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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)10.167.97.128/25
network10.167.97.128/25
broadcast10.167.97.255
first host10.167.97.129
last host10.167.97.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.97.128/25
address00001010.10100111.01100001.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.01100001.10000000
broadcast00001010.10100111.01100001.11111111
green = network part, grey = host part
hex0x0aa76180
decimal178741632
reverse dns128.97.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:6180

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.97.128/3110.167.97.128 – 10.167.97.12910.167.97.129
210.167.97.130/3110.167.97.130 – 10.167.97.13110.167.97.131
310.167.97.132/3110.167.97.132 – 10.167.97.13310.167.97.133
410.167.97.134/3110.167.97.134 – 10.167.97.13510.167.97.135
510.167.97.136/3110.167.97.136 – 10.167.97.13710.167.97.137
610.167.97.138/3110.167.97.138 – 10.167.97.13910.167.97.139
710.167.97.140/3110.167.97.140 – 10.167.97.14110.167.97.141
810.167.97.142/3110.167.97.142 – 10.167.97.14310.167.97.143
910.167.97.144/3110.167.97.144 – 10.167.97.14510.167.97.145
1010.167.97.146/3110.167.97.146 – 10.167.97.14710.167.97.147
1110.167.97.148/3110.167.97.148 – 10.167.97.14910.167.97.149
1210.167.97.150/3110.167.97.150 – 10.167.97.15110.167.97.151
1310.167.97.152/3110.167.97.152 – 10.167.97.15310.167.97.153
1410.167.97.154/3110.167.97.154 – 10.167.97.15510.167.97.155
1510.167.97.156/3110.167.97.156 – 10.167.97.15710.167.97.157
1610.167.97.158/3110.167.97.158 – 10.167.97.15910.167.97.159
1710.167.97.160/3110.167.97.160 – 10.167.97.16110.167.97.161
1810.167.97.162/3110.167.97.162 – 10.167.97.16310.167.97.163
1910.167.97.164/3110.167.97.164 – 10.167.97.16510.167.97.165
2010.167.97.166/3110.167.97.166 – 10.167.97.16710.167.97.167
2110.167.97.168/3110.167.97.168 – 10.167.97.16910.167.97.169
2210.167.97.170/3110.167.97.170 – 10.167.97.17110.167.97.171
2310.167.97.172/3110.167.97.172 – 10.167.97.17310.167.97.173
2410.167.97.174/3110.167.97.174 – 10.167.97.17510.167.97.175
2510.167.97.176/3110.167.97.176 – 10.167.97.17710.167.97.177
2610.167.97.178/3110.167.97.178 – 10.167.97.17910.167.97.179
2710.167.97.180/3110.167.97.180 – 10.167.97.18110.167.97.181
2810.167.97.182/3110.167.97.182 – 10.167.97.18310.167.97.183
2910.167.97.184/3110.167.97.184 – 10.167.97.18510.167.97.185
3010.167.97.186/3110.167.97.186 – 10.167.97.18710.167.97.187
3110.167.97.188/3110.167.97.188 – 10.167.97.18910.167.97.189
3210.167.97.190/3110.167.97.190 – 10.167.97.19110.167.97.191
3310.167.97.192/3110.167.97.192 – 10.167.97.19310.167.97.193
3410.167.97.194/3110.167.97.194 – 10.167.97.19510.167.97.195
3510.167.97.196/3110.167.97.196 – 10.167.97.19710.167.97.197
3610.167.97.198/3110.167.97.198 – 10.167.97.19910.167.97.199
3710.167.97.200/3110.167.97.200 – 10.167.97.20110.167.97.201
3810.167.97.202/3110.167.97.202 – 10.167.97.20310.167.97.203
3910.167.97.204/3110.167.97.204 – 10.167.97.20510.167.97.205
4010.167.97.206/3110.167.97.206 – 10.167.97.20710.167.97.207
4110.167.97.208/3110.167.97.208 – 10.167.97.20910.167.97.209
4210.167.97.210/3110.167.97.210 – 10.167.97.21110.167.97.211
4310.167.97.212/3110.167.97.212 – 10.167.97.21310.167.97.213
4410.167.97.214/3110.167.97.214 – 10.167.97.21510.167.97.215
4510.167.97.216/3110.167.97.216 – 10.167.97.21710.167.97.217
4610.167.97.218/3110.167.97.218 – 10.167.97.21910.167.97.219
4710.167.97.220/3110.167.97.220 – 10.167.97.22110.167.97.221
4810.167.97.222/3110.167.97.222 – 10.167.97.22310.167.97.223
4910.167.97.224/3110.167.97.224 – 10.167.97.22510.167.97.225
5010.167.97.226/3110.167.97.226 – 10.167.97.22710.167.97.227
5110.167.97.228/3110.167.97.228 – 10.167.97.22910.167.97.229
5210.167.97.230/3110.167.97.230 – 10.167.97.23110.167.97.231
5310.167.97.232/3110.167.97.232 – 10.167.97.23310.167.97.233
5410.167.97.234/3110.167.97.234 – 10.167.97.23510.167.97.235
5510.167.97.236/3110.167.97.236 – 10.167.97.23710.167.97.237
5610.167.97.238/3110.167.97.238 – 10.167.97.23910.167.97.239
5710.167.97.240/3110.167.97.240 – 10.167.97.24110.167.97.241
5810.167.97.242/3110.167.97.242 – 10.167.97.24310.167.97.243
5910.167.97.244/3110.167.97.244 – 10.167.97.24510.167.97.245
6010.167.97.246/3110.167.97.246 – 10.167.97.24710.167.97.247
6110.167.97.248/3110.167.97.248 – 10.167.97.24910.167.97.249
6210.167.97.250/3110.167.97.250 – 10.167.97.25110.167.97.251
6310.167.97.252/3110.167.97.252 – 10.167.97.25310.167.97.253
6410.167.97.254/3110.167.97.254 – 10.167.97.25510.167.97.255
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 →