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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)10.17.32.0/19
network10.17.32.0/19
broadcast10.17.63.255
first host10.17.32.1
last host10.17.63.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.17.32.0/19
address00001010.00010001.00100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010001.00100000.00000000
broadcast00001010.00010001.00111111.11111111
green = network part, grey = host part
hex0x0a112000
decimal168894464
reverse dns0.32.17.10.in-addr.arpa
ipv4-mapped::ffff:a11:2000

/19 split into /24 · 32 subnets

close ×
#networkhost rangebroadcast
110.17.32.0/2410.17.32.1 – 10.17.32.25410.17.32.255
210.17.33.0/2410.17.33.1 – 10.17.33.25410.17.33.255
310.17.34.0/2410.17.34.1 – 10.17.34.25410.17.34.255
410.17.35.0/2410.17.35.1 – 10.17.35.25410.17.35.255
510.17.36.0/2410.17.36.1 – 10.17.36.25410.17.36.255
610.17.37.0/2410.17.37.1 – 10.17.37.25410.17.37.255
710.17.38.0/2410.17.38.1 – 10.17.38.25410.17.38.255
810.17.39.0/2410.17.39.1 – 10.17.39.25410.17.39.255
910.17.40.0/2410.17.40.1 – 10.17.40.25410.17.40.255
1010.17.41.0/2410.17.41.1 – 10.17.41.25410.17.41.255
1110.17.42.0/2410.17.42.1 – 10.17.42.25410.17.42.255
1210.17.43.0/2410.17.43.1 – 10.17.43.25410.17.43.255
1310.17.44.0/2410.17.44.1 – 10.17.44.25410.17.44.255
1410.17.45.0/2410.17.45.1 – 10.17.45.25410.17.45.255
1510.17.46.0/2410.17.46.1 – 10.17.46.25410.17.46.255
1610.17.47.0/2410.17.47.1 – 10.17.47.25410.17.47.255
1710.17.48.0/2410.17.48.1 – 10.17.48.25410.17.48.255
1810.17.49.0/2410.17.49.1 – 10.17.49.25410.17.49.255
1910.17.50.0/2410.17.50.1 – 10.17.50.25410.17.50.255
2010.17.51.0/2410.17.51.1 – 10.17.51.25410.17.51.255
2110.17.52.0/2410.17.52.1 – 10.17.52.25410.17.52.255
2210.17.53.0/2410.17.53.1 – 10.17.53.25410.17.53.255
2310.17.54.0/2410.17.54.1 – 10.17.54.25410.17.54.255
2410.17.55.0/2410.17.55.1 – 10.17.55.25410.17.55.255
2510.17.56.0/2410.17.56.1 – 10.17.56.25410.17.56.255
2610.17.57.0/2410.17.57.1 – 10.17.57.25410.17.57.255
2710.17.58.0/2410.17.58.1 – 10.17.58.25410.17.58.255
2810.17.59.0/2410.17.59.1 – 10.17.59.25410.17.59.255
2910.17.60.0/2410.17.60.1 – 10.17.60.25410.17.60.255
3010.17.61.0/2410.17.61.1 – 10.17.61.25410.17.61.255
3110.17.62.0/2410.17.62.1 – 10.17.62.25410.17.62.255
3210.17.63.0/2410.17.63.1 – 10.17.63.25410.17.63.255
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 →