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)10.40.64.0/18
network10.40.64.0/18
broadcast10.40.127.255
first host10.40.64.1
last host10.40.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.40.64.0/18
address00001010.00101000.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00101000.01000000.00000000
broadcast00001010.00101000.01111111.11111111
green = network part, grey = host part
hex0x0a284000
decimal170409984
reverse dns0.64.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:4000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.40.64.0/2510.40.64.1 – 10.40.64.12610.40.64.127
210.40.64.128/2510.40.64.129 – 10.40.64.25410.40.64.255
310.40.65.0/2510.40.65.1 – 10.40.65.12610.40.65.127
410.40.65.128/2510.40.65.129 – 10.40.65.25410.40.65.255
510.40.66.0/2510.40.66.1 – 10.40.66.12610.40.66.127
610.40.66.128/2510.40.66.129 – 10.40.66.25410.40.66.255
710.40.67.0/2510.40.67.1 – 10.40.67.12610.40.67.127
810.40.67.128/2510.40.67.129 – 10.40.67.25410.40.67.255
910.40.68.0/2510.40.68.1 – 10.40.68.12610.40.68.127
1010.40.68.128/2510.40.68.129 – 10.40.68.25410.40.68.255
1110.40.69.0/2510.40.69.1 – 10.40.69.12610.40.69.127
1210.40.69.128/2510.40.69.129 – 10.40.69.25410.40.69.255
1310.40.70.0/2510.40.70.1 – 10.40.70.12610.40.70.127
1410.40.70.128/2510.40.70.129 – 10.40.70.25410.40.70.255
1510.40.71.0/2510.40.71.1 – 10.40.71.12610.40.71.127
1610.40.71.128/2510.40.71.129 – 10.40.71.25410.40.71.255
1710.40.72.0/2510.40.72.1 – 10.40.72.12610.40.72.127
1810.40.72.128/2510.40.72.129 – 10.40.72.25410.40.72.255
1910.40.73.0/2510.40.73.1 – 10.40.73.12610.40.73.127
2010.40.73.128/2510.40.73.129 – 10.40.73.25410.40.73.255
2110.40.74.0/2510.40.74.1 – 10.40.74.12610.40.74.127
2210.40.74.128/2510.40.74.129 – 10.40.74.25410.40.74.255
2310.40.75.0/2510.40.75.1 – 10.40.75.12610.40.75.127
2410.40.75.128/2510.40.75.129 – 10.40.75.25410.40.75.255
2510.40.76.0/2510.40.76.1 – 10.40.76.12610.40.76.127
2610.40.76.128/2510.40.76.129 – 10.40.76.25410.40.76.255
2710.40.77.0/2510.40.77.1 – 10.40.77.12610.40.77.127
2810.40.77.128/2510.40.77.129 – 10.40.77.25410.40.77.255
2910.40.78.0/2510.40.78.1 – 10.40.78.12610.40.78.127
3010.40.78.128/2510.40.78.129 – 10.40.78.25410.40.78.255
3110.40.79.0/2510.40.79.1 – 10.40.79.12610.40.79.127
3210.40.79.128/2510.40.79.129 – 10.40.79.25410.40.79.255
3310.40.80.0/2510.40.80.1 – 10.40.80.12610.40.80.127
3410.40.80.128/2510.40.80.129 – 10.40.80.25410.40.80.255
3510.40.81.0/2510.40.81.1 – 10.40.81.12610.40.81.127
3610.40.81.128/2510.40.81.129 – 10.40.81.25410.40.81.255
3710.40.82.0/2510.40.82.1 – 10.40.82.12610.40.82.127
3810.40.82.128/2510.40.82.129 – 10.40.82.25410.40.82.255
