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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)10.31.131.0/24
network10.31.131.0/24
broadcast10.31.131.255
first host10.31.131.1
last host10.31.131.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.31.131.0/24
address00001010.00011111.10000011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00011111.10000011.00000000
broadcast00001010.00011111.10000011.11111111
green = network part, grey = host part
hex0x0a1f8300
decimal169837312
reverse dns0.131.31.10.in-addr.arpa
ipv4-mapped::ffff:a1f:8300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.31.131.0/3010.31.131.1 – 10.31.131.210.31.131.3
210.31.131.4/3010.31.131.5 – 10.31.131.610.31.131.7
310.31.131.8/3010.31.131.9 – 10.31.131.1010.31.131.11
410.31.131.12/3010.31.131.13 – 10.31.131.1410.31.131.15
510.31.131.16/3010.31.131.17 – 10.31.131.1810.31.131.19
610.31.131.20/3010.31.131.21 – 10.31.131.2210.31.131.23
710.31.131.24/3010.31.131.25 – 10.31.131.2610.31.131.27
810.31.131.28/3010.31.131.29 – 10.31.131.3010.31.131.31
910.31.131.32/3010.31.131.33 – 10.31.131.3410.31.131.35
1010.31.131.36/3010.31.131.37 – 10.31.131.3810.31.131.39
1110.31.131.40/3010.31.131.41 – 10.31.131.4210.31.131.43
1210.31.131.44/3010.31.131.45 – 10.31.131.4610.31.131.47
1310.31.131.48/3010.31.131.49 – 10.31.131.5010.31.131.51
1410.31.131.52/3010.31.131.53 – 10.31.131.5410.31.131.55
1510.31.131.56/3010.31.131.57 – 10.31.131.5810.31.131.59
1610.31.131.60/3010.31.131.61 – 10.31.131.6210.31.131.63
1710.31.131.64/3010.31.131.65 – 10.31.131.6610.31.131.67
1810.31.131.68/3010.31.131.69 – 10.31.131.7010.31.131.71
1910.31.131.72/3010.31.131.73 – 10.31.131.7410.31.131.75
2010.31.131.76/3010.31.131.77 – 10.31.131.7810.31.131.79
2110.31.131.80/3010.31.131.81 – 10.31.131.8210.31.131.83
2210.31.131.84/3010.31.131.85 – 10.31.131.8610.31.131.87
2310.31.131.88/3010.31.131.89 – 10.31.131.9010.31.131.91
2410.31.131.92/3010.31.131.93 – 10.31.131.9410.31.131.95
2510.31.131.96/3010.31.131.97 – 10.31.131.9810.31.131.99
2610.31.131.100/3010.31.131.101 – 10.31.131.10210.31.131.103
2710.31.131.104/3010.31.131.105 – 10.31.131.10610.31.131.107
2810.31.131.108/3010.31.131.109 – 10.31.131.11010.31.131.111
2910.31.131.112/3010.31.131.113 – 10.31.131.11410.31.131.115
3010.31.131.116/3010.31.131.117 – 10.31.131.11810.31.131.119
3110.31.131.120/3010.31.131.121 – 10.31.131.12210.31.131.123
3210.31.131.124/3010.31.131.125 – 10.31.131.12610.31.131.127
3310.31.131.128/3010.31.131.129 – 10.31.131.13010.31.131.131
3410.31.131.132/3010.31.131.133 – 10.31.131.13410.31.131.135
3510.31.131.136/3010.31.131.137 – 10.31.131.13810.31.131.139
3610.31.131.140/3010.31.131.141 – 10.31.131.14210.31.131.143
3710.31.131.144/3010.31.131.145 – 10.31.131.14610.31.131.147
3810.31.131.148/3010.31.131.149 – 10.31.131.15010.31.131.151
3910.31.131.152/3010.31.131.153 – 10.31.131.15410.31.131.155
4010.31.131.156/3010.31.131.157 – 10.31.131.15810.31.131.159
4110.31.131.160/3010.31.131.161 – 10.31.131.16210.31.131.163
4210.31.131.164/3010.31.131.165 – 10.31.131.16610.31.131.167
4310.31.131.168/3010.31.131.169 – 10.31.131.17010.31.131.171
4410.31.131.172/3010.31.131.173 – 10.31.131.17410.31.131.175
4510.31.131.176/3010.31.131.177 – 10.31.131.17810.31.131.179
4610.31.131.180/3010.31.131.181 – 10.31.131.18210.31.131.183
4710.31.131.184/3010.31.131.185 – 10.31.131.18610.31.131.187
4810.31.131.188/3010.31.131.189 – 10.31.131.19010.31.131.191
4910.31.131.192/3010.31.131.193 – 10.31.131.19410.31.131.195
5010.31.131.196/3010.31.131.197 – 10.31.131.19810.31.131.199
5110.31.131.200/3010.31.131.201 – 10.31.131.20210.31.131.203
5210.31.131.204/3010.31.131.205 – 10.31.131.20610.31.131.207
5310.31.131.208/3010.31.131.209 – 10.31.131.21010.31.131.211
5410.31.131.212/3010.31.131.213 – 10.31.131.21410.31.131.215
5510.31.131.216/3010.31.131.217 – 10.31.131.21810.31.131.219
5610.31.131.220/3010.31.131.221 – 10.31.131.22210.31.131.223
5710.31.131.224/3010.31.131.225 – 10.31.131.22610.31.131.227
5810.31.131.228/3010.31.131.229 – 10.31.131.23010.31.131.231
5910.31.131.232/3010.31.131.233 – 10.31.131.23410.31.131.235
6010.31.131.236/3010.31.131.237 – 10.31.131.23810.31.131.239
6110.31.131.240/3010.31.131.241 – 10.31.131.24210.31.131.243
6210.31.131.244/3010.31.131.245 – 10.31.131.24610.31.131.247
6310.31.131.248/3010.31.131.249 – 10.31.131.25010.31.131.251
6410.31.131.252/3010.31.131.253 – 10.31.131.25410.31.131.255
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 →