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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)10.167.203.0/24
network10.167.203.0/24
broadcast10.167.203.255
first host10.167.203.1
last host10.167.203.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.167.203.0/24
address00001010.10100111.11001011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10100111.11001011.00000000
broadcast00001010.10100111.11001011.11111111
green = network part, grey = host part
hex0x0aa7cb00
decimal178768640
reverse dns0.203.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:cb00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.203.0/3010.167.203.1 – 10.167.203.210.167.203.3
210.167.203.4/3010.167.203.5 – 10.167.203.610.167.203.7
310.167.203.8/3010.167.203.9 – 10.167.203.1010.167.203.11
410.167.203.12/3010.167.203.13 – 10.167.203.1410.167.203.15
510.167.203.16/3010.167.203.17 – 10.167.203.1810.167.203.19
610.167.203.20/3010.167.203.21 – 10.167.203.2210.167.203.23
710.167.203.24/3010.167.203.25 – 10.167.203.2610.167.203.27
810.167.203.28/3010.167.203.29 – 10.167.203.3010.167.203.31
910.167.203.32/3010.167.203.33 – 10.167.203.3410.167.203.35
1010.167.203.36/3010.167.203.37 – 10.167.203.3810.167.203.39
1110.167.203.40/3010.167.203.41 – 10.167.203.4210.167.203.43
1210.167.203.44/3010.167.203.45 – 10.167.203.4610.167.203.47
1310.167.203.48/3010.167.203.49 – 10.167.203.5010.167.203.51
1410.167.203.52/3010.167.203.53 – 10.167.203.5410.167.203.55
1510.167.203.56/3010.167.203.57 – 10.167.203.5810.167.203.59
1610.167.203.60/3010.167.203.61 – 10.167.203.6210.167.203.63
1710.167.203.64/3010.167.203.65 – 10.167.203.6610.167.203.67
1810.167.203.68/3010.167.203.69 – 10.167.203.7010.167.203.71
1910.167.203.72/3010.167.203.73 – 10.167.203.7410.167.203.75
2010.167.203.76/3010.167.203.77 – 10.167.203.7810.167.203.79
2110.167.203.80/3010.167.203.81 – 10.167.203.8210.167.203.83
2210.167.203.84/3010.167.203.85 – 10.167.203.8610.167.203.87
2310.167.203.88/3010.167.203.89 – 10.167.203.9010.167.203.91
2410.167.203.92/3010.167.203.93 – 10.167.203.9410.167.203.95
2510.167.203.96/3010.167.203.97 – 10.167.203.9810.167.203.99
2610.167.203.100/3010.167.203.101 – 10.167.203.10210.167.203.103
2710.167.203.104/3010.167.203.105 – 10.167.203.10610.167.203.107
2810.167.203.108/3010.167.203.109 – 10.167.203.11010.167.203.111
2910.167.203.112/3010.167.203.113 – 10.167.203.11410.167.203.115
3010.167.203.116/3010.167.203.117 – 10.167.203.11810.167.203.119
3110.167.203.120/3010.167.203.121 – 10.167.203.12210.167.203.123
3210.167.203.124/3010.167.203.125 – 10.167.203.12610.167.203.127
3310.167.203.128/3010.167.203.129 – 10.167.203.13010.167.203.131
3410.167.203.132/3010.167.203.133 – 10.167.203.13410.167.203.135
3510.167.203.136/3010.167.203.137 – 10.167.203.13810.167.203.139
3610.167.203.140/3010.167.203.141 – 10.167.203.14210.167.203.143
3710.167.203.144/3010.167.203.145 – 10.167.203.14610.167.203.147
3810.167.203.148/3010.167.203.149 – 10.167.203.15010.167.203.151
3910.167.203.152/3010.167.203.153 – 10.167.203.15410.167.203.155
4010.167.203.156/3010.167.203.157 – 10.167.203.15810.167.203.159
4110.167.203.160/3010.167.203.161 – 10.167.203.16210.167.203.163
4210.167.203.164/3010.167.203.165 – 10.167.203.16610.167.203.167
4310.167.203.168/3010.167.203.169 – 10.167.203.17010.167.203.171
4410.167.203.172/3010.167.203.173 – 10.167.203.17410.167.203.175
4510.167.203.176/3010.167.203.177 – 10.167.203.17810.167.203.179
4610.167.203.180/3010.167.203.181 – 10.167.203.18210.167.203.183
4710.167.203.184/3010.167.203.185 – 10.167.203.18610.167.203.187
4810.167.203.188/3010.167.203.189 – 10.167.203.19010.167.203.191
4910.167.203.192/3010.167.203.193 – 10.167.203.19410.167.203.195
5010.167.203.196/3010.167.203.197 – 10.167.203.19810.167.203.199
5110.167.203.200/3010.167.203.201 – 10.167.203.20210.167.203.203
5210.167.203.204/3010.167.203.205 – 10.167.203.20610.167.203.207
5310.167.203.208/3010.167.203.209 – 10.167.203.21010.167.203.211
5410.167.203.212/3010.167.203.213 – 10.167.203.21410.167.203.215
5510.167.203.216/3010.167.203.217 – 10.167.203.21810.167.203.219
5610.167.203.220/3010.167.203.221 – 10.167.203.22210.167.203.223
5710.167.203.224/3010.167.203.225 – 10.167.203.22610.167.203.227
5810.167.203.228/3010.167.203.229 – 10.167.203.23010.167.203.231
5910.167.203.232/3010.167.203.233 – 10.167.203.23410.167.203.235
6010.167.203.236/3010.167.203.237 – 10.167.203.23810.167.203.239
6110.167.203.240/3010.167.203.241 – 10.167.203.24210.167.203.243
6210.167.203.244/3010.167.203.245 – 10.167.203.24610.167.203.247
6310.167.203.248/3010.167.203.249 – 10.167.203.25010.167.203.251
6410.167.203.252/3010.167.203.253 – 10.167.203.25410.167.203.255
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 →