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)10.72.64.0/18
network10.72.64.0/18
broadcast10.72.127.255
first host10.72.64.1
last host10.72.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.72.64.0/18
address00001010.01001000.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.01001000.01000000.00000000
broadcast00001010.01001000.01111111.11111111
green = network part, grey = host part
hex0x0a484000
decimal172507136
reverse dns0.64.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:4000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.72.64.0/2510.72.64.1 – 10.72.64.12610.72.64.127
210.72.64.128/2510.72.64.129 – 10.72.64.25410.72.64.255
310.72.65.0/2510.72.65.1 – 10.72.65.12610.72.65.127
410.72.65.128/2510.72.65.129 – 10.72.65.25410.72.65.255
510.72.66.0/2510.72.66.1 – 10.72.66.12610.72.66.127
610.72.66.128/2510.72.66.129 – 10.72.66.25410.72.66.255
710.72.67.0/2510.72.67.1 – 10.72.67.12610.72.67.127
810.72.67.128/2510.72.67.129 – 10.72.67.25410.72.67.255
910.72.68.0/2510.72.68.1 – 10.72.68.12610.72.68.127
1010.72.68.128/2510.72.68.129 – 10.72.68.25410.72.68.255
1110.72.69.0/2510.72.69.1 – 10.72.69.12610.72.69.127
1210.72.69.128/2510.72.69.129 – 10.72.69.25410.72.69.255
1310.72.70.0/2510.72.70.1 – 10.72.70.12610.72.70.127
1410.72.70.128/2510.72.70.129 – 10.72.70.25410.72.70.255
1510.72.71.0/2510.72.71.1 – 10.72.71.12610.72.71.127
1610.72.71.128/2510.72.71.129 – 10.72.71.25410.72.71.255
1710.72.72.0/2510.72.72.1 – 10.72.72.12610.72.72.127
1810.72.72.128/2510.72.72.129 – 10.72.72.25410.72.72.255
1910.72.73.0/2510.72.73.1 – 10.72.73.12610.72.73.127
2010.72.73.128/2510.72.73.129 – 10.72.73.25410.72.73.255
2110.72.74.0/2510.72.74.1 – 10.72.74.12610.72.74.127
2210.72.74.128/2510.72.74.129 – 10.72.74.25410.72.74.255
2310.72.75.0/2510.72.75.1 – 10.72.75.12610.72.75.127
2410.72.75.128/2510.72.75.129 – 10.72.75.25410.72.75.255
2510.72.76.0/2510.72.76.1 – 10.72.76.12610.72.76.127
2610.72.76.128/2510.72.76.129 – 10.72.76.25410.72.76.255
2710.72.77.0/2510.72.77.1 – 10.72.77.12610.72.77.127
2810.72.77.128/2510.72.77.129 – 10.72.77.25410.72.77.255
2910.72.78.0/2510.72.78.1 – 10.72.78.12610.72.78.127
3010.72.78.128/2510.72.78.129 – 10.72.78.25410.72.78.255
3110.72.79.0/2510.72.79.1 – 10.72.79.12610.72.79.127
3210.72.79.128/2510.72.79.129 – 10.72.79.25410.72.79.255
3310.72.80.0/2510.72.80.1 – 10.72.80.12610.72.80.127
3410.72.80.128/2510.72.80.129 – 10.72.80.25410.72.80.255
3510.72.81.0/2510.72.81.1 – 10.72.81.12610.72.81.127
3610.72.81.128/2510.72.81.129 – 10.72.81.25410.72.81.255
3710.72.82.0/2510.72.82.1 – 10.72.82.12610.72.82.127
3810.72.82.128/2510.72.82.129 – 10.72.82.25410.72.82.255
