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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)10.87.71.0/24
network10.87.71.0/24
broadcast10.87.71.255
first host10.87.71.1
last host10.87.71.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.87.71.0/24
address00001010.01010111.01000111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01010111.01000111.00000000
broadcast00001010.01010111.01000111.11111111
green = network part, grey = host part
hex0x0a574700
decimal173491968
reverse dns0.71.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:4700

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.87.71.0/3010.87.71.1 – 10.87.71.210.87.71.3
210.87.71.4/3010.87.71.5 – 10.87.71.610.87.71.7
310.87.71.8/3010.87.71.9 – 10.87.71.1010.87.71.11
410.87.71.12/3010.87.71.13 – 10.87.71.1410.87.71.15
510.87.71.16/3010.87.71.17 – 10.87.71.1810.87.71.19
610.87.71.20/3010.87.71.21 – 10.87.71.2210.87.71.23
710.87.71.24/3010.87.71.25 – 10.87.71.2610.87.71.27
810.87.71.28/3010.87.71.29 – 10.87.71.3010.87.71.31
910.87.71.32/3010.87.71.33 – 10.87.71.3410.87.71.35
1010.87.71.36/3010.87.71.37 – 10.87.71.3810.87.71.39
1110.87.71.40/3010.87.71.41 – 10.87.71.4210.87.71.43
1210.87.71.44/3010.87.71.45 – 10.87.71.4610.87.71.47
1310.87.71.48/3010.87.71.49 – 10.87.71.5010.87.71.51
1410.87.71.52/3010.87.71.53 – 10.87.71.5410.87.71.55
1510.87.71.56/3010.87.71.57 – 10.87.71.5810.87.71.59
1610.87.71.60/3010.87.71.61 – 10.87.71.6210.87.71.63
1710.87.71.64/3010.87.71.65 – 10.87.71.6610.87.71.67
1810.87.71.68/3010.87.71.69 – 10.87.71.7010.87.71.71
1910.87.71.72/3010.87.71.73 – 10.87.71.7410.87.71.75
2010.87.71.76/3010.87.71.77 – 10.87.71.7810.87.71.79
2110.87.71.80/3010.87.71.81 – 10.87.71.8210.87.71.83
2210.87.71.84/3010.87.71.85 – 10.87.71.8610.87.71.87
2310.87.71.88/3010.87.71.89 – 10.87.71.9010.87.71.91
2410.87.71.92/3010.87.71.93 – 10.87.71.9410.87.71.95
2510.87.71.96/3010.87.71.97 – 10.87.71.9810.87.71.99
2610.87.71.100/3010.87.71.101 – 10.87.71.10210.87.71.103
2710.87.71.104/3010.87.71.105 – 10.87.71.10610.87.71.107
2810.87.71.108/3010.87.71.109 – 10.87.71.11010.87.71.111
2910.87.71.112/3010.87.71.113 – 10.87.71.11410.87.71.115
3010.87.71.116/3010.87.71.117 – 10.87.71.11810.87.71.119
3110.87.71.120/3010.87.71.121 – 10.87.71.12210.87.71.123
3210.87.71.124/3010.87.71.125 – 10.87.71.12610.87.71.127
3310.87.71.128/3010.87.71.129 – 10.87.71.13010.87.71.131
3410.87.71.132/3010.87.71.133 – 10.87.71.13410.87.71.135
3510.87.71.136/3010.87.71.137 – 10.87.71.13810.87.71.139
3610.87.71.140/3010.87.71.141 – 10.87.71.14210.87.71.143
3710.87.71.144/3010.87.71.145 – 10.87.71.14610.87.71.147
3810.87.71.148/3010.87.71.149 – 10.87.71.15010.87.71.151
3910.87.71.152/3010.87.71.153 – 10.87.71.15410.87.71.155
4010.87.71.156/3010.87.71.157 – 10.87.71.15810.87.71.159
4110.87.71.160/3010.87.71.161 – 10.87.71.16210.87.71.163
4210.87.71.164/3010.87.71.165 – 10.87.71.16610.87.71.167
4310.87.71.168/3010.87.71.169 – 10.87.71.17010.87.71.171
4410.87.71.172/3010.87.71.173 – 10.87.71.17410.87.71.175
4510.87.71.176/3010.87.71.177 – 10.87.71.17810.87.71.179
4610.87.71.180/3010.87.71.181 – 10.87.71.18210.87.71.183
4710.87.71.184/3010.87.71.185 – 10.87.71.18610.87.71.187
4810.87.71.188/3010.87.71.189 – 10.87.71.19010.87.71.191
4910.87.71.192/3010.87.71.193 – 10.87.71.19410.87.71.195
5010.87.71.196/3010.87.71.197 – 10.87.71.19810.87.71.199
5110.87.71.200/3010.87.71.201 – 10.87.71.20210.87.71.203
5210.87.71.204/3010.87.71.205 – 10.87.71.20610.87.71.207
5310.87.71.208/3010.87.71.209 – 10.87.71.21010.87.71.211
5410.87.71.212/3010.87.71.213 – 10.87.71.21410.87.71.215
5510.87.71.216/3010.87.71.217 – 10.87.71.21810.87.71.219
5610.87.71.220/3010.87.71.221 – 10.87.71.22210.87.71.223
5710.87.71.224/3010.87.71.225 – 10.87.71.22610.87.71.227
5810.87.71.228/3010.87.71.229 – 10.87.71.23010.87.71.231
5910.87.71.232/3010.87.71.233 – 10.87.71.23410.87.71.235
6010.87.71.236/3010.87.71.237 – 10.87.71.23810.87.71.239
6110.87.71.240/3010.87.71.241 – 10.87.71.24210.87.71.243
6210.87.71.244/3010.87.71.245 – 10.87.71.24610.87.71.247
6310.87.71.248/3010.87.71.249 – 10.87.71.25010.87.71.251
6410.87.71.252/3010.87.71.253 – 10.87.71.25410.87.71.255
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 →