3910.40.83.0/2510.40.83.1 – 10.40.83.12610.40.83.127
4010.40.83.128/2510.40.83.129 – 10.40.83.25410.40.83.255
4110.40.84.0/2510.40.84.1 – 10.40.84.12610.40.84.127
4210.40.84.128/2510.40.84.129 – 10.40.84.25410.40.84.255
4310.40.85.0/2510.40.85.1 – 10.40.85.12610.40.85.127
4410.40.85.128/2510.40.85.129 – 10.40.85.25410.40.85.255
4510.40.86.0/2510.40.86.1 – 10.40.86.12610.40.86.127
4610.40.86.128/2510.40.86.129 – 10.40.86.25410.40.86.255
4710.40.87.0/2510.40.87.1 – 10.40.87.12610.40.87.127
4810.40.87.128/2510.40.87.129 – 10.40.87.25410.40.87.255
4910.40.88.0/2510.40.88.1 – 10.40.88.12610.40.88.127
5010.40.88.128/2510.40.88.129 – 10.40.88.25410.40.88.255
5110.40.89.0/2510.40.89.1 – 10.40.89.12610.40.89.127
5210.40.89.128/2510.40.89.129 – 10.40.89.25410.40.89.255
5310.40.90.0/2510.40.90.1 – 10.40.90.12610.40.90.127
5410.40.90.128/2510.40.90.129 – 10.40.90.25410.40.90.255
5510.40.91.0/2510.40.91.1 – 10.40.91.12610.40.91.127
5610.40.91.128/2510.40.91.129 – 10.40.91.25410.40.91.255
5710.40.92.0/2510.40.92.1 – 10.40.92.12610.40.92.127
5810.40.92.128/2510.40.92.129 – 10.40.92.25410.40.92.255
5910.40.93.0/2510.40.93.1 – 10.40.93.12610.40.93.127
6010.40.93.128/2510.40.93.129 – 10.40.93.25410.40.93.255
6110.40.94.0/2510.40.94.1 – 10.40.94.12610.40.94.127
6210.40.94.128/2510.40.94.129 – 10.40.94.25410.40.94.255
6310.40.95.0/2510.40.95.1 – 10.40.95.12610.40.95.127
6410.40.95.128/2510.40.95.129 – 10.40.95.25410.40.95.255
6510.40.96.0/2510.40.96.1 – 10.40.96.12610.40.96.127
6610.40.96.128/2510.40.96.129 – 10.40.96.25410.40.96.255
6710.40.97.0/2510.40.97.1 – 10.40.97.12610.40.97.127
6810.40.97.128/2510.40.97.129 – 10.40.97.25410.40.97.255
6910.40.98.0/2510.40.98.1 – 10.40.98.12610.40.98.127
7010.40.98.128/2510.40.98.129 – 10.40.98.25410.40.98.255
7110.40.99.0/2510.40.99.1 – 10.40.99.12610.40.99.127
7210.40.99.128/2510.40.99.129 – 10.40.99.25410.40.99.255
7310.40.100.0/2510.40.100.1 – 10.40.100.12610.40.100.127
7410.40.100.128/2510.40.100.129 – 10.40.100.25410.40.100.255
7510.40.101.0/2510.40.101.1 – 10.40.101.12610.40.101.127
7610.40.101.128/2510.40.101.129 – 10.40.101.25410.40.101.255
7710.40.102.0/2510.40.102.1 – 10.40.102.12610.40.102.127
7810.40.102.128/2510.40.102.129 – 10.40.102.25410.40.102.255
7910.40.103.0/2510.40.103.1 – 10.40.103.12610.40.103.127
8010.40.103.128/2510.40.103.129 – 10.40.103.25410.40.103.255
8110.40.104.0/2510.40.104.1 – 10.40.104.12610.40.104.127
8210.40.104.128/2510.40.104.129 – 10.40.104.25410.40.104.255
8310.40.105.0/2510.40.105.1 – 10.40.105.12610.40.105.127
8410.40.105.128/2510.40.105.129 – 10.40.105.25410.40.105.255
8510.40.106.0/2510.40.106.1 – 10.40.106.12610.40.106.127