3910.72.83.0/2510.72.83.1 – 10.72.83.12610.72.83.127
4010.72.83.128/2510.72.83.129 – 10.72.83.25410.72.83.255
4110.72.84.0/2510.72.84.1 – 10.72.84.12610.72.84.127
4210.72.84.128/2510.72.84.129 – 10.72.84.25410.72.84.255
4310.72.85.0/2510.72.85.1 – 10.72.85.12610.72.85.127
4410.72.85.128/2510.72.85.129 – 10.72.85.25410.72.85.255
4510.72.86.0/2510.72.86.1 – 10.72.86.12610.72.86.127
4610.72.86.128/2510.72.86.129 – 10.72.86.25410.72.86.255
4710.72.87.0/2510.72.87.1 – 10.72.87.12610.72.87.127
4810.72.87.128/2510.72.87.129 – 10.72.87.25410.72.87.255
4910.72.88.0/2510.72.88.1 – 10.72.88.12610.72.88.127
5010.72.88.128/2510.72.88.129 – 10.72.88.25410.72.88.255
5110.72.89.0/2510.72.89.1 – 10.72.89.12610.72.89.127
5210.72.89.128/2510.72.89.129 – 10.72.89.25410.72.89.255
5310.72.90.0/2510.72.90.1 – 10.72.90.12610.72.90.127
5410.72.90.128/2510.72.90.129 – 10.72.90.25410.72.90.255
5510.72.91.0/2510.72.91.1 – 10.72.91.12610.72.91.127
5610.72.91.128/2510.72.91.129 – 10.72.91.25410.72.91.255
5710.72.92.0/2510.72.92.1 – 10.72.92.12610.72.92.127
5810.72.92.128/2510.72.92.129 – 10.72.92.25410.72.92.255
5910.72.93.0/2510.72.93.1 – 10.72.93.12610.72.93.127
6010.72.93.128/2510.72.93.129 – 10.72.93.25410.72.93.255
6110.72.94.0/2510.72.94.1 – 10.72.94.12610.72.94.127
6210.72.94.128/2510.72.94.129 – 10.72.94.25410.72.94.255
6310.72.95.0/2510.72.95.1 – 10.72.95.12610.72.95.127
6410.72.95.128/2510.72.95.129 – 10.72.95.25410.72.95.255
6510.72.96.0/2510.72.96.1 – 10.72.96.12610.72.96.127
6610.72.96.128/2510.72.96.129 – 10.72.96.25410.72.96.255
6710.72.97.0/2510.72.97.1 – 10.72.97.12610.72.97.127
6810.72.97.128/2510.72.97.129 – 10.72.97.25410.72.97.255
6910.72.98.0/2510.72.98.1 – 10.72.98.12610.72.98.127
7010.72.98.128/2510.72.98.129 – 10.72.98.25410.72.98.255
7110.72.99.0/2510.72.99.1 – 10.72.99.12610.72.99.127
7210.72.99.128/2510.72.99.129 – 10.72.99.25410.72.99.255
7310.72.100.0/2510.72.100.1 – 10.72.100.12610.72.100.127
7410.72.100.128/2510.72.100.129 – 10.72.100.25410.72.100.255
7510.72.101.0/2510.72.101.1 – 10.72.101.12610.72.101.127
7610.72.101.128/2510.72.101.129 – 10.72.101.25410.72.101.255
7710.72.102.0/2510.72.102.1 – 10.72.102.12610.72.102.127
7810.72.102.128/2510.72.102.129 – 10.72.102.25410.72.102.255
7910.72.103.0/2510.72.103.1 – 10.72.103.12610.72.103.127
8010.72.103.128/2510.72.103.129 – 10.72.103.25410.72.103.255
8110.72.104.0/2510.72.104.1 – 10.72.104.12610.72.104.127
8210.72.104.128/2510.72.104.129 – 10.72.104.25410.72.104.255
8310.72.105.0/2510.72.105.1 – 10.72.105.12610.72.105.127
8410.72.105.128/2510.72.105.129 – 10.72.105.25410.72.105.255
8510.72.106.0/2510.72.106.1 – 10.72.106.12610.72.106.127
