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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)10.3.32.0/20
network10.3.32.0/20
broadcast10.3.47.255
first host10.3.32.1
last host10.3.47.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.3.32.0/20
address00001010.00000011.00100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000011.00100000.00000000
broadcast00001010.00000011.00101111.11111111
green = network part, grey = host part
hex0x0a032000
decimal167976960
reverse dns0.32.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:2000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.32.0/2610.3.32.1 – 10.3.32.6210.3.32.63
210.3.32.64/2610.3.32.65 – 10.3.32.12610.3.32.127
310.3.32.128/2610.3.32.129 – 10.3.32.19010.3.32.191
410.3.32.192/2610.3.32.193 – 10.3.32.25410.3.32.255
510.3.33.0/2610.3.33.1 – 10.3.33.6210.3.33.63
610.3.33.64/2610.3.33.65 – 10.3.33.12610.3.33.127
710.3.33.128/2610.3.33.129 – 10.3.33.19010.3.33.191
810.3.33.192/2610.3.33.193 – 10.3.33.25410.3.33.255
910.3.34.0/2610.3.34.1 – 10.3.34.6210.3.34.63
1010.3.34.64/2610.3.34.65 – 10.3.34.12610.3.34.127
1110.3.34.128/2610.3.34.129 – 10.3.34.19010.3.34.191
1210.3.34.192/2610.3.34.193 – 10.3.34.25410.3.34.255
1310.3.35.0/2610.3.35.1 – 10.3.35.6210.3.35.63
1410.3.35.64/2610.3.35.65 – 10.3.35.12610.3.35.127
1510.3.35.128/2610.3.35.129 – 10.3.35.19010.3.35.191
1610.3.35.192/2610.3.35.193 – 10.3.35.25410.3.35.255
1710.3.36.0/2610.3.36.1 – 10.3.36.6210.3.36.63
1810.3.36.64/2610.3.36.65 – 10.3.36.12610.3.36.127
1910.3.36.128/2610.3.36.129 – 10.3.36.19010.3.36.191
2010.3.36.192/2610.3.36.193 – 10.3.36.25410.3.36.255
2110.3.37.0/2610.3.37.1 – 10.3.37.6210.3.37.63
2210.3.37.64/2610.3.37.65 – 10.3.37.12610.3.37.127
2310.3.37.128/2610.3.37.129 – 10.3.37.19010.3.37.191
2410.3.37.192/2610.3.37.193 – 10.3.37.25410.3.37.255
2510.3.38.0/2610.3.38.1 – 10.3.38.6210.3.38.63
2610.3.38.64/2610.3.38.65 – 10.3.38.12610.3.38.127
2710.3.38.128/2610.3.38.129 – 10.3.38.19010.3.38.191
2810.3.38.192/2610.3.38.193 – 10.3.38.25410.3.38.255
2910.3.39.0/2610.3.39.1 – 10.3.39.6210.3.39.63
3010.3.39.64/2610.3.39.65 – 10.3.39.12610.3.39.127
3110.3.39.128/2610.3.39.129 – 10.3.39.19010.3.39.191
3210.3.39.192/2610.3.39.193 – 10.3.39.25410.3.39.255
3310.3.40.0/2610.3.40.1 – 10.3.40.6210.3.40.63
3410.3.40.64/2610.3.40.65 – 10.3.40.12610.3.40.127
3510.3.40.128/2610.3.40.129 – 10.3.40.19010.3.40.191
3610.3.40.192/2610.3.40.193 – 10.3.40.25410.3.40.255
3710.3.41.0/2610.3.41.1 – 10.3.41.6210.3.41.63
3810.3.41.64/2610.3.41.65 – 10.3.41.12610.3.41.127
3910.3.41.128/2610.3.41.129 – 10.3.41.19010.3.41.191
4010.3.41.192/2610.3.41.193 – 10.3.41.25410.3.41.255
4110.3.42.0/2610.3.42.1 – 10.3.42.6210.3.42.63
4210.3.42.64/2610.3.42.65 – 10.3.42.12610.3.42.127
4310.3.42.128/2610.3.42.129 – 10.3.42.19010.3.42.191
4410.3.42.192/2610.3.42.193 – 10.3.42.25410.3.42.255
4510.3.43.0/2610.3.43.1 – 10.3.43.6210.3.43.63
4610.3.43.64/2610.3.43.65 – 10.3.43.12610.3.43.127
4710.3.43.128/2610.3.43.129 – 10.3.43.19010.3.43.191
4810.3.43.192/2610.3.43.193 – 10.3.43.25410.3.43.255
4910.3.44.0/2610.3.44.1 – 10.3.44.6210.3.44.63
5010.3.44.64/2610.3.44.65 – 10.3.44.12610.3.44.127
5110.3.44.128/2610.3.44.129 – 10.3.44.19010.3.44.191
5210.3.44.192/2610.3.44.193 – 10.3.44.25410.3.44.255
5310.3.45.0/2610.3.45.1 – 10.3.45.6210.3.45.63
5410.3.45.64/2610.3.45.65 – 10.3.45.12610.3.45.127
5510.3.45.128/2610.3.45.129 – 10.3.45.19010.3.45.191
5610.3.45.192/2610.3.45.193 – 10.3.45.25410.3.45.255
5710.3.46.0/2610.3.46.1 – 10.3.46.6210.3.46.63
5810.3.46.64/2610.3.46.65 – 10.3.46.12610.3.46.127
5910.3.46.128/2610.3.46.129 – 10.3.46.19010.3.46.191
6010.3.46.192/2610.3.46.193 – 10.3.46.25410.3.46.255
6110.3.47.0/2610.3.47.1 – 10.3.47.6210.3.47.63
6210.3.47.64/2610.3.47.65 – 10.3.47.12610.3.47.127
6310.3.47.128/2610.3.47.129 – 10.3.47.19010.3.47.191
6410.3.47.192/2610.3.47.193 – 10.3.47.25410.3.47.255
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 →