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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)10.18.78.0/24
network10.18.78.0/24
broadcast10.18.78.255
first host10.18.78.1
last host10.18.78.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.18.78.0/24
address00001010.00010010.01001110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00010010.01001110.00000000
broadcast00001010.00010010.01001110.11111111
green = network part, grey = host part
hex0x0a124e00
decimal168971776
reverse dns0.78.18.10.in-addr.arpa
ipv4-mapped::ffff:a12:4e00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.18.78.0/3010.18.78.1 – 10.18.78.210.18.78.3
210.18.78.4/3010.18.78.5 – 10.18.78.610.18.78.7
310.18.78.8/3010.18.78.9 – 10.18.78.1010.18.78.11
410.18.78.12/3010.18.78.13 – 10.18.78.1410.18.78.15
510.18.78.16/3010.18.78.17 – 10.18.78.1810.18.78.19
610.18.78.20/3010.18.78.21 – 10.18.78.2210.18.78.23
710.18.78.24/3010.18.78.25 – 10.18.78.2610.18.78.27
810.18.78.28/3010.18.78.29 – 10.18.78.3010.18.78.31
910.18.78.32/3010.18.78.33 – 10.18.78.3410.18.78.35
1010.18.78.36/3010.18.78.37 – 10.18.78.3810.18.78.39
1110.18.78.40/3010.18.78.41 – 10.18.78.4210.18.78.43
1210.18.78.44/3010.18.78.45 – 10.18.78.4610.18.78.47
1310.18.78.48/3010.18.78.49 – 10.18.78.5010.18.78.51
1410.18.78.52/3010.18.78.53 – 10.18.78.5410.18.78.55
1510.18.78.56/3010.18.78.57 – 10.18.78.5810.18.78.59
1610.18.78.60/3010.18.78.61 – 10.18.78.6210.18.78.63
1710.18.78.64/3010.18.78.65 – 10.18.78.6610.18.78.67
1810.18.78.68/3010.18.78.69 – 10.18.78.7010.18.78.71
1910.18.78.72/3010.18.78.73 – 10.18.78.7410.18.78.75
2010.18.78.76/3010.18.78.77 – 10.18.78.7810.18.78.79
2110.18.78.80/3010.18.78.81 – 10.18.78.8210.18.78.83
2210.18.78.84/3010.18.78.85 – 10.18.78.8610.18.78.87
2310.18.78.88/3010.18.78.89 – 10.18.78.9010.18.78.91
2410.18.78.92/3010.18.78.93 – 10.18.78.9410.18.78.95
2510.18.78.96/3010.18.78.97 – 10.18.78.9810.18.78.99
2610.18.78.100/3010.18.78.101 – 10.18.78.10210.18.78.103
2710.18.78.104/3010.18.78.105 – 10.18.78.10610.18.78.107
2810.18.78.108/3010.18.78.109 – 10.18.78.11010.18.78.111
2910.18.78.112/3010.18.78.113 – 10.18.78.11410.18.78.115
3010.18.78.116/3010.18.78.117 – 10.18.78.11810.18.78.119
3110.18.78.120/3010.18.78.121 – 10.18.78.12210.18.78.123
3210.18.78.124/3010.18.78.125 – 10.18.78.12610.18.78.127
3310.18.78.128/3010.18.78.129 – 10.18.78.13010.18.78.131
3410.18.78.132/3010.18.78.133 – 10.18.78.13410.18.78.135
3510.18.78.136/3010.18.78.137 – 10.18.78.13810.18.78.139
3610.18.78.140/3010.18.78.141 – 10.18.78.14210.18.78.143
3710.18.78.144/3010.18.78.145 – 10.18.78.14610.18.78.147
3810.18.78.148/3010.18.78.149 – 10.18.78.15010.18.78.151
3910.18.78.152/3010.18.78.153 – 10.18.78.15410.18.78.155
4010.18.78.156/3010.18.78.157 – 10.18.78.15810.18.78.159
4110.18.78.160/3010.18.78.161 – 10.18.78.16210.18.78.163
4210.18.78.164/3010.18.78.165 – 10.18.78.16610.18.78.167
4310.18.78.168/3010.18.78.169 – 10.18.78.17010.18.78.171
4410.18.78.172/3010.18.78.173 – 10.18.78.17410.18.78.175
4510.18.78.176/3010.18.78.177 – 10.18.78.17810.18.78.179
4610.18.78.180/3010.18.78.181 – 10.18.78.18210.18.78.183
4710.18.78.184/3010.18.78.185 – 10.18.78.18610.18.78.187
4810.18.78.188/3010.18.78.189 – 10.18.78.19010.18.78.191
4910.18.78.192/3010.18.78.193 – 10.18.78.19410.18.78.195
5010.18.78.196/3010.18.78.197 – 10.18.78.19810.18.78.199
5110.18.78.200/3010.18.78.201 – 10.18.78.20210.18.78.203
5210.18.78.204/3010.18.78.205 – 10.18.78.20610.18.78.207
5310.18.78.208/3010.18.78.209 – 10.18.78.21010.18.78.211
5410.18.78.212/3010.18.78.213 – 10.18.78.21410.18.78.215
5510.18.78.216/3010.18.78.217 – 10.18.78.21810.18.78.219
5610.18.78.220/3010.18.78.221 – 10.18.78.22210.18.78.223
5710.18.78.224/3010.18.78.225 – 10.18.78.22610.18.78.227
5810.18.78.228/3010.18.78.229 – 10.18.78.23010.18.78.231
5910.18.78.232/3010.18.78.233 – 10.18.78.23410.18.78.235
6010.18.78.236/3010.18.78.237 – 10.18.78.23810.18.78.239
6110.18.78.240/3010.18.78.241 – 10.18.78.24210.18.78.243
6210.18.78.244/3010.18.78.245 – 10.18.78.24610.18.78.247
6310.18.78.248/3010.18.78.249 – 10.18.78.25010.18.78.251
6410.18.78.252/3010.18.78.253 – 10.18.78.25410.18.78.255
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 →