10.167.225.24110.167.225.241
5810.167.225.242/3110.167.225.242 – 10.167.225.24310.167.225.243
5910.167.225.244/3110.167.225.244 – 10.167.225.24510.167.225.245
6010.167.225.246/3110.167.225.246 – 10.167.225.24710.167.225.247
6110.167.225.248/3110.167.225.248 – 10.167.225.24910.167.225.249
6210.167.225.250/3110.167.225.250 – 10.167.225.25110.167.225.251
6310.167.225.252/3110.167.225.252 – 10.167.225.25310.167.225.253
6410.167.225.254/3110.167.225.254 – 10.167.225.25510.167.225.255
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 →