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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)10.78.15.0/24
network10.78.15.0/24
broadcast10.78.15.255
first host10.78.15.1
last host10.78.15.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.78.15.0/24
address00001010.01001110.00001111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001110.00001111.00000000
broadcast00001010.01001110.00001111.11111111
green = network part, grey = host part
hex0x0a4e0f00
decimal172887808
reverse dns0.15.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:f00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.15.0/3010.78.15.1 – 10.78.15.210.78.15.3
210.78.15.4/3010.78.15.5 – 10.78.15.610.78.15.7
310.78.15.8/3010.78.15.9 – 10.78.15.1010.78.15.11
410.78.15.12/3010.78.15.13 – 10.78.15.1410.78.15.15
510.78.15.16/3010.78.15.17 – 10.78.15.1810.78.15.19
610.78.15.20/3010.78.15.21 – 10.78.15.2210.78.15.23
710.78.15.24/3010.78.15.25 – 10.78.15.2610.78.15.27
810.78.15.28/3010.78.15.29 – 10.78.15.3010.78.15.31
910.78.15.32/3010.78.15.33 – 10.78.15.3410.78.15.35
1010.78.15.36/3010.78.15.37 – 10.78.15.3810.78.15.39
1110.78.15.40/3010.78.15.41 – 10.78.15.4210.78.15.43
1210.78.15.44/3010.78.15.45 – 10.78.15.4610.78.15.47
1310.78.15.48/3010.78.15.49 – 10.78.15.5010.78.15.51
1410.78.15.52/3010.78.15.53 – 10.78.15.5410.78.15.55
1510.78.15.56/3010.78.15.57 – 10.78.15.5810.78.15.59
1610.78.15.60/3010.78.15.61 – 10.78.15.6210.78.15.63
1710.78.15.64/3010.78.15.65 – 10.78.15.6610.78.15.67
1810.78.15.68/3010.78.15.69 – 10.78.15.7010.78.15.71
1910.78.15.72/3010.78.15.73 – 10.78.15.7410.78.15.75
2010.78.15.76/3010.78.15.77 – 10.78.15.7810.78.15.79
2110.78.15.80/3010.78.15.81 – 10.78.15.8210.78.15.83
2210.78.15.84/3010.78.15.85 – 10.78.15.8610.78.15.87
2310.78.15.88/3010.78.15.89 – 10.78.15.9010.78.15.91
2410.78.15.92/3010.78.15.93 – 10.78.15.9410.78.15.95
2510.78.15.96/3010.78.15.97 – 10.78.15.9810.78.15.99
2610.78.15.100/3010.78.15.101 – 10.78.15.10210.78.15.103
2710.78.15.104/3010.78.15.105 – 10.78.15.10610.78.15.107
2810.78.15.108/3010.78.15.109 – 10.78.15.11010.78.15.111
2910.78.15.112/3010.78.15.113 – 10.78.15.11410.78.15.115
3010.78.15.116/3010.78.15.117 – 10.78.15.11810.78.15.119
3110.78.15.120/3010.78.15.121 – 10.78.15.12210.78.15.123
3210.78.15.124/3010.78.15.125 – 10.78.15.12610.78.15.127
3310.78.15.128/3010.78.15.129 – 10.78.15.13010.78.15.131
3410.78.15.132/3010.78.15.133 – 10.78.15.13410.78.15.135
3510.78.15.136/3010.78.15.137 – 10.78.15.13810.78.15.139
3610.78.15.140/3010.78.15.141 – 10.78.15.14210.78.15.143
3710.78.15.144/3010.78.15.145 – 10.78.15.14610.78.15.147
3810.78.15.148/3010.78.15.149 – 10.78.15.15010.78.15.151
3910.78.15.152/3010.78.15.153 – 10.78.15.15410.78.15.155
4010.78.15.156/3010.78.15.157 – 10.78.15.15810.78.15.159
4110.78.15.160/3010.78.15.161 – 10.78.15.16210.78.15.163
4210.78.15.164/3010.78.15.165 – 10.78.15.16610.78.15.167
4310.78.15.168/3010.78.15.169 – 10.78.15.17010.78.15.171
4410.78.15.172/3010.78.15.173 – 10.78.15.17410.78.15.175
4510.78.15.176/3010.78.15.177 – 10.78.15.17810.78.15.179
4610.78.15.180/3010.78.15.181 – 10.78.15.18210.78.15.183
4710.78.15.184/3010.78.15.185 – 10.78.15.18610.78.15.187
4810.78.15.188/3010.78.15.189 – 10.78.15.19010.78.15.191
4910.78.15.192/3010.78.15.193 – 10.78.15.19410.78.15.195
5010.78.15.196/3010.78.15.197 – 10.78.15.19810.78.15.199
5110.78.15.200/3010.78.15.201 – 10.78.15.20210.78.15.203
5210.78.15.204/3010.78.15.205 – 10.78.15.20610.78.15.207
5310.78.15.208/3010.78.15.209 – 10.78.15.21010.78.15.211
5410.78.15.212/3010.78.15.213 – 10.78.15.21410.78.15.215
5510.78.15.216/3010.78.15.217 – 10.78.15.21810.78.15.219
5610.78.15.220/3010.78.15.221 – 10.78.15.22210.78.15.223
5710.78.15.224/3010.78.15.225 – 10.78.15.22610.78.15.227
5810.78.15.228/3010.78.15.229 – 10.78.15.23010.78.15.231
5910.78.15.232/3010.78.15.233 – 10.78.15.23410.78.15.235
6010.78.15.236/3010.78.15.237 – 10.78.15.23810.78.15.239
6110.78.15.240/3010.78.15.241 – 10.78.15.24210.78.15.243
6210.78.15.244/3010.78.15.245 – 10.78.15.24610.78.15.247
6310.78.15.248/3010.78.15.249 – 10.78.15.25010.78.15.251
6410.78.15.252/3010.78.15.253 – 10.78.15.25410.78.15.255
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 →