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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)10.28.224.0/19
network10.28.224.0/19
broadcast10.28.255.255
first host10.28.224.1
last host10.28.255.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.28.224.0/19
address00001010.00011100.11100000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00011100.11100000.00000000
broadcast00001010.00011100.11111111.11111111
green = network part, grey = host part
hex0x0a1ce000
decimal169664512
reverse dns0.224.28.10.in-addr.arpa
ipv4-mapped::ffff:a1c:e000

/19 split into /24 · 32 subnets

close ×
#networkhost rangebroadcast
110.28.224.0/2410.28.224.1 – 10.28.224.25410.28.224.255
210.28.225.0/2410.28.225.1 – 10.28.225.25410.28.225.255
310.28.226.0/2410.28.226.1 – 10.28.226.25410.28.226.255
410.28.227.0/2410.28.227.1 – 10.28.227.25410.28.227.255
510.28.228.0/2410.28.228.1 – 10.28.228.25410.28.228.255
610.28.229.0/2410.28.229.1 – 10.28.229.25410.28.229.255
710.28.230.0/2410.28.230.1 – 10.28.230.25410.28.230.255
810.28.231.0/2410.28.231.1 – 10.28.231.25410.28.231.255
910.28.232.0/2410.28.232.1 – 10.28.232.25410.28.232.255
1010.28.233.0/2410.28.233.1 – 10.28.233.25410.28.233.255
1110.28.234.0/2410.28.234.1 – 10.28.234.25410.28.234.255
1210.28.235.0/2410.28.235.1 – 10.28.235.25410.28.235.255
1310.28.236.0/2410.28.236.1 – 10.28.236.25410.28.236.255
1410.28.237.0/2410.28.237.1 – 10.28.237.25410.28.237.255
1510.28.238.0/2410.28.238.1 – 10.28.238.25410.28.238.255
1610.28.239.0/2410.28.239.1 – 10.28.239.25410.28.239.255
1710.28.240.0/2410.28.240.1 – 10.28.240.25410.28.240.255
1810.28.241.0/2410.28.241.1 – 10.28.241.25410.28.241.255
1910.28.242.0/2410.28.242.1 – 10.28.242.25410.28.242.255
2010.28.243.0/2410.28.243.1 – 10.28.243.25410.28.243.255
2110.28.244.0/2410.28.244.1 – 10.28.244.25410.28.244.255
2210.28.245.0/2410.28.245.1 – 10.28.245.25410.28.245.255
2310.28.246.0/2410.28.246.1 – 10.28.246.25410.28.246.255
2410.28.247.0/2410.28.247.1 – 10.28.247.25410.28.247.255
2510.28.248.0/2410.28.248.1 – 10.28.248.25410.28.248.255
2610.28.249.0/2410.28.249.1 – 10.28.249.25410.28.249.255
2710.28.250.0/2410.28.250.1 – 10.28.250.25410.28.250.255
2810.28.251.0/2410.28.251.1 – 10.28.251.25410.28.251.255
2910.28.252.0/2410.28.252.1 – 10.28.252.25410.28.252.255
3010.28.253.0/2410.28.253.1 – 10.28.253.25410.28.253.255
3110.28.254.0/2410.28.254.1 – 10.28.254.25410.28.254.255
3210.28.255.0/2410.28.255.1 – 10.28.255.25410.28.255.255
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 →