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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)10.72.71.0/24
network10.72.71.0/24
broadcast10.72.71.255
first host10.72.71.1
last host10.72.71.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.72.71.0/24
address00001010.01001000.01000111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001000.01000111.00000000
broadcast00001010.01001000.01000111.11111111
green = network part, grey = host part
hex0x0a484700
decimal172508928
reverse dns0.71.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:4700

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.71.0/3010.72.71.1 – 10.72.71.210.72.71.3
210.72.71.4/3010.72.71.5 – 10.72.71.610.72.71.7
310.72.71.8/3010.72.71.9 – 10.72.71.1010.72.71.11
410.72.71.12/3010.72.71.13 – 10.72.71.1410.72.71.15
510.72.71.16/3010.72.71.17 – 10.72.71.1810.72.71.19
610.72.71.20/3010.72.71.21 – 10.72.71.2210.72.71.23
710.72.71.24/3010.72.71.25 – 10.72.71.2610.72.71.27
810.72.71.28/3010.72.71.29 – 10.72.71.3010.72.71.31
910.72.71.32/3010.72.71.33 – 10.72.71.3410.72.71.35
1010.72.71.36/3010.72.71.37 – 10.72.71.3810.72.71.39
1110.72.71.40/3010.72.71.41 – 10.72.71.4210.72.71.43
1210.72.71.44/3010.72.71.45 – 10.72.71.4610.72.71.47
1310.72.71.48/3010.72.71.49 – 10.72.71.5010.72.71.51
1410.72.71.52/3010.72.71.53 – 10.72.71.5410.72.71.55
1510.72.71.56/3010.72.71.57 – 10.72.71.5810.72.71.59
1610.72.71.60/3010.72.71.61 – 10.72.71.6210.72.71.63
1710.72.71.64/3010.72.71.65 – 10.72.71.6610.72.71.67
1810.72.71.68/3010.72.71.69 – 10.72.71.7010.72.71.71
1910.72.71.72/3010.72.71.73 – 10.72.71.7410.72.71.75
2010.72.71.76/3010.72.71.77 – 10.72.71.7810.72.71.79
2110.72.71.80/3010.72.71.81 – 10.72.71.8210.72.71.83
2210.72.71.84/3010.72.71.85 – 10.72.71.8610.72.71.87
2310.72.71.88/3010.72.71.89 – 10.72.71.9010.72.71.91
2410.72.71.92/3010.72.71.93 – 10.72.71.9410.72.71.95
2510.72.71.96/3010.72.71.97 – 10.72.71.9810.72.71.99
2610.72.71.100/3010.72.71.101 – 10.72.71.10210.72.71.103
2710.72.71.104/3010.72.71.105 – 10.72.71.10610.72.71.107
2810.72.71.108/3010.72.71.109 – 10.72.71.11010.72.71.111
2910.72.71.112/3010.72.71.113 – 10.72.71.11410.72.71.115
3010.72.71.116/3010.72.71.117 – 10.72.71.11810.72.71.119
3110.72.71.120/3010.72.71.121 – 10.72.71.12210.72.71.123
3210.72.71.124/3010.72.71.125 – 10.72.71.12610.72.71.127
3310.72.71.128/3010.72.71.129 – 10.72.71.13010.72.71.131
3410.72.71.132/3010.72.71.133 – 10.72.71.13410.72.71.135
3510.72.71.136/3010.72.71.137 – 10.72.71.13810.72.71.139
3610.72.71.140/3010.72.71.141 – 10.72.71.14210.72.71.143
3710.72.71.144/3010.72.71.145 – 10.72.71.14610.72.71.147
3810.72.71.148/3010.72.71.149 – 10.72.71.15010.72.71.151
3910.72.71.152/3010.72.71.153 – 10.72.71.15410.72.71.155
4010.72.71.156/3010.72.71.157 – 10.72.71.15810.72.71.159
4110.72.71.160/3010.72.71.161 – 10.72.71.16210.72.71.163
4210.72.71.164/3010.72.71.165 – 10.72.71.16610.72.71.167
4310.72.71.168/3010.72.71.169 – 10.72.71.17010.72.71.171
4410.72.71.172/3010.72.71.173 – 10.72.71.17410.72.71.175
4510.72.71.176/3010.72.71.177 – 10.72.71.17810.72.71.179
4610.72.71.180/3010.72.71.181 – 10.72.71.18210.72.71.183
4710.72.71.184/3010.72.71.185 – 10.72.71.18610.72.71.187
4810.72.71.188/3010.72.71.189 – 10.72.71.19010.72.71.191
4910.72.71.192/3010.72.71.193 – 10.72.71.19410.72.71.195
5010.72.71.196/3010.72.71.197 – 10.72.71.19810.72.71.199
5110.72.71.200/3010.72.71.201 – 10.72.71.20210.72.71.203
5210.72.71.204/3010.72.71.205 – 10.72.71.20610.72.71.207
5310.72.71.208/3010.72.71.209 – 10.72.71.21010.72.71.211
5410.72.71.212/3010.72.71.213 – 10.72.71.21410.72.71.215
5510.72.71.216/3010.72.71.217 – 10.72.71.21810.72.71.219
5610.72.71.220/3010.72.71.221 – 10.72.71.22210.72.71.223
5710.72.71.224/3010.72.71.225 – 10.72.71.22610.72.71.227
5810.72.71.228/3010.72.71.229 – 10.72.71.23010.72.71.231
5910.72.71.232/3010.72.71.233 – 10.72.71.23410.72.71.235
6010.72.71.236/3010.72.71.237 – 10.72.71.23810.72.71.239
6110.72.71.240/3010.72.71.241 – 10.72.71.24210.72.71.243
6210.72.71.244/3010.72.71.245 – 10.72.71.24610.72.71.247
6310.72.71.248/3010.72.71.249 – 10.72.71.25010.72.71.251
6410.72.71.252/3010.72.71.253 – 10.72.71.25410.72.71.255
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 →