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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)10.63.32.0/20
network10.63.32.0/20
broadcast10.63.47.255
first host10.63.32.1
last host10.63.47.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.63.32.0/20
address00001010.00111111.00100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00111111.00100000.00000000
broadcast00001010.00111111.00101111.11111111
green = network part, grey = host part
hex0x0a3f2000
decimal171909120
reverse dns0.32.63.10.in-addr.arpa
ipv4-mapped::ffff:a3f:2000

/20 split into /25 · 32 subnets

close ×
#networkhost rangebroadcast
110.63.32.0/2510.63.32.1 – 10.63.32.12610.63.32.127
210.63.32.128/2510.63.32.129 – 10.63.32.25410.63.32.255
310.63.33.0/2510.63.33.1 – 10.63.33.12610.63.33.127
410.63.33.128/2510.63.33.129 – 10.63.33.25410.63.33.255
510.63.34.0/2510.63.34.1 – 10.63.34.12610.63.34.127
610.63.34.128/2510.63.34.129 – 10.63.34.25410.63.34.255
710.63.35.0/2510.63.35.1 – 10.63.35.12610.63.35.127
810.63.35.128/2510.63.35.129 – 10.63.35.25410.63.35.255
910.63.36.0/2510.63.36.1 – 10.63.36.12610.63.36.127
1010.63.36.128/2510.63.36.129 – 10.63.36.25410.63.36.255
1110.63.37.0/2510.63.37.1 – 10.63.37.12610.63.37.127
1210.63.37.128/2510.63.37.129 – 10.63.37.25410.63.37.255
1310.63.38.0/2510.63.38.1 – 10.63.38.12610.63.38.127
1410.63.38.128/2510.63.38.129 – 10.63.38.25410.63.38.255
1510.63.39.0/2510.63.39.1 – 10.63.39.12610.63.39.127
1610.63.39.128/2510.63.39.129 – 10.63.39.25410.63.39.255
1710.63.40.0/2510.63.40.1 – 10.63.40.12610.63.40.127
1810.63.40.128/2510.63.40.129 – 10.63.40.25410.63.40.255
1910.63.41.0/2510.63.41.1 – 10.63.41.12610.63.41.127
2010.63.41.128/2510.63.41.129 – 10.63.41.25410.63.41.255
2110.63.42.0/2510.63.42.1 – 10.63.42.12610.63.42.127
2210.63.42.128/2510.63.42.129 – 10.63.42.25410.63.42.255
2310.63.43.0/2510.63.43.1 – 10.63.43.12610.63.43.127
2410.63.43.128/2510.63.43.129 – 10.63.43.25410.63.43.255
2510.63.44.0/2510.63.44.1 – 10.63.44.12610.63.44.127
2610.63.44.128/2510.63.44.129 – 10.63.44.25410.63.44.255
2710.63.45.0/2510.63.45.1 – 10.63.45.12610.63.45.127
2810.63.45.128/2510.63.45.129 – 10.63.45.25410.63.45.255
2910.63.46.0/2510.63.46.1 – 10.63.46.12610.63.46.127
3010.63.46.128/2510.63.46.129 – 10.63.46.25410.63.46.255
3110.63.47.0/2510.63.47.1 – 10.63.47.12610.63.47.127
3210.63.47.128/2510.63.47.129 – 10.63.47.25410.63.47.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /20
/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-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 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 →