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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)10.78.204.0/24
network10.78.204.0/24
broadcast10.78.204.255
first host10.78.204.1
last host10.78.204.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.78.204.0/24
address00001010.01001110.11001100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01001110.11001100.00000000
broadcast00001010.01001110.11001100.11111111
green = network part, grey = host part
hex0x0a4ecc00
decimal172936192
reverse dns0.204.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:cc00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.204.0/3010.78.204.1 – 10.78.204.210.78.204.3
210.78.204.4/3010.78.204.5 – 10.78.204.610.78.204.7
310.78.204.8/3010.78.204.9 – 10.78.204.1010.78.204.11
410.78.204.12/3010.78.204.13 – 10.78.204.1410.78.204.15
510.78.204.16/3010.78.204.17 – 10.78.204.1810.78.204.19
610.78.204.20/3010.78.204.21 – 10.78.204.2210.78.204.23
710.78.204.24/3010.78.204.25 – 10.78.204.2610.78.204.27
810.78.204.28/3010.78.204.29 – 10.78.204.3010.78.204.31
910.78.204.32/3010.78.204.33 – 10.78.204.3410.78.204.35
1010.78.204.36/3010.78.204.37 – 10.78.204.3810.78.204.39
1110.78.204.40/3010.78.204.41 – 10.78.204.4210.78.204.43
1210.78.204.44/3010.78.204.45 – 10.78.204.4610.78.204.47
1310.78.204.48/3010.78.204.49 – 10.78.204.5010.78.204.51
1410.78.204.52/3010.78.204.53 – 10.78.204.5410.78.204.55
1510.78.204.56/3010.78.204.57 – 10.78.204.5810.78.204.59
1610.78.204.60/3010.78.204.61 – 10.78.204.6210.78.204.63
1710.78.204.64/3010.78.204.65 – 10.78.204.6610.78.204.67
1810.78.204.68/3010.78.204.69 – 10.78.204.7010.78.204.71
1910.78.204.72/3010.78.204.73 – 10.78.204.7410.78.204.75
2010.78.204.76/3010.78.204.77 – 10.78.204.7810.78.204.79
2110.78.204.80/3010.78.204.81 – 10.78.204.8210.78.204.83
2210.78.204.84/3010.78.204.85 – 10.78.204.8610.78.204.87
2310.78.204.88/3010.78.204.89 – 10.78.204.9010.78.204.91
2410.78.204.92/3010.78.204.93 – 10.78.204.9410.78.204.95
2510.78.204.96/3010.78.204.97 – 10.78.204.9810.78.204.99
2610.78.204.100/3010.78.204.101 – 10.78.204.10210.78.204.103
2710.78.204.104/3010.78.204.105 – 10.78.204.10610.78.204.107
2810.78.204.108/3010.78.204.109 – 10.78.204.11010.78.204.111
2910.78.204.112/3010.78.204.113 – 10.78.204.11410.78.204.115
3010.78.204.116/3010.78.204.117 – 10.78.204.11810.78.204.119
3110.78.204.120/3010.78.204.121 – 10.78.204.12210.78.204.123
3210.78.204.124/3010.78.204.125 – 10.78.204.12610.78.204.127
3310.78.204.128/3010.78.204.129 – 10.78.204.13010.78.204.131
3410.78.204.132/3010.78.204.133 – 10.78.204.13410.78.204.135
3510.78.204.136/3010.78.204.137 – 10.78.204.13810.78.204.139
3610.78.204.140/3010.78.204.141 – 10.78.204.14210.78.204.143
3710.78.204.144/3010.78.204.145 – 10.78.204.14610.78.204.147
3810.78.204.148/3010.78.204.149 – 10.78.204.15010.78.204.151
3910.78.204.152/3010.78.204.153 – 10.78.204.15410.78.204.155
4010.78.204.156/3010.78.204.157 – 10.78.204.15810.78.204.159
4110.78.204.160/3010.78.204.161 – 10.78.204.16210.78.204.163
4210.78.204.164/3010.78.204.165 – 10.78.204.16610.78.204.167
4310.78.204.168/3010.78.204.169 – 10.78.204.17010.78.204.171
4410.78.204.172/3010.78.204.173 – 10.78.204.17410.78.204.175
4510.78.204.176/3010.78.204.177 – 10.78.204.17810.78.204.179
4610.78.204.180/3010.78.204.181 – 10.78.204.18210.78.204.183
4710.78.204.184/3010.78.204.185 – 10.78.204.18610.78.204.187
4810.78.204.188/3010.78.204.189 – 10.78.204.19010.78.204.191
4910.78.204.192/3010.78.204.193 – 10.78.204.19410.78.204.195
5010.78.204.196/3010.78.204.197 – 10.78.204.19810.78.204.199
5110.78.204.200/3010.78.204.201 – 10.78.204.20210.78.204.203
5210.78.204.204/3010.78.204.205 – 10.78.204.20610.78.204.207
5310.78.204.208/3010.78.204.209 – 10.78.204.21010.78.204.211
5410.78.204.212/3010.78.204.213 – 10.78.204.21410.78.204.215
5510.78.204.216/3010.78.204.217 – 10.78.204.21810.78.204.219
5610.78.204.220/3010.78.204.221 – 10.78.204.22210.78.204.223
5710.78.204.224/3010.78.204.225 – 10.78.204.22610.78.204.227
5810.78.204.228/3010.78.204.229 – 10.78.204.23010.78.204.231
5910.78.204.232/3010.78.204.233 – 10.78.204.23410.78.204.235
6010.78.204.236/3010.78.204.237 – 10.78.204.23810.78.204.239
6110.78.204.240/3010.78.204.241 – 10.78.204.24210.78.204.243
6210.78.204.244/3010.78.204.245 – 10.78.204.24610.78.204.247
6310.78.204.248/3010.78.204.249 – 10.78.204.25010.78.204.251
6410.78.204.252/3010.78.204.253 – 10.78.204.25410.78.204.255
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 →