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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)10.0.67.0/24
network10.0.67.0/24
broadcast10.0.67.255
first host10.0.67.1
last host10.0.67.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.67.0/24
address00001010.00000000.01000011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.01000011.00000000
broadcast00001010.00000000.01000011.11111111
green = network part, grey = host part
hex0x0a004300
decimal167789312
reverse dns0.67.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:4300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.67.0/3010.0.67.1 – 10.0.67.210.0.67.3
210.0.67.4/3010.0.67.5 – 10.0.67.610.0.67.7
310.0.67.8/3010.0.67.9 – 10.0.67.1010.0.67.11
410.0.67.12/3010.0.67.13 – 10.0.67.1410.0.67.15
510.0.67.16/3010.0.67.17 – 10.0.67.1810.0.67.19
610.0.67.20/3010.0.67.21 – 10.0.67.2210.0.67.23
710.0.67.24/3010.0.67.25 – 10.0.67.2610.0.67.27
810.0.67.28/3010.0.67.29 – 10.0.67.3010.0.67.31
910.0.67.32/3010.0.67.33 – 10.0.67.3410.0.67.35
1010.0.67.36/3010.0.67.37 – 10.0.67.3810.0.67.39
1110.0.67.40/3010.0.67.41 – 10.0.67.4210.0.67.43
1210.0.67.44/3010.0.67.45 – 10.0.67.4610.0.67.47
1310.0.67.48/3010.0.67.49 – 10.0.67.5010.0.67.51
1410.0.67.52/3010.0.67.53 – 10.0.67.5410.0.67.55
1510.0.67.56/3010.0.67.57 – 10.0.67.5810.0.67.59
1610.0.67.60/3010.0.67.61 – 10.0.67.6210.0.67.63
1710.0.67.64/3010.0.67.65 – 10.0.67.6610.0.67.67
1810.0.67.68/3010.0.67.69 – 10.0.67.7010.0.67.71
1910.0.67.72/3010.0.67.73 – 10.0.67.7410.0.67.75
2010.0.67.76/3010.0.67.77 – 10.0.67.7810.0.67.79
2110.0.67.80/3010.0.67.81 – 10.0.67.8210.0.67.83
2210.0.67.84/3010.0.67.85 – 10.0.67.8610.0.67.87
2310.0.67.88/3010.0.67.89 – 10.0.67.9010.0.67.91
2410.0.67.92/3010.0.67.93 – 10.0.67.9410.0.67.95
2510.0.67.96/3010.0.67.97 – 10.0.67.9810.0.67.99
2610.0.67.100/3010.0.67.101 – 10.0.67.10210.0.67.103
2710.0.67.104/3010.0.67.105 – 10.0.67.10610.0.67.107
2810.0.67.108/3010.0.67.109 – 10.0.67.11010.0.67.111
2910.0.67.112/3010.0.67.113 – 10.0.67.11410.0.67.115
3010.0.67.116/3010.0.67.117 – 10.0.67.11810.0.67.119
3110.0.67.120/3010.0.67.121 – 10.0.67.12210.0.67.123
3210.0.67.124/3010.0.67.125 – 10.0.67.12610.0.67.127
3310.0.67.128/3010.0.67.129 – 10.0.67.13010.0.67.131
3410.0.67.132/3010.0.67.133 – 10.0.67.13410.0.67.135
3510.0.67.136/3010.0.67.137 – 10.0.67.13810.0.67.139
3610.0.67.140/3010.0.67.141 – 10.0.67.14210.0.67.143
3710.0.67.144/3010.0.67.145 – 10.0.67.14610.0.67.147
3810.0.67.148/3010.0.67.149 – 10.0.67.15010.0.67.151
3910.0.67.152/3010.0.67.153 – 10.0.67.15410.0.67.155
4010.0.67.156/3010.0.67.157 – 10.0.67.15810.0.67.159
4110.0.67.160/3010.0.67.161 – 10.0.67.16210.0.67.163
4210.0.67.164/3010.0.67.165 – 10.0.67.16610.0.67.167
4310.0.67.168/3010.0.67.169 – 10.0.67.17010.0.67.171
4410.0.67.172/3010.0.67.173 – 10.0.67.17410.0.67.175
4510.0.67.176/3010.0.67.177 – 10.0.67.17810.0.67.179
4610.0.67.180/3010.0.67.181 – 10.0.67.18210.0.67.183
4710.0.67.184/3010.0.67.185 – 10.0.67.18610.0.67.187
4810.0.67.188/3010.0.67.189 – 10.0.67.19010.0.67.191
4910.0.67.192/3010.0.67.193 – 10.0.67.19410.0.67.195
5010.0.67.196/3010.0.67.197 – 10.0.67.19810.0.67.199
5110.0.67.200/3010.0.67.201 – 10.0.67.20210.0.67.203
5210.0.67.204/3010.0.67.205 – 10.0.67.20610.0.67.207
5310.0.67.208/3010.0.67.209 – 10.0.67.21010.0.67.211
5410.0.67.212/3010.0.67.213 – 10.0.67.21410.0.67.215
5510.0.67.216/3010.0.67.217 – 10.0.67.21810.0.67.219
5610.0.67.220/3010.0.67.221 – 10.0.67.22210.0.67.223
5710.0.67.224/3010.0.67.225 – 10.0.67.22610.0.67.227
5810.0.67.228/3010.0.67.229 – 10.0.67.23010.0.67.231
5910.0.67.232/3010.0.67.233 – 10.0.67.23410.0.67.235
6010.0.67.236/3010.0.67.237 – 10.0.67.23810.0.67.239
6110.0.67.240/3010.0.67.241 – 10.0.67.24210.0.67.243
6210.0.67.244/3010.0.67.245 – 10.0.67.24610.0.67.247
6310.0.67.248/3010.0.67.249 – 10.0.67.25010.0.67.251
6410.0.67.252/3010.0.67.253 – 10.0.67.25410.0.67.255
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 →