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
private IP (RFC 1918)10.131.64.0/18
network10.131.64.0/18
broadcast10.131.127.255
first host10.131.64.1
last host10.131.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.131.64.0/18
address00001010.10000011.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.10000011.01000000.00000000
broadcast00001010.10000011.01111111.11111111
green = network part, grey = host part
hex0x0a834000
decimal176373760
reverse dns0.64.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:4000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.131.64.0/2510.131.64.1 – 10.131.64.12610.131.64.127
210.131.64.128/2510.131.64.129 – 10.131.64.25410.131.64.255
310.131.65.0/2510.131.65.1 – 10.131.65.12610.131.65.127
410.131.65.128/2510.131.65.129 – 10.131.65.25410.131.65.255
510.131.66.0/2510.131.66.1 – 10.131.66.12610.131.66.127
610.131.66.128/2510.131.66.129 – 10.131.66.25410.131.66.255
710.131.67.0/2510.131.67.1 – 10.131.67.12610.131.67.127
810.131.67.128/2510.131.67.129 – 10.131.67.25410.131.67.255
910.131.68.0/2510.131.68.1 – 10.131.68.12610.131.68.127
1010.131.68.128/2510.131.68.129 – 10.131.68.25410.131.68.255
1110.131.69.0/2510.131.69.1 – 10.131.69.12610.131.69.127
1210.131.69.128/2510.131.69.129 – 10.131.69.25410.131.69.255
1310.131.70.0/2510.131.70.1 – 10.131.70.12610.131.70.127
1410.131.70.128/2510.131.70.129 – 10.131.70.25410.131.70.255
1510.131.71.0/2510.131.71.1 – 10.131.71.12610.131.71.127
1610.131.71.128/2510.131.71.129 – 10.131.71.25410.131.71.255
1710.131.72.0/2510.131.72.1 – 10.131.72.12610.131.72.127
1810.131.72.128/2510.131.72.129 – 10.131.72.25410.131.72.255
1910.131.73.0/2510.131.73.1 – 10.131.73.12610.131.73.127
2010.131.73.128/2510.131.73.129 – 10.131.73.25410.131.73.255
2110.131.74.0/2510.131.74.1 – 10.131.74.12610.131.74.127
2210.131.74.128/2510.131.74.129 – 10.131.74.25410.131.74.255
2310.131.75.0/2510.131.75.1 – 10.131.75.12610.131.75.127
2410.131.75.128/2510.131.75.129 – 10.131.75.25410.131.75.255
2510.131.76.0/2510.131.76.1 – 10.131.76.12610.131.76.127
2610.131.76.128/2510.131.76.129 – 10.131.76.25410.131.76.255
2710.131.77.0/2510.131.77.1 – 10.131.77.12610.131.77.127
2810.131.77.128/2510.131.77.129 – 10.131.77.25410.131.77.255
2910.131.78.0/2510.131.78.1 – 10.131.78.12610.131.78.127
3010.131.78.128/2510.131.78.129 – 10.131.78.25410.131.78.255
3110.131.79.0/2510.131.79.1 – 10.131.79.12610.131.79.127
3210.131.79.128/2510.131.79.129 – 10.131.79.25410.131.79.255
3310.131.80.0/2510.131.80.1 – 10.131.80.12610.131.80.127
3410.131.80.128/2510.131.80.129 – 10.131.80.25410.131.80.255
3510.131.81.0/2510.131.81.1 – 10.131.81.12610.131.81.127
3610.131.81.128/2510.131.81.129 – 10.131.81.25410.131.81.255
3710.131.82.0/2510.131.82.1 – 10.131.82.12610.131.82.127
3810.131.82.128/2510.131.82.129 – 10.131.82.25410.131.82.255
