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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)10.3.20.0/26
network10.3.20.0/26
broadcast10.3.20.63
first host10.3.20.1
last host10.3.20.62
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.20.0/26
address00001010.00000011.00010100.00000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.00010100.00000000
broadcast00001010.00000011.00010100.00111111
green = network part, grey = host part
hex0x0a031400
decimal167973888
reverse dns0.20.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:1400

/26 split into /30 · 16 subnets

close ×
#networkhost rangebroadcast
110.3.20.0/3010.3.20.1 – 10.3.20.210.3.20.3
210.3.20.4/3010.3.20.5 – 10.3.20.610.3.20.7
310.3.20.8/3010.3.20.9 – 10.3.20.1010.3.20.11
410.3.20.12/3010.3.20.13 – 10.3.20.1410.3.20.15
510.3.20.16/3010.3.20.17 – 10.3.20.1810.3.20.19
610.3.20.20/3010.3.20.21 – 10.3.20.2210.3.20.23
710.3.20.24/3010.3.20.25 – 10.3.20.2610.3.20.27
810.3.20.28/3010.3.20.29 – 10.3.20.3010.3.20.31
910.3.20.32/3010.3.20.33 – 10.3.20.3410.3.20.35
1010.3.20.36/3010.3.20.37 – 10.3.20.3810.3.20.39
1110.3.20.40/3010.3.20.41 – 10.3.20.4210.3.20.43
1210.3.20.44/3010.3.20.45 – 10.3.20.4610.3.20.47
1310.3.20.48/3010.3.20.49 – 10.3.20.5010.3.20.51
1410.3.20.52/3010.3.20.53 – 10.3.20.5410.3.20.55
1510.3.20.56/3010.3.20.57 – 10.3.20.5810.3.20.59
1610.3.20.60/3010.3.20.61 – 10.3.20.6210.3.20.63
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 →