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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)10.7.237.0/24
network10.7.237.0/24
broadcast10.7.237.255
first host10.7.237.1
last host10.7.237.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.7.237.0/24
address00001010.00000111.11101101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000111.11101101.00000000
broadcast00001010.00000111.11101101.11111111
green = network part, grey = host part
hex0x0a07ed00
decimal168291584
reverse dns0.237.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:ed00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.7.237.0/3010.7.237.1 – 10.7.237.210.7.237.3
210.7.237.4/3010.7.237.5 – 10.7.237.610.7.237.7
310.7.237.8/3010.7.237.9 – 10.7.237.1010.7.237.11
410.7.237.12/3010.7.237.13 – 10.7.237.1410.7.237.15
510.7.237.16/3010.7.237.17 – 10.7.237.1810.7.237.19
610.7.237.20/3010.7.237.21 – 10.7.237.2210.7.237.23
710.7.237.24/3010.7.237.25 – 10.7.237.2610.7.237.27
810.7.237.28/3010.7.237.29 – 10.7.237.3010.7.237.31
910.7.237.32/3010.7.237.33 – 10.7.237.3410.7.237.35
1010.7.237.36/3010.7.237.37 – 10.7.237.3810.7.237.39
1110.7.237.40/3010.7.237.41 – 10.7.237.4210.7.237.43
1210.7.237.44/3010.7.237.45 – 10.7.237.4610.7.237.47
1310.7.237.48/3010.7.237.49 – 10.7.237.5010.7.237.51
1410.7.237.52/3010.7.237.53 – 10.7.237.5410.7.237.55
1510.7.237.56/3010.7.237.57 – 10.7.237.5810.7.237.59
1610.7.237.60/3010.7.237.61 – 10.7.237.6210.7.237.63
1710.7.237.64/3010.7.237.65 – 10.7.237.6610.7.237.67
1810.7.237.68/3010.7.237.69 – 10.7.237.7010.7.237.71
1910.7.237.72/3010.7.237.73 – 10.7.237.7410.7.237.75
2010.7.237.76/3010.7.237.77 – 10.7.237.7810.7.237.79
2110.7.237.80/3010.7.237.81 – 10.7.237.8210.7.237.83
2210.7.237.84/3010.7.237.85 – 10.7.237.8610.7.237.87
2310.7.237.88/3010.7.237.89 – 10.7.237.9010.7.237.91
2410.7.237.92/3010.7.237.93 – 10.7.237.9410.7.237.95
2510.7.237.96/3010.7.237.97 – 10.7.237.9810.7.237.99
2610.7.237.100/3010.7.237.101 – 10.7.237.10210.7.237.103
2710.7.237.104/3010.7.237.105 – 10.7.237.10610.7.237.107
2810.7.237.108/3010.7.237.109 – 10.7.237.11010.7.237.111
2910.7.237.112/3010.7.237.113 – 10.7.237.11410.7.237.115
3010.7.237.116/3010.7.237.117 – 10.7.237.11810.7.237.119
3110.7.237.120/3010.7.237.121 – 10.7.237.12210.7.237.123
3210.7.237.124/3010.7.237.125 – 10.7.237.12610.7.237.127
3310.7.237.128/3010.7.237.129 – 10.7.237.13010.7.237.131
3410.7.237.132/3010.7.237.133 – 10.7.237.13410.7.237.135
3510.7.237.136/3010.7.237.137 – 10.7.237.13810.7.237.139
3610.7.237.140/3010.7.237.141 – 10.7.237.14210.7.237.143
3710.7.237.144/3010.7.237.145 – 10.7.237.14610.7.237.147
3810.7.237.148/3010.7.237.149 – 10.7.237.15010.7.237.151
3910.7.237.152/3010.7.237.153 – 10.7.237.15410.7.237.155
4010.7.237.156/3010.7.237.157 – 10.7.237.15810.7.237.159
4110.7.237.160/3010.7.237.161 – 10.7.237.16210.7.237.163
4210.7.237.164/3010.7.237.165 – 10.7.237.16610.7.237.167
4310.7.237.168/3010.7.237.169 – 10.7.237.17010.7.237.171
4410.7.237.172/3010.7.237.173 – 10.7.237.17410.7.237.175
4510.7.237.176/3010.7.237.177 – 10.7.237.17810.7.237.179
4610.7.237.180/3010.7.237.181 – 10.7.237.18210.7.237.183
4710.7.237.184/3010.7.237.185 – 10.7.237.18610.7.237.187
4810.7.237.188/3010.7.237.189 – 10.7.237.19010.7.237.191
4910.7.237.192/3010.7.237.193 – 10.7.237.19410.7.237.195
5010.7.237.196/3010.7.237.197 – 10.7.237.19810.7.237.199
5110.7.237.200/3010.7.237.201 – 10.7.237.20210.7.237.203
5210.7.237.204/3010.7.237.205 – 10.7.237.20610.7.237.207
5310.7.237.208/3010.7.237.209 – 10.7.237.21010.7.237.211
5410.7.237.212/3010.7.237.213 – 10.7.237.21410.7.237.215
5510.7.237.216/3010.7.237.217 – 10.7.237.21810.7.237.219
5610.7.237.220/3010.7.237.221 – 10.7.237.22210.7.237.223
5710.7.237.224/3010.7.237.225 – 10.7.237.22610.7.237.227
5810.7.237.228/3010.7.237.229 – 10.7.237.23010.7.237.231
5910.7.237.232/3010.7.237.233 – 10.7.237.23410.7.237.235
6010.7.237.236/3010.7.237.237 – 10.7.237.23810.7.237.239
6110.7.237.240/3010.7.237.241 – 10.7.237.24210.7.237.243
6210.7.237.244/3010.7.237.245 – 10.7.237.24610.7.237.247
6310.7.237.248/3010.7.237.249 – 10.7.237.25010.7.237.251
6410.7.237.252/3010.7.237.253 – 10.7.237.25410.7.237.255
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 →