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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)10.78.1.0/24
network10.78.1.0/24
broadcast10.78.1.255
first host10.78.1.1
last host10.78.1.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.78.1.0/24
address00001010.01001110.00000001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001110.00000001.00000000
broadcast00001010.01001110.00000001.11111111
green = network part, grey = host part
hex0x0a4e0100
decimal172884224
reverse dns0.1.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:100

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.1.0/3010.78.1.1 – 10.78.1.210.78.1.3
210.78.1.4/3010.78.1.5 – 10.78.1.610.78.1.7
310.78.1.8/3010.78.1.9 – 10.78.1.1010.78.1.11
410.78.1.12/3010.78.1.13 – 10.78.1.1410.78.1.15
510.78.1.16/3010.78.1.17 – 10.78.1.1810.78.1.19
610.78.1.20/3010.78.1.21 – 10.78.1.2210.78.1.23
710.78.1.24/3010.78.1.25 – 10.78.1.2610.78.1.27
810.78.1.28/3010.78.1.29 – 10.78.1.3010.78.1.31
910.78.1.32/3010.78.1.33 – 10.78.1.3410.78.1.35
1010.78.1.36/3010.78.1.37 – 10.78.1.3810.78.1.39
1110.78.1.40/3010.78.1.41 – 10.78.1.4210.78.1.43
1210.78.1.44/3010.78.1.45 – 10.78.1.4610.78.1.47
1310.78.1.48/3010.78.1.49 – 10.78.1.5010.78.1.51
1410.78.1.52/3010.78.1.53 – 10.78.1.5410.78.1.55
1510.78.1.56/3010.78.1.57 – 10.78.1.5810.78.1.59
1610.78.1.60/3010.78.1.61 – 10.78.1.6210.78.1.63
1710.78.1.64/3010.78.1.65 – 10.78.1.6610.78.1.67
1810.78.1.68/3010.78.1.69 – 10.78.1.7010.78.1.71
1910.78.1.72/3010.78.1.73 – 10.78.1.7410.78.1.75
2010.78.1.76/3010.78.1.77 – 10.78.1.7810.78.1.79
2110.78.1.80/3010.78.1.81 – 10.78.1.8210.78.1.83
2210.78.1.84/3010.78.1.85 – 10.78.1.8610.78.1.87
2310.78.1.88/3010.78.1.89 – 10.78.1.9010.78.1.91
2410.78.1.92/3010.78.1.93 – 10.78.1.9410.78.1.95
2510.78.1.96/3010.78.1.97 – 10.78.1.9810.78.1.99
2610.78.1.100/3010.78.1.101 – 10.78.1.10210.78.1.103
2710.78.1.104/3010.78.1.105 – 10.78.1.10610.78.1.107
2810.78.1.108/3010.78.1.109 – 10.78.1.11010.78.1.111
2910.78.1.112/3010.78.1.113 – 10.78.1.11410.78.1.115
3010.78.1.116/3010.78.1.117 – 10.78.1.11810.78.1.119
3110.78.1.120/3010.78.1.121 – 10.78.1.12210.78.1.123
3210.78.1.124/3010.78.1.125 – 10.78.1.12610.78.1.127
3310.78.1.128/3010.78.1.129 – 10.78.1.13010.78.1.131
3410.78.1.132/3010.78.1.133 – 10.78.1.13410.78.1.135
3510.78.1.136/3010.78.1.137 – 10.78.1.13810.78.1.139
3610.78.1.140/3010.78.1.141 – 10.78.1.14210.78.1.143
3710.78.1.144/3010.78.1.145 – 10.78.1.14610.78.1.147
3810.78.1.148/3010.78.1.149 – 10.78.1.15010.78.1.151
3910.78.1.152/3010.78.1.153 – 10.78.1.15410.78.1.155
4010.78.1.156/3010.78.1.157 – 10.78.1.15810.78.1.159
4110.78.1.160/3010.78.1.161 – 10.78.1.16210.78.1.163
4210.78.1.164/3010.78.1.165 – 10.78.1.16610.78.1.167
4310.78.1.168/3010.78.1.169 – 10.78.1.17010.78.1.171
4410.78.1.172/3010.78.1.173 – 10.78.1.17410.78.1.175
4510.78.1.176/3010.78.1.177 – 10.78.1.17810.78.1.179
4610.78.1.180/3010.78.1.181 – 10.78.1.18210.78.1.183
4710.78.1.184/3010.78.1.185 – 10.78.1.18610.78.1.187
4810.78.1.188/3010.78.1.189 – 10.78.1.19010.78.1.191
4910.78.1.192/3010.78.1.193 – 10.78.1.19410.78.1.195
5010.78.1.196/3010.78.1.197 – 10.78.1.19810.78.1.199
5110.78.1.200/3010.78.1.201 – 10.78.1.20210.78.1.203
5210.78.1.204/3010.78.1.205 – 10.78.1.20610.78.1.207
5310.78.1.208/3010.78.1.209 – 10.78.1.21010.78.1.211
5410.78.1.212/3010.78.1.213 – 10.78.1.21410.78.1.215
5510.78.1.216/3010.78.1.217 – 10.78.1.21810.78.1.219
5610.78.1.220/3010.78.1.221 – 10.78.1.22210.78.1.223
5710.78.1.224/3010.78.1.225 – 10.78.1.22610.78.1.227
5810.78.1.228/3010.78.1.229 – 10.78.1.23010.78.1.231
5910.78.1.232/3010.78.1.233 – 10.78.1.23410.78.1.235
6010.78.1.236/3010.78.1.237 – 10.78.1.23810.78.1.239
6110.78.1.240/3010.78.1.241 – 10.78.1.24210.78.1.243
6210.78.1.244/3010.78.1.245 – 10.78.1.24610.78.1.247
6310.78.1.248/3010.78.1.249 – 10.78.1.25010.78.1.251
6410.78.1.252/3010.78.1.253 – 10.78.1.25410.78.1.255
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 →