8610.72.106.128/2510.72.106.129 – 10.72.106.25410.72.106.255
8710.72.107.0/2510.72.107.1 – 10.72.107.12610.72.107.127
8810.72.107.128/2510.72.107.129 – 10.72.107.25410.72.107.255
8910.72.108.0/2510.72.108.1 – 10.72.108.12610.72.108.127
9010.72.108.128/2510.72.108.129 – 10.72.108.25410.72.108.255
9110.72.109.0/2510.72.109.1 – 10.72.109.12610.72.109.127
9210.72.109.128/2510.72.109.129 – 10.72.109.25410.72.109.255
9310.72.110.0/2510.72.110.1 – 10.72.110.12610.72.110.127
9410.72.110.128/2510.72.110.129 – 10.72.110.25410.72.110.255
9510.72.111.0/2510.72.111.1 – 10.72.111.12610.72.111.127
9610.72.111.128/2510.72.111.129 – 10.72.111.25410.72.111.255
9710.72.112.0/2510.72.112.1 – 10.72.112.12610.72.112.127
9810.72.112.128/2510.72.112.129 – 10.72.112.25410.72.112.255
9910.72.113.0/2510.72.113.1 – 10.72.113.12610.72.113.127
10010.72.113.128/2510.72.113.129 – 10.72.113.25410.72.113.255
10110.72.114.0/2510.72.114.1 – 10.72.114.12610.72.114.127
10210.72.114.128/2510.72.114.129 – 10.72.114.25410.72.114.255
10310.72.115.0/2510.72.115.1 – 10.72.115.12610.72.115.127
10410.72.115.128/2510.72.115.129 – 10.72.115.25410.72.115.255
10510.72.116.0/2510.72.116.1 – 10.72.116.12610.72.116.127
10610.72.116.128/2510.72.116.129 – 10.72.116.25410.72.116.255
10710.72.117.0/2510.72.117.1 – 10.72.117.12610.72.117.127
10810.72.117.128/2510.72.117.129 – 10.72.117.25410.72.117.255
10910.72.118.0/2510.72.118.1 – 10.72.118.12610.72.118.127
11010.72.118.128/2510.72.118.129 – 10.72.118.25410.72.118.255
11110.72.119.0/2510.72.119.1 – 10.72.119.12610.72.119.127
11210.72.119.128/2510.72.119.129 – 10.72.119.25410.72.119.255
11310.72.120.0/2510.72.120.1 – 10.72.120.12610.72.120.127
11410.72.120.128/2510.72.120.129 – 10.72.120.25410.72.120.255
11510.72.121.0/2510.72.121.1 – 10.72.121.12610.72.121.127
11610.72.121.128/2510.72.121.129 – 10.72.121.25410.72.121.255
11710.72.122.0/2510.72.122.1 – 10.72.122.12610.72.122.127
11810.72.122.128/2510.72.122.129 – 10.72.122.25410.72.122.255
11910.72.123.0/2510.72.123.1 – 10.72.123.12610.72.123.127
12010.72.123.128/2510.72.123.129 – 10.72.123.25410.72.123.255
12110.72.124.0/2510.72.124.1 – 10.72.124.12610.72.124.127
12210.72.124.128/2510.72.124.129 – 10.72.124.25410.72.124.255
12310.72.125.0/2510.72.125.1 – 10.72.125.12610.72.125.127
12410.72.125.128/2510.72.125.129 – 10.72.125.25410.72.125.255
12510.72.126.0/2510.72.126.1 – 10.72.126.12610.72.126.127
12610.72.126.128/2510.72.126.129 – 10.72.126.25410.72.126.255
12710.72.127.0/2510.72.127.1 – 10.72.127.12610.72.127.127
12810.72.127.128/2510.72.127.129 – 10.72.127.25410.72.127.255
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 →