3910.131.83.0/2510.131.83.1 – 10.131.83.12610.131.83.127
4010.131.83.128/2510.131.83.129 – 10.131.83.25410.131.83.255
4110.131.84.0/2510.131.84.1 – 10.131.84.12610.131.84.127
4210.131.84.128/2510.131.84.129 – 10.131.84.25410.131.84.255
4310.131.85.0/2510.131.85.1 – 10.131.85.12610.131.85.127
4410.131.85.128/2510.131.85.129 – 10.131.85.25410.131.85.255
4510.131.86.0/2510.131.86.1 – 10.131.86.12610.131.86.127
4610.131.86.128/2510.131.86.129 – 10.131.86.25410.131.86.255
4710.131.87.0/2510.131.87.1 – 10.131.87.12610.131.87.127
4810.131.87.128/2510.131.87.129 – 10.131.87.25410.131.87.255
4910.131.88.0/2510.131.88.1 – 10.131.88.12610.131.88.127
5010.131.88.128/2510.131.88.129 – 10.131.88.25410.131.88.255
5110.131.89.0/2510.131.89.1 – 10.131.89.12610.131.89.127
5210.131.89.128/2510.131.89.129 – 10.131.89.25410.131.89.255
5310.131.90.0/2510.131.90.1 – 10.131.90.12610.131.90.127
5410.131.90.128/2510.131.90.129 – 10.131.90.25410.131.90.255
5510.131.91.0/2510.131.91.1 – 10.131.91.12610.131.91.127
5610.131.91.128/2510.131.91.129 – 10.131.91.25410.131.91.255
5710.131.92.0/2510.131.92.1 – 10.131.92.12610.131.92.127
5810.131.92.128/2510.131.92.129 – 10.131.92.25410.131.92.255
5910.131.93.0/2510.131.93.1 – 10.131.93.12610.131.93.127
6010.131.93.128/2510.131.93.129 – 10.131.93.25410.131.93.255
6110.131.94.0/2510.131.94.1 – 10.131.94.12610.131.94.127
6210.131.94.128/2510.131.94.129 – 10.131.94.25410.131.94.255
6310.131.95.0/2510.131.95.1 – 10.131.95.12610.131.95.127
6410.131.95.128/2510.131.95.129 – 10.131.95.25410.131.95.255
6510.131.96.0/2510.131.96.1 – 10.131.96.12610.131.96.127
6610.131.96.128/2510.131.96.129 – 10.131.96.25410.131.96.255
6710.131.97.0/2510.131.97.1 – 10.131.97.12610.131.97.127
6810.131.97.128/2510.131.97.129 – 10.131.97.25410.131.97.255
6910.131.98.0/2510.131.98.1 – 10.131.98.12610.131.98.127
7010.131.98.128/2510.131.98.129 – 10.131.98.25410.131.98.255
7110.131.99.0/2510.131.99.1 – 10.131.99.12610.131.99.127
7210.131.99.128/2510.131.99.129 – 10.131.99.25410.131.99.255
7310.131.100.0/2510.131.100.1 – 10.131.100.12610.131.100.127
7410.131.100.128/2510.131.100.129 – 10.131.100.25410.131.100.255
7510.131.101.0/2510.131.101.1 – 10.131.101.12610.131.101.127
7610.131.101.128/2510.131.101.129 – 10.131.101.25410.131.101.255
7710.131.102.0/2510.131.102.1 – 10.131.102.12610.131.102.127
7810.131.102.128/2510.131.102.129 – 10.131.102.25410.131.102.255
7910.131.103.0/2510.131.103.1 – 10.131.103.12610.131.103.127
8010.131.103.128/2510.131.103.129 – 10.131.103.25410.131.103.255
8110.131.104.0/2510.131.104.1 – 10.131.104.12610.131.104.127
8210.131.104.128/2510.131.104.129 – 10.131.104.25410.131.104.255
8310.131.105.0/2510.131.105.1 – 10.131.105.12610.131.105.127
8410.131.105.128/2510.131.105.129 – 10.131.105.25410.131.105.255
8510.131.106.0/2510.131.106.1 – 10.131.106.12610.131.106.127