8610.40.106.128/2510.40.106.129 – 10.40.106.25410.40.106.255
8710.40.107.0/2510.40.107.1 – 10.40.107.12610.40.107.127
8810.40.107.128/2510.40.107.129 – 10.40.107.25410.40.107.255
8910.40.108.0/2510.40.108.1 – 10.40.108.12610.40.108.127
9010.40.108.128/2510.40.108.129 – 10.40.108.25410.40.108.255
9110.40.109.0/2510.40.109.1 – 10.40.109.12610.40.109.127
9210.40.109.128/2510.40.109.129 – 10.40.109.25410.40.109.255
9310.40.110.0/2510.40.110.1 – 10.40.110.12610.40.110.127
9410.40.110.128/2510.40.110.129 – 10.40.110.25410.40.110.255
9510.40.111.0/2510.40.111.1 – 10.40.111.12610.40.111.127
9610.40.111.128/2510.40.111.129 – 10.40.111.25410.40.111.255
9710.40.112.0/2510.40.112.1 – 10.40.112.12610.40.112.127
9810.40.112.128/2510.40.112.129 – 10.40.112.25410.40.112.255
9910.40.113.0/2510.40.113.1 – 10.40.113.12610.40.113.127
10010.40.113.128/2510.40.113.129 – 10.40.113.25410.40.113.255
10110.40.114.0/2510.40.114.1 – 10.40.114.12610.40.114.127
10210.40.114.128/2510.40.114.129 – 10.40.114.25410.40.114.255
10310.40.115.0/2510.40.115.1 – 10.40.115.12610.40.115.127
10410.40.115.128/2510.40.115.129 – 10.40.115.25410.40.115.255
10510.40.116.0/2510.40.116.1 – 10.40.116.12610.40.116.127
10610.40.116.128/2510.40.116.129 – 10.40.116.25410.40.116.255
10710.40.117.0/2510.40.117.1 – 10.40.117.12610.40.117.127
10810.40.117.128/2510.40.117.129 – 10.40.117.25410.40.117.255
10910.40.118.0/2510.40.118.1 – 10.40.118.12610.40.118.127
11010.40.118.128/2510.40.118.129 – 10.40.118.25410.40.118.255
11110.40.119.0/2510.40.119.1 – 10.40.119.12610.40.119.127
11210.40.119.128/2510.40.119.129 – 10.40.119.25410.40.119.255
11310.40.120.0/2510.40.120.1 – 10.40.120.12610.40.120.127
11410.40.120.128/2510.40.120.129 – 10.40.120.25410.40.120.255
11510.40.121.0/2510.40.121.1 – 10.40.121.12610.40.121.127
11610.40.121.128/2510.40.121.129 – 10.40.121.25410.40.121.255
11710.40.122.0/2510.40.122.1 – 10.40.122.12610.40.122.127
11810.40.122.128/2510.40.122.129 – 10.40.122.25410.40.122.255
11910.40.123.0/2510.40.123.1 – 10.40.123.12610.40.123.127
12010.40.123.128/2510.40.123.129 – 10.40.123.25410.40.123.255
12110.40.124.0/2510.40.124.1 – 10.40.124.12610.40.124.127
12210.40.124.128/2510.40.124.129 – 10.40.124.25410.40.124.255
12310.40.125.0/2510.40.125.1 – 10.40.125.12610.40.125.127
12410.40.125.128/2510.40.125.129 – 10.40.125.25410.40.125.255
12510.40.126.0/2510.40.126.1 – 10.40.126.12610.40.126.127
12610.40.126.128/2510.40.126.129 – 10.40.126.25410.40.126.255
12710.40.127.0/2510.40.127.1 – 10.40.127.12610.40.127.127
12810.40.127.128/2510.40.127.129 – 10.40.127.25410.40.127.255
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 →