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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)10.45.96.0/20
network10.45.96.0/20
broadcast10.45.111.255
first host10.45.96.1
last host10.45.111.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.45.96.0/20
address00001010.00101101.01100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00101101.01100000.00000000
broadcast00001010.00101101.01101111.11111111
green = network part, grey = host part
hex0x0a2d6000
decimal170745856
reverse dns0.96.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:6000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.96.0/2610.45.96.1 – 10.45.96.6210.45.96.63
210.45.96.64/2610.45.96.65 – 10.45.96.12610.45.96.127
310.45.96.128/2610.45.96.129 – 10.45.96.19010.45.96.191
410.45.96.192/2610.45.96.193 – 10.45.96.25410.45.96.255
510.45.97.0/2610.45.97.1 – 10.45.97.6210.45.97.63
610.45.97.64/2610.45.97.65 – 10.45.97.12610.45.97.127
710.45.97.128/2610.45.97.129 – 10.45.97.19010.45.97.191
810.45.97.192/2610.45.97.193 – 10.45.97.25410.45.97.255
910.45.98.0/2610.45.98.1 – 10.45.98.6210.45.98.63
1010.45.98.64/2610.45.98.65 – 10.45.98.12610.45.98.127
1110.45.98.128/2610.45.98.129 – 10.45.98.19010.45.98.191
1210.45.98.192/2610.45.98.193 – 10.45.98.25410.45.98.255
1310.45.99.0/2610.45.99.1 – 10.45.99.6210.45.99.63
1410.45.99.64/2610.45.99.65 – 10.45.99.12610.45.99.127
1510.45.99.128/2610.45.99.129 – 10.45.99.19010.45.99.191
1610.45.99.192/2610.45.99.193 – 10.45.99.25410.45.99.255
1710.45.100.0/2610.45.100.1 – 10.45.100.6210.45.100.63
1810.45.100.64/2610.45.100.65 – 10.45.100.12610.45.100.127
1910.45.100.128/2610.45.100.129 – 10.45.100.19010.45.100.191
2010.45.100.192/2610.45.100.193 – 10.45.100.25410.45.100.255
2110.45.101.0/2610.45.101.1 – 10.45.101.6210.45.101.63
2210.45.101.64/2610.45.101.65 – 10.45.101.12610.45.101.127
2310.45.101.128/2610.45.101.129 – 10.45.101.19010.45.101.191
2410.45.101.192/2610.45.101.193 – 10.45.101.25410.45.101.255
2510.45.102.0/2610.45.102.1 – 10.45.102.6210.45.102.63
2610.45.102.64/2610.45.102.65 – 10.45.102.12610.45.102.127
2710.45.102.128/2610.45.102.129 – 10.45.102.19010.45.102.191
2810.45.102.192/2610.45.102.193 – 10.45.102.25410.45.102.255
2910.45.103.0/2610.45.103.1 – 10.45.103.6210.45.103.63
3010.45.103.64/2610.45.103.65 – 10.45.103.12610.45.103.127
3110.45.103.128/2610.45.103.129 – 10.45.103.19010.45.103.191
3210.45.103.192/2610.45.103.193 – 10.45.103.25410.45.103.255
3310.45.104.0/2610.45.104.1 – 10.45.104.6210.45.104.63
3410.45.104.64/2610.45.104.65 – 10.45.104.12610.45.104.127
3510.45.104.128/2610.45.104.129 – 10.45.104.19010.45.104.191
3610.45.104.192/2610.45.104.193 – 10.45.104.25410.45.104.255
3710.45.105.0/2610.45.105.1 – 10.45.105.6210.45.105.63
3810.45.105.64/2610.45.105.65 – 10.45.105.12610.45.105.127
3910.45.105.128/2610.45.105.129 – 10.45.105.19010.45.105.191
4010.45.105.192/2610.45.105.193 – 10.45.105.25410.45.105.255
4110.45.106.0/2610.45.106.1 – 10.45.106.6210.45.106.63
4210.45.106.64/2610.45.106.65 – 10.45.106.12610.45.106.127
4310.45.106.128/2610.45.106.129 – 10.45.106.19010.45.106.191
4410.45.106.192/2610.45.106.193 – 10.45.106.25410.45.106.255
4510.45.107.0/2610.45.107.1 – 10.45.107.6210.45.107.63
4610.45.107.64/2610.45.107.65 – 10.45.107.12610.45.107.127
4710.45.107.128/2610.45.107.129 – 10.45.107.19010.45.107.191
4810.45.107.192/2610.45.107.193 – 10.45.107.25410.45.107.255
4910.45.108.0/2610.45.108.1 – 10.45.108.6210.45.108.63
5010.45.108.64/2610.45.108.65 – 10.45.108.12610.45.108.127
5110.45.108.128/2610.45.108.129 – 10.45.108.19010.45.108.191
5210.45.108.192/2610.45.108.193 – 10.45.108.25410.45.108.255
5310.45.109.0/2610.45.109.1 – 10.45.109.6210.45.109.63
5410.45.109.64/2610.45.109.65 – 10.45.109.12610.45.109.127
5510.45.109.128/2610.45.109.129 – 10.45.109.19010.45.109.191
5610.45.109.192/2610.45.109.193 – 10.45.109.25410.45.109.255
5710.45.110.0/2610.45.110.1 – 10.45.110.6210.45.110.63
5810.45.110.64/2610.45.110.65 – 10.45.110.12610.45.110.127
5910.45.110.128/2610.45.110.129 – 10.45.110.19010.45.110.191
6010.45.110.192/2610.45.110.193 – 10.45.110.25410.45.110.255
6110.45.111.0/2610.45.111.1 – 10.45.111.6210.45.111.63
6210.45.111.64/2610.45.111.65 – 10.45.111.12610.45.111.127
6310.45.111.128/2610.45.111.129 – 10.45.111.19010.45.111.191
6410.45.111.192/2610.45.111.193 – 10.45.111.25410.45.111.255
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 →