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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)10.8.160.0/20
network10.8.160.0/20
broadcast10.8.175.255
first host10.8.160.1
last host10.8.175.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.8.160.0/20
address00001010.00001000.10100000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00001000.10100000.00000000
broadcast00001010.00001000.10101111.11111111
green = network part, grey = host part
hex0x0a08a000
decimal168337408
reverse dns0.160.8.10.in-addr.arpa
ipv4-mapped::ffff:a08:a000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.8.160.0/2610.8.160.1 – 10.8.160.6210.8.160.63
210.8.160.64/2610.8.160.65 – 10.8.160.12610.8.160.127
310.8.160.128/2610.8.160.129 – 10.8.160.19010.8.160.191
410.8.160.192/2610.8.160.193 – 10.8.160.25410.8.160.255
510.8.161.0/2610.8.161.1 – 10.8.161.6210.8.161.63
610.8.161.64/2610.8.161.65 – 10.8.161.12610.8.161.127
710.8.161.128/2610.8.161.129 – 10.8.161.19010.8.161.191
810.8.161.192/2610.8.161.193 – 10.8.161.25410.8.161.255
910.8.162.0/2610.8.162.1 – 10.8.162.6210.8.162.63
1010.8.162.64/2610.8.162.65 – 10.8.162.12610.8.162.127
1110.8.162.128/2610.8.162.129 – 10.8.162.19010.8.162.191
1210.8.162.192/2610.8.162.193 – 10.8.162.25410.8.162.255
1310.8.163.0/2610.8.163.1 – 10.8.163.6210.8.163.63
1410.8.163.64/2610.8.163.65 – 10.8.163.12610.8.163.127
1510.8.163.128/2610.8.163.129 – 10.8.163.19010.8.163.191
1610.8.163.192/2610.8.163.193 – 10.8.163.25410.8.163.255
1710.8.164.0/2610.8.164.1 – 10.8.164.6210.8.164.63
1810.8.164.64/2610.8.164.65 – 10.8.164.12610.8.164.127
1910.8.164.128/2610.8.164.129 – 10.8.164.19010.8.164.191
2010.8.164.192/2610.8.164.193 – 10.8.164.25410.8.164.255
2110.8.165.0/2610.8.165.1 – 10.8.165.6210.8.165.63
2210.8.165.64/2610.8.165.65 – 10.8.165.12610.8.165.127
2310.8.165.128/2610.8.165.129 – 10.8.165.19010.8.165.191
2410.8.165.192/2610.8.165.193 – 10.8.165.25410.8.165.255
2510.8.166.0/2610.8.166.1 – 10.8.166.6210.8.166.63
2610.8.166.64/2610.8.166.65 – 10.8.166.12610.8.166.127
2710.8.166.128/2610.8.166.129 – 10.8.166.19010.8.166.191
2810.8.166.192/2610.8.166.193 – 10.8.166.25410.8.166.255
2910.8.167.0/2610.8.167.1 – 10.8.167.6210.8.167.63
3010.8.167.64/2610.8.167.65 – 10.8.167.12610.8.167.127
3110.8.167.128/2610.8.167.129 – 10.8.167.19010.8.167.191
3210.8.167.192/2610.8.167.193 – 10.8.167.25410.8.167.255
3310.8.168.0/2610.8.168.1 – 10.8.168.6210.8.168.63
3410.8.168.64/2610.8.168.65 – 10.8.168.12610.8.168.127
3510.8.168.128/2610.8.168.129 – 10.8.168.19010.8.168.191
3610.8.168.192/2610.8.168.193 – 10.8.168.25410.8.168.255
3710.8.169.0/2610.8.169.1 – 10.8.169.6210.8.169.63
3810.8.169.64/2610.8.169.65 – 10.8.169.12610.8.169.127
3910.8.169.128/2610.8.169.129 – 10.8.169.19010.8.169.191
4010.8.169.192/2610.8.169.193 – 10.8.169.25410.8.169.255
4110.8.170.0/2610.8.170.1 – 10.8.170.6210.8.170.63
4210.8.170.64/2610.8.170.65 – 10.8.170.12610.8.170.127
4310.8.170.128/2610.8.170.129 – 10.8.170.19010.8.170.191
4410.8.170.192/2610.8.170.193 – 10.8.170.25410.8.170.255
4510.8.171.0/2610.8.171.1 – 10.8.171.6210.8.171.63
4610.8.171.64/2610.8.171.65 – 10.8.171.12610.8.171.127
4710.8.171.128/2610.8.171.129 – 10.8.171.19010.8.171.191
4810.8.171.192/2610.8.171.193 – 10.8.171.25410.8.171.255
4910.8.172.0/2610.8.172.1 – 10.8.172.6210.8.172.63
5010.8.172.64/2610.8.172.65 – 10.8.172.12610.8.172.127
5110.8.172.128/2610.8.172.129 – 10.8.172.19010.8.172.191
5210.8.172.192/2610.8.172.193 – 10.8.172.25410.8.172.255
5310.8.173.0/2610.8.173.1 – 10.8.173.6210.8.173.63
5410.8.173.64/2610.8.173.65 – 10.8.173.12610.8.173.127
5510.8.173.128/2610.8.173.129 – 10.8.173.19010.8.173.191
5610.8.173.192/2610.8.173.193 – 10.8.173.25410.8.173.255
5710.8.174.0/2610.8.174.1 – 10.8.174.6210.8.174.63
5810.8.174.64/2610.8.174.65 – 10.8.174.12610.8.174.127
5910.8.174.128/2610.8.174.129 – 10.8.174.19010.8.174.191
6010.8.174.192/2610.8.174.193 – 10.8.174.25410.8.174.255
6110.8.175.0/2610.8.175.1 – 10.8.175.6210.8.175.63
6210.8.175.64/2610.8.175.65 – 10.8.175.12610.8.175.127
6310.8.175.128/2610.8.175.129 – 10.8.175.19010.8.175.191
6410.8.175.192/2610.8.175.193 – 10.8.175.25410.8.175.255
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 →