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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)10.6.85.0/24
network10.6.85.0/24
broadcast10.6.85.255
first host10.6.85.1
last host10.6.85.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.6.85.0/24
address00001010.00000110.01010101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000110.01010101.00000000
broadcast00001010.00000110.01010101.11111111
green = network part, grey = host part
hex0x0a065500
decimal168187136
reverse dns0.85.6.10.in-addr.arpa
ipv4-mapped::ffff:a06:5500

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.6.85.0/3010.6.85.1 – 10.6.85.210.6.85.3
210.6.85.4/3010.6.85.5 – 10.6.85.610.6.85.7
310.6.85.8/3010.6.85.9 – 10.6.85.1010.6.85.11
410.6.85.12/3010.6.85.13 – 10.6.85.1410.6.85.15
510.6.85.16/3010.6.85.17 – 10.6.85.1810.6.85.19
610.6.85.20/3010.6.85.21 – 10.6.85.2210.6.85.23
710.6.85.24/3010.6.85.25 – 10.6.85.2610.6.85.27
810.6.85.28/3010.6.85.29 – 10.6.85.3010.6.85.31
910.6.85.32/3010.6.85.33 – 10.6.85.3410.6.85.35
1010.6.85.36/3010.6.85.37 – 10.6.85.3810.6.85.39
1110.6.85.40/3010.6.85.41 – 10.6.85.4210.6.85.43
1210.6.85.44/3010.6.85.45 – 10.6.85.4610.6.85.47
1310.6.85.48/3010.6.85.49 – 10.6.85.5010.6.85.51
1410.6.85.52/3010.6.85.53 – 10.6.85.5410.6.85.55
1510.6.85.56/3010.6.85.57 – 10.6.85.5810.6.85.59
1610.6.85.60/3010.6.85.61 – 10.6.85.6210.6.85.63
1710.6.85.64/3010.6.85.65 – 10.6.85.6610.6.85.67
1810.6.85.68/3010.6.85.69 – 10.6.85.7010.6.85.71
1910.6.85.72/3010.6.85.73 – 10.6.85.7410.6.85.75
2010.6.85.76/3010.6.85.77 – 10.6.85.7810.6.85.79
2110.6.85.80/3010.6.85.81 – 10.6.85.8210.6.85.83
2210.6.85.84/3010.6.85.85 – 10.6.85.8610.6.85.87
2310.6.85.88/3010.6.85.89 – 10.6.85.9010.6.85.91
2410.6.85.92/3010.6.85.93 – 10.6.85.9410.6.85.95
2510.6.85.96/3010.6.85.97 – 10.6.85.9810.6.85.99
2610.6.85.100/3010.6.85.101 – 10.6.85.10210.6.85.103
2710.6.85.104/3010.6.85.105 – 10.6.85.10610.6.85.107
2810.6.85.108/3010.6.85.109 – 10.6.85.11010.6.85.111
2910.6.85.112/3010.6.85.113 – 10.6.85.11410.6.85.115
3010.6.85.116/3010.6.85.117 – 10.6.85.11810.6.85.119
3110.6.85.120/3010.6.85.121 – 10.6.85.12210.6.85.123
3210.6.85.124/3010.6.85.125 – 10.6.85.12610.6.85.127
3310.6.85.128/3010.6.85.129 – 10.6.85.13010.6.85.131
3410.6.85.132/3010.6.85.133 – 10.6.85.13410.6.85.135
3510.6.85.136/3010.6.85.137 – 10.6.85.13810.6.85.139
3610.6.85.140/3010.6.85.141 – 10.6.85.14210.6.85.143
3710.6.85.144/3010.6.85.145 – 10.6.85.14610.6.85.147
3810.6.85.148/3010.6.85.149 – 10.6.85.15010.6.85.151
3910.6.85.152/3010.6.85.153 – 10.6.85.15410.6.85.155
4010.6.85.156/3010.6.85.157 – 10.6.85.15810.6.85.159
4110.6.85.160/3010.6.85.161 – 10.6.85.16210.6.85.163
4210.6.85.164/3010.6.85.165 – 10.6.85.16610.6.85.167
4310.6.85.168/3010.6.85.169 – 10.6.85.17010.6.85.171
4410.6.85.172/3010.6.85.173 – 10.6.85.17410.6.85.175
4510.6.85.176/3010.6.85.177 – 10.6.85.17810.6.85.179
4610.6.85.180/3010.6.85.181 – 10.6.85.18210.6.85.183
4710.6.85.184/3010.6.85.185 – 10.6.85.18610.6.85.187
4810.6.85.188/3010.6.85.189 – 10.6.85.19010.6.85.191
4910.6.85.192/3010.6.85.193 – 10.6.85.19410.6.85.195
5010.6.85.196/3010.6.85.197 – 10.6.85.19810.6.85.199
5110.6.85.200/3010.6.85.201 – 10.6.85.20210.6.85.203
5210.6.85.204/3010.6.85.205 – 10.6.85.20610.6.85.207
5310.6.85.208/3010.6.85.209 – 10.6.85.21010.6.85.211
5410.6.85.212/3010.6.85.213 – 10.6.85.21410.6.85.215
5510.6.85.216/3010.6.85.217 – 10.6.85.21810.6.85.219
5610.6.85.220/3010.6.85.221 – 10.6.85.22210.6.85.223
5710.6.85.224/3010.6.85.225 – 10.6.85.22610.6.85.227
5810.6.85.228/3010.6.85.229 – 10.6.85.23010.6.85.231
5910.6.85.232/3010.6.85.233 – 10.6.85.23410.6.85.235
6010.6.85.236/3010.6.85.237 – 10.6.85.23810.6.85.239
6110.6.85.240/3010.6.85.241 – 10.6.85.24210.6.85.243
6210.6.85.244/3010.6.85.245 – 10.6.85.24610.6.85.247
6310.6.85.248/3010.6.85.249 – 10.6.85.25010.6.85.251
6410.6.85.252/3010.6.85.253 – 10.6.85.25410.6.85.255
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 →