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)10.19.128.0/18
network10.19.128.0/18
broadcast10.19.191.255
first host10.19.128.1
last host10.19.191.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.19.128.0/18
address00001010.00010011.10000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010011.10000000.00000000
broadcast00001010.00010011.10111111.11111111
green = network part, grey = host part
hex0x0a138000
decimal169050112
reverse dns0.128.19.10.in-addr.arpa
ipv4-mapped::ffff:a13:8000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.19.128.0/2510.19.128.1 – 10.19.128.12610.19.128.127
210.19.128.128/2510.19.128.129 – 10.19.128.25410.19.128.255
310.19.129.0/2510.19.129.1 – 10.19.129.12610.19.129.127
410.19.129.128/2510.19.129.129 – 10.19.129.25410.19.129.255
510.19.130.0/2510.19.130.1 – 10.19.130.12610.19.130.127
610.19.130.128/2510.19.130.129 – 10.19.130.25410.19.130.255
710.19.131.0/2510.19.131.1 – 10.19.131.12610.19.131.127
810.19.131.128/2510.19.131.129 – 10.19.131.25410.19.131.255
910.19.132.0/2510.19.132.1 – 10.19.132.12610.19.132.127
1010.19.132.128/2510.19.132.129 – 10.19.132.25410.19.132.255
1110.19.133.0/2510.19.133.1 – 10.19.133.12610.19.133.127
1210.19.133.128/2510.19.133.129 – 10.19.133.25410.19.133.255
1310.19.134.0/2510.19.134.1 – 10.19.134.12610.19.134.127
1410.19.134.128/2510.19.134.129 – 10.19.134.25410.19.134.255
1510.19.135.0/2510.19.135.1 – 10.19.135.12610.19.135.127
1610.19.135.128/2510.19.135.129 – 10.19.135.25410.19.135.255
1710.19.136.0/2510.19.136.1 – 10.19.136.12610.19.136.127
1810.19.136.128/2510.19.136.129 – 10.19.136.25410.19.136.255
1910.19.137.0/2510.19.137.1 – 10.19.137.12610.19.137.127
2010.19.137.128/2510.19.137.129 – 10.19.137.25410.19.137.255
2110.19.138.0/2510.19.138.1 – 10.19.138.12610.19.138.127
2210.19.138.128/2510.19.138.129 – 10.19.138.25410.19.138.255
2310.19.139.0/2510.19.139.1 – 10.19.139.12610.19.139.127
2410.19.139.128/2510.19.139.129 – 10.19.139.25410.19.139.255
2510.19.140.0/2510.19.140.1 – 10.19.140.12610.19.140.127
2610.19.140.128/2510.19.140.129 – 10.19.140.25410.19.140.255
2710.19.141.0/2510.19.141.1 – 10.19.141.12610.19.141.127
2810.19.141.128/2510.19.141.129 – 10.19.141.25410.19.141.255
2910.19.142.0/2510.19.142.1 – 10.19.142.12610.19.142.127
3010.19.142.128/2510.19.142.129 – 10.19.142.25410.19.142.255
3110.19.143.0/2510.19.143.1 – 10.19.143.12610.19.143.127
3210.19.143.128/2510.19.143.129 – 10.19.143.25410.19.143.255
3310.19.144.0/2510.19.144.1 – 10.19.144.12610.19.144.127
3410.19.144.128/2510.19.144.129 – 10.19.144.25410.19.144.255
3510.19.145.0/2510.19.145.1 – 10.19.145.12610.19.145.127
3610.19.145.128/2510.19.145.129 – 10.19.145.25410.19.145.255
3710.19.146.0/2510.19.146.1 – 10.19.146.12610.19.146.127