8610.131.106.128/2510.131.106.129 – 10.131.106.25410.131.106.255
8710.131.107.0/2510.131.107.1 – 10.131.107.12610.131.107.127
8810.131.107.128/2510.131.107.129 – 10.131.107.25410.131.107.255
8910.131.108.0/2510.131.108.1 – 10.131.108.12610.131.108.127
9010.131.108.128/2510.131.108.129 – 10.131.108.25410.131.108.255
9110.131.109.0/2510.131.109.1 – 10.131.109.12610.131.109.127
9210.131.109.128/2510.131.109.129 – 10.131.109.25410.131.109.255
9310.131.110.0/2510.131.110.1 – 10.131.110.12610.131.110.127
9410.131.110.128/2510.131.110.129 – 10.131.110.25410.131.110.255
9510.131.111.0/2510.131.111.1 – 10.131.111.12610.131.111.127
9610.131.111.128/2510.131.111.129 – 10.131.111.25410.131.111.255
9710.131.112.0/2510.131.112.1 – 10.131.112.12610.131.112.127
9810.131.112.128/2510.131.112.129 – 10.131.112.25410.131.112.255
9910.131.113.0/2510.131.113.1 – 10.131.113.12610.131.113.127
10010.131.113.128/2510.131.113.129 – 10.131.113.25410.131.113.255
10110.131.114.0/2510.131.114.1 – 10.131.114.12610.131.114.127
10210.131.114.128/2510.131.114.129 – 10.131.114.25410.131.114.255
10310.131.115.0/2510.131.115.1 – 10.131.115.12610.131.115.127
10410.131.115.128/2510.131.115.129 – 10.131.115.25410.131.115.255
10510.131.116.0/2510.131.116.1 – 10.131.116.12610.131.116.127
10610.131.116.128/2510.131.116.129 – 10.131.116.25410.131.116.255
10710.131.117.0/2510.131.117.1 – 10.131.117.12610.131.117.127
10810.131.117.128/2510.131.117.129 – 10.131.117.25410.131.117.255
10910.131.118.0/2510.131.118.1 – 10.131.118.12610.131.118.127
11010.131.118.128/2510.131.118.129 – 10.131.118.25410.131.118.255
11110.131.119.0/2510.131.119.1 – 10.131.119.12610.131.119.127
11210.131.119.128/2510.131.119.129 – 10.131.119.25410.131.119.255
11310.131.120.0/2510.131.120.1 – 10.131.120.12610.131.120.127
11410.131.120.128/2510.131.120.129 – 10.131.120.25410.131.120.255
11510.131.121.0/2510.131.121.1 – 10.131.121.12610.131.121.127
11610.131.121.128/2510.131.121.129 – 10.131.121.25410.131.121.255
11710.131.122.0/2510.131.122.1 – 10.131.122.12610.131.122.127
11810.131.122.128/2510.131.122.129 – 10.131.122.25410.131.122.255
11910.131.123.0/2510.131.123.1 – 10.131.123.12610.131.123.127
12010.131.123.128/2510.131.123.129 – 10.131.123.25410.131.123.255
12110.131.124.0/2510.131.124.1 – 10.131.124.12610.131.124.127
12210.131.124.128/2510.131.124.129 – 10.131.124.25410.131.124.255
12310.131.125.0/2510.131.125.1 – 10.131.125.12610.131.125.127
12410.131.125.128/2510.131.125.129 – 10.131.125.25410.131.125.255
12510.131.126.0/2510.131.126.1 – 10.131.126.12610.131.126.127
12610.131.126.128/2510.131.126.129 – 10.131.126.25410.131.126.255
12710.131.127.0/2510.131.127.1 – 10.131.127.12610.131.127.127
12810.131.127.128/2510.131.127.129 – 10.131.127.25410.131.127.255
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 →