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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)10.187.167.128/25
network10.187.167.128/25
broadcast10.187.167.255
first host10.187.167.129
last host10.187.167.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.187.167.128/25
address00001010.10111011.10100111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10111011.10100111.10000000
broadcast00001010.10111011.10100111.11111111
green = network part, grey = host part
hex0x0abba780
decimal180070272
reverse dns128.167.187.10.in-addr.arpa
ipv4-mapped::ffff:abb:a780

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.187.167.128/3110.187.167.128 – 10.187.167.12910.187.167.129
210.187.167.130/3110.187.167.130 – 10.187.167.13110.187.167.131
310.187.167.132/3110.187.167.132 – 10.187.167.13310.187.167.133
410.187.167.134/3110.187.167.134 – 10.187.167.13510.187.167.135
510.187.167.136/3110.187.167.136 – 10.187.167.13710.187.167.137
610.187.167.138/3110.187.167.138 – 10.187.167.13910.187.167.139
710.187.167.140/3110.187.167.140 – 10.187.167.14110.187.167.141
810.187.167.142/3110.187.167.142 – 10.187.167.14310.187.167.143
910.187.167.144/3110.187.167.144 – 10.187.167.14510.187.167.145
1010.187.167.146/3110.187.167.146 – 10.187.167.14710.187.167.147
1110.187.167.148/3110.187.167.148 – 10.187.167.14910.187.167.149
1210.187.167.150/3110.187.167.150 – 10.187.167.15110.187.167.151
1310.187.167.152/3110.187.167.152 – 10.187.167.15310.187.167.153
1410.187.167.154/3110.187.167.154 – 10.187.167.15510.187.167.155
1510.187.167.156/3110.187.167.156 – 10.187.167.15710.187.167.157
1610.187.167.158/3110.187.167.158 – 10.187.167.15910.187.167.159
1710.187.167.160/3110.187.167.160 – 10.187.167.16110.187.167.161
1810.187.167.162/3110.187.167.162 – 10.187.167.16310.187.167.163
1910.187.167.164/3110.187.167.164 – 10.187.167.16510.187.167.165
2010.187.167.166/3110.187.167.166 – 10.187.167.16710.187.167.167
2110.187.167.168/3110.187.167.168 – 10.187.167.16910.187.167.169
2210.187.167.170/3110.187.167.170 – 10.187.167.17110.187.167.171
2310.187.167.172/3110.187.167.172 – 10.187.167.17310.187.167.173
2410.187.167.174/3110.187.167.174 – 10.187.167.17510.187.167.175
2510.187.167.176/3110.187.167.176 – 10.187.167.17710.187.167.177
2610.187.167.178/3110.187.167.178 – 10.187.167.17910.187.167.179
2710.187.167.180/3110.187.167.180 – 10.187.167.18110.187.167.181
2810.187.167.182/3110.187.167.182 – 10.187.167.18310.187.167.183
2910.187.167.184/3110.187.167.184 – 10.187.167.18510.187.167.185
3010.187.167.186/3110.187.167.186 – 10.187.167.18710.187.167.187
3110.187.167.188/3110.187.167.188 – 10.187.167.18910.187.167.189
3210.187.167.190/3110.187.167.190 – 10.187.167.19110.187.167.191
3310.187.167.192/3110.187.167.192 – 10.187.167.19310.187.167.193
3410.187.167.194/3110.187.167.194 – 10.187.167.19510.187.167.195
3510.187.167.196/3110.187.167.196 – 10.187.167.19710.187.167.197
3610.187.167.198/3110.187.167.198 – 10.187.167.19910.187.167.199
3710.187.167.200/3110.187.167.200 – 10.187.167.20110.187.167.201
3810.187.167.202/3110.187.167.202 – 10.187.167.20310.187.167.203
3910.187.167.204/3110.187.167.204 – 10.187.167.20510.187.167.205
4010.187.167.206/3110.187.167.206 – 10.187.167.20710.187.167.207
4110.187.167.208/3110.187.167.208 – 10.187.167.20910.187.167.209
4210.187.167.210/3110.187.167.210 – 10.187.167.21110.187.167.211
4310.187.167.212/3110.187.167.212 – 10.187.167.21310.187.167.213
4410.187.167.214/3110.187.167.214 – 10.187.167.21510.187.167.215
4510.187.167.216/3110.187.167.216 – 10.187.167.21710.187.167.217
4610.187.167.218/3110.187.167.218 – 10.187.167.21910.187.167.219
4710.187.167.220/3110.187.167.220 – 10.187.167.22110.187.167.221
4810.187.167.222/3110.187.167.222 – 10.187.167.22310.187.167.223
4910.187.167.224/3110.187.167.224 – 10.187.167.22510.187.167.225
5010.187.167.226/3110.187.167.226 – 10.187.167.22710.187.167.227
5110.187.167.228/3110.187.167.228 – 10.187.167.22910.187.167.229
5210.187.167.230/3110.187.167.230 – 10.187.167.23110.187.167.231
5310.187.167.232/3110.187.167.232 – 10.187.167.23310.187.167.233
5410.187.167.234/3110.187.167.234 – 10.187.167.23510.187.167.235
5510.187.167.236/3110.187.167.236 – 10.187.167.23710.187.167.237
5610.187.167.238/3110.187.167.238 – 10.187.167.23910.187.167.239
5710.187.167.240/3110.187.167.240 – 10.187.167.24110.187.167.241
5810.187.167.242/3110.187.167.242 – 10.187.167.24310.187.167.243
5910.187.167.244/3110.187.167.244 – 10.187.167.24510.187.167.245
6010.187.167.246/3110.187.167.246 – 10.187.167.24710.187.167.247
6110.187.167.248/3110.187.167.248 – 10.187.167.24910.187.167.249
6210.187.167.250/3110.187.167.250 – 10.187.167.25110.187.167.251
6310.187.167.252/3110.187.167.252 – 10.187.167.25310.187.167.253
6410.187.167.254/3110.187.167.254 – 10.187.167.25510.187.167.255
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 →