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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)10.2.131.128/25
network10.2.131.128/25
broadcast10.2.131.255
first host10.2.131.129
last host10.2.131.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.131.128/25
address00001010.00000010.10000011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.10000011.10000000
broadcast00001010.00000010.10000011.11111111
green = network part, grey = host part
hex0x0a028380
decimal167936896
reverse dns128.131.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:8380

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.131.128/3110.2.131.128 – 10.2.131.12910.2.131.129
210.2.131.130/3110.2.131.130 – 10.2.131.13110.2.131.131
310.2.131.132/3110.2.131.132 – 10.2.131.13310.2.131.133
410.2.131.134/3110.2.131.134 – 10.2.131.13510.2.131.135
510.2.131.136/3110.2.131.136 – 10.2.131.13710.2.131.137
610.2.131.138/3110.2.131.138 – 10.2.131.13910.2.131.139
710.2.131.140/3110.2.131.140 – 10.2.131.14110.2.131.141
810.2.131.142/3110.2.131.142 – 10.2.131.14310.2.131.143
910.2.131.144/3110.2.131.144 – 10.2.131.14510.2.131.145
1010.2.131.146/3110.2.131.146 – 10.2.131.14710.2.131.147
1110.2.131.148/3110.2.131.148 – 10.2.131.14910.2.131.149
1210.2.131.150/3110.2.131.150 – 10.2.131.15110.2.131.151
1310.2.131.152/3110.2.131.152 – 10.2.131.15310.2.131.153
1410.2.131.154/3110.2.131.154 – 10.2.131.15510.2.131.155
1510.2.131.156/3110.2.131.156 – 10.2.131.15710.2.131.157
1610.2.131.158/3110.2.131.158 – 10.2.131.15910.2.131.159
1710.2.131.160/3110.2.131.160 – 10.2.131.16110.2.131.161
1810.2.131.162/3110.2.131.162 – 10.2.131.16310.2.131.163
1910.2.131.164/3110.2.131.164 – 10.2.131.16510.2.131.165
2010.2.131.166/3110.2.131.166 – 10.2.131.16710.2.131.167
2110.2.131.168/3110.2.131.168 – 10.2.131.16910.2.131.169
2210.2.131.170/3110.2.131.170 – 10.2.131.17110.2.131.171
2310.2.131.172/3110.2.131.172 – 10.2.131.17310.2.131.173
2410.2.131.174/3110.2.131.174 – 10.2.131.17510.2.131.175
2510.2.131.176/3110.2.131.176 – 10.2.131.17710.2.131.177
2610.2.131.178/3110.2.131.178 – 10.2.131.17910.2.131.179
2710.2.131.180/3110.2.131.180 – 10.2.131.18110.2.131.181
2810.2.131.182/3110.2.131.182 – 10.2.131.18310.2.131.183
2910.2.131.184/3110.2.131.184 – 10.2.131.18510.2.131.185
3010.2.131.186/3110.2.131.186 – 10.2.131.18710.2.131.187
3110.2.131.188/3110.2.131.188 – 10.2.131.18910.2.131.189
3210.2.131.190/3110.2.131.190 – 10.2.131.19110.2.131.191
3310.2.131.192/3110.2.131.192 – 10.2.131.19310.2.131.193
3410.2.131.194/3110.2.131.194 – 10.2.131.19510.2.131.195
3510.2.131.196/3110.2.131.196 – 10.2.131.19710.2.131.197
3610.2.131.198/3110.2.131.198 – 10.2.131.19910.2.131.199
3710.2.131.200/3110.2.131.200 – 10.2.131.20110.2.131.201
3810.2.131.202/3110.2.131.202 – 10.2.131.20310.2.131.203
3910.2.131.204/3110.2.131.204 – 10.2.131.20510.2.131.205
4010.2.131.206/3110.2.131.206 – 10.2.131.20710.2.131.207
4110.2.131.208/3110.2.131.208 – 10.2.131.20910.2.131.209
4210.2.131.210/3110.2.131.210 – 10.2.131.21110.2.131.211
4310.2.131.212/3110.2.131.212 – 10.2.131.21310.2.131.213
4410.2.131.214/3110.2.131.214 – 10.2.131.21510.2.131.215
4510.2.131.216/3110.2.131.216 – 10.2.131.21710.2.131.217
4610.2.131.218/3110.2.131.218 – 10.2.131.21910.2.131.219
4710.2.131.220/3110.2.131.220 – 10.2.131.22110.2.131.221
4810.2.131.222/3110.2.131.222 – 10.2.131.22310.2.131.223
4910.2.131.224/3110.2.131.224 – 10.2.131.22510.2.131.225
5010.2.131.226/3110.2.131.226 – 10.2.131.22710.2.131.227
5110.2.131.228/3110.2.131.228 – 10.2.131.22910.2.131.229
5210.2.131.230/3110.2.131.230 – 10.2.131.23110.2.131.231
5310.2.131.232/3110.2.131.232 – 10.2.131.23310.2.131.233
5410.2.131.234/3110.2.131.234 – 10.2.131.23510.2.131.235
5510.2.131.236/3110.2.131.236 – 10.2.131.23710.2.131.237
5610.2.131.238/3110.2.131.238 – 10.2.131.23910.2.131.239
5710.2.131.240/3110.2.131.240 – 10.2.131.24110.2.131.241
5810.2.131.242/3110.2.131.242 – 10.2.131.24310.2.131.243
5910.2.131.244/3110.2.131.244 – 10.2.131.24510.2.131.245
6010.2.131.246/3110.2.131.246 – 10.2.131.24710.2.131.247
6110.2.131.248/3110.2.131.248 – 10.2.131.24910.2.131.249
6210.2.131.250/3110.2.131.250 – 10.2.131.25110.2.131.251
6310.2.131.252/3110.2.131.252 – 10.2.131.25310.2.131.253
6410.2.131.254/3110.2.131.254 – 10.2.131.25510.2.131.255
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 →