3810.19.146.128/2510.19.146.129 – 10.19.146.25410.19.146.255
3910.19.147.0/2510.19.147.1 – 10.19.147.12610.19.147.127
4010.19.147.128/2510.19.147.129 – 10.19.147.25410.19.147.255
4110.19.148.0/2510.19.148.1 – 10.19.148.12610.19.148.127
4210.19.148.128/2510.19.148.129 – 10.19.148.25410.19.148.255
4310.19.149.0/2510.19.149.1 – 10.19.149.12610.19.149.127
4410.19.149.128/2510.19.149.129 – 10.19.149.25410.19.149.255
4510.19.150.0/2510.19.150.1 – 10.19.150.12610.19.150.127
4610.19.150.128/2510.19.150.129 – 10.19.150.25410.19.150.255
4710.19.151.0/2510.19.151.1 – 10.19.151.12610.19.151.127
4810.19.151.128/2510.19.151.129 – 10.19.151.25410.19.151.255
4910.19.152.0/2510.19.152.1 – 10.19.152.12610.19.152.127
5010.19.152.128/2510.19.152.129 – 10.19.152.25410.19.152.255
5110.19.153.0/2510.19.153.1 – 10.19.153.12610.19.153.127
5210.19.153.128/2510.19.153.129 – 10.19.153.25410.19.153.255
5310.19.154.0/2510.19.154.1 – 10.19.154.12610.19.154.127
5410.19.154.128/2510.19.154.129 – 10.19.154.25410.19.154.255
5510.19.155.0/2510.19.155.1 – 10.19.155.12610.19.155.127
5610.19.155.128/2510.19.155.129 – 10.19.155.25410.19.155.255
5710.19.156.0/2510.19.156.1 – 10.19.156.12610.19.156.127
5810.19.156.128/2510.19.156.129 – 10.19.156.25410.19.156.255
5910.19.157.0/2510.19.157.1 – 10.19.157.12610.19.157.127
6010.19.157.128/2510.19.157.129 – 10.19.157.25410.19.157.255
6110.19.158.0/2510.19.158.1 – 10.19.158.12610.19.158.127
6210.19.158.128/2510.19.158.129 – 10.19.158.25410.19.158.255
6310.19.159.0/2510.19.159.1 – 10.19.159.12610.19.159.127
6410.19.159.128/2510.19.159.129 – 10.19.159.25410.19.159.255
6510.19.160.0/2510.19.160.1 – 10.19.160.12610.19.160.127
6610.19.160.128/2510.19.160.129 – 10.19.160.25410.19.160.255
6710.19.161.0/2510.19.161.1 – 10.19.161.12610.19.161.127
6810.19.161.128/2510.19.161.129 – 10.19.161.25410.19.161.255
6910.19.162.0/2510.19.162.1 – 10.19.162.12610.19.162.127
7010.19.162.128/2510.19.162.129 – 10.19.162.25410.19.162.255
7110.19.163.0/2510.19.163.1 – 10.19.163.12610.19.163.127
7210.19.163.128/2510.19.163.129 – 10.19.163.25410.19.163.255
7310.19.164.0/2510.19.164.1 – 10.19.164.12610.19.164.127
7410.19.164.128/2510.19.164.129 – 10.19.164.25410.19.164.255
7510.19.165.0/2510.19.165.1 – 10.19.165.12610.19.165.127
7610.19.165.128/2510.19.165.129 – 10.19.165.25410.19.165.255
7710.19.166.0/2510.19.166.1 – 10.19.166.12610.19.166.127
7810.19.166.128/2510.19.166.129 – 10.19.166.25410.19.166.255
7910.19.167.0/2510.19.167.1 – 10.19.167.12610.19.167.127
8010.19.167.128/2510.19.167.129 – 10.19.167.25410.19.167.255
8110.19.168.0/2510.19.168.1 – 10.19.168.12610.19.168.127
8210.19.168.128/2510.19.168.129 – 10.19.168.25410.19.168.255
8310.19.169.0/2510.19.169.1 – 10.19.169.12610.19.169.127
