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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)10.2.40.0/24
network10.2.40.0/24
broadcast10.2.40.255
first host10.2.40.1
last host10.2.40.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.40.0/24
address00001010.00000010.00101000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00101000.00000000
broadcast00001010.00000010.00101000.11111111
green = network part, grey = host part
hex0x0a022800
decimal167913472
reverse dns0.40.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2800

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.40.0/3010.2.40.1 – 10.2.40.210.2.40.3
210.2.40.4/3010.2.40.5 – 10.2.40.610.2.40.7
310.2.40.8/3010.2.40.9 – 10.2.40.1010.2.40.11
410.2.40.12/3010.2.40.13 – 10.2.40.1410.2.40.15
510.2.40.16/3010.2.40.17 – 10.2.40.1810.2.40.19
610.2.40.20/3010.2.40.21 – 10.2.40.2210.2.40.23
710.2.40.24/3010.2.40.25 – 10.2.40.2610.2.40.27
810.2.40.28/3010.2.40.29 – 10.2.40.3010.2.40.31
910.2.40.32/3010.2.40.33 – 10.2.40.3410.2.40.35
1010.2.40.36/3010.2.40.37 – 10.2.40.3810.2.40.39
1110.2.40.40/3010.2.40.41 – 10.2.40.4210.2.40.43
1210.2.40.44/3010.2.40.45 – 10.2.40.4610.2.40.47
1310.2.40.48/3010.2.40.49 – 10.2.40.5010.2.40.51
1410.2.40.52/3010.2.40.53 – 10.2.40.5410.2.40.55
1510.2.40.56/3010.2.40.57 – 10.2.40.5810.2.40.59
1610.2.40.60/3010.2.40.61 – 10.2.40.6210.2.40.63
1710.2.40.64/3010.2.40.65 – 10.2.40.6610.2.40.67
1810.2.40.68/3010.2.40.69 – 10.2.40.7010.2.40.71
1910.2.40.72/3010.2.40.73 – 10.2.40.7410.2.40.75
2010.2.40.76/3010.2.40.77 – 10.2.40.7810.2.40.79
2110.2.40.80/3010.2.40.81 – 10.2.40.8210.2.40.83
2210.2.40.84/3010.2.40.85 – 10.2.40.8610.2.40.87
2310.2.40.88/3010.2.40.89 – 10.2.40.9010.2.40.91
2410.2.40.92/3010.2.40.93 – 10.2.40.9410.2.40.95
2510.2.40.96/3010.2.40.97 – 10.2.40.9810.2.40.99
2610.2.40.100/3010.2.40.101 – 10.2.40.10210.2.40.103
2710.2.40.104/3010.2.40.105 – 10.2.40.10610.2.40.107
2810.2.40.108/3010.2.40.109 – 10.2.40.11010.2.40.111
2910.2.40.112/3010.2.40.113 – 10.2.40.11410.2.40.115
3010.2.40.116/3010.2.40.117 – 10.2.40.11810.2.40.119
3110.2.40.120/3010.2.40.121 – 10.2.40.12210.2.40.123
3210.2.40.124/3010.2.40.125 – 10.2.40.12610.2.40.127
3310.2.40.128/3010.2.40.129 – 10.2.40.13010.2.40.131
3410.2.40.132/3010.2.40.133 – 10.2.40.13410.2.40.135
3510.2.40.136/3010.2.40.137 – 10.2.40.13810.2.40.139
3610.2.40.140/3010.2.40.141 – 10.2.40.14210.2.40.143
3710.2.40.144/3010.2.40.145 – 10.2.40.14610.2.40.147
3810.2.40.148/3010.2.40.149 – 10.2.40.15010.2.40.151
3910.2.40.152/3010.2.40.153 – 10.2.40.15410.2.40.155
4010.2.40.156/3010.2.40.157 – 10.2.40.15810.2.40.159
4110.2.40.160/3010.2.40.161 – 10.2.40.16210.2.40.163
4210.2.40.164/3010.2.40.165 – 10.2.40.16610.2.40.167
4310.2.40.168/3010.2.40.169 – 10.2.40.17010.2.40.171
4410.2.40.172/3010.2.40.173 – 10.2.40.17410.2.40.175
4510.2.40.176/3010.2.40.177 – 10.2.40.17810.2.40.179
4610.2.40.180/3010.2.40.181 – 10.2.40.18210.2.40.183
4710.2.40.184/3010.2.40.185 – 10.2.40.18610.2.40.187
4810.2.40.188/3010.2.40.189 – 10.2.40.19010.2.40.191
4910.2.40.192/3010.2.40.193 – 10.2.40.19410.2.40.195
5010.2.40.196/3010.2.40.197 – 10.2.40.19810.2.40.199
5110.2.40.200/3010.2.40.201 – 10.2.40.20210.2.40.203
5210.2.40.204/3010.2.40.205 – 10.2.40.20610.2.40.207
5310.2.40.208/3010.2.40.209 – 10.2.40.21010.2.40.211
5410.2.40.212/3010.2.40.213 – 10.2.40.21410.2.40.215
5510.2.40.216/3010.2.40.217 – 10.2.40.21810.2.40.219
5610.2.40.220/3010.2.40.221 – 10.2.40.22210.2.40.223
5710.2.40.224/3010.2.40.225 – 10.2.40.22610.2.40.227
5810.2.40.228/3010.2.40.229 – 10.2.40.23010.2.40.231
5910.2.40.232/3010.2.40.233 – 10.2.40.23410.2.40.235
6010.2.40.236/3010.2.40.237 – 10.2.40.23810.2.40.239
6110.2.40.240/3010.2.40.241 – 10.2.40.24210.2.40.243
6210.2.40.244/3010.2.40.245 – 10.2.40.24610.2.40.247
6310.2.40.248/3010.2.40.249 – 10.2.40.25010.2.40.251
6410.2.40.252/3010.2.40.253 – 10.2.40.25410.2.40.255
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 →