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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)10.2.164.0/24
network10.2.164.0/24
broadcast10.2.164.255
first host10.2.164.1
last host10.2.164.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.164.0/24
address00001010.00000010.10100100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.10100100.00000000
broadcast00001010.00000010.10100100.11111111
green = network part, grey = host part
hex0x0a02a400
decimal167945216
reverse dns0.164.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:a400

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.164.0/3010.2.164.1 – 10.2.164.210.2.164.3
210.2.164.4/3010.2.164.5 – 10.2.164.610.2.164.7
310.2.164.8/3010.2.164.9 – 10.2.164.1010.2.164.11
410.2.164.12/3010.2.164.13 – 10.2.164.1410.2.164.15
510.2.164.16/3010.2.164.17 – 10.2.164.1810.2.164.19
610.2.164.20/3010.2.164.21 – 10.2.164.2210.2.164.23
710.2.164.24/3010.2.164.25 – 10.2.164.2610.2.164.27
810.2.164.28/3010.2.164.29 – 10.2.164.3010.2.164.31
910.2.164.32/3010.2.164.33 – 10.2.164.3410.2.164.35
1010.2.164.36/3010.2.164.37 – 10.2.164.3810.2.164.39
1110.2.164.40/3010.2.164.41 – 10.2.164.4210.2.164.43
1210.2.164.44/3010.2.164.45 – 10.2.164.4610.2.164.47
1310.2.164.48/3010.2.164.49 – 10.2.164.5010.2.164.51
1410.2.164.52/3010.2.164.53 – 10.2.164.5410.2.164.55
1510.2.164.56/3010.2.164.57 – 10.2.164.5810.2.164.59
1610.2.164.60/3010.2.164.61 – 10.2.164.6210.2.164.63
1710.2.164.64/3010.2.164.65 – 10.2.164.6610.2.164.67
1810.2.164.68/3010.2.164.69 – 10.2.164.7010.2.164.71
1910.2.164.72/3010.2.164.73 – 10.2.164.7410.2.164.75
2010.2.164.76/3010.2.164.77 – 10.2.164.7810.2.164.79
2110.2.164.80/3010.2.164.81 – 10.2.164.8210.2.164.83
2210.2.164.84/3010.2.164.85 – 10.2.164.8610.2.164.87
2310.2.164.88/3010.2.164.89 – 10.2.164.9010.2.164.91
2410.2.164.92/3010.2.164.93 – 10.2.164.9410.2.164.95
2510.2.164.96/3010.2.164.97 – 10.2.164.9810.2.164.99
2610.2.164.100/3010.2.164.101 – 10.2.164.10210.2.164.103
2710.2.164.104/3010.2.164.105 – 10.2.164.10610.2.164.107
2810.2.164.108/3010.2.164.109 – 10.2.164.11010.2.164.111
2910.2.164.112/3010.2.164.113 – 10.2.164.11410.2.164.115
3010.2.164.116/3010.2.164.117 – 10.2.164.11810.2.164.119
3110.2.164.120/3010.2.164.121 – 10.2.164.12210.2.164.123
3210.2.164.124/3010.2.164.125 – 10.2.164.12610.2.164.127
3310.2.164.128/3010.2.164.129 – 10.2.164.13010.2.164.131
3410.2.164.132/3010.2.164.133 – 10.2.164.13410.2.164.135
3510.2.164.136/3010.2.164.137 – 10.2.164.13810.2.164.139
3610.2.164.140/3010.2.164.141 – 10.2.164.14210.2.164.143
3710.2.164.144/3010.2.164.145 – 10.2.164.14610.2.164.147
3810.2.164.148/3010.2.164.149 – 10.2.164.15010.2.164.151
3910.2.164.152/3010.2.164.153 – 10.2.164.15410.2.164.155
4010.2.164.156/3010.2.164.157 – 10.2.164.15810.2.164.159
4110.2.164.160/3010.2.164.161 – 10.2.164.16210.2.164.163
4210.2.164.164/3010.2.164.165 – 10.2.164.16610.2.164.167
4310.2.164.168/3010.2.164.169 – 10.2.164.17010.2.164.171
4410.2.164.172/3010.2.164.173 – 10.2.164.17410.2.164.175
4510.2.164.176/3010.2.164.177 – 10.2.164.17810.2.164.179
4610.2.164.180/3010.2.164.181 – 10.2.164.18210.2.164.183
4710.2.164.184/3010.2.164.185 – 10.2.164.18610.2.164.187
4810.2.164.188/3010.2.164.189 – 10.2.164.19010.2.164.191
4910.2.164.192/3010.2.164.193 – 10.2.164.19410.2.164.195
5010.2.164.196/3010.2.164.197 – 10.2.164.19810.2.164.199
5110.2.164.200/3010.2.164.201 – 10.2.164.20210.2.164.203
5210.2.164.204/3010.2.164.205 – 10.2.164.20610.2.164.207
5310.2.164.208/3010.2.164.209 – 10.2.164.21010.2.164.211
5410.2.164.212/3010.2.164.213 – 10.2.164.21410.2.164.215
5510.2.164.216/3010.2.164.217 – 10.2.164.21810.2.164.219
5610.2.164.220/3010.2.164.221 – 10.2.164.22210.2.164.223
5710.2.164.224/3010.2.164.225 – 10.2.164.22610.2.164.227
5810.2.164.228/3010.2.164.229 – 10.2.164.23010.2.164.231
5910.2.164.232/3010.2.164.233 – 10.2.164.23410.2.164.235
6010.2.164.236/3010.2.164.237 – 10.2.164.23810.2.164.239
6110.2.164.240/3010.2.164.241 – 10.2.164.24210.2.164.243
6210.2.164.244/3010.2.164.245 – 10.2.164.24610.2.164.247
6310.2.164.248/3010.2.164.249 – 10.2.164.25010.2.164.251
6410.2.164.252/3010.2.164.253 – 10.2.164.25410.2.164.255
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 →