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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)10.2.51.0/24
network10.2.51.0/24
broadcast10.2.51.255
first host10.2.51.1
last host10.2.51.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.51.0/24
address00001010.00000010.00110011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00110011.00000000
broadcast00001010.00000010.00110011.11111111
green = network part, grey = host part
hex0x0a023300
decimal167916288
reverse dns0.51.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3300

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.51.0/3010.2.51.1 – 10.2.51.210.2.51.3
210.2.51.4/3010.2.51.5 – 10.2.51.610.2.51.7
310.2.51.8/3010.2.51.9 – 10.2.51.1010.2.51.11
410.2.51.12/3010.2.51.13 – 10.2.51.1410.2.51.15
510.2.51.16/3010.2.51.17 – 10.2.51.1810.2.51.19
610.2.51.20/3010.2.51.21 – 10.2.51.2210.2.51.23
710.2.51.24/3010.2.51.25 – 10.2.51.2610.2.51.27
810.2.51.28/3010.2.51.29 – 10.2.51.3010.2.51.31
910.2.51.32/3010.2.51.33 – 10.2.51.3410.2.51.35
1010.2.51.36/3010.2.51.37 – 10.2.51.3810.2.51.39
1110.2.51.40/3010.2.51.41 – 10.2.51.4210.2.51.43
1210.2.51.44/3010.2.51.45 – 10.2.51.4610.2.51.47
1310.2.51.48/3010.2.51.49 – 10.2.51.5010.2.51.51
1410.2.51.52/3010.2.51.53 – 10.2.51.5410.2.51.55
1510.2.51.56/3010.2.51.57 – 10.2.51.5810.2.51.59
1610.2.51.60/3010.2.51.61 – 10.2.51.6210.2.51.63
1710.2.51.64/3010.2.51.65 – 10.2.51.6610.2.51.67
1810.2.51.68/3010.2.51.69 – 10.2.51.7010.2.51.71
1910.2.51.72/3010.2.51.73 – 10.2.51.7410.2.51.75
2010.2.51.76/3010.2.51.77 – 10.2.51.7810.2.51.79
2110.2.51.80/3010.2.51.81 – 10.2.51.8210.2.51.83
2210.2.51.84/3010.2.51.85 – 10.2.51.8610.2.51.87
2310.2.51.88/3010.2.51.89 – 10.2.51.9010.2.51.91
2410.2.51.92/3010.2.51.93 – 10.2.51.9410.2.51.95
2510.2.51.96/3010.2.51.97 – 10.2.51.9810.2.51.99
2610.2.51.100/3010.2.51.101 – 10.2.51.10210.2.51.103
2710.2.51.104/3010.2.51.105 – 10.2.51.10610.2.51.107
2810.2.51.108/3010.2.51.109 – 10.2.51.11010.2.51.111
2910.2.51.112/3010.2.51.113 – 10.2.51.11410.2.51.115
3010.2.51.116/3010.2.51.117 – 10.2.51.11810.2.51.119
3110.2.51.120/3010.2.51.121 – 10.2.51.12210.2.51.123
3210.2.51.124/3010.2.51.125 – 10.2.51.12610.2.51.127
3310.2.51.128/3010.2.51.129 – 10.2.51.13010.2.51.131
3410.2.51.132/3010.2.51.133 – 10.2.51.13410.2.51.135
3510.2.51.136/3010.2.51.137 – 10.2.51.13810.2.51.139
3610.2.51.140/3010.2.51.141 – 10.2.51.14210.2.51.143
3710.2.51.144/3010.2.51.145 – 10.2.51.14610.2.51.147
3810.2.51.148/3010.2.51.149 – 10.2.51.15010.2.51.151
3910.2.51.152/3010.2.51.153 – 10.2.51.15410.2.51.155
4010.2.51.156/3010.2.51.157 – 10.2.51.15810.2.51.159
4110.2.51.160/3010.2.51.161 – 10.2.51.16210.2.51.163
4210.2.51.164/3010.2.51.165 – 10.2.51.16610.2.51.167
4310.2.51.168/3010.2.51.169 – 10.2.51.17010.2.51.171
4410.2.51.172/3010.2.51.173 – 10.2.51.17410.2.51.175
4510.2.51.176/3010.2.51.177 – 10.2.51.17810.2.51.179
4610.2.51.180/3010.2.51.181 – 10.2.51.18210.2.51.183
4710.2.51.184/3010.2.51.185 – 10.2.51.18610.2.51.187
4810.2.51.188/3010.2.51.189 – 10.2.51.19010.2.51.191
4910.2.51.192/3010.2.51.193 – 10.2.51.19410.2.51.195
5010.2.51.196/3010.2.51.197 – 10.2.51.19810.2.51.199
5110.2.51.200/3010.2.51.201 – 10.2.51.20210.2.51.203
5210.2.51.204/3010.2.51.205 – 10.2.51.20610.2.51.207
5310.2.51.208/3010.2.51.209 – 10.2.51.21010.2.51.211
5410.2.51.212/3010.2.51.213 – 10.2.51.21410.2.51.215
5510.2.51.216/3010.2.51.217 – 10.2.51.21810.2.51.219
5610.2.51.220/3010.2.51.221 – 10.2.51.22210.2.51.223
5710.2.51.224/3010.2.51.225 – 10.2.51.22610.2.51.227
5810.2.51.228/3010.2.51.229 – 10.2.51.23010.2.51.231
5910.2.51.232/3010.2.51.233 – 10.2.51.23410.2.51.235
6010.2.51.236/3010.2.51.237 – 10.2.51.23810.2.51.239
6110.2.51.240/3010.2.51.241 – 10.2.51.24210.2.51.243
6210.2.51.244/3010.2.51.245 – 10.2.51.24610.2.51.247
6310.2.51.248/3010.2.51.249 – 10.2.51.25010.2.51.251
6410.2.51.252/3010.2.51.253 – 10.2.51.25410.2.51.255
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 →