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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)10.78.48.0/20
network10.78.48.0/20
broadcast10.78.63.255
first host10.78.48.1
last host10.78.63.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.78.48.0/20
address00001010.01001110.00110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.01001110.00110000.00000000
broadcast00001010.01001110.00111111.11111111
green = network part, grey = host part
hex0x0a4e3000
decimal172896256
reverse dns0.48.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:3000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.78.48.0/2610.78.48.1 – 10.78.48.6210.78.48.63
210.78.48.64/2610.78.48.65 – 10.78.48.12610.78.48.127
310.78.48.128/2610.78.48.129 – 10.78.48.19010.78.48.191
410.78.48.192/2610.78.48.193 – 10.78.48.25410.78.48.255
510.78.49.0/2610.78.49.1 – 10.78.49.6210.78.49.63
610.78.49.64/2610.78.49.65 – 10.78.49.12610.78.49.127
710.78.49.128/2610.78.49.129 – 10.78.49.19010.78.49.191
810.78.49.192/2610.78.49.193 – 10.78.49.25410.78.49.255
910.78.50.0/2610.78.50.1 – 10.78.50.6210.78.50.63
1010.78.50.64/2610.78.50.65 – 10.78.50.12610.78.50.127
1110.78.50.128/2610.78.50.129 – 10.78.50.19010.78.50.191
1210.78.50.192/2610.78.50.193 – 10.78.50.25410.78.50.255
1310.78.51.0/2610.78.51.1 – 10.78.51.6210.78.51.63
1410.78.51.64/2610.78.51.65 – 10.78.51.12610.78.51.127
1510.78.51.128/2610.78.51.129 – 10.78.51.19010.78.51.191
1610.78.51.192/2610.78.51.193 – 10.78.51.25410.78.51.255
1710.78.52.0/2610.78.52.1 – 10.78.52.6210.78.52.63
1810.78.52.64/2610.78.52.65 – 10.78.52.12610.78.52.127
1910.78.52.128/2610.78.52.129 – 10.78.52.19010.78.52.191
2010.78.52.192/2610.78.52.193 – 10.78.52.25410.78.52.255
2110.78.53.0/2610.78.53.1 – 10.78.53.6210.78.53.63
2210.78.53.64/2610.78.53.65 – 10.78.53.12610.78.53.127
2310.78.53.128/2610.78.53.129 – 10.78.53.19010.78.53.191
2410.78.53.192/2610.78.53.193 – 10.78.53.25410.78.53.255
2510.78.54.0/2610.78.54.1 – 10.78.54.6210.78.54.63
2610.78.54.64/2610.78.54.65 – 10.78.54.12610.78.54.127
2710.78.54.128/2610.78.54.129 – 10.78.54.19010.78.54.191
2810.78.54.192/2610.78.54.193 – 10.78.54.25410.78.54.255
2910.78.55.0/2610.78.55.1 – 10.78.55.6210.78.55.63
3010.78.55.64/2610.78.55.65 – 10.78.55.12610.78.55.127
3110.78.55.128/2610.78.55.129 – 10.78.55.19010.78.55.191
3210.78.55.192/2610.78.55.193 – 10.78.55.25410.78.55.255
3310.78.56.0/2610.78.56.1 – 10.78.56.6210.78.56.63
3410.78.56.64/2610.78.56.65 – 10.78.56.12610.78.56.127
3510.78.56.128/2610.78.56.129 – 10.78.56.19010.78.56.191
3610.78.56.192/2610.78.56.193 – 10.78.56.25410.78.56.255
3710.78.57.0/2610.78.57.1 – 10.78.57.6210.78.57.63
3810.78.57.64/2610.78.57.65 – 10.78.57.12610.78.57.127
3910.78.57.128/2610.78.57.129 – 10.78.57.19010.78.57.191
4010.78.57.192/2610.78.57.193 – 10.78.57.25410.78.57.255
4110.78.58.0/2610.78.58.1 – 10.78.58.6210.78.58.63
4210.78.58.64/2610.78.58.65 – 10.78.58.12610.78.58.127
4310.78.58.128/2610.78.58.129 – 10.78.58.19010.78.58.191
4410.78.58.192/2610.78.58.193 – 10.78.58.25410.78.58.255
4510.78.59.0/2610.78.59.1 – 10.78.59.6210.78.59.63
4610.78.59.64/2610.78.59.65 – 10.78.59.12610.78.59.127
4710.78.59.128/2610.78.59.129 – 10.78.59.19010.78.59.191
4810.78.59.192/2610.78.59.193 – 10.78.59.25410.78.59.255
4910.78.60.0/2610.78.60.1 – 10.78.60.6210.78.60.63
5010.78.60.64/2610.78.60.65 – 10.78.60.12610.78.60.127
5110.78.60.128/2610.78.60.129 – 10.78.60.19010.78.60.191
5210.78.60.192/2610.78.60.193 – 10.78.60.25410.78.60.255
5310.78.61.0/2610.78.61.1 – 10.78.61.6210.78.61.63
5410.78.61.64/2610.78.61.65 – 10.78.61.12610.78.61.127
5510.78.61.128/2610.78.61.129 – 10.78.61.19010.78.61.191
5610.78.61.192/2610.78.61.193 – 10.78.61.25410.78.61.255
5710.78.62.0/2610.78.62.1 – 10.78.62.6210.78.62.63
5810.78.62.64/2610.78.62.65 – 10.78.62.12610.78.62.127
5910.78.62.128/2610.78.62.129 – 10.78.62.19010.78.62.191
6010.78.62.192/2610.78.62.193 – 10.78.62.25410.78.62.255
6110.78.63.0/2610.78.63.1 – 10.78.63.6210.78.63.63
6210.78.63.64/2610.78.63.65 – 10.78.63.12610.78.63.127
6310.78.63.128/2610.78.63.129 – 10.78.63.19010.78.63.191
6410.78.63.192/2610.78.63.193 – 10.78.63.25410.78.63.255
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 →