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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)10.12.128.0/18
network10.12.128.0/18
broadcast10.12.191.255
first host10.12.128.1
last host10.12.191.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.12.128.0/18
address00001010.00001100.10000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00001100.10000000.00000000
broadcast00001010.00001100.10111111.11111111
green = network part, grey = host part
hex0x0a0c8000
decimal168591360
reverse dns0.128.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:8000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.128.0/2410.12.128.1 – 10.12.128.25410.12.128.255
210.12.129.0/2410.12.129.1 – 10.12.129.25410.12.129.255
310.12.130.0/2410.12.130.1 – 10.12.130.25410.12.130.255
410.12.131.0/2410.12.131.1 – 10.12.131.25410.12.131.255
510.12.132.0/2410.12.132.1 – 10.12.132.25410.12.132.255
610.12.133.0/2410.12.133.1 – 10.12.133.25410.12.133.255
710.12.134.0/2410.12.134.1 – 10.12.134.25410.12.134.255
810.12.135.0/2410.12.135.1 – 10.12.135.25410.12.135.255
910.12.136.0/2410.12.136.1 – 10.12.136.25410.12.136.255
1010.12.137.0/2410.12.137.1 – 10.12.137.25410.12.137.255
1110.12.138.0/2410.12.138.1 – 10.12.138.25410.12.138.255
1210.12.139.0/2410.12.139.1 – 10.12.139.25410.12.139.255
1310.12.140.0/2410.12.140.1 – 10.12.140.25410.12.140.255
1410.12.141.0/2410.12.141.1 – 10.12.141.25410.12.141.255
1510.12.142.0/2410.12.142.1 – 10.12.142.25410.12.142.255
1610.12.143.0/2410.12.143.1 – 10.12.143.25410.12.143.255
1710.12.144.0/2410.12.144.1 – 10.12.144.25410.12.144.255
1810.12.145.0/2410.12.145.1 – 10.12.145.25410.12.145.255
1910.12.146.0/2410.12.146.1 – 10.12.146.25410.12.146.255
2010.12.147.0/2410.12.147.1 – 10.12.147.25410.12.147.255
2110.12.148.0/2410.12.148.1 – 10.12.148.25410.12.148.255
2210.12.149.0/2410.12.149.1 – 10.12.149.25410.12.149.255
2310.12.150.0/2410.12.150.1 – 10.12.150.25410.12.150.255
2410.12.151.0/2410.12.151.1 – 10.12.151.25410.12.151.255
2510.12.152.0/2410.12.152.1 – 10.12.152.25410.12.152.255
2610.12.153.0/2410.12.153.1 – 10.12.153.25410.12.153.255
2710.12.154.0/2410.12.154.1 – 10.12.154.25410.12.154.255
2810.12.155.0/2410.12.155.1 – 10.12.155.25410.12.155.255
2910.12.156.0/2410.12.156.1 – 10.12.156.25410.12.156.255
3010.12.157.0/2410.12.157.1 – 10.12.157.25410.12.157.255
3110.12.158.0/2410.12.158.1 – 10.12.158.25410.12.158.255
3210.12.159.0/2410.12.159.1 – 10.12.159.25410.12.159.255
3310.12.160.0/2410.12.160.1 – 10.12.160.25410.12.160.255
3410.12.161.0/2410.12.161.1 – 10.12.161.25410.12.161.255
3510.12.162.0/2410.12.162.1 – 10.12.162.25410.12.162.255
3610.12.163.0/2410.12.163.1 – 10.12.163.25410.12.163.255
3710.12.164.0/2410.12.164.1 – 10.12.164.25410.12.164.255
3810.12.165.0/2410.12.165.1 – 10.12.165.25410.12.165.255
3910.12.166.0/2410.12.166.1 – 10.12.166.25410.12.166.255
4010.12.167.0/2410.12.167.1 – 10.12.167.25410.12.167.255
4110.12.168.0/2410.12.168.1 – 10.12.168.25410.12.168.255
4210.12.169.0/2410.12.169.1 – 10.12.169.25410.12.169.255
4310.12.170.0/2410.12.170.1 – 10.12.170.25410.12.170.255
4410.12.171.0/2410.12.171.1 – 10.12.171.25410.12.171.255
4510.12.172.0/2410.12.172.1 – 10.12.172.25410.12.172.255
4610.12.173.0/2410.12.173.1 – 10.12.173.25410.12.173.255
4710.12.174.0/2410.12.174.1 – 10.12.174.25410.12.174.255
4810.12.175.0/2410.12.175.1 – 10.12.175.25410.12.175.255
4910.12.176.0/2410.12.176.1 – 10.12.176.25410.12.176.255
5010.12.177.0/2410.12.177.1 – 10.12.177.25410.12.177.255
5110.12.178.0/2410.12.178.1 – 10.12.178.25410.12.178.255
5210.12.179.0/2410.12.179.1 – 10.12.179.25410.12.179.255
5310.12.180.0/2410.12.180.1 – 10.12.180.25410.12.180.255
5410.12.181.0/2410.12.181.1 – 10.12.181.25410.12.181.255
5510.12.182.0/2410.12.182.1 – 10.12.182.25410.12.182.255
5610.12.183.0/2410.12.183.1 – 10.12.183.25410.12.183.255
5710.12.184.0/2410.12.184.1 – 10.12.184.25410.12.184.255
5810.12.185.0/2410.12.185.1 – 10.12.185.25410.12.185.255
5910.12.186.0/2410.12.186.1 – 10.12.186.25410.12.186.255
6010.12.187.0/2410.12.187.1 – 10.12.187.25410.12.187.255
6110.12.188.0/2410.12.188.1 – 10.12.188.25410.12.188.255
6210.12.189.0/2410.12.189.1 – 10.12.189.25410.12.189.255
6310.12.190.0/2410.12.190.1 – 10.12.190.25410.12.190.255
6410.12.191.0/2410.12.191.1 – 10.12.191.25410.12.191.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /18
/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-
/18255.255.192.016,38416,3821
/19255.255.224.08,1928,1902 split →
/20255.255.240.04,0964,0944 split →
/21255.255.248.02,0482,0468 split →
/22255.255.252.01,0241,02216 split →
/23255.255.254.051251032 split →
/24255.255.255.025625464 split →
/25255.255.255.128128126128 split →
/26255.255.255.1926462256 split →
/27255.255.255.2243230512 split →
/28255.255.255.24016141,024 split →
/29255.255.255.248862,048 split →
/30255.255.255.252424,096 split →
/31255.255.255.254228,192 split →
/32255.255.255.2551116,384 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 →