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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)10.167.245.128/25
network10.167.245.128/25
broadcast10.167.245.255
first host10.167.245.129
last host10.167.245.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.245.128/25
address00001010.10100111.11110101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11110101.10000000
broadcast00001010.10100111.11110101.11111111
green = network part, grey = host part
hex0x0aa7f580
decimal178779520
reverse dns128.245.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:f580

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.245.128/3110.167.245.128 – 10.167.245.12910.167.245.129
210.167.245.130/3110.167.245.130 – 10.167.245.13110.167.245.131
310.167.245.132/3110.167.245.132 – 10.167.245.13310.167.245.133
410.167.245.134/3110.167.245.134 – 10.167.245.13510.167.245.135
510.167.245.136/3110.167.245.136 – 10.167.245.13710.167.245.137
610.167.245.138/3110.167.245.138 – 10.167.245.13910.167.245.139
710.167.245.140/3110.167.245.140 – 10.167.245.14110.167.245.141
810.167.245.142/3110.167.245.142 – 10.167.245.14310.167.245.143
910.167.245.144/3110.167.245.144 – 10.167.245.14510.167.245.145
1010.167.245.146/3110.167.245.146 – 10.167.245.14710.167.245.147
1110.167.245.148/3110.167.245.148 – 10.167.245.14910.167.245.149
1210.167.245.150/3110.167.245.150 – 10.167.245.15110.167.245.151
1310.167.245.152/3110.167.245.152 – 10.167.245.15310.167.245.153
1410.167.245.154/3110.167.245.154 – 10.167.245.15510.167.245.155
1510.167.245.156/3110.167.245.156 – 10.167.245.15710.167.245.157
1610.167.245.158/3110.167.245.158 – 10.167.245.15910.167.245.159
1710.167.245.160/3110.167.245.160 – 10.167.245.16110.167.245.161
1810.167.245.162/3110.167.245.162 – 10.167.245.16310.167.245.163
1910.167.245.164/3110.167.245.164 – 10.167.245.16510.167.245.165
2010.167.245.166/3110.167.245.166 – 10.167.245.16710.167.245.167
2110.167.245.168/3110.167.245.168 – 10.167.245.16910.167.245.169
2210.167.245.170/3110.167.245.170 – 10.167.245.17110.167.245.171
2310.167.245.172/3110.167.245.172 – 10.167.245.17310.167.245.173
2410.167.245.174/3110.167.245.174 – 10.167.245.17510.167.245.175
2510.167.245.176/3110.167.245.176 – 10.167.245.17710.167.245.177
2610.167.245.178/3110.167.245.178 – 10.167.245.17910.167.245.179
2710.167.245.180/3110.167.245.180 – 10.167.245.18110.167.245.181
2810.167.245.182/3110.167.245.182 – 10.167.245.18310.167.245.183
2910.167.245.184/3110.167.245.184 – 10.167.245.18510.167.245.185
3010.167.245.186/3110.167.245.186 – 10.167.245.18710.167.245.187
3110.167.245.188/3110.167.245.188 – 10.167.245.18910.167.245.189
3210.167.245.190/3110.167.245.190 – 10.167.245.19110.167.245.191
3310.167.245.192/3110.167.245.192 – 10.167.245.19310.167.245.193
3410.167.245.194/3110.167.245.194 – 10.167.245.19510.167.245.195
3510.167.245.196/3110.167.245.196 – 10.167.245.19710.167.245.197
3610.167.245.198/3110.167.245.198 – 10.167.245.19910.167.245.199
3710.167.245.200/3110.167.245.200 – 10.167.245.20110.167.245.201
3810.167.245.202/3110.167.245.202 – 10.167.245.20310.167.245.203
3910.167.245.204/3110.167.245.204 – 10.167.245.20510.167.245.205
4010.167.245.206/3110.167.245.206 – 10.167.245.20710.167.245.207
4110.167.245.208/3110.167.245.208 – 10.167.245.20910.167.245.209
4210.167.245.210/3110.167.245.210 – 10.167.245.21110.167.245.211
4310.167.245.212/3110.167.245.212 – 10.167.245.21310.167.245.213
4410.167.245.214/3110.167.245.214 – 10.167.245.21510.167.245.215
4510.167.245.216/3110.167.245.216 – 10.167.245.21710.167.245.217
4610.167.245.218/3110.167.245.218 – 10.167.245.21910.167.245.219
4710.167.245.220/3110.167.245.220 – 10.167.245.22110.167.245.221
4810.167.245.222/3110.167.245.222 – 10.167.245.22310.167.245.223
4910.167.245.224/3110.167.245.224 – 10.167.245.22510.167.245.225
5010.167.245.226/3110.167.245.226 – 10.167.245.22710.167.245.227
5110.167.245.228/3110.167.245.228 – 10.167.245.22910.167.245.229
5210.167.245.230/3110.167.245.230 – 10.167.245.23110.167.245.231
5310.167.245.232/3110.167.245.232 – 10.167.245.23310.167.245.233
5410.167.245.234/3110.167.245.234 – 10.167.245.23510.167.245.235
5510.167.245.236/3110.167.245.236 – 10.167.245.23710.167.245.237
5610.167.245.238/3110.167.245.238 – 10.167.245.23910.167.245.239
5710.167.245.240/3110.167.245.240 – 10.167.245.24110.167.245.241
5810.167.245.242/3110.167.245.242 – 10.167.245.24310.167.245.243
5910.167.245.244/3110.167.245.244 – 10.167.245.24510.167.245.245
6010.167.245.246/3110.167.245.246 – 10.167.245.24710.167.245.247
6110.167.245.248/3110.167.245.248 – 10.167.245.24910.167.245.249
6210.167.245.250/3110.167.245.250 – 10.167.245.25110.167.245.251
6310.167.245.252/3110.167.245.252 – 10.167.245.25310.167.245.253
6410.167.245.254/3110.167.245.254 – 10.167.245.25510.167.245.255
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 →