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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)10.131.111.0/24
network10.131.111.0/24
broadcast10.131.111.255
first host10.131.111.1
last host10.131.111.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.131.111.0/24
address00001010.10000011.01101111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10000011.01101111.00000000
broadcast00001010.10000011.01101111.11111111
green = network part, grey = host part
hex0x0a836f00
decimal176385792
reverse dns0.111.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:6f00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.131.111.0/3010.131.111.1 – 10.131.111.210.131.111.3
210.131.111.4/3010.131.111.5 – 10.131.111.610.131.111.7
310.131.111.8/3010.131.111.9 – 10.131.111.1010.131.111.11
410.131.111.12/3010.131.111.13 – 10.131.111.1410.131.111.15
510.131.111.16/3010.131.111.17 – 10.131.111.1810.131.111.19
610.131.111.20/3010.131.111.21 – 10.131.111.2210.131.111.23
710.131.111.24/3010.131.111.25 – 10.131.111.2610.131.111.27
810.131.111.28/3010.131.111.29 – 10.131.111.3010.131.111.31
910.131.111.32/3010.131.111.33 – 10.131.111.3410.131.111.35
1010.131.111.36/3010.131.111.37 – 10.131.111.3810.131.111.39
1110.131.111.40/3010.131.111.41 – 10.131.111.4210.131.111.43
1210.131.111.44/3010.131.111.45 – 10.131.111.4610.131.111.47
1310.131.111.48/3010.131.111.49 – 10.131.111.5010.131.111.51
1410.131.111.52/3010.131.111.53 – 10.131.111.5410.131.111.55
1510.131.111.56/3010.131.111.57 – 10.131.111.5810.131.111.59
1610.131.111.60/3010.131.111.61 – 10.131.111.6210.131.111.63
1710.131.111.64/3010.131.111.65 – 10.131.111.6610.131.111.67
1810.131.111.68/3010.131.111.69 – 10.131.111.7010.131.111.71
1910.131.111.72/3010.131.111.73 – 10.131.111.7410.131.111.75
2010.131.111.76/3010.131.111.77 – 10.131.111.7810.131.111.79
2110.131.111.80/3010.131.111.81 – 10.131.111.8210.131.111.83
2210.131.111.84/3010.131.111.85 – 10.131.111.8610.131.111.87
2310.131.111.88/3010.131.111.89 – 10.131.111.9010.131.111.91
2410.131.111.92/3010.131.111.93 – 10.131.111.9410.131.111.95
2510.131.111.96/3010.131.111.97 – 10.131.111.9810.131.111.99
2610.131.111.100/3010.131.111.101 – 10.131.111.10210.131.111.103
2710.131.111.104/3010.131.111.105 – 10.131.111.10610.131.111.107
2810.131.111.108/3010.131.111.109 – 10.131.111.11010.131.111.111
2910.131.111.112/3010.131.111.113 – 10.131.111.11410.131.111.115
3010.131.111.116/3010.131.111.117 – 10.131.111.11810.131.111.119
3110.131.111.120/3010.131.111.121 – 10.131.111.12210.131.111.123
3210.131.111.124/3010.131.111.125 – 10.131.111.12610.131.111.127
3310.131.111.128/3010.131.111.129 – 10.131.111.13010.131.111.131
3410.131.111.132/3010.131.111.133 – 10.131.111.13410.131.111.135
3510.131.111.136/3010.131.111.137 – 10.131.111.13810.131.111.139
3610.131.111.140/3010.131.111.141 – 10.131.111.14210.131.111.143
3710.131.111.144/3010.131.111.145 – 10.131.111.14610.131.111.147
3810.131.111.148/3010.131.111.149 – 10.131.111.15010.131.111.151
3910.131.111.152/3010.131.111.153 – 10.131.111.15410.131.111.155
4010.131.111.156/3010.131.111.157 – 10.131.111.15810.131.111.159
4110.131.111.160/3010.131.111.161 – 10.131.111.16210.131.111.163
4210.131.111.164/3010.131.111.165 – 10.131.111.16610.131.111.167
4310.131.111.168/3010.131.111.169 – 10.131.111.17010.131.111.171
4410.131.111.172/3010.131.111.173 – 10.131.111.17410.131.111.175
4510.131.111.176/3010.131.111.177 – 10.131.111.17810.131.111.179
4610.131.111.180/3010.131.111.181 – 10.131.111.18210.131.111.183
4710.131.111.184/3010.131.111.185 – 10.131.111.18610.131.111.187
4810.131.111.188/3010.131.111.189 – 10.131.111.19010.131.111.191
4910.131.111.192/3010.131.111.193 – 10.131.111.19410.131.111.195
5010.131.111.196/3010.131.111.197 – 10.131.111.19810.131.111.199
5110.131.111.200/3010.131.111.201 – 10.131.111.20210.131.111.203
5210.131.111.204/3010.131.111.205 – 10.131.111.20610.131.111.207
5310.131.111.208/3010.131.111.209 – 10.131.111.21010.131.111.211
5410.131.111.212/3010.131.111.213 – 10.131.111.21410.131.111.215
5510.131.111.216/3010.131.111.217 – 10.131.111.21810.131.111.219
5610.131.111.220/3010.131.111.221 – 10.131.111.22210.131.111.223
5710.131.111.224/3010.131.111.225 – 10.131.111.22610.131.111.227
5810.131.111.228/3010.131.111.229 – 10.131.111.23010.131.111.231
5910.131.111.232/3010.131.111.233 – 10.131.111.23410.131.111.235
6010.131.111.236/3010.131.111.237 – 10.131.111.23810.131.111.239
6110.131.111.240/3010.131.111.241 – 10.131.111.24210.131.111.243
6210.131.111.244/3010.131.111.245 – 10.131.111.24610.131.111.247
6310.131.111.248/3010.131.111.249 – 10.131.111.25010.131.111.251
6410.131.111.252/3010.131.111.253 – 10.131.111.25410.131.111.255
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 →