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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)10.76.232.128/25
network10.76.232.128/25
broadcast10.76.232.255
first host10.76.232.129
last host10.76.232.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.76.232.128/25
address00001010.01001100.11101000.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001100.11101000.10000000
broadcast00001010.01001100.11101000.11111111
green = network part, grey = host part
hex0x0a4ce880
decimal172812416
reverse dns128.232.76.10.in-addr.arpa
ipv4-mapped::ffff:a4c:e880

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.76.232.128/3110.76.232.128 – 10.76.232.12910.76.232.129
210.76.232.130/3110.76.232.130 – 10.76.232.13110.76.232.131
310.76.232.132/3110.76.232.132 – 10.76.232.13310.76.232.133
410.76.232.134/3110.76.232.134 – 10.76.232.13510.76.232.135
510.76.232.136/3110.76.232.136 – 10.76.232.13710.76.232.137
610.76.232.138/3110.76.232.138 – 10.76.232.13910.76.232.139
710.76.232.140/3110.76.232.140 – 10.76.232.14110.76.232.141
810.76.232.142/3110.76.232.142 – 10.76.232.14310.76.232.143
910.76.232.144/3110.76.232.144 – 10.76.232.14510.76.232.145
1010.76.232.146/3110.76.232.146 – 10.76.232.14710.76.232.147
1110.76.232.148/3110.76.232.148 – 10.76.232.14910.76.232.149
1210.76.232.150/3110.76.232.150 – 10.76.232.15110.76.232.151
1310.76.232.152/3110.76.232.152 – 10.76.232.15310.76.232.153
1410.76.232.154/3110.76.232.154 – 10.76.232.15510.76.232.155
1510.76.232.156/3110.76.232.156 – 10.76.232.15710.76.232.157
1610.76.232.158/3110.76.232.158 – 10.76.232.15910.76.232.159
1710.76.232.160/3110.76.232.160 – 10.76.232.16110.76.232.161
1810.76.232.162/3110.76.232.162 – 10.76.232.16310.76.232.163
1910.76.232.164/3110.76.232.164 – 10.76.232.16510.76.232.165
2010.76.232.166/3110.76.232.166 – 10.76.232.16710.76.232.167
2110.76.232.168/3110.76.232.168 – 10.76.232.16910.76.232.169
2210.76.232.170/3110.76.232.170 – 10.76.232.17110.76.232.171
2310.76.232.172/3110.76.232.172 – 10.76.232.17310.76.232.173
2410.76.232.174/3110.76.232.174 – 10.76.232.17510.76.232.175
2510.76.232.176/3110.76.232.176 – 10.76.232.17710.76.232.177
2610.76.232.178/3110.76.232.178 – 10.76.232.17910.76.232.179
2710.76.232.180/3110.76.232.180 – 10.76.232.18110.76.232.181
2810.76.232.182/3110.76.232.182 – 10.76.232.18310.76.232.183
2910.76.232.184/3110.76.232.184 – 10.76.232.18510.76.232.185
3010.76.232.186/3110.76.232.186 – 10.76.232.18710.76.232.187
3110.76.232.188/3110.76.232.188 – 10.76.232.18910.76.232.189
3210.76.232.190/3110.76.232.190 – 10.76.232.19110.76.232.191
3310.76.232.192/3110.76.232.192 – 10.76.232.19310.76.232.193
3410.76.232.194/3110.76.232.194 – 10.76.232.19510.76.232.195
3510.76.232.196/3110.76.232.196 – 10.76.232.19710.76.232.197
3610.76.232.198/3110.76.232.198 – 10.76.232.19910.76.232.199
3710.76.232.200/3110.76.232.200 – 10.76.232.20110.76.232.201
3810.76.232.202/3110.76.232.202 – 10.76.232.20310.76.232.203
3910.76.232.204/3110.76.232.204 – 10.76.232.20510.76.232.205
4010.76.232.206/3110.76.232.206 – 10.76.232.20710.76.232.207
4110.76.232.208/3110.76.232.208 – 10.76.232.20910.76.232.209
4210.76.232.210/3110.76.232.210 – 10.76.232.21110.76.232.211
4310.76.232.212/3110.76.232.212 – 10.76.232.21310.76.232.213
4410.76.232.214/3110.76.232.214 – 10.76.232.21510.76.232.215
4510.76.232.216/3110.76.232.216 – 10.76.232.21710.76.232.217
4610.76.232.218/3110.76.232.218 – 10.76.232.21910.76.232.219
4710.76.232.220/3110.76.232.220 – 10.76.232.22110.76.232.221
4810.76.232.222/3110.76.232.222 – 10.76.232.22310.76.232.223
4910.76.232.224/3110.76.232.224 – 10.76.232.22510.76.232.225
5010.76.232.226/3110.76.232.226 – 10.76.232.22710.76.232.227
5110.76.232.228/3110.76.232.228 – 10.76.232.22910.76.232.229
5210.76.232.230/3110.76.232.230 – 10.76.232.23110.76.232.231
5310.76.232.232/3110.76.232.232 – 10.76.232.23310.76.232.233
5410.76.232.234/3110.76.232.234 – 10.76.232.23510.76.232.235
5510.76.232.236/3110.76.232.236 – 10.76.232.23710.76.232.237
5610.76.232.238/3110.76.232.238 – 10.76.232.23910.76.232.239
5710.76.232.240/3110.76.232.240 – 10.76.232.24110.76.232.241
5810.76.232.242/3110.76.232.242 – 10.76.232.24310.76.232.243
5910.76.232.244/3110.76.232.244 – 10.76.232.24510.76.232.245
6010.76.232.246/3110.76.232.246 – 10.76.232.24710.76.232.247
6110.76.232.248/3110.76.232.248 – 10.76.232.24910.76.232.249
6210.76.232.250/3110.76.232.250 – 10.76.232.25110.76.232.251
6310.76.232.252/3110.76.232.252 – 10.76.232.25310.76.232.253
6410.76.232.254/3110.76.232.254 – 10.76.232.25510.76.232.255
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 →