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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)10.167.216.128/25
network10.167.216.128/25
broadcast10.167.216.255
first host10.167.216.129
last host10.167.216.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.216.128/25
address00001010.10100111.11011000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11011000.10000000
broadcast00001010.10100111.11011000.11111111
green = network part, grey = host part
hex0x0aa7d880
decimal178772096
reverse dns128.216.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:d880

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.216.128/3110.167.216.128 – 10.167.216.12910.167.216.129
210.167.216.130/3110.167.216.130 – 10.167.216.13110.167.216.131
310.167.216.132/3110.167.216.132 – 10.167.216.13310.167.216.133
410.167.216.134/3110.167.216.134 – 10.167.216.13510.167.216.135
510.167.216.136/3110.167.216.136 – 10.167.216.13710.167.216.137
610.167.216.138/3110.167.216.138 – 10.167.216.13910.167.216.139
710.167.216.140/3110.167.216.140 – 10.167.216.14110.167.216.141
810.167.216.142/3110.167.216.142 – 10.167.216.14310.167.216.143
910.167.216.144/3110.167.216.144 – 10.167.216.14510.167.216.145
1010.167.216.146/3110.167.216.146 – 10.167.216.14710.167.216.147
1110.167.216.148/3110.167.216.148 – 10.167.216.14910.167.216.149
1210.167.216.150/3110.167.216.150 – 10.167.216.15110.167.216.151
1310.167.216.152/3110.167.216.152 – 10.167.216.15310.167.216.153
1410.167.216.154/3110.167.216.154 – 10.167.216.15510.167.216.155
1510.167.216.156/3110.167.216.156 – 10.167.216.15710.167.216.157
1610.167.216.158/3110.167.216.158 – 10.167.216.15910.167.216.159
1710.167.216.160/3110.167.216.160 – 10.167.216.16110.167.216.161
1810.167.216.162/3110.167.216.162 – 10.167.216.16310.167.216.163
1910.167.216.164/3110.167.216.164 – 10.167.216.16510.167.216.165
2010.167.216.166/3110.167.216.166 – 10.167.216.16710.167.216.167
2110.167.216.168/3110.167.216.168 – 10.167.216.16910.167.216.169
2210.167.216.170/3110.167.216.170 – 10.167.216.17110.167.216.171
2310.167.216.172/3110.167.216.172 – 10.167.216.17310.167.216.173
2410.167.216.174/3110.167.216.174 – 10.167.216.17510.167.216.175
2510.167.216.176/3110.167.216.176 – 10.167.216.17710.167.216.177
2610.167.216.178/3110.167.216.178 – 10.167.216.17910.167.216.179
2710.167.216.180/3110.167.216.180 – 10.167.216.18110.167.216.181
2810.167.216.182/3110.167.216.182 – 10.167.216.18310.167.216.183
2910.167.216.184/3110.167.216.184 – 10.167.216.18510.167.216.185
3010.167.216.186/3110.167.216.186 – 10.167.216.18710.167.216.187
3110.167.216.188/3110.167.216.188 – 10.167.216.18910.167.216.189
3210.167.216.190/3110.167.216.190 – 10.167.216.19110.167.216.191
3310.167.216.192/3110.167.216.192 – 10.167.216.19310.167.216.193
3410.167.216.194/3110.167.216.194 – 10.167.216.19510.167.216.195
3510.167.216.196/3110.167.216.196 – 10.167.216.19710.167.216.197
3610.167.216.198/3110.167.216.198 – 10.167.216.19910.167.216.199
3710.167.216.200/3110.167.216.200 – 10.167.216.20110.167.216.201
3810.167.216.202/3110.167.216.202 – 10.167.216.20310.167.216.203
3910.167.216.204/3110.167.216.204 – 10.167.216.20510.167.216.205
4010.167.216.206/3110.167.216.206 – 10.167.216.20710.167.216.207
4110.167.216.208/3110.167.216.208 – 10.167.216.20910.167.216.209
4210.167.216.210/3110.167.216.210 – 10.167.216.21110.167.216.211
4310.167.216.212/3110.167.216.212 – 10.167.216.21310.167.216.213
4410.167.216.214/3110.167.216.214 – 10.167.216.21510.167.216.215
4510.167.216.216/3110.167.216.216 – 10.167.216.21710.167.216.217
4610.167.216.218/3110.167.216.218 – 10.167.216.21910.167.216.219
4710.167.216.220/3110.167.216.220 – 10.167.216.22110.167.216.221
4810.167.216.222/3110.167.216.222 – 10.167.216.22310.167.216.223
4910.167.216.224/3110.167.216.224 – 10.167.216.22510.167.216.225
5010.167.216.226/3110.167.216.226 – 10.167.216.22710.167.216.227
5110.167.216.228/3110.167.216.228 – 10.167.216.22910.167.216.229
5210.167.216.230/3110.167.216.230 – 10.167.216.23110.167.216.231
5310.167.216.232/3110.167.216.232 – 10.167.216.23310.167.216.233
5410.167.216.234/3110.167.216.234 – 10.167.216.23510.167.216.235
5510.167.216.236/3110.167.216.236 – 10.167.216.23710.167.216.237
5610.167.216.238/3110.167.216.238 – 10.167.216.23910.167.216.239
5710.167.216.240/3110.167.216.240 – 10.167.216.24110.167.216.241
5810.167.216.242/3110.167.216.242 – 10.167.216.24310.167.216.243
5910.167.216.244/3110.167.216.244 – 10.167.216.24510.167.216.245
6010.167.216.246/3110.167.216.246 – 10.167.216.24710.167.216.247
6110.167.216.248/3110.167.216.248 – 10.167.216.24910.167.216.249
6210.167.216.250/3110.167.216.250 – 10.167.216.25110.167.216.251
6310.167.216.252/3110.167.216.252 – 10.167.216.25310.167.216.253
6410.167.216.254/3110.167.216.254 – 10.167.216.25510.167.216.255
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 →