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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)10.187.48.0/20
network10.187.48.0/20
broadcast10.187.63.255
first host10.187.48.1
last host10.187.63.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.187.48.0/20
address00001010.10111011.00110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.10111011.00110000.00000000
broadcast00001010.10111011.00111111.11111111
green = network part, grey = host part
hex0x0abb3000
decimal180039680
reverse dns0.48.187.10.in-addr.arpa
ipv4-mapped::ffff:abb:3000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.187.48.0/2610.187.48.1 – 10.187.48.6210.187.48.63
210.187.48.64/2610.187.48.65 – 10.187.48.12610.187.48.127
310.187.48.128/2610.187.48.129 – 10.187.48.19010.187.48.191
410.187.48.192/2610.187.48.193 – 10.187.48.25410.187.48.255
510.187.49.0/2610.187.49.1 – 10.187.49.6210.187.49.63
610.187.49.64/2610.187.49.65 – 10.187.49.12610.187.49.127
710.187.49.128/2610.187.49.129 – 10.187.49.19010.187.49.191
810.187.49.192/2610.187.49.193 – 10.187.49.25410.187.49.255
910.187.50.0/2610.187.50.1 – 10.187.50.6210.187.50.63
1010.187.50.64/2610.187.50.65 – 10.187.50.12610.187.50.127
1110.187.50.128/2610.187.50.129 – 10.187.50.19010.187.50.191
1210.187.50.192/2610.187.50.193 – 10.187.50.25410.187.50.255
1310.187.51.0/2610.187.51.1 – 10.187.51.6210.187.51.63
1410.187.51.64/2610.187.51.65 – 10.187.51.12610.187.51.127
1510.187.51.128/2610.187.51.129 – 10.187.51.19010.187.51.191
1610.187.51.192/2610.187.51.193 – 10.187.51.25410.187.51.255
1710.187.52.0/2610.187.52.1 – 10.187.52.6210.187.52.63
1810.187.52.64/2610.187.52.65 – 10.187.52.12610.187.52.127
1910.187.52.128/2610.187.52.129 – 10.187.52.19010.187.52.191
2010.187.52.192/2610.187.52.193 – 10.187.52.25410.187.52.255
2110.187.53.0/2610.187.53.1 – 10.187.53.6210.187.53.63
2210.187.53.64/2610.187.53.65 – 10.187.53.12610.187.53.127
2310.187.53.128/2610.187.53.129 – 10.187.53.19010.187.53.191
2410.187.53.192/2610.187.53.193 – 10.187.53.25410.187.53.255
2510.187.54.0/2610.187.54.1 – 10.187.54.6210.187.54.63
2610.187.54.64/2610.187.54.65 – 10.187.54.12610.187.54.127
2710.187.54.128/2610.187.54.129 – 10.187.54.19010.187.54.191
2810.187.54.192/2610.187.54.193 – 10.187.54.25410.187.54.255
2910.187.55.0/2610.187.55.1 – 10.187.55.6210.187.55.63
3010.187.55.64/2610.187.55.65 – 10.187.55.12610.187.55.127
3110.187.55.128/2610.187.55.129 – 10.187.55.19010.187.55.191
3210.187.55.192/2610.187.55.193 – 10.187.55.25410.187.55.255
3310.187.56.0/2610.187.56.1 – 10.187.56.6210.187.56.63
3410.187.56.64/2610.187.56.65 – 10.187.56.12610.187.56.127
3510.187.56.128/2610.187.56.129 – 10.187.56.19010.187.56.191
3610.187.56.192/2610.187.56.193 – 10.187.56.25410.187.56.255
3710.187.57.0/2610.187.57.1 – 10.187.57.6210.187.57.63
3810.187.57.64/2610.187.57.65 – 10.187.57.12610.187.57.127
3910.187.57.128/2610.187.57.129 – 10.187.57.19010.187.57.191
4010.187.57.192/2610.187.57.193 – 10.187.57.25410.187.57.255
4110.187.58.0/2610.187.58.1 – 10.187.58.6210.187.58.63
4210.187.58.64/2610.187.58.65 – 10.187.58.12610.187.58.127
4310.187.58.128/2610.187.58.129 – 10.187.58.19010.187.58.191
4410.187.58.192/2610.187.58.193 – 10.187.58.25410.187.58.255
4510.187.59.0/2610.187.59.1 – 10.187.59.6210.187.59.63
4610.187.59.64/2610.187.59.65 – 10.187.59.12610.187.59.127
4710.187.59.128/2610.187.59.129 – 10.187.59.19010.187.59.191
4810.187.59.192/2610.187.59.193 – 10.187.59.25410.187.59.255
4910.187.60.0/2610.187.60.1 – 10.187.60.6210.187.60.63
5010.187.60.64/2610.187.60.65 – 10.187.60.12610.187.60.127
5110.187.60.128/2610.187.60.129 – 10.187.60.19010.187.60.191
5210.187.60.192/2610.187.60.193 – 10.187.60.25410.187.60.255
5310.187.61.0/2610.187.61.1 – 10.187.61.6210.187.61.63
5410.187.61.64/2610.187.61.65 – 10.187.61.12610.187.61.127
5510.187.61.128/2610.187.61.129 – 10.187.61.19010.187.61.191
5610.187.61.192/2610.187.61.193 – 10.187.61.25410.187.61.255
5710.187.62.0/2610.187.62.1 – 10.187.62.6210.187.62.63
5810.187.62.64/2610.187.62.65 – 10.187.62.12610.187.62.127
5910.187.62.128/2610.187.62.129 – 10.187.62.19010.187.62.191
6010.187.62.192/2610.187.62.193 – 10.187.62.25410.187.62.255
6110.187.63.0/2610.187.63.1 – 10.187.63.6210.187.63.63
6210.187.63.64/2610.187.63.65 – 10.187.63.12610.187.63.127
6310.187.63.128/2610.187.63.129 – 10.187.63.19010.187.63.191
6410.187.63.192/2610.187.63.193 – 10.187.63.25410.187.63.255
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 →