8410.19.169.128/2510.19.169.129 – 10.19.169.25410.19.169.255
8510.19.170.0/2510.19.170.1 – 10.19.170.12610.19.170.127
8610.19.170.128/2510.19.170.129 – 10.19.170.25410.19.170.255
8710.19.171.0/2510.19.171.1 – 10.19.171.12610.19.171.127
8810.19.171.128/2510.19.171.129 – 10.19.171.25410.19.171.255
8910.19.172.0/2510.19.172.1 – 10.19.172.12610.19.172.127
9010.19.172.128/2510.19.172.129 – 10.19.172.25410.19.172.255
9110.19.173.0/2510.19.173.1 – 10.19.173.12610.19.173.127
9210.19.173.128/2510.19.173.129 – 10.19.173.25410.19.173.255
9310.19.174.0/2510.19.174.1 – 10.19.174.12610.19.174.127
9410.19.174.128/2510.19.174.129 – 10.19.174.25410.19.174.255
9510.19.175.0/2510.19.175.1 – 10.19.175.12610.19.175.127
9610.19.175.128/2510.19.175.129 – 10.19.175.25410.19.175.255
9710.19.176.0/2510.19.176.1 – 10.19.176.12610.19.176.127
9810.19.176.128/2510.19.176.129 – 10.19.176.25410.19.176.255
9910.19.177.0/2510.19.177.1 – 10.19.177.12610.19.177.127
10010.19.177.128/2510.19.177.129 – 10.19.177.25410.19.177.255
10110.19.178.0/2510.19.178.1 – 10.19.178.12610.19.178.127
10210.19.178.128/2510.19.178.129 – 10.19.178.25410.19.178.255
10310.19.179.0/2510.19.179.1 – 10.19.179.12610.19.179.127
10410.19.179.128/2510.19.179.129 – 10.19.179.25410.19.179.255
10510.19.180.0/2510.19.180.1 – 10.19.180.12610.19.180.127
10610.19.180.128/2510.19.180.129 – 10.19.180.25410.19.180.255
10710.19.181.0/2510.19.181.1 – 10.19.181.12610.19.181.127
10810.19.181.128/2510.19.181.129 – 10.19.181.25410.19.181.255
10910.19.182.0/2510.19.182.1 – 10.19.182.12610.19.182.127
11010.19.182.128/2510.19.182.129 – 10.19.182.25410.19.182.255
11110.19.183.0/2510.19.183.1 – 10.19.183.12610.19.183.127
11210.19.183.128/2510.19.183.129 – 10.19.183.25410.19.183.255
11310.19.184.0/2510.19.184.1 – 10.19.184.12610.19.184.127
11410.19.184.128/2510.19.184.129 – 10.19.184.25410.19.184.255
11510.19.185.0/2510.19.185.1 – 10.19.185.12610.19.185.127
11610.19.185.128/2510.19.185.129 – 10.19.185.25410.19.185.255
11710.19.186.0/2510.19.186.1 – 10.19.186.12610.19.186.127
11810.19.186.128/2510.19.186.129 – 10.19.186.25410.19.186.255
11910.19.187.0/2510.19.187.1 – 10.19.187.12610.19.187.127
12010.19.187.128/2510.19.187.129 – 10.19.187.25410.19.187.255
12110.19.188.0/2510.19.188.1 – 10.19.188.12610.19.188.127
12210.19.188.128/2510.19.188.129 – 10.19.188.25410.19.188.255
12310.19.189.0/2510.19.189.1 – 10.19.189.12610.19.189.127
12410.19.189.128/2510.19.189.129 – 10.19.189.25410.19.189.255
12510.19.190.0/2510.19.190.1 – 10.19.190.12610.19.190.127
12610.19.190.128/2510.19.190.129 – 10.19.190.25410.19.190.255
12710.19.191.0/2510.19.191.1 – 10.19.191.12610.19.191.127
12810.19.191.128/2510.19.191.129 – 10.19.191.25410.19.191.255
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 →