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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)192.168.1.64/26
network192.168.1.64/26
broadcast192.168.1.127
first host192.168.1.65
last host192.168.1.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classC
ipcalc 192.168.1.64/26
address11000000.10101000.00000001.01000000
subnet mask11111111.11111111.11111111.11000000
network11000000.10101000.00000001.01000000
broadcast11000000.10101000.00000001.01111111
green = network part, grey = host part
hex0xc0a80140
decimal3232235840
reverse dns64.1.168.192.in-addr.arpa
ipv4-mapped::ffff:c0a8:140

/26 split into /30 · 16 subnets

close ×
#networkhost rangebroadcast
1192.168.1.64/30192.168.1.65 – 192.168.1.66192.168.1.67
2192.168.1.68/30192.168.1.69 – 192.168.1.70192.168.1.71
3192.168.1.72/30192.168.1.73 – 192.168.1.74192.168.1.75
4192.168.1.76/30192.168.1.77 – 192.168.1.78192.168.1.79
5192.168.1.80/30192.168.1.81 – 192.168.1.82192.168.1.83
6192.168.1.84/30192.168.1.85 – 192.168.1.86192.168.1.87
7192.168.1.88/30192.168.1.89 – 192.168.1.90192.168.1.91
8192.168.1.92/30192.168.1.93 – 192.168.1.94192.168.1.95
9192.168.1.96/30192.168.1.97 – 192.168.1.98192.168.1.99
10192.168.1.100/30192.168.1.101 – 192.168.1.102192.168.1.103
11192.168.1.104/30192.168.1.105 – 192.168.1.106192.168.1.107
12192.168.1.108/30192.168.1.109 – 192.168.1.110192.168.1.111
13192.168.1.112/30192.168.1.113 – 192.168.1.114192.168.1.115
14192.168.1.116/30192.168.1.117 – 192.168.1.118192.168.1.119
15192.168.1.120/30192.168.1.121 – 192.168.1.122192.168.1.123
16192.168.1.124/30192.168.1.125 – 192.168.1.126192.168.1.127
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/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-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →