ip
ipku.in

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)10.3.112.0/20
network10.3.112.0/20
broadcast10.3.127.255
first host10.3.112.1
last host10.3.127.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.3.112.0/20
address00001010.00000011.01110000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000011.01110000.00000000
broadcast00001010.00000011.01111111.11111111
green = network part, grey = host part
hex0x0a037000
decimal167997440
reverse dns0.112.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:7000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.112.0/2610.3.112.1 – 10.3.112.6210.3.112.63
210.3.112.64/2610.3.112.65 – 10.3.112.12610.3.112.127
310.3.112.128/2610.3.112.129 – 10.3.112.19010.3.112.191
410.3.112.192/2610.3.112.193 – 10.3.112.25410.3.112.255
510.3.113.0/2610.3.113.1 – 10.3.113.6210.3.113.63
610.3.113.64/2610.3.113.65 – 10.3.113.12610.3.113.127
710.3.113.128/2610.3.113.129 – 10.3.113.19010.3.113.191
810.3.113.192/2610.3.113.193 – 10.3.113.25410.3.113.255
910.3.114.0/2610.3.114.1 – 10.3.114.6210.3.114.63
1010.3.114.64/2610.3.114.65 – 10.3.114.12610.3.114.127
1110.3.114.128/2610.3.114.129 – 10.3.114.19010.3.114.191
1210.3.114.192/2610.3.114.193 – 10.3.114.25410.3.114.255
1310.3.115.0/2610.3.115.1 – 10.3.115.6210.3.115.63
1410.3.115.64/2610.3.115.65 – 10.3.115.12610.3.115.127
1510.3.115.128/2610.3.115.129 – 10.3.115.19010.3.115.191
1610.3.115.192/2610.3.115.193 – 10.3.115.25410.3.115.255
1710.3.116.0/2610.3.116.1 – 10.3.116.6210.3.116.63
1810.3.116.64/2610.3.116.65 – 10.3.116.12610.3.116.127
1910.3.116.128/2610.3.116.129 – 10.3.116.19010.3.116.191
2010.3.116.192/2610.3.116.193 – 10.3.116.25410.3.116.255
2110.3.117.0/2610.3.117.1 – 10.3.117.6210.3.117.63
2210.3.117.64/2610.3.117.65 – 10.3.117.12610.3.117.127
2310.3.117.128/2610.3.117.129 – 10.3.117.19010.3.117.191
2410.3.117.192/2610.3.117.193 – 10.3.117.25410.3.117.255
2510.3.118.0/2610.3.118.1 – 10.3.118.6210.3.118.63
2610.3.118.64/2610.3.118.65 – 10.3.118.12610.3.118.127
2710.3.118.128/2610.3.118.129 – 10.3.118.19010.3.118.191
2810.3.118.192/2610.3.118.193 – 10.3.118.25410.3.118.255
2910.3.119.0/2610.3.119.1 – 10.3.119.6210.3.119.63
3010.3.119.64/2610.3.119.65 – 10.3.119.12610.3.119.127
3110.3.119.128/2610.3.119.129 – 10.3.119.19010.3.119.191
3210.3.119.192/2610.3.119.193 – 10.3.119.25410.3.119.255
3310.3.120.0/2610.3.120.1 – 10.3.120.6210.3.120.63
3410.3.120.64/2610.3.120.65 – 10.3.120.12610.3.120.127
3510.3.120.128/2610.3.120.129 – 10.3.120.19010.3.120.191
3610.3.120.192/2610.3.120.193 – 10.3.120.25410.3.120.255
3710.3.121.0/2610.3.121.1 – 10.3.121.6210.3.121.63
3810.3.121.64/2610.3.121.65 – 10.3.121.12610.3.121.127
3910.3.121.128/2610.3.121.129 – 10.3.121.19010.3.121.191
4010.3.121.192/2610.3.121.193 – 10.3.121.25410.3.121.255
4110.3.122.0/2610.3.122.1 – 10.3.122.6210.3.122.63
4210.3.122.64/2610.3.122.65 – 10.3.122.12610.3.122.127
4310.3.122.128/2610.3.122.129 – 10.3.122.19010.3.122.191
4410.3.122.192/2610.3.122.193 – 10.3.122.25410.3.122.255
4510.3.123.0/2610.3.123.1 – 10.3.123.6210.3.123.63
4610.3.123.64/2610.3.123.65 – 10.3.123.12610.3.123.127
4710.3.123.128/2610.3.123.129 – 10.3.123.19010.3.123.191
4810.3.123.192/2610.3.123.193 – 10.3.123.25410.3.123.255
4910.3.124.0/2610.3.124.1 – 10.3.124.6210.3.124.63
5010.3.124.64/2610.3.124.65 – 10.3.124.12610.3.124.127
5110.3.124.128/2610.3.124.129 – 10.3.124.19010.3.124.191
5210.3.124.192/2610.3.124.193 – 10.3.124.25410.3.124.255
5310.3.125.0/2610.3.125.1 – 10.3.125.6210.3.125.63
5410.3.125.64/2610.3.125.65 – 10.3.125.12610.3.125.127
5510.3.125.128/2610.3.125.129 – 10.3.125.19010.3.125.191
5610.3.125.192/2610.3.125.193 – 10.3.125.25410.3.125.255
5710.3.126.0/2610.3.126.1 – 10.3.126.6210.3.126.63
5810.3.126.64/2610.3.126.65 – 10.3.126.12610.3.126.127
5910.3.126.128/2610.3.126.129 – 10.3.126.19010.3.126.191
6010.3.126.192/2610.3.126.193 – 10.3.126.25410.3.126.255
6110.3.127.0/2610.3.127.1 – 10.3.127.6210.3.127.63
6210.3.127.64/2610.3.127.65 – 10.3.127.12610.3.127.127
6310.3.127.128/2610.3.127.129 – 10.3.127.19010.3.127.191
6410.3.127.192/2610.3.127.193 – 10.3.127.25410.3.127.255
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 →