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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)10.167.192.128/25
network10.167.192.128/25
broadcast10.167.192.255
first host10.167.192.129
last host10.167.192.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.192.128/25
address00001010.10100111.11000000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11000000.10000000
broadcast00001010.10100111.11000000.11111111
green = network part, grey = host part
hex0x0aa7c080
decimal178765952
reverse dns128.192.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:c080

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.192.128/3110.167.192.128 – 10.167.192.12910.167.192.129
210.167.192.130/3110.167.192.130 – 10.167.192.13110.167.192.131
310.167.192.132/3110.167.192.132 – 10.167.192.13310.167.192.133
410.167.192.134/3110.167.192.134 – 10.167.192.13510.167.192.135
510.167.192.136/3110.167.192.136 – 10.167.192.13710.167.192.137
610.167.192.138/3110.167.192.138 – 10.167.192.13910.167.192.139
710.167.192.140/3110.167.192.140 – 10.167.192.14110.167.192.141
810.167.192.142/3110.167.192.142 – 10.167.192.14310.167.192.143
910.167.192.144/3110.167.192.144 – 10.167.192.14510.167.192.145
1010.167.192.146/3110.167.192.146 – 10.167.192.14710.167.192.147
1110.167.192.148/3110.167.192.148 – 10.167.192.14910.167.192.149
1210.167.192.150/3110.167.192.150 – 10.167.192.15110.167.192.151
1310.167.192.152/3110.167.192.152 – 10.167.192.15310.167.192.153
1410.167.192.154/3110.167.192.154 – 10.167.192.15510.167.192.155
1510.167.192.156/3110.167.192.156 – 10.167.192.15710.167.192.157
1610.167.192.158/3110.167.192.158 – 10.167.192.15910.167.192.159
1710.167.192.160/3110.167.192.160 – 10.167.192.16110.167.192.161
1810.167.192.162/3110.167.192.162 – 10.167.192.16310.167.192.163
1910.167.192.164/3110.167.192.164 – 10.167.192.16510.167.192.165
2010.167.192.166/3110.167.192.166 – 10.167.192.16710.167.192.167
2110.167.192.168/3110.167.192.168 – 10.167.192.16910.167.192.169
2210.167.192.170/3110.167.192.170 – 10.167.192.17110.167.192.171
2310.167.192.172/3110.167.192.172 – 10.167.192.17310.167.192.173
2410.167.192.174/3110.167.192.174 – 10.167.192.17510.167.192.175
2510.167.192.176/3110.167.192.176 – 10.167.192.17710.167.192.177
2610.167.192.178/3110.167.192.178 – 10.167.192.17910.167.192.179
2710.167.192.180/3110.167.192.180 – 10.167.192.18110.167.192.181
2810.167.192.182/3110.167.192.182 – 10.167.192.18310.167.192.183
2910.167.192.184/3110.167.192.184 – 10.167.192.18510.167.192.185
3010.167.192.186/3110.167.192.186 – 10.167.192.18710.167.192.187
3110.167.192.188/3110.167.192.188 – 10.167.192.18910.167.192.189
3210.167.192.190/3110.167.192.190 – 10.167.192.19110.167.192.191
3310.167.192.192/3110.167.192.192 – 10.167.192.19310.167.192.193
3410.167.192.194/3110.167.192.194 – 10.167.192.19510.167.192.195
3510.167.192.196/3110.167.192.196 – 10.167.192.19710.167.192.197
3610.167.192.198/3110.167.192.198 – 10.167.192.19910.167.192.199
3710.167.192.200/3110.167.192.200 – 10.167.192.20110.167.192.201
3810.167.192.202/3110.167.192.202 – 10.167.192.20310.167.192.203
3910.167.192.204/3110.167.192.204 – 10.167.192.20510.167.192.205
4010.167.192.206/3110.167.192.206 – 10.167.192.20710.167.192.207
4110.167.192.208/3110.167.192.208 – 10.167.192.20910.167.192.209
4210.167.192.210/3110.167.192.210 – 10.167.192.21110.167.192.211
4310.167.192.212/3110.167.192.212 – 10.167.192.21310.167.192.213
4410.167.192.214/3110.167.192.214 – 10.167.192.21510.167.192.215
4510.167.192.216/3110.167.192.216 – 10.167.192.21710.167.192.217
4610.167.192.218/3110.167.192.218 – 10.167.192.21910.167.192.219
4710.167.192.220/3110.167.192.220 – 10.167.192.22110.167.192.221
4810.167.192.222/3110.167.192.222 – 10.167.192.22310.167.192.223
4910.167.192.224/3110.167.192.224 – 10.167.192.22510.167.192.225
5010.167.192.226/3110.167.192.226 – 10.167.192.22710.167.192.227
5110.167.192.228/3110.167.192.228 – 10.167.192.22910.167.192.229
5210.167.192.230/3110.167.192.230 – 10.167.192.23110.167.192.231
5310.167.192.232/3110.167.192.232 – 10.167.192.23310.167.192.233
5410.167.192.234/3110.167.192.234 – 10.167.192.23510.167.192.235
5510.167.192.236/3110.167.192.236 – 10.167.192.23710.167.192.237
5610.167.192.238/3110.167.192.238 – 10.167.192.23910.167.192.239
5710.167.192.240/3110.167.192.240 – 10.167.192.24110.167.192.241
5810.167.192.242/3110.167.192.242 – 10.167.192.24310.167.192.243
5910.167.192.244/3110.167.192.244 – 10.167.192.24510.167.192.245
6010.167.192.246/3110.167.192.246 – 10.167.192.24710.167.192.247
6110.167.192.248/3110.167.192.248 – 10.167.192.24910.167.192.249
6210.167.192.250/3110.167.192.250 – 10.167.192.25110.167.192.251
6310.167.192.252/3110.167.192.252 – 10.167.192.25310.167.192.253
6410.167.192.254/3110.167.192.254 – 10.167.192.25510.167.192.255
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 →