ip
ipku.in

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)10.128.2.0/24
network10.128.2.0/24
broadcast10.128.2.255
first host10.128.2.1
last host10.128.2.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.128.2.0/24
address00001010.10000000.00000010.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.10000000.00000010.00000000
broadcast00001010.10000000.00000010.11111111
green = network part, grey = host part
hex0x0a800200
decimal176161280
reverse dns0.2.128.10.in-addr.arpa
ipv4-mapped::ffff:a80:200

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.128.2.0/3010.128.2.1 – 10.128.2.210.128.2.3
210.128.2.4/3010.128.2.5 – 10.128.2.610.128.2.7
310.128.2.8/3010.128.2.9 – 10.128.2.1010.128.2.11
410.128.2.12/3010.128.2.13 – 10.128.2.1410.128.2.15
510.128.2.16/3010.128.2.17 – 10.128.2.1810.128.2.19
610.128.2.20/3010.128.2.21 – 10.128.2.2210.128.2.23
710.128.2.24/3010.128.2.25 – 10.128.2.2610.128.2.27
810.128.2.28/3010.128.2.29 – 10.128.2.3010.128.2.31
910.128.2.32/3010.128.2.33 – 10.128.2.3410.128.2.35
1010.128.2.36/3010.128.2.37 – 10.128.2.3810.128.2.39
1110.128.2.40/3010.128.2.41 – 10.128.2.4210.128.2.43
1210.128.2.44/3010.128.2.45 – 10.128.2.4610.128.2.47
1310.128.2.48/3010.128.2.49 – 10.128.2.5010.128.2.51
1410.128.2.52/3010.128.2.53 – 10.128.2.5410.128.2.55
1510.128.2.56/3010.128.2.57 – 10.128.2.5810.128.2.59
1610.128.2.60/3010.128.2.61 – 10.128.2.6210.128.2.63
1710.128.2.64/3010.128.2.65 – 10.128.2.6610.128.2.67
1810.128.2.68/3010.128.2.69 – 10.128.2.7010.128.2.71
1910.128.2.72/3010.128.2.73 – 10.128.2.7410.128.2.75
2010.128.2.76/3010.128.2.77 – 10.128.2.7810.128.2.79
2110.128.2.80/3010.128.2.81 – 10.128.2.8210.128.2.83
2210.128.2.84/3010.128.2.85 – 10.128.2.8610.128.2.87
2310.128.2.88/3010.128.2.89 – 10.128.2.9010.128.2.91
2410.128.2.92/3010.128.2.93 – 10.128.2.9410.128.2.95
2510.128.2.96/3010.128.2.97 – 10.128.2.9810.128.2.99
2610.128.2.100/3010.128.2.101 – 10.128.2.10210.128.2.103
2710.128.2.104/3010.128.2.105 – 10.128.2.10610.128.2.107
2810.128.2.108/3010.128.2.109 – 10.128.2.11010.128.2.111
2910.128.2.112/3010.128.2.113 – 10.128.2.11410.128.2.115
3010.128.2.116/3010.128.2.117 – 10.128.2.11810.128.2.119
3110.128.2.120/3010.128.2.121 – 10.128.2.12210.128.2.123
3210.128.2.124/3010.128.2.125 – 10.128.2.12610.128.2.127
3310.128.2.128/3010.128.2.129 – 10.128.2.13010.128.2.131
3410.128.2.132/3010.128.2.133 – 10.128.2.13410.128.2.135
3510.128.2.136/3010.128.2.137 – 10.128.2.13810.128.2.139
3610.128.2.140/3010.128.2.141 – 10.128.2.14210.128.2.143
3710.128.2.144/3010.128.2.145 – 10.128.2.14610.128.2.147
3810.128.2.148/3010.128.2.149 – 10.128.2.15010.128.2.151
3910.128.2.152/3010.128.2.153 – 10.128.2.15410.128.2.155
4010.128.2.156/3010.128.2.157 – 10.128.2.15810.128.2.159
4110.128.2.160/3010.128.2.161 – 10.128.2.16210.128.2.163
4210.128.2.164/3010.128.2.165 – 10.128.2.16610.128.2.167
4310.128.2.168/3010.128.2.169 – 10.128.2.17010.128.2.171
4410.128.2.172/3010.128.2.173 – 10.128.2.17410.128.2.175
4510.128.2.176/3010.128.2.177 – 10.128.2.17810.128.2.179
4610.128.2.180/3010.128.2.181 – 10.128.2.18210.128.2.183
4710.128.2.184/3010.128.2.185 – 10.128.2.18610.128.2.187
4810.128.2.188/3010.128.2.189 – 10.128.2.19010.128.2.191
4910.128.2.192/3010.128.2.193 – 10.128.2.19410.128.2.195
5010.128.2.196/3010.128.2.197 – 10.128.2.19810.128.2.199
5110.128.2.200/3010.128.2.201 – 10.128.2.20210.128.2.203
5210.128.2.204/3010.128.2.205 – 10.128.2.20610.128.2.207
5310.128.2.208/3010.128.2.209 – 10.128.2.21010.128.2.211
5410.128.2.212/3010.128.2.213 – 10.128.2.21410.128.2.215
5510.128.2.216/3010.128.2.217 – 10.128.2.21810.128.2.219
5610.128.2.220/3010.128.2.221 – 10.128.2.22210.128.2.223
5710.128.2.224/3010.128.2.225 – 10.128.2.22610.128.2.227
5810.128.2.228/3010.128.2.229 – 10.128.2.23010.128.2.231
5910.128.2.232/3010.128.2.233 – 10.128.2.23410.128.2.235
6010.128.2.236/3010.128.2.237 – 10.128.2.23810.128.2.239
6110.128.2.240/3010.128.2.241 – 10.128.2.24210.128.2.243
6210.128.2.244/3010.128.2.245 – 10.128.2.24610.128.2.247
6310.128.2.248/3010.128.2.249 – 10.128.2.25010.128.2.251
6410.128.2.252/3010.128.2.253 – 10.128.2.25410.128.2.255
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 →