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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)10.0.65.0/24
network10.0.65.0/24
broadcast10.0.65.255
first host10.0.65.1
last host10.0.65.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.65.0/24
address00001010.00000000.01000001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.01000001.00000000
broadcast00001010.00000000.01000001.11111111
green = network part, grey = host part
hex0x0a004100
decimal167788800
reverse dns0.65.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:4100

/24 split into /30 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.65.0/3010.0.65.1 – 10.0.65.210.0.65.3
210.0.65.4/3010.0.65.5 – 10.0.65.610.0.65.7
310.0.65.8/3010.0.65.9 – 10.0.65.1010.0.65.11
410.0.65.12/3010.0.65.13 – 10.0.65.1410.0.65.15
510.0.65.16/3010.0.65.17 – 10.0.65.1810.0.65.19
610.0.65.20/3010.0.65.21 – 10.0.65.2210.0.65.23
710.0.65.24/3010.0.65.25 – 10.0.65.2610.0.65.27
810.0.65.28/3010.0.65.29 – 10.0.65.3010.0.65.31
910.0.65.32/3010.0.65.33 – 10.0.65.3410.0.65.35
1010.0.65.36/3010.0.65.37 – 10.0.65.3810.0.65.39
1110.0.65.40/3010.0.65.41 – 10.0.65.4210.0.65.43
1210.0.65.44/3010.0.65.45 – 10.0.65.4610.0.65.47
1310.0.65.48/3010.0.65.49 – 10.0.65.5010.0.65.51
1410.0.65.52/3010.0.65.53 – 10.0.65.5410.0.65.55
1510.0.65.56/3010.0.65.57 – 10.0.65.5810.0.65.59
1610.0.65.60/3010.0.65.61 – 10.0.65.6210.0.65.63
1710.0.65.64/3010.0.65.65 – 10.0.65.6610.0.65.67
1810.0.65.68/3010.0.65.69 – 10.0.65.7010.0.65.71
1910.0.65.72/3010.0.65.73 – 10.0.65.7410.0.65.75
2010.0.65.76/3010.0.65.77 – 10.0.65.7810.0.65.79
2110.0.65.80/3010.0.65.81 – 10.0.65.8210.0.65.83
2210.0.65.84/3010.0.65.85 – 10.0.65.8610.0.65.87
2310.0.65.88/3010.0.65.89 – 10.0.65.9010.0.65.91
2410.0.65.92/3010.0.65.93 – 10.0.65.9410.0.65.95
2510.0.65.96/3010.0.65.97 – 10.0.65.9810.0.65.99
2610.0.65.100/3010.0.65.101 – 10.0.65.10210.0.65.103
2710.0.65.104/3010.0.65.105 – 10.0.65.10610.0.65.107
2810.0.65.108/3010.0.65.109 – 10.0.65.11010.0.65.111
2910.0.65.112/3010.0.65.113 – 10.0.65.11410.0.65.115
3010.0.65.116/3010.0.65.117 – 10.0.65.11810.0.65.119
3110.0.65.120/3010.0.65.121 – 10.0.65.12210.0.65.123
3210.0.65.124/3010.0.65.125 – 10.0.65.12610.0.65.127
3310.0.65.128/3010.0.65.129 – 10.0.65.13010.0.65.131
3410.0.65.132/3010.0.65.133 – 10.0.65.13410.0.65.135
3510.0.65.136/3010.0.65.137 – 10.0.65.13810.0.65.139
3610.0.65.140/3010.0.65.141 – 10.0.65.14210.0.65.143
3710.0.65.144/3010.0.65.145 – 10.0.65.14610.0.65.147
3810.0.65.148/3010.0.65.149 – 10.0.65.15010.0.65.151
3910.0.65.152/3010.0.65.153 – 10.0.65.15410.0.65.155
4010.0.65.156/3010.0.65.157 – 10.0.65.15810.0.65.159
4110.0.65.160/3010.0.65.161 – 10.0.65.16210.0.65.163
4210.0.65.164/3010.0.65.165 – 10.0.65.16610.0.65.167
4310.0.65.168/3010.0.65.169 – 10.0.65.17010.0.65.171
4410.0.65.172/3010.0.65.173 – 10.0.65.17410.0.65.175
4510.0.65.176/3010.0.65.177 – 10.0.65.17810.0.65.179
4610.0.65.180/3010.0.65.181 – 10.0.65.18210.0.65.183
4710.0.65.184/3010.0.65.185 – 10.0.65.18610.0.65.187
4810.0.65.188/3010.0.65.189 – 10.0.65.19010.0.65.191
4910.0.65.192/3010.0.65.193 – 10.0.65.19410.0.65.195
5010.0.65.196/3010.0.65.197 – 10.0.65.19810.0.65.199
5110.0.65.200/3010.0.65.201 – 10.0.65.20210.0.65.203
5210.0.65.204/3010.0.65.205 – 10.0.65.20610.0.65.207
5310.0.65.208/3010.0.65.209 – 10.0.65.21010.0.65.211
5410.0.65.212/3010.0.65.213 – 10.0.65.21410.0.65.215
5510.0.65.216/3010.0.65.217 – 10.0.65.21810.0.65.219
5610.0.65.220/3010.0.65.221 – 10.0.65.22210.0.65.223
5710.0.65.224/3010.0.65.225 – 10.0.65.22610.0.65.227
5810.0.65.228/3010.0.65.229 – 10.0.65.23010.0.65.231
5910.0.65.232/3010.0.65.233 – 10.0.65.23410.0.65.235
6010.0.65.236/3010.0.65.237 – 10.0.65.23810.0.65.239
6110.0.65.240/3010.0.65.241 – 10.0.65.24210.0.65.243
6210.0.65.244/3010.0.65.245 – 10.0.65.24610.0.65.247
6310.0.65.248/3010.0.65.249 – 10.0.65.25010.0.65.251
6410.0.65.252/3010.0.65.253 – 10.0.65.25410.0.65.255
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 →