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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)10.16.224.0/19
network10.16.224.0/19
broadcast10.16.255.255
first host10.16.224.1
last host10.16.255.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.16.224.0/19
address00001010.00010000.11100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010000.11100000.00000000
broadcast00001010.00010000.11111111.11111111
green = network part, grey = host part
hex0x0a10e000
decimal168878080
reverse dns0.224.16.10.in-addr.arpa
ipv4-mapped::ffff:a10:e000

/19 split into /23 · 16 subnets

close ×
#networkhost rangebroadcast
110.16.224.0/2310.16.224.1 – 10.16.225.25410.16.225.255
210.16.226.0/2310.16.226.1 – 10.16.227.25410.16.227.255
310.16.228.0/2310.16.228.1 – 10.16.229.25410.16.229.255
410.16.230.0/2310.16.230.1 – 10.16.231.25410.16.231.255
510.16.232.0/2310.16.232.1 – 10.16.233.25410.16.233.255
610.16.234.0/2310.16.234.1 – 10.16.235.25410.16.235.255
710.16.236.0/2310.16.236.1 – 10.16.237.25410.16.237.255
810.16.238.0/2310.16.238.1 – 10.16.239.25410.16.239.255
910.16.240.0/2310.16.240.1 – 10.16.241.25410.16.241.255
1010.16.242.0/2310.16.242.1 – 10.16.243.25410.16.243.255
1110.16.244.0/2310.16.244.1 – 10.16.245.25410.16.245.255
1210.16.246.0/2310.16.246.1 – 10.16.247.25410.16.247.255
1310.16.248.0/2310.16.248.1 – 10.16.249.25410.16.249.255
1410.16.250.0/2310.16.250.1 – 10.16.251.25410.16.251.255
1510.16.252.0/2310.16.252.1 – 10.16.253.25410.16.253.255
1610.16.254.0/2310.16.254.1 – 10.16.255.25410.16.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /19
/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-
/19255.255.224.08,1928,1901
/20255.255.240.04,0964,0942 split →
/21255.255.248.02,0482,0464 split →
/22255.255.252.01,0241,0228 split →
/23255.255.254.051251016 split →
/24255.255.255.025625432 split →
/25255.255.255.12812812664 split →
/26255.255.255.1926462128 split →
/27255.255.255.2243230256 split →
/28255.255.255.2401614512 split →
/29255.255.255.248861,024 split →
/30255.255.255.252422,048 split →
/31255.255.255.254224,096 split →
/32255.255.255.255118,192 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 →