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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)10.72.166.0/24
network10.72.166.0/24
broadcast10.72.166.255
first host10.72.166.1
last host10.72.166.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.72.166.0/24
address00001010.01001000.10100110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001000.10100110.00000000
broadcast00001010.01001000.10100110.11111111
green = network part, grey = host part
hex0x0a48a600
decimal172533248
reverse dns0.166.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:a600

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.166.0/3010.72.166.1 – 10.72.166.210.72.166.3
210.72.166.4/3010.72.166.5 – 10.72.166.610.72.166.7
310.72.166.8/3010.72.166.9 – 10.72.166.1010.72.166.11
410.72.166.12/3010.72.166.13 – 10.72.166.1410.72.166.15
510.72.166.16/3010.72.166.17 – 10.72.166.1810.72.166.19
610.72.166.20/3010.72.166.21 – 10.72.166.2210.72.166.23
710.72.166.24/3010.72.166.25 – 10.72.166.2610.72.166.27
810.72.166.28/3010.72.166.29 – 10.72.166.3010.72.166.31
910.72.166.32/3010.72.166.33 – 10.72.166.3410.72.166.35
1010.72.166.36/3010.72.166.37 – 10.72.166.3810.72.166.39
1110.72.166.40/3010.72.166.41 – 10.72.166.4210.72.166.43
1210.72.166.44/3010.72.166.45 – 10.72.166.4610.72.166.47
1310.72.166.48/3010.72.166.49 – 10.72.166.5010.72.166.51
1410.72.166.52/3010.72.166.53 – 10.72.166.5410.72.166.55
1510.72.166.56/3010.72.166.57 – 10.72.166.5810.72.166.59
1610.72.166.60/3010.72.166.61 – 10.72.166.6210.72.166.63
1710.72.166.64/3010.72.166.65 – 10.72.166.6610.72.166.67
1810.72.166.68/3010.72.166.69 – 10.72.166.7010.72.166.71
1910.72.166.72/3010.72.166.73 – 10.72.166.7410.72.166.75
2010.72.166.76/3010.72.166.77 – 10.72.166.7810.72.166.79
2110.72.166.80/3010.72.166.81 – 10.72.166.8210.72.166.83
2210.72.166.84/3010.72.166.85 – 10.72.166.8610.72.166.87
2310.72.166.88/3010.72.166.89 – 10.72.166.9010.72.166.91
2410.72.166.92/3010.72.166.93 – 10.72.166.9410.72.166.95
2510.72.166.96/3010.72.166.97 – 10.72.166.9810.72.166.99
2610.72.166.100/3010.72.166.101 – 10.72.166.10210.72.166.103
2710.72.166.104/3010.72.166.105 – 10.72.166.10610.72.166.107
2810.72.166.108/3010.72.166.109 – 10.72.166.11010.72.166.111
2910.72.166.112/3010.72.166.113 – 10.72.166.11410.72.166.115
3010.72.166.116/3010.72.166.117 – 10.72.166.11810.72.166.119
3110.72.166.120/3010.72.166.121 – 10.72.166.12210.72.166.123
3210.72.166.124/3010.72.166.125 – 10.72.166.12610.72.166.127
3310.72.166.128/3010.72.166.129 – 10.72.166.13010.72.166.131
3410.72.166.132/3010.72.166.133 – 10.72.166.13410.72.166.135
3510.72.166.136/3010.72.166.137 – 10.72.166.13810.72.166.139
3610.72.166.140/3010.72.166.141 – 10.72.166.14210.72.166.143
3710.72.166.144/3010.72.166.145 – 10.72.166.14610.72.166.147
3810.72.166.148/3010.72.166.149 – 10.72.166.15010.72.166.151
3910.72.166.152/3010.72.166.153 – 10.72.166.15410.72.166.155
4010.72.166.156/3010.72.166.157 – 10.72.166.15810.72.166.159
4110.72.166.160/3010.72.166.161 – 10.72.166.16210.72.166.163
4210.72.166.164/3010.72.166.165 – 10.72.166.16610.72.166.167
4310.72.166.168/3010.72.166.169 – 10.72.166.17010.72.166.171
4410.72.166.172/3010.72.166.173 – 10.72.166.17410.72.166.175
4510.72.166.176/3010.72.166.177 – 10.72.166.17810.72.166.179
4610.72.166.180/3010.72.166.181 – 10.72.166.18210.72.166.183
4710.72.166.184/3010.72.166.185 – 10.72.166.18610.72.166.187
4810.72.166.188/3010.72.166.189 – 10.72.166.19010.72.166.191
4910.72.166.192/3010.72.166.193 – 10.72.166.19410.72.166.195
5010.72.166.196/3010.72.166.197 – 10.72.166.19810.72.166.199
5110.72.166.200/3010.72.166.201 – 10.72.166.20210.72.166.203
5210.72.166.204/3010.72.166.205 – 10.72.166.20610.72.166.207
5310.72.166.208/3010.72.166.209 – 10.72.166.21010.72.166.211
5410.72.166.212/3010.72.166.213 – 10.72.166.21410.72.166.215
5510.72.166.216/3010.72.166.217 – 10.72.166.21810.72.166.219
5610.72.166.220/3010.72.166.221 – 10.72.166.22210.72.166.223
5710.72.166.224/3010.72.166.225 – 10.72.166.22610.72.166.227
5810.72.166.228/3010.72.166.229 – 10.72.166.23010.72.166.231
5910.72.166.232/3010.72.166.233 – 10.72.166.23410.72.166.235
6010.72.166.236/3010.72.166.237 – 10.72.166.23810.72.166.239
6110.72.166.240/3010.72.166.241 – 10.72.166.24210.72.166.243
6210.72.166.244/3010.72.166.245 – 10.72.166.24610.72.166.247
6310.72.166.248/3010.72.166.249 – 10.72.166.25010.72.166.251
6410.72.166.252/3010.72.166.253 – 10.72.166.25410.72.166.255
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 →