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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)10.72.35.0/24
network10.72.35.0/24
broadcast10.72.35.255
first host10.72.35.1
last host10.72.35.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.72.35.0/24
address00001010.01001000.00100011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001000.00100011.00000000
broadcast00001010.01001000.00100011.11111111
green = network part, grey = host part
hex0x0a482300
decimal172499712
reverse dns0.35.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:2300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.35.0/3010.72.35.1 – 10.72.35.210.72.35.3
210.72.35.4/3010.72.35.5 – 10.72.35.610.72.35.7
310.72.35.8/3010.72.35.9 – 10.72.35.1010.72.35.11
410.72.35.12/3010.72.35.13 – 10.72.35.1410.72.35.15
510.72.35.16/3010.72.35.17 – 10.72.35.1810.72.35.19
610.72.35.20/3010.72.35.21 – 10.72.35.2210.72.35.23
710.72.35.24/3010.72.35.25 – 10.72.35.2610.72.35.27
810.72.35.28/3010.72.35.29 – 10.72.35.3010.72.35.31
910.72.35.32/3010.72.35.33 – 10.72.35.3410.72.35.35
1010.72.35.36/3010.72.35.37 – 10.72.35.3810.72.35.39
1110.72.35.40/3010.72.35.41 – 10.72.35.4210.72.35.43
1210.72.35.44/3010.72.35.45 – 10.72.35.4610.72.35.47
1310.72.35.48/3010.72.35.49 – 10.72.35.5010.72.35.51
1410.72.35.52/3010.72.35.53 – 10.72.35.5410.72.35.55
1510.72.35.56/3010.72.35.57 – 10.72.35.5810.72.35.59
1610.72.35.60/3010.72.35.61 – 10.72.35.6210.72.35.63
1710.72.35.64/3010.72.35.65 – 10.72.35.6610.72.35.67
1810.72.35.68/3010.72.35.69 – 10.72.35.7010.72.35.71
1910.72.35.72/3010.72.35.73 – 10.72.35.7410.72.35.75
2010.72.35.76/3010.72.35.77 – 10.72.35.7810.72.35.79
2110.72.35.80/3010.72.35.81 – 10.72.35.8210.72.35.83
2210.72.35.84/3010.72.35.85 – 10.72.35.8610.72.35.87
2310.72.35.88/3010.72.35.89 – 10.72.35.9010.72.35.91
2410.72.35.92/3010.72.35.93 – 10.72.35.9410.72.35.95
2510.72.35.96/3010.72.35.97 – 10.72.35.9810.72.35.99
2610.72.35.100/3010.72.35.101 – 10.72.35.10210.72.35.103
2710.72.35.104/3010.72.35.105 – 10.72.35.10610.72.35.107
2810.72.35.108/3010.72.35.109 – 10.72.35.11010.72.35.111
2910.72.35.112/3010.72.35.113 – 10.72.35.11410.72.35.115
3010.72.35.116/3010.72.35.117 – 10.72.35.11810.72.35.119
3110.72.35.120/3010.72.35.121 – 10.72.35.12210.72.35.123
3210.72.35.124/3010.72.35.125 – 10.72.35.12610.72.35.127
3310.72.35.128/3010.72.35.129 – 10.72.35.13010.72.35.131
3410.72.35.132/3010.72.35.133 – 10.72.35.13410.72.35.135
3510.72.35.136/3010.72.35.137 – 10.72.35.13810.72.35.139
3610.72.35.140/3010.72.35.141 – 10.72.35.14210.72.35.143
3710.72.35.144/3010.72.35.145 – 10.72.35.14610.72.35.147
3810.72.35.148/3010.72.35.149 – 10.72.35.15010.72.35.151
3910.72.35.152/3010.72.35.153 – 10.72.35.15410.72.35.155
4010.72.35.156/3010.72.35.157 – 10.72.35.15810.72.35.159
4110.72.35.160/3010.72.35.161 – 10.72.35.16210.72.35.163
4210.72.35.164/3010.72.35.165 – 10.72.35.16610.72.35.167
4310.72.35.168/3010.72.35.169 – 10.72.35.17010.72.35.171
4410.72.35.172/3010.72.35.173 – 10.72.35.17410.72.35.175
4510.72.35.176/3010.72.35.177 – 10.72.35.17810.72.35.179
4610.72.35.180/3010.72.35.181 – 10.72.35.18210.72.35.183
4710.72.35.184/3010.72.35.185 – 10.72.35.18610.72.35.187
4810.72.35.188/3010.72.35.189 – 10.72.35.19010.72.35.191
4910.72.35.192/3010.72.35.193 – 10.72.35.19410.72.35.195
5010.72.35.196/3010.72.35.197 – 10.72.35.19810.72.35.199
5110.72.35.200/3010.72.35.201 – 10.72.35.20210.72.35.203
5210.72.35.204/3010.72.35.205 – 10.72.35.20610.72.35.207
5310.72.35.208/3010.72.35.209 – 10.72.35.21010.72.35.211
5410.72.35.212/3010.72.35.213 – 10.72.35.21410.72.35.215
5510.72.35.216/3010.72.35.217 – 10.72.35.21810.72.35.219
5610.72.35.220/3010.72.35.221 – 10.72.35.22210.72.35.223
5710.72.35.224/3010.72.35.225 – 10.72.35.22610.72.35.227
5810.72.35.228/3010.72.35.229 – 10.72.35.23010.72.35.231
5910.72.35.232/3010.72.35.233 – 10.72.35.23410.72.35.235
6010.72.35.236/3010.72.35.237 – 10.72.35.23810.72.35.239
6110.72.35.240/3010.72.35.241 – 10.72.35.24210.72.35.243
6210.72.35.244/3010.72.35.245 – 10.72.35.24610.72.35.247
6310.72.35.248/3010.72.35.249 – 10.72.35.25010.72.35.251
6410.72.35.252/3010.72.35.253 – 10.72.35.25410.72.35.255
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 →