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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)10.167.136.128/25
network10.167.136.128/25
broadcast10.167.136.255
first host10.167.136.129
last host10.167.136.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.136.128/25
address00001010.10100111.10001000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.10001000.10000000
broadcast00001010.10100111.10001000.11111111
green = network part, grey = host part
hex0x0aa78880
decimal178751616
reverse dns128.136.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:8880

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.136.128/3110.167.136.128 – 10.167.136.12910.167.136.129
210.167.136.130/3110.167.136.130 – 10.167.136.13110.167.136.131
310.167.136.132/3110.167.136.132 – 10.167.136.13310.167.136.133
410.167.136.134/3110.167.136.134 – 10.167.136.13510.167.136.135
510.167.136.136/3110.167.136.136 – 10.167.136.13710.167.136.137
610.167.136.138/3110.167.136.138 – 10.167.136.13910.167.136.139
710.167.136.140/3110.167.136.140 – 10.167.136.14110.167.136.141
810.167.136.142/3110.167.136.142 – 10.167.136.14310.167.136.143
910.167.136.144/3110.167.136.144 – 10.167.136.14510.167.136.145
1010.167.136.146/3110.167.136.146 – 10.167.136.14710.167.136.147
1110.167.136.148/3110.167.136.148 – 10.167.136.14910.167.136.149
1210.167.136.150/3110.167.136.150 – 10.167.136.15110.167.136.151
1310.167.136.152/3110.167.136.152 – 10.167.136.15310.167.136.153
1410.167.136.154/3110.167.136.154 – 10.167.136.15510.167.136.155
1510.167.136.156/3110.167.136.156 – 10.167.136.15710.167.136.157
1610.167.136.158/3110.167.136.158 – 10.167.136.15910.167.136.159
1710.167.136.160/3110.167.136.160 – 10.167.136.16110.167.136.161
1810.167.136.162/3110.167.136.162 – 10.167.136.16310.167.136.163
1910.167.136.164/3110.167.136.164 – 10.167.136.16510.167.136.165
2010.167.136.166/3110.167.136.166 – 10.167.136.16710.167.136.167
2110.167.136.168/3110.167.136.168 – 10.167.136.16910.167.136.169
2210.167.136.170/3110.167.136.170 – 10.167.136.17110.167.136.171
2310.167.136.172/3110.167.136.172 – 10.167.136.17310.167.136.173
2410.167.136.174/3110.167.136.174 – 10.167.136.17510.167.136.175
2510.167.136.176/3110.167.136.176 – 10.167.136.17710.167.136.177
2610.167.136.178/3110.167.136.178 – 10.167.136.17910.167.136.179
2710.167.136.180/3110.167.136.180 – 10.167.136.18110.167.136.181
2810.167.136.182/3110.167.136.182 – 10.167.136.18310.167.136.183
2910.167.136.184/3110.167.136.184 – 10.167.136.18510.167.136.185
3010.167.136.186/3110.167.136.186 – 10.167.136.18710.167.136.187
3110.167.136.188/3110.167.136.188 – 10.167.136.18910.167.136.189
3210.167.136.190/3110.167.136.190 – 10.167.136.19110.167.136.191
3310.167.136.192/3110.167.136.192 – 10.167.136.19310.167.136.193
3410.167.136.194/3110.167.136.194 – 10.167.136.19510.167.136.195
3510.167.136.196/3110.167.136.196 – 10.167.136.19710.167.136.197
3610.167.136.198/3110.167.136.198 – 10.167.136.19910.167.136.199
3710.167.136.200/3110.167.136.200 – 10.167.136.20110.167.136.201
3810.167.136.202/3110.167.136.202 – 10.167.136.20310.167.136.203
3910.167.136.204/3110.167.136.204 – 10.167.136.20510.167.136.205
4010.167.136.206/3110.167.136.206 – 10.167.136.20710.167.136.207
4110.167.136.208/3110.167.136.208 – 10.167.136.20910.167.136.209
4210.167.136.210/3110.167.136.210 – 10.167.136.21110.167.136.211
4310.167.136.212/3110.167.136.212 – 10.167.136.21310.167.136.213
4410.167.136.214/3110.167.136.214 – 10.167.136.21510.167.136.215
4510.167.136.216/3110.167.136.216 – 10.167.136.21710.167.136.217
4610.167.136.218/3110.167.136.218 – 10.167.136.21910.167.136.219
4710.167.136.220/3110.167.136.220 – 10.167.136.22110.167.136.221
4810.167.136.222/3110.167.136.222 – 10.167.136.22310.167.136.223
4910.167.136.224/3110.167.136.224 – 10.167.136.22510.167.136.225
5010.167.136.226/3110.167.136.226 – 10.167.136.22710.167.136.227
5110.167.136.228/3110.167.136.228 – 10.167.136.22910.167.136.229
5210.167.136.230/3110.167.136.230 – 10.167.136.23110.167.136.231
5310.167.136.232/3110.167.136.232 – 10.167.136.23310.167.136.233
5410.167.136.234/3110.167.136.234 – 10.167.136.23510.167.136.235
5510.167.136.236/3110.167.136.236 – 10.167.136.23710.167.136.237
5610.167.136.238/3110.167.136.238 – 10.167.136.23910.167.136.239
5710.167.136.240/3110.167.136.240 – 10.167.136.24110.167.136.241
5810.167.136.242/3110.167.136.242 – 10.167.136.24310.167.136.243
5910.167.136.244/3110.167.136.244 – 10.167.136.24510.167.136.245
6010.167.136.246/3110.167.136.246 – 10.167.136.24710.167.136.247
6110.167.136.248/3110.167.136.248 – 10.167.136.24910.167.136.249
6210.167.136.250/3110.167.136.250 – 10.167.136.25110.167.136.251
6310.167.136.252/3110.167.136.252 – 10.167.136.25310.167.136.253
6410.167.136.254/3110.167.136.254 – 10.167.136.25510.167.136.255
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 →