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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)10.12.48.0/20
network10.12.48.0/20
broadcast10.12.63.255
first host10.12.48.1
last host10.12.63.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.12.48.0/20
address00001010.00001100.00110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00001100.00110000.00000000
broadcast00001010.00001100.00111111.11111111
green = network part, grey = host part
hex0x0a0c3000
decimal168570880
reverse dns0.48.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:3000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.48.0/2610.12.48.1 – 10.12.48.6210.12.48.63
210.12.48.64/2610.12.48.65 – 10.12.48.12610.12.48.127
310.12.48.128/2610.12.48.129 – 10.12.48.19010.12.48.191
410.12.48.192/2610.12.48.193 – 10.12.48.25410.12.48.255
510.12.49.0/2610.12.49.1 – 10.12.49.6210.12.49.63
610.12.49.64/2610.12.49.65 – 10.12.49.12610.12.49.127
710.12.49.128/2610.12.49.129 – 10.12.49.19010.12.49.191
810.12.49.192/2610.12.49.193 – 10.12.49.25410.12.49.255
910.12.50.0/2610.12.50.1 – 10.12.50.6210.12.50.63
1010.12.50.64/2610.12.50.65 – 10.12.50.12610.12.50.127
1110.12.50.128/2610.12.50.129 – 10.12.50.19010.12.50.191
1210.12.50.192/2610.12.50.193 – 10.12.50.25410.12.50.255
1310.12.51.0/2610.12.51.1 – 10.12.51.6210.12.51.63
1410.12.51.64/2610.12.51.65 – 10.12.51.12610.12.51.127
1510.12.51.128/2610.12.51.129 – 10.12.51.19010.12.51.191
1610.12.51.192/2610.12.51.193 – 10.12.51.25410.12.51.255
1710.12.52.0/2610.12.52.1 – 10.12.52.6210.12.52.63
1810.12.52.64/2610.12.52.65 – 10.12.52.12610.12.52.127
1910.12.52.128/2610.12.52.129 – 10.12.52.19010.12.52.191
2010.12.52.192/2610.12.52.193 – 10.12.52.25410.12.52.255
2110.12.53.0/2610.12.53.1 – 10.12.53.6210.12.53.63
2210.12.53.64/2610.12.53.65 – 10.12.53.12610.12.53.127
2310.12.53.128/2610.12.53.129 – 10.12.53.19010.12.53.191
2410.12.53.192/2610.12.53.193 – 10.12.53.25410.12.53.255
2510.12.54.0/2610.12.54.1 – 10.12.54.6210.12.54.63
2610.12.54.64/2610.12.54.65 – 10.12.54.12610.12.54.127
2710.12.54.128/2610.12.54.129 – 10.12.54.19010.12.54.191
2810.12.54.192/2610.12.54.193 – 10.12.54.25410.12.54.255
2910.12.55.0/2610.12.55.1 – 10.12.55.6210.12.55.63
3010.12.55.64/2610.12.55.65 – 10.12.55.12610.12.55.127
3110.12.55.128/2610.12.55.129 – 10.12.55.19010.12.55.191
3210.12.55.192/2610.12.55.193 – 10.12.55.25410.12.55.255
3310.12.56.0/2610.12.56.1 – 10.12.56.6210.12.56.63
3410.12.56.64/2610.12.56.65 – 10.12.56.12610.12.56.127
3510.12.56.128/2610.12.56.129 – 10.12.56.19010.12.56.191
3610.12.56.192/2610.12.56.193 – 10.12.56.25410.12.56.255
3710.12.57.0/2610.12.57.1 – 10.12.57.6210.12.57.63
3810.12.57.64/2610.12.57.65 – 10.12.57.12610.12.57.127
3910.12.57.128/2610.12.57.129 – 10.12.57.19010.12.57.191
4010.12.57.192/2610.12.57.193 – 10.12.57.25410.12.57.255
4110.12.58.0/2610.12.58.1 – 10.12.58.6210.12.58.63
4210.12.58.64/2610.12.58.65 – 10.12.58.12610.12.58.127
4310.12.58.128/2610.12.58.129 – 10.12.58.19010.12.58.191
4410.12.58.192/2610.12.58.193 – 10.12.58.25410.12.58.255
4510.12.59.0/2610.12.59.1 – 10.12.59.6210.12.59.63
4610.12.59.64/2610.12.59.65 – 10.12.59.12610.12.59.127
4710.12.59.128/2610.12.59.129 – 10.12.59.19010.12.59.191
4810.12.59.192/2610.12.59.193 – 10.12.59.25410.12.59.255
4910.12.60.0/2610.12.60.1 – 10.12.60.6210.12.60.63
5010.12.60.64/2610.12.60.65 – 10.12.60.12610.12.60.127
5110.12.60.128/2610.12.60.129 – 10.12.60.19010.12.60.191
5210.12.60.192/2610.12.60.193 – 10.12.60.25410.12.60.255
5310.12.61.0/2610.12.61.1 – 10.12.61.6210.12.61.63
5410.12.61.64/2610.12.61.65 – 10.12.61.12610.12.61.127
5510.12.61.128/2610.12.61.129 – 10.12.61.19010.12.61.191
5610.12.61.192/2610.12.61.193 – 10.12.61.25410.12.61.255
5710.12.62.0/2610.12.62.1 – 10.12.62.6210.12.62.63
5810.12.62.64/2610.12.62.65 – 10.12.62.12610.12.62.127
5910.12.62.128/2610.12.62.129 – 10.12.62.19010.12.62.191
6010.12.62.192/2610.12.62.193 – 10.12.62.25410.12.62.255
6110.12.63.0/2610.12.63.1 – 10.12.63.6210.12.63.63
6210.12.63.64/2610.12.63.65 – 10.12.63.12610.12.63.127
6310.12.63.128/2610.12.63.129 – 10.12.63.19010.12.63.191
6410.12.63.192/2610.12.63.193 – 10.12.63.25410.12.63.255
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 →