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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)10.0.187.0/24
network10.0.187.0/24
broadcast10.0.187.255
first host10.0.187.1
last host10.0.187.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.187.0/24
address00001010.00000000.10111011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.10111011.00000000
broadcast00001010.00000000.10111011.11111111
green = network part, grey = host part
hex0x0a00bb00
decimal167820032
reverse dns0.187.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:bb00

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.187.0/3010.0.187.1 – 10.0.187.210.0.187.3
210.0.187.4/3010.0.187.5 – 10.0.187.610.0.187.7
310.0.187.8/3010.0.187.9 – 10.0.187.1010.0.187.11
410.0.187.12/3010.0.187.13 – 10.0.187.1410.0.187.15
510.0.187.16/3010.0.187.17 – 10.0.187.1810.0.187.19
610.0.187.20/3010.0.187.21 – 10.0.187.2210.0.187.23
710.0.187.24/3010.0.187.25 – 10.0.187.2610.0.187.27
810.0.187.28/3010.0.187.29 – 10.0.187.3010.0.187.31
910.0.187.32/3010.0.187.33 – 10.0.187.3410.0.187.35
1010.0.187.36/3010.0.187.37 – 10.0.187.3810.0.187.39
1110.0.187.40/3010.0.187.41 – 10.0.187.4210.0.187.43
1210.0.187.44/3010.0.187.45 – 10.0.187.4610.0.187.47
1310.0.187.48/3010.0.187.49 – 10.0.187.5010.0.187.51
1410.0.187.52/3010.0.187.53 – 10.0.187.5410.0.187.55
1510.0.187.56/3010.0.187.57 – 10.0.187.5810.0.187.59
1610.0.187.60/3010.0.187.61 – 10.0.187.6210.0.187.63
1710.0.187.64/3010.0.187.65 – 10.0.187.6610.0.187.67
1810.0.187.68/3010.0.187.69 – 10.0.187.7010.0.187.71
1910.0.187.72/3010.0.187.73 – 10.0.187.7410.0.187.75
2010.0.187.76/3010.0.187.77 – 10.0.187.7810.0.187.79
2110.0.187.80/3010.0.187.81 – 10.0.187.8210.0.187.83
2210.0.187.84/3010.0.187.85 – 10.0.187.8610.0.187.87
2310.0.187.88/3010.0.187.89 – 10.0.187.9010.0.187.91
2410.0.187.92/3010.0.187.93 – 10.0.187.9410.0.187.95
2510.0.187.96/3010.0.187.97 – 10.0.187.9810.0.187.99
2610.0.187.100/3010.0.187.101 – 10.0.187.10210.0.187.103
2710.0.187.104/3010.0.187.105 – 10.0.187.10610.0.187.107
2810.0.187.108/3010.0.187.109 – 10.0.187.11010.0.187.111
2910.0.187.112/3010.0.187.113 – 10.0.187.11410.0.187.115
3010.0.187.116/3010.0.187.117 – 10.0.187.11810.0.187.119
3110.0.187.120/3010.0.187.121 – 10.0.187.12210.0.187.123
3210.0.187.124/3010.0.187.125 – 10.0.187.12610.0.187.127
3310.0.187.128/3010.0.187.129 – 10.0.187.13010.0.187.131
3410.0.187.132/3010.0.187.133 – 10.0.187.13410.0.187.135
3510.0.187.136/3010.0.187.137 – 10.0.187.13810.0.187.139
3610.0.187.140/3010.0.187.141 – 10.0.187.14210.0.187.143
3710.0.187.144/3010.0.187.145 – 10.0.187.14610.0.187.147
3810.0.187.148/3010.0.187.149 – 10.0.187.15010.0.187.151
3910.0.187.152/3010.0.187.153 – 10.0.187.15410.0.187.155
4010.0.187.156/3010.0.187.157 – 10.0.187.15810.0.187.159
4110.0.187.160/3010.0.187.161 – 10.0.187.16210.0.187.163
4210.0.187.164/3010.0.187.165 – 10.0.187.16610.0.187.167
4310.0.187.168/3010.0.187.169 – 10.0.187.17010.0.187.171
4410.0.187.172/3010.0.187.173 – 10.0.187.17410.0.187.175
4510.0.187.176/3010.0.187.177 – 10.0.187.17810.0.187.179
4610.0.187.180/3010.0.187.181 – 10.0.187.18210.0.187.183
4710.0.187.184/3010.0.187.185 – 10.0.187.18610.0.187.187
4810.0.187.188/3010.0.187.189 – 10.0.187.19010.0.187.191
4910.0.187.192/3010.0.187.193 – 10.0.187.19410.0.187.195
5010.0.187.196/3010.0.187.197 – 10.0.187.19810.0.187.199
5110.0.187.200/3010.0.187.201 – 10.0.187.20210.0.187.203
5210.0.187.204/3010.0.187.205 – 10.0.187.20610.0.187.207
5310.0.187.208/3010.0.187.209 – 10.0.187.21010.0.187.211
5410.0.187.212/3010.0.187.213 – 10.0.187.21410.0.187.215
5510.0.187.216/3010.0.187.217 – 10.0.187.21810.0.187.219
5610.0.187.220/3010.0.187.221 – 10.0.187.22210.0.187.223
5710.0.187.224/3010.0.187.225 – 10.0.187.22610.0.187.227
5810.0.187.228/3010.0.187.229 – 10.0.187.23010.0.187.231
5910.0.187.232/3010.0.187.233 – 10.0.187.23410.0.187.235
6010.0.187.236/3010.0.187.237 – 10.0.187.23810.0.187.239
6110.0.187.240/3010.0.187.241 – 10.0.187.24210.0.187.243
6210.0.187.244/3010.0.187.245 – 10.0.187.24610.0.187.247
6310.0.187.248/3010.0.187.249 – 10.0.187.25010.0.187.251
6410.0.187.252/3010.0.187.253 – 10.0.187.25410.0.187.255
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 →