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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)10.3.206.0/24
network10.3.206.0/24
broadcast10.3.206.255
first host10.3.206.1
last host10.3.206.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.3.206.0/24
address00001010.00000011.11001110.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000011.11001110.00000000
broadcast00001010.00000011.11001110.11111111
green = network part, grey = host part
hex0x0a03ce00
decimal168021504
reverse dns0.206.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:ce00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.206.0/3010.3.206.1 – 10.3.206.210.3.206.3
210.3.206.4/3010.3.206.5 – 10.3.206.610.3.206.7
310.3.206.8/3010.3.206.9 – 10.3.206.1010.3.206.11
410.3.206.12/3010.3.206.13 – 10.3.206.1410.3.206.15
510.3.206.16/3010.3.206.17 – 10.3.206.1810.3.206.19
610.3.206.20/3010.3.206.21 – 10.3.206.2210.3.206.23
710.3.206.24/3010.3.206.25 – 10.3.206.2610.3.206.27
810.3.206.28/3010.3.206.29 – 10.3.206.3010.3.206.31
910.3.206.32/3010.3.206.33 – 10.3.206.3410.3.206.35
1010.3.206.36/3010.3.206.37 – 10.3.206.3810.3.206.39
1110.3.206.40/3010.3.206.41 – 10.3.206.4210.3.206.43
1210.3.206.44/3010.3.206.45 – 10.3.206.4610.3.206.47
1310.3.206.48/3010.3.206.49 – 10.3.206.5010.3.206.51
1410.3.206.52/3010.3.206.53 – 10.3.206.5410.3.206.55
1510.3.206.56/3010.3.206.57 – 10.3.206.5810.3.206.59
1610.3.206.60/3010.3.206.61 – 10.3.206.6210.3.206.63
1710.3.206.64/3010.3.206.65 – 10.3.206.6610.3.206.67
1810.3.206.68/3010.3.206.69 – 10.3.206.7010.3.206.71
1910.3.206.72/3010.3.206.73 – 10.3.206.7410.3.206.75
2010.3.206.76/3010.3.206.77 – 10.3.206.7810.3.206.79
2110.3.206.80/3010.3.206.81 – 10.3.206.8210.3.206.83
2210.3.206.84/3010.3.206.85 – 10.3.206.8610.3.206.87
2310.3.206.88/3010.3.206.89 – 10.3.206.9010.3.206.91
2410.3.206.92/3010.3.206.93 – 10.3.206.9410.3.206.95
2510.3.206.96/3010.3.206.97 – 10.3.206.9810.3.206.99
2610.3.206.100/3010.3.206.101 – 10.3.206.10210.3.206.103
2710.3.206.104/3010.3.206.105 – 10.3.206.10610.3.206.107
2810.3.206.108/3010.3.206.109 – 10.3.206.11010.3.206.111
2910.3.206.112/3010.3.206.113 – 10.3.206.11410.3.206.115
3010.3.206.116/3010.3.206.117 – 10.3.206.11810.3.206.119
3110.3.206.120/3010.3.206.121 – 10.3.206.12210.3.206.123
3210.3.206.124/3010.3.206.125 – 10.3.206.12610.3.206.127
3310.3.206.128/3010.3.206.129 – 10.3.206.13010.3.206.131
3410.3.206.132/3010.3.206.133 – 10.3.206.13410.3.206.135
3510.3.206.136/3010.3.206.137 – 10.3.206.13810.3.206.139
3610.3.206.140/3010.3.206.141 – 10.3.206.14210.3.206.143
3710.3.206.144/3010.3.206.145 – 10.3.206.14610.3.206.147
3810.3.206.148/3010.3.206.149 – 10.3.206.15010.3.206.151
3910.3.206.152/3010.3.206.153 – 10.3.206.15410.3.206.155
4010.3.206.156/3010.3.206.157 – 10.3.206.15810.3.206.159
4110.3.206.160/3010.3.206.161 – 10.3.206.16210.3.206.163
4210.3.206.164/3010.3.206.165 – 10.3.206.16610.3.206.167
4310.3.206.168/3010.3.206.169 – 10.3.206.17010.3.206.171
4410.3.206.172/3010.3.206.173 – 10.3.206.17410.3.206.175
4510.3.206.176/3010.3.206.177 – 10.3.206.17810.3.206.179
4610.3.206.180/3010.3.206.181 – 10.3.206.18210.3.206.183
4710.3.206.184/3010.3.206.185 – 10.3.206.18610.3.206.187
4810.3.206.188/3010.3.206.189 – 10.3.206.19010.3.206.191
4910.3.206.192/3010.3.206.193 – 10.3.206.19410.3.206.195
5010.3.206.196/3010.3.206.197 – 10.3.206.19810.3.206.199
5110.3.206.200/3010.3.206.201 – 10.3.206.20210.3.206.203
5210.3.206.204/3010.3.206.205 – 10.3.206.20610.3.206.207
5310.3.206.208/3010.3.206.209 – 10.3.206.21010.3.206.211
5410.3.206.212/3010.3.206.213 – 10.3.206.21410.3.206.215
5510.3.206.216/3010.3.206.217 – 10.3.206.21810.3.206.219
5610.3.206.220/3010.3.206.221 – 10.3.206.22210.3.206.223
5710.3.206.224/3010.3.206.225 – 10.3.206.22610.3.206.227
5810.3.206.228/3010.3.206.229 – 10.3.206.23010.3.206.231
5910.3.206.232/3010.3.206.233 – 10.3.206.23410.3.206.235
6010.3.206.236/3010.3.206.237 – 10.3.206.23810.3.206.239
6110.3.206.240/3010.3.206.241 – 10.3.206.24210.3.206.243
6210.3.206.244/3010.3.206.245 – 10.3.206.24610.3.206.247
6310.3.206.248/3010.3.206.249 – 10.3.206.25010.3.206.251
6410.3.206.252/3010.3.206.253 – 10.3.206.25410.3.206.255
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 →