ip
ipku.in

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)10.167.205.128/25
network10.167.205.128/25
broadcast10.167.205.255
first host10.167.205.129
last host10.167.205.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.205.128/25
address00001010.10100111.11001101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11001101.10000000
broadcast00001010.10100111.11001101.11111111
green = network part, grey = host part
hex0x0aa7cd80
decimal178769280
reverse dns128.205.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:cd80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.205.128/3110.167.205.128 – 10.167.205.12910.167.205.129
210.167.205.130/3110.167.205.130 – 10.167.205.13110.167.205.131
310.167.205.132/3110.167.205.132 – 10.167.205.13310.167.205.133
410.167.205.134/3110.167.205.134 – 10.167.205.13510.167.205.135
510.167.205.136/3110.167.205.136 – 10.167.205.13710.167.205.137
610.167.205.138/3110.167.205.138 – 10.167.205.13910.167.205.139
710.167.205.140/3110.167.205.140 – 10.167.205.14110.167.205.141
810.167.205.142/3110.167.205.142 – 10.167.205.14310.167.205.143
910.167.205.144/3110.167.205.144 – 10.167.205.14510.167.205.145
1010.167.205.146/3110.167.205.146 – 10.167.205.14710.167.205.147
1110.167.205.148/3110.167.205.148 – 10.167.205.14910.167.205.149
1210.167.205.150/3110.167.205.150 – 10.167.205.15110.167.205.151
1310.167.205.152/3110.167.205.152 – 10.167.205.15310.167.205.153
1410.167.205.154/3110.167.205.154 – 10.167.205.15510.167.205.155
1510.167.205.156/3110.167.205.156 – 10.167.205.15710.167.205.157
1610.167.205.158/3110.167.205.158 – 10.167.205.15910.167.205.159
1710.167.205.160/3110.167.205.160 – 10.167.205.16110.167.205.161
1810.167.205.162/3110.167.205.162 – 10.167.205.16310.167.205.163
1910.167.205.164/3110.167.205.164 – 10.167.205.16510.167.205.165
2010.167.205.166/3110.167.205.166 – 10.167.205.16710.167.205.167
2110.167.205.168/3110.167.205.168 – 10.167.205.16910.167.205.169
2210.167.205.170/3110.167.205.170 – 10.167.205.17110.167.205.171
2310.167.205.172/3110.167.205.172 – 10.167.205.17310.167.205.173
2410.167.205.174/3110.167.205.174 – 10.167.205.17510.167.205.175
2510.167.205.176/3110.167.205.176 – 10.167.205.17710.167.205.177
2610.167.205.178/3110.167.205.178 – 10.167.205.17910.167.205.179
2710.167.205.180/3110.167.205.180 – 10.167.205.18110.167.205.181
2810.167.205.182/3110.167.205.182 – 10.167.205.18310.167.205.183
2910.167.205.184/3110.167.205.184 – 10.167.205.18510.167.205.185
3010.167.205.186/3110.167.205.186 – 10.167.205.18710.167.205.187
3110.167.205.188/3110.167.205.188 – 10.167.205.18910.167.205.189
3210.167.205.190/3110.167.205.190 – 10.167.205.19110.167.205.191
3310.167.205.192/3110.167.205.192 – 10.167.205.19310.167.205.193
3410.167.205.194/3110.167.205.194 – 10.167.205.19510.167.205.195
3510.167.205.196/3110.167.205.196 – 10.167.205.19710.167.205.197
3610.167.205.198/3110.167.205.198 – 10.167.205.19910.167.205.199
3710.167.205.200/3110.167.205.200 – 10.167.205.20110.167.205.201
3810.167.205.202/3110.167.205.202 – 10.167.205.20310.167.205.203
3910.167.205.204/3110.167.205.204 – 10.167.205.20510.167.205.205
4010.167.205.206/3110.167.205.206 – 10.167.205.20710.167.205.207
4110.167.205.208/3110.167.205.208 – 10.167.205.20910.167.205.209
4210.167.205.210/3110.167.205.210 – 10.167.205.21110.167.205.211
4310.167.205.212/3110.167.205.212 – 10.167.205.21310.167.205.213
4410.167.205.214/3110.167.205.214 – 10.167.205.21510.167.205.215
4510.167.205.216/3110.167.205.216 – 10.167.205.21710.167.205.217
4610.167.205.218/3110.167.205.218 – 10.167.205.21910.167.205.219
4710.167.205.220/3110.167.205.220 – 10.167.205.22110.167.205.221
4810.167.205.222/3110.167.205.222 – 10.167.205.22310.167.205.223
4910.167.205.224/3110.167.205.224 – 10.167.205.22510.167.205.225
5010.167.205.226/3110.167.205.226 – 10.167.205.22710.167.205.227
5110.167.205.228/3110.167.205.228 – 10.167.205.22910.167.205.229
5210.167.205.230/3110.167.205.230 – 10.167.205.23110.167.205.231
5310.167.205.232/3110.167.205.232 – 10.167.205.23310.167.205.233
5410.167.205.234/3110.167.205.234 – 10.167.205.23510.167.205.235
5510.167.205.236/3110.167.205.236 – 10.167.205.23710.167.205.237
5610.167.205.238/3110.167.205.238 – 10.167.205.23910.167.205.239
5710.167.205.240/3110.167.205.240 – 10.167.205.24110.167.205.241
5810.167.205.242/3110.167.205.242 – 10.167.205.24310.167.205.243
5910.167.205.244/3110.167.205.244 – 10.167.205.24510.167.205.245
6010.167.205.246/3110.167.205.246 – 10.167.205.24710.167.205.247
6110.167.205.248/3110.167.205.248 – 10.167.205.24910.167.205.249
6210.167.205.250/3110.167.205.250 – 10.167.205.25110.167.205.251
6310.167.205.252/3110.167.205.252 – 10.167.205.25310.167.205.253
6410.167.205.254/3110.167.205.254 – 10.167.205.25510.167.205.255
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 →