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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)10.4.85.0/24
network10.4.85.0/24
broadcast10.4.85.255
first host10.4.85.1
last host10.4.85.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.4.85.0/24
address00001010.00000100.01010101.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000100.01010101.00000000
broadcast00001010.00000100.01010101.11111111
green = network part, grey = host part
hex0x0a045500
decimal168056064
reverse dns0.85.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:5500

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.85.0/3010.4.85.1 – 10.4.85.210.4.85.3
210.4.85.4/3010.4.85.5 – 10.4.85.610.4.85.7
310.4.85.8/3010.4.85.9 – 10.4.85.1010.4.85.11
410.4.85.12/3010.4.85.13 – 10.4.85.1410.4.85.15
510.4.85.16/3010.4.85.17 – 10.4.85.1810.4.85.19
610.4.85.20/3010.4.85.21 – 10.4.85.2210.4.85.23
710.4.85.24/3010.4.85.25 – 10.4.85.2610.4.85.27
810.4.85.28/3010.4.85.29 – 10.4.85.3010.4.85.31
910.4.85.32/3010.4.85.33 – 10.4.85.3410.4.85.35
1010.4.85.36/3010.4.85.37 – 10.4.85.3810.4.85.39
1110.4.85.40/3010.4.85.41 – 10.4.85.4210.4.85.43
1210.4.85.44/3010.4.85.45 – 10.4.85.4610.4.85.47
1310.4.85.48/3010.4.85.49 – 10.4.85.5010.4.85.51
1410.4.85.52/3010.4.85.53 – 10.4.85.5410.4.85.55
1510.4.85.56/3010.4.85.57 – 10.4.85.5810.4.85.59
1610.4.85.60/3010.4.85.61 – 10.4.85.6210.4.85.63
1710.4.85.64/3010.4.85.65 – 10.4.85.6610.4.85.67
1810.4.85.68/3010.4.85.69 – 10.4.85.7010.4.85.71
1910.4.85.72/3010.4.85.73 – 10.4.85.7410.4.85.75
2010.4.85.76/3010.4.85.77 – 10.4.85.7810.4.85.79
2110.4.85.80/3010.4.85.81 – 10.4.85.8210.4.85.83
2210.4.85.84/3010.4.85.85 – 10.4.85.8610.4.85.87
2310.4.85.88/3010.4.85.89 – 10.4.85.9010.4.85.91
2410.4.85.92/3010.4.85.93 – 10.4.85.9410.4.85.95
2510.4.85.96/3010.4.85.97 – 10.4.85.9810.4.85.99
2610.4.85.100/3010.4.85.101 – 10.4.85.10210.4.85.103
2710.4.85.104/3010.4.85.105 – 10.4.85.10610.4.85.107
2810.4.85.108/3010.4.85.109 – 10.4.85.11010.4.85.111
2910.4.85.112/3010.4.85.113 – 10.4.85.11410.4.85.115
3010.4.85.116/3010.4.85.117 – 10.4.85.11810.4.85.119
3110.4.85.120/3010.4.85.121 – 10.4.85.12210.4.85.123
3210.4.85.124/3010.4.85.125 – 10.4.85.12610.4.85.127
3310.4.85.128/3010.4.85.129 – 10.4.85.13010.4.85.131
3410.4.85.132/3010.4.85.133 – 10.4.85.13410.4.85.135
3510.4.85.136/3010.4.85.137 – 10.4.85.13810.4.85.139
3610.4.85.140/3010.4.85.141 – 10.4.85.14210.4.85.143
3710.4.85.144/3010.4.85.145 – 10.4.85.14610.4.85.147
3810.4.85.148/3010.4.85.149 – 10.4.85.15010.4.85.151
3910.4.85.152/3010.4.85.153 – 10.4.85.15410.4.85.155
4010.4.85.156/3010.4.85.157 – 10.4.85.15810.4.85.159
4110.4.85.160/3010.4.85.161 – 10.4.85.16210.4.85.163
4210.4.85.164/3010.4.85.165 – 10.4.85.16610.4.85.167
4310.4.85.168/3010.4.85.169 – 10.4.85.17010.4.85.171
4410.4.85.172/3010.4.85.173 – 10.4.85.17410.4.85.175
4510.4.85.176/3010.4.85.177 – 10.4.85.17810.4.85.179
4610.4.85.180/3010.4.85.181 – 10.4.85.18210.4.85.183
4710.4.85.184/3010.4.85.185 – 10.4.85.18610.4.85.187
4810.4.85.188/3010.4.85.189 – 10.4.85.19010.4.85.191
4910.4.85.192/3010.4.85.193 – 10.4.85.19410.4.85.195
5010.4.85.196/3010.4.85.197 – 10.4.85.19810.4.85.199
5110.4.85.200/3010.4.85.201 – 10.4.85.20210.4.85.203
5210.4.85.204/3010.4.85.205 – 10.4.85.20610.4.85.207
5310.4.85.208/3010.4.85.209 – 10.4.85.21010.4.85.211
5410.4.85.212/3010.4.85.213 – 10.4.85.21410.4.85.215
5510.4.85.216/3010.4.85.217 – 10.4.85.21810.4.85.219
5610.4.85.220/3010.4.85.221 – 10.4.85.22210.4.85.223
5710.4.85.224/3010.4.85.225 – 10.4.85.22610.4.85.227
5810.4.85.228/3010.4.85.229 – 10.4.85.23010.4.85.231
5910.4.85.232/3010.4.85.233 – 10.4.85.23410.4.85.235
6010.4.85.236/3010.4.85.237 – 10.4.85.23810.4.85.239
6110.4.85.240/3010.4.85.241 – 10.4.85.24210.4.85.243
6210.4.85.244/3010.4.85.245 – 10.4.85.24610.4.85.247
6310.4.85.248/3010.4.85.249 – 10.4.85.25010.4.85.251
6410.4.85.252/3010.4.85.253 – 10.4.85.25410.4.85.255
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 →