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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)10.72.131.0/24
network10.72.131.0/24
broadcast10.72.131.255
first host10.72.131.1
last host10.72.131.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.72.131.0/24
address00001010.01001000.10000011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001000.10000011.00000000
broadcast00001010.01001000.10000011.11111111
green = network part, grey = host part
hex0x0a488300
decimal172524288
reverse dns0.131.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:8300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.131.0/3010.72.131.1 – 10.72.131.210.72.131.3
210.72.131.4/3010.72.131.5 – 10.72.131.610.72.131.7
310.72.131.8/3010.72.131.9 – 10.72.131.1010.72.131.11
410.72.131.12/3010.72.131.13 – 10.72.131.1410.72.131.15
510.72.131.16/3010.72.131.17 – 10.72.131.1810.72.131.19
610.72.131.20/3010.72.131.21 – 10.72.131.2210.72.131.23
710.72.131.24/3010.72.131.25 – 10.72.131.2610.72.131.27
810.72.131.28/3010.72.131.29 – 10.72.131.3010.72.131.31
910.72.131.32/3010.72.131.33 – 10.72.131.3410.72.131.35
1010.72.131.36/3010.72.131.37 – 10.72.131.3810.72.131.39
1110.72.131.40/3010.72.131.41 – 10.72.131.4210.72.131.43
1210.72.131.44/3010.72.131.45 – 10.72.131.4610.72.131.47
1310.72.131.48/3010.72.131.49 – 10.72.131.5010.72.131.51
1410.72.131.52/3010.72.131.53 – 10.72.131.5410.72.131.55
1510.72.131.56/3010.72.131.57 – 10.72.131.5810.72.131.59
1610.72.131.60/3010.72.131.61 – 10.72.131.6210.72.131.63
1710.72.131.64/3010.72.131.65 – 10.72.131.6610.72.131.67
1810.72.131.68/3010.72.131.69 – 10.72.131.7010.72.131.71
1910.72.131.72/3010.72.131.73 – 10.72.131.7410.72.131.75
2010.72.131.76/3010.72.131.77 – 10.72.131.7810.72.131.79
2110.72.131.80/3010.72.131.81 – 10.72.131.8210.72.131.83
2210.72.131.84/3010.72.131.85 – 10.72.131.8610.72.131.87
2310.72.131.88/3010.72.131.89 – 10.72.131.9010.72.131.91
2410.72.131.92/3010.72.131.93 – 10.72.131.9410.72.131.95
2510.72.131.96/3010.72.131.97 – 10.72.131.9810.72.131.99
2610.72.131.100/3010.72.131.101 – 10.72.131.10210.72.131.103
2710.72.131.104/3010.72.131.105 – 10.72.131.10610.72.131.107
2810.72.131.108/3010.72.131.109 – 10.72.131.11010.72.131.111
2910.72.131.112/3010.72.131.113 – 10.72.131.11410.72.131.115
3010.72.131.116/3010.72.131.117 – 10.72.131.11810.72.131.119
3110.72.131.120/3010.72.131.121 – 10.72.131.12210.72.131.123
3210.72.131.124/3010.72.131.125 – 10.72.131.12610.72.131.127
3310.72.131.128/3010.72.131.129 – 10.72.131.13010.72.131.131
3410.72.131.132/3010.72.131.133 – 10.72.131.13410.72.131.135
3510.72.131.136/3010.72.131.137 – 10.72.131.13810.72.131.139
3610.72.131.140/3010.72.131.141 – 10.72.131.14210.72.131.143
3710.72.131.144/3010.72.131.145 – 10.72.131.14610.72.131.147
3810.72.131.148/3010.72.131.149 – 10.72.131.15010.72.131.151
3910.72.131.152/3010.72.131.153 – 10.72.131.15410.72.131.155
4010.72.131.156/3010.72.131.157 – 10.72.131.15810.72.131.159
4110.72.131.160/3010.72.131.161 – 10.72.131.16210.72.131.163
4210.72.131.164/3010.72.131.165 – 10.72.131.16610.72.131.167
4310.72.131.168/3010.72.131.169 – 10.72.131.17010.72.131.171
4410.72.131.172/3010.72.131.173 – 10.72.131.17410.72.131.175
4510.72.131.176/3010.72.131.177 – 10.72.131.17810.72.131.179
4610.72.131.180/3010.72.131.181 – 10.72.131.18210.72.131.183
4710.72.131.184/3010.72.131.185 – 10.72.131.18610.72.131.187
4810.72.131.188/3010.72.131.189 – 10.72.131.19010.72.131.191
4910.72.131.192/3010.72.131.193 – 10.72.131.19410.72.131.195
5010.72.131.196/3010.72.131.197 – 10.72.131.19810.72.131.199
5110.72.131.200/3010.72.131.201 – 10.72.131.20210.72.131.203
5210.72.131.204/3010.72.131.205 – 10.72.131.20610.72.131.207
5310.72.131.208/3010.72.131.209 – 10.72.131.21010.72.131.211
5410.72.131.212/3010.72.131.213 – 10.72.131.21410.72.131.215
5510.72.131.216/3010.72.131.217 – 10.72.131.21810.72.131.219
5610.72.131.220/3010.72.131.221 – 10.72.131.22210.72.131.223
5710.72.131.224/3010.72.131.225 – 10.72.131.22610.72.131.227
5810.72.131.228/3010.72.131.229 – 10.72.131.23010.72.131.231
5910.72.131.232/3010.72.131.233 – 10.72.131.23410.72.131.235
6010.72.131.236/3010.72.131.237 – 10.72.131.23810.72.131.239
6110.72.131.240/3010.72.131.241 – 10.72.131.24210.72.131.243
6210.72.131.244/3010.72.131.245 – 10.72.131.24610.72.131.247
6310.72.131.248/3010.72.131.249 – 10.72.131.25010.72.131.251
6410.72.131.252/3010.72.131.253 – 10.72.131.25410.72.131.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/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-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →