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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)10.2.18.0/24
network10.2.18.0/24
broadcast10.2.18.255
first host10.2.18.1
last host10.2.18.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.18.0/24
address00001010.00000010.00010010.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00010010.00000000
broadcast00001010.00000010.00010010.11111111
green = network part, grey = host part
hex0x0a021200
decimal167907840
reverse dns0.18.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1200

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.18.0/3010.2.18.1 – 10.2.18.210.2.18.3
210.2.18.4/3010.2.18.5 – 10.2.18.610.2.18.7
310.2.18.8/3010.2.18.9 – 10.2.18.1010.2.18.11
410.2.18.12/3010.2.18.13 – 10.2.18.1410.2.18.15
510.2.18.16/3010.2.18.17 – 10.2.18.1810.2.18.19
610.2.18.20/3010.2.18.21 – 10.2.18.2210.2.18.23
710.2.18.24/3010.2.18.25 – 10.2.18.2610.2.18.27
810.2.18.28/3010.2.18.29 – 10.2.18.3010.2.18.31
910.2.18.32/3010.2.18.33 – 10.2.18.3410.2.18.35
1010.2.18.36/3010.2.18.37 – 10.2.18.3810.2.18.39
1110.2.18.40/3010.2.18.41 – 10.2.18.4210.2.18.43
1210.2.18.44/3010.2.18.45 – 10.2.18.4610.2.18.47
1310.2.18.48/3010.2.18.49 – 10.2.18.5010.2.18.51
1410.2.18.52/3010.2.18.53 – 10.2.18.5410.2.18.55
1510.2.18.56/3010.2.18.57 – 10.2.18.5810.2.18.59
1610.2.18.60/3010.2.18.61 – 10.2.18.6210.2.18.63
1710.2.18.64/3010.2.18.65 – 10.2.18.6610.2.18.67
1810.2.18.68/3010.2.18.69 – 10.2.18.7010.2.18.71
1910.2.18.72/3010.2.18.73 – 10.2.18.7410.2.18.75
2010.2.18.76/3010.2.18.77 – 10.2.18.7810.2.18.79
2110.2.18.80/3010.2.18.81 – 10.2.18.8210.2.18.83
2210.2.18.84/3010.2.18.85 – 10.2.18.8610.2.18.87
2310.2.18.88/3010.2.18.89 – 10.2.18.9010.2.18.91
2410.2.18.92/3010.2.18.93 – 10.2.18.9410.2.18.95
2510.2.18.96/3010.2.18.97 – 10.2.18.9810.2.18.99
2610.2.18.100/3010.2.18.101 – 10.2.18.10210.2.18.103
2710.2.18.104/3010.2.18.105 – 10.2.18.10610.2.18.107
2810.2.18.108/3010.2.18.109 – 10.2.18.11010.2.18.111
2910.2.18.112/3010.2.18.113 – 10.2.18.11410.2.18.115
3010.2.18.116/3010.2.18.117 – 10.2.18.11810.2.18.119
3110.2.18.120/3010.2.18.121 – 10.2.18.12210.2.18.123
3210.2.18.124/3010.2.18.125 – 10.2.18.12610.2.18.127
3310.2.18.128/3010.2.18.129 – 10.2.18.13010.2.18.131
3410.2.18.132/3010.2.18.133 – 10.2.18.13410.2.18.135
3510.2.18.136/3010.2.18.137 – 10.2.18.13810.2.18.139
3610.2.18.140/3010.2.18.141 – 10.2.18.14210.2.18.143
3710.2.18.144/3010.2.18.145 – 10.2.18.14610.2.18.147
3810.2.18.148/3010.2.18.149 – 10.2.18.15010.2.18.151
3910.2.18.152/3010.2.18.153 – 10.2.18.15410.2.18.155
4010.2.18.156/3010.2.18.157 – 10.2.18.15810.2.18.159
4110.2.18.160/3010.2.18.161 – 10.2.18.16210.2.18.163
4210.2.18.164/3010.2.18.165 – 10.2.18.16610.2.18.167
4310.2.18.168/3010.2.18.169 – 10.2.18.17010.2.18.171
4410.2.18.172/3010.2.18.173 – 10.2.18.17410.2.18.175
4510.2.18.176/3010.2.18.177 – 10.2.18.17810.2.18.179
4610.2.18.180/3010.2.18.181 – 10.2.18.18210.2.18.183
4710.2.18.184/3010.2.18.185 – 10.2.18.18610.2.18.187
4810.2.18.188/3010.2.18.189 – 10.2.18.19010.2.18.191
4910.2.18.192/3010.2.18.193 – 10.2.18.19410.2.18.195
5010.2.18.196/3010.2.18.197 – 10.2.18.19810.2.18.199
5110.2.18.200/3010.2.18.201 – 10.2.18.20210.2.18.203
5210.2.18.204/3010.2.18.205 – 10.2.18.20610.2.18.207
5310.2.18.208/3010.2.18.209 – 10.2.18.21010.2.18.211
5410.2.18.212/3010.2.18.213 – 10.2.18.21410.2.18.215
5510.2.18.216/3010.2.18.217 – 10.2.18.21810.2.18.219
5610.2.18.220/3010.2.18.221 – 10.2.18.22210.2.18.223
5710.2.18.224/3010.2.18.225 – 10.2.18.22610.2.18.227
5810.2.18.228/3010.2.18.229 – 10.2.18.23010.2.18.231
5910.2.18.232/3010.2.18.233 – 10.2.18.23410.2.18.235
6010.2.18.236/3010.2.18.237 – 10.2.18.23810.2.18.239
6110.2.18.240/3010.2.18.241 – 10.2.18.24210.2.18.243
6210.2.18.244/3010.2.18.245 – 10.2.18.24610.2.18.247
6310.2.18.248/3010.2.18.249 – 10.2.18.25010.2.18.251
6410.2.18.252/3010.2.18.253 – 10.2.18.25410.2.18.255
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 →