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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)10.167.251.0/24
network10.167.251.0/24
broadcast10.167.251.255
first host10.167.251.1
last host10.167.251.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.167.251.0/24
address00001010.10100111.11111011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10100111.11111011.00000000
broadcast00001010.10100111.11111011.11111111
green = network part, grey = host part
hex0x0aa7fb00
decimal178780928
reverse dns0.251.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:fb00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.251.0/3010.167.251.1 – 10.167.251.210.167.251.3
210.167.251.4/3010.167.251.5 – 10.167.251.610.167.251.7
310.167.251.8/3010.167.251.9 – 10.167.251.1010.167.251.11
410.167.251.12/3010.167.251.13 – 10.167.251.1410.167.251.15
510.167.251.16/3010.167.251.17 – 10.167.251.1810.167.251.19
610.167.251.20/3010.167.251.21 – 10.167.251.2210.167.251.23
710.167.251.24/3010.167.251.25 – 10.167.251.2610.167.251.27
810.167.251.28/3010.167.251.29 – 10.167.251.3010.167.251.31
910.167.251.32/3010.167.251.33 – 10.167.251.3410.167.251.35
1010.167.251.36/3010.167.251.37 – 10.167.251.3810.167.251.39
1110.167.251.40/3010.167.251.41 – 10.167.251.4210.167.251.43
1210.167.251.44/3010.167.251.45 – 10.167.251.4610.167.251.47
1310.167.251.48/3010.167.251.49 – 10.167.251.5010.167.251.51
1410.167.251.52/3010.167.251.53 – 10.167.251.5410.167.251.55
1510.167.251.56/3010.167.251.57 – 10.167.251.5810.167.251.59
1610.167.251.60/3010.167.251.61 – 10.167.251.6210.167.251.63
1710.167.251.64/3010.167.251.65 – 10.167.251.6610.167.251.67
1810.167.251.68/3010.167.251.69 – 10.167.251.7010.167.251.71
1910.167.251.72/3010.167.251.73 – 10.167.251.7410.167.251.75
2010.167.251.76/3010.167.251.77 – 10.167.251.7810.167.251.79
2110.167.251.80/3010.167.251.81 – 10.167.251.8210.167.251.83
2210.167.251.84/3010.167.251.85 – 10.167.251.8610.167.251.87
2310.167.251.88/3010.167.251.89 – 10.167.251.9010.167.251.91
2410.167.251.92/3010.167.251.93 – 10.167.251.9410.167.251.95
2510.167.251.96/3010.167.251.97 – 10.167.251.9810.167.251.99
2610.167.251.100/3010.167.251.101 – 10.167.251.10210.167.251.103
2710.167.251.104/3010.167.251.105 – 10.167.251.10610.167.251.107
2810.167.251.108/3010.167.251.109 – 10.167.251.11010.167.251.111
2910.167.251.112/3010.167.251.113 – 10.167.251.11410.167.251.115
3010.167.251.116/3010.167.251.117 – 10.167.251.11810.167.251.119
3110.167.251.120/3010.167.251.121 – 10.167.251.12210.167.251.123
3210.167.251.124/3010.167.251.125 – 10.167.251.12610.167.251.127
3310.167.251.128/3010.167.251.129 – 10.167.251.13010.167.251.131
3410.167.251.132/3010.167.251.133 – 10.167.251.13410.167.251.135
3510.167.251.136/3010.167.251.137 – 10.167.251.13810.167.251.139
3610.167.251.140/3010.167.251.141 – 10.167.251.14210.167.251.143
3710.167.251.144/3010.167.251.145 – 10.167.251.14610.167.251.147
3810.167.251.148/3010.167.251.149 – 10.167.251.15010.167.251.151
3910.167.251.152/3010.167.251.153 – 10.167.251.15410.167.251.155
4010.167.251.156/3010.167.251.157 – 10.167.251.15810.167.251.159
4110.167.251.160/3010.167.251.161 – 10.167.251.16210.167.251.163
4210.167.251.164/3010.167.251.165 – 10.167.251.16610.167.251.167
4310.167.251.168/3010.167.251.169 – 10.167.251.17010.167.251.171
4410.167.251.172/3010.167.251.173 – 10.167.251.17410.167.251.175
4510.167.251.176/3010.167.251.177 – 10.167.251.17810.167.251.179
4610.167.251.180/3010.167.251.181 – 10.167.251.18210.167.251.183
4710.167.251.184/3010.167.251.185 – 10.167.251.18610.167.251.187
4810.167.251.188/3010.167.251.189 – 10.167.251.19010.167.251.191
4910.167.251.192/3010.167.251.193 – 10.167.251.19410.167.251.195
5010.167.251.196/3010.167.251.197 – 10.167.251.19810.167.251.199
5110.167.251.200/3010.167.251.201 – 10.167.251.20210.167.251.203
5210.167.251.204/3010.167.251.205 – 10.167.251.20610.167.251.207
5310.167.251.208/3010.167.251.209 – 10.167.251.21010.167.251.211
5410.167.251.212/3010.167.251.213 – 10.167.251.21410.167.251.215
5510.167.251.216/3010.167.251.217 – 10.167.251.21810.167.251.219
5610.167.251.220/3010.167.251.221 – 10.167.251.22210.167.251.223
5710.167.251.224/3010.167.251.225 – 10.167.251.22610.167.251.227
5810.167.251.228/3010.167.251.229 – 10.167.251.23010.167.251.231
5910.167.251.232/3010.167.251.233 – 10.167.251.23410.167.251.235
6010.167.251.236/3010.167.251.237 – 10.167.251.23810.167.251.239
6110.167.251.240/3010.167.251.241 – 10.167.251.24210.167.251.243
6210.167.251.244/3010.167.251.245 – 10.167.251.24610.167.251.247
6310.167.251.248/3010.167.251.249 – 10.167.251.25010.167.251.251
6410.167.251.252/3010.167.251.253 – 10.167.251.25410.167.251.255
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 →