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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)10.85.82.0/24
network10.85.82.0/24
broadcast10.85.82.255
first host10.85.82.1
last host10.85.82.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.85.82.0/24
address00001010.01010101.01010010.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01010101.01010010.00000000
broadcast00001010.01010101.01010010.11111111
green = network part, grey = host part
hex0x0a555200
decimal173363712
reverse dns0.82.85.10.in-addr.arpa
ipv4-mapped::ffff:a55:5200

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.85.82.0/3010.85.82.1 – 10.85.82.210.85.82.3
210.85.82.4/3010.85.82.5 – 10.85.82.610.85.82.7
310.85.82.8/3010.85.82.9 – 10.85.82.1010.85.82.11
410.85.82.12/3010.85.82.13 – 10.85.82.1410.85.82.15
510.85.82.16/3010.85.82.17 – 10.85.82.1810.85.82.19
610.85.82.20/3010.85.82.21 – 10.85.82.2210.85.82.23
710.85.82.24/3010.85.82.25 – 10.85.82.2610.85.82.27
810.85.82.28/3010.85.82.29 – 10.85.82.3010.85.82.31
910.85.82.32/3010.85.82.33 – 10.85.82.3410.85.82.35
1010.85.82.36/3010.85.82.37 – 10.85.82.3810.85.82.39
1110.85.82.40/3010.85.82.41 – 10.85.82.4210.85.82.43
1210.85.82.44/3010.85.82.45 – 10.85.82.4610.85.82.47
1310.85.82.48/3010.85.82.49 – 10.85.82.5010.85.82.51
1410.85.82.52/3010.85.82.53 – 10.85.82.5410.85.82.55
1510.85.82.56/3010.85.82.57 – 10.85.82.5810.85.82.59
1610.85.82.60/3010.85.82.61 – 10.85.82.6210.85.82.63
1710.85.82.64/3010.85.82.65 – 10.85.82.6610.85.82.67
1810.85.82.68/3010.85.82.69 – 10.85.82.7010.85.82.71
1910.85.82.72/3010.85.82.73 – 10.85.82.7410.85.82.75
2010.85.82.76/3010.85.82.77 – 10.85.82.7810.85.82.79
2110.85.82.80/3010.85.82.81 – 10.85.82.8210.85.82.83
2210.85.82.84/3010.85.82.85 – 10.85.82.8610.85.82.87
2310.85.82.88/3010.85.82.89 – 10.85.82.9010.85.82.91
2410.85.82.92/3010.85.82.93 – 10.85.82.9410.85.82.95
2510.85.82.96/3010.85.82.97 – 10.85.82.9810.85.82.99
2610.85.82.100/3010.85.82.101 – 10.85.82.10210.85.82.103
2710.85.82.104/3010.85.82.105 – 10.85.82.10610.85.82.107
2810.85.82.108/3010.85.82.109 – 10.85.82.11010.85.82.111
2910.85.82.112/3010.85.82.113 – 10.85.82.11410.85.82.115
3010.85.82.116/3010.85.82.117 – 10.85.82.11810.85.82.119
3110.85.82.120/3010.85.82.121 – 10.85.82.12210.85.82.123
3210.85.82.124/3010.85.82.125 – 10.85.82.12610.85.82.127
3310.85.82.128/3010.85.82.129 – 10.85.82.13010.85.82.131
3410.85.82.132/3010.85.82.133 – 10.85.82.13410.85.82.135
3510.85.82.136/3010.85.82.137 – 10.85.82.13810.85.82.139
3610.85.82.140/3010.85.82.141 – 10.85.82.14210.85.82.143
3710.85.82.144/3010.85.82.145 – 10.85.82.14610.85.82.147
3810.85.82.148/3010.85.82.149 – 10.85.82.15010.85.82.151
3910.85.82.152/3010.85.82.153 – 10.85.82.15410.85.82.155
4010.85.82.156/3010.85.82.157 – 10.85.82.15810.85.82.159
4110.85.82.160/3010.85.82.161 – 10.85.82.16210.85.82.163
4210.85.82.164/3010.85.82.165 – 10.85.82.16610.85.82.167
4310.85.82.168/3010.85.82.169 – 10.85.82.17010.85.82.171
4410.85.82.172/3010.85.82.173 – 10.85.82.17410.85.82.175
4510.85.82.176/3010.85.82.177 – 10.85.82.17810.85.82.179
4610.85.82.180/3010.85.82.181 – 10.85.82.18210.85.82.183
4710.85.82.184/3010.85.82.185 – 10.85.82.18610.85.82.187
4810.85.82.188/3010.85.82.189 – 10.85.82.19010.85.82.191
4910.85.82.192/3010.85.82.193 – 10.85.82.19410.85.82.195
5010.85.82.196/3010.85.82.197 – 10.85.82.19810.85.82.199
5110.85.82.200/3010.85.82.201 – 10.85.82.20210.85.82.203
5210.85.82.204/3010.85.82.205 – 10.85.82.20610.85.82.207
5310.85.82.208/3010.85.82.209 – 10.85.82.21010.85.82.211
5410.85.82.212/3010.85.82.213 – 10.85.82.21410.85.82.215
5510.85.82.216/3010.85.82.217 – 10.85.82.21810.85.82.219
5610.85.82.220/3010.85.82.221 – 10.85.82.22210.85.82.223
5710.85.82.224/3010.85.82.225 – 10.85.82.22610.85.82.227
5810.85.82.228/3010.85.82.229 – 10.85.82.23010.85.82.231
5910.85.82.232/3010.85.82.233 – 10.85.82.23410.85.82.235
6010.85.82.236/3010.85.82.237 – 10.85.82.23810.85.82.239
6110.85.82.240/3010.85.82.241 – 10.85.82.24210.85.82.243
6210.85.82.244/3010.85.82.245 – 10.85.82.24610.85.82.247
6310.85.82.248/3010.85.82.249 – 10.85.82.25010.85.82.251
6410.85.82.252/3010.85.82.253 – 10.85.82.25410.85.82.255
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 →