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)10.3.64.0/18
network10.3.64.0/18
broadcast10.3.127.255
first host10.3.64.1
last host10.3.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.3.64.0/18
address00001010.00000011.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000011.01000000.00000000
broadcast00001010.00000011.01111111.11111111
green = network part, grey = host part
hex0x0a034000
decimal167985152
reverse dns0.64.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.64.0/2510.3.64.1 – 10.3.64.12610.3.64.127
210.3.64.128/2510.3.64.129 – 10.3.64.25410.3.64.255
310.3.65.0/2510.3.65.1 – 10.3.65.12610.3.65.127
410.3.65.128/2510.3.65.129 – 10.3.65.25410.3.65.255
510.3.66.0/2510.3.66.1 – 10.3.66.12610.3.66.127
610.3.66.128/2510.3.66.129 – 10.3.66.25410.3.66.255
710.3.67.0/2510.3.67.1 – 10.3.67.12610.3.67.127
810.3.67.128/2510.3.67.129 – 10.3.67.25410.3.67.255
910.3.68.0/2510.3.68.1 – 10.3.68.12610.3.68.127
1010.3.68.128/2510.3.68.129 – 10.3.68.25410.3.68.255
1110.3.69.0/2510.3.69.1 – 10.3.69.12610.3.69.127
1210.3.69.128/2510.3.69.129 – 10.3.69.25410.3.69.255
1310.3.70.0/2510.3.70.1 – 10.3.70.12610.3.70.127
1410.3.70.128/2510.3.70.129 – 10.3.70.25410.3.70.255
1510.3.71.0/2510.3.71.1 – 10.3.71.12610.3.71.127
1610.3.71.128/2510.3.71.129 – 10.3.71.25410.3.71.255
1710.3.72.0/2510.3.72.1 – 10.3.72.12610.3.72.127
1810.3.72.128/2510.3.72.129 – 10.3.72.25410.3.72.255
1910.3.73.0/2510.3.73.1 – 10.3.73.12610.3.73.127
2010.3.73.128/2510.3.73.129 – 10.3.73.25410.3.73.255
2110.3.74.0/2510.3.74.1 – 10.3.74.12610.3.74.127
2210.3.74.128/2510.3.74.129 – 10.3.74.25410.3.74.255
2310.3.75.0/2510.3.75.1 – 10.3.75.12610.3.75.127
2410.3.75.128/2510.3.75.129 – 10.3.75.25410.3.75.255
2510.3.76.0/2510.3.76.1 – 10.3.76.12610.3.76.127
2610.3.76.128/2510.3.76.129 – 10.3.76.25410.3.76.255
2710.3.77.0/2510.3.77.1 – 10.3.77.12610.3.77.127
2810.3.77.128/2510.3.77.129 – 10.3.77.25410.3.77.255
2910.3.78.0/2510.3.78.1 – 10.3.78.12610.3.78.127
3010.3.78.128/2510.3.78.129 – 10.3.78.25410.3.78.255
3110.3.79.0/2510.3.79.1 – 10.3.79.12610.3.79.127
3210.3.79.128/2510.3.79.129 – 10.3.79.25410.3.79.255
3310.3.80.0/2510.3.80.1 – 10.3.80.12610.3.80.127
3410.3.80.128/2510.3.80.129 – 10.3.80.25410.3.80.255
3510.3.81.0/2510.3.81.1 – 10.3.81.12610.3.81.127
3610.3.81.128/2510.3.81.129 – 10.3.81.25410.3.81.255
3710.3.82.0/2510.3.82.1 – 10.3.82.12610.3.82.127
3810.3.82.128/2510.3.82.129 – 10.3.82.25410.3.82.255
3910.3.83.0/2510.3.83.1 – 10.3.83.12610.3.83.127
4010.3.83.128/2510.3.83.129 – 10.3.83.25410.3.83.255
4110.3.84.0/2510.3.84.1 – 10.3.84.12610.3.84.127
4210.3.84.128/2510.3.84.129 – 10.3.84.25410.3.84.255
4310.3.85.0/2510.3.85.1 – 10.3.85.12610.3.85.127
4410.3.85.128/2510.3.85.129 – 10.3.85.25410.3.85.255
4510.3.86.0/2510.3.86.1 – 10.3.86.12610.3.86.127
4610.3.86.128/2510.3.86.129 – 10.3.86.25410.3.86.255
4710.3.87.0/2510.3.87.1 – 10.3.87.12610.3.87.127
4810.3.87.128/2510.3.87.129 – 10.3.87.25410.3.87.255
4910.3.88.0/2510.3.88.1 – 10.3.88.12610.3.88.127
5010.3.88.128/2510.3.88.129 – 10.3.88.25410.3.88.255
5110.3.89.0/2510.3.89.1 – 10.3.89.12610.3.89.127
5210.3.89.128/2510.3.89.129 – 10.3.89.25410.3.89.255
5310.3.90.0/2510.3.90.1 – 10.3.90.12610.3.90.127
5410.3.90.128/2510.3.90.129 – 10.3.90.25410.3.90.255
5510.3.91.0/2510.3.91.1 – 10.3.91.12610.3.91.127
5610.3.91.128/2510.3.91.129 – 10.3.91.25410.3.91.255
5710.3.92.0/2510.3.92.1 – 10.3.92.12610.3.92.127
5810.3.92.128/2510.3.92.129 – 10.3.92.25410.3.92.255
5910.3.93.0/2510.3.93.1 – 10.3.93.12610.3.93.127
6010.3.93.128/2510.3.93.129 – 10.3.93.25410.3.93.255
6110.3.94.0/2510.3.94.1 – 10.3.94.12610.3.94.127
6210.3.94.128/2510.3.94.129 – 10.3.94.25410.3.94.255
6310.3.95.0/2510.3.95.1 – 10.3.95.12610.3.95.127
6410.3.95.128/2510.3.95.129 – 10.3.95.25410.3.95.255
6510.3.96.0/2510.3.96.1 – 10.3.96.12610.3.96.127
6610.3.96.128/2510.3.96.129 – 10.3.96.25410.3.96.255
6710.3.97.0/2510.3.97.1 – 10.3.97.12610.3.97.127
6810.3.97.128/2510.3.97.129 – 10.3.97.25410.3.97.255
6910.3.98.0/2510.3.98.1 – 10.3.98.12610.3.98.127
7010.3.98.128/2510.3.98.129 – 10.3.98.25410.3.98.255
7110.3.99.0/2510.3.99.1 – 10.3.99.12610.3.99.127
7210.3.99.128/2510.3.99.129 – 10.3.99.25410.3.99.255
7310.3.100.0/2510.3.100.1 – 10.3.100.12610.3.100.127
7410.3.100.128/2510.3.100.129 – 10.3.100.25410.3.100.255
7510.3.101.0/2510.3.101.1 – 10.3.101.12610.3.101.127
7610.3.101.128/2510.3.101.129 – 10.3.101.25410.3.101.255
7710.3.102.0/2510.3.102.1 – 10.3.102.12610.3.102.127
7810.3.102.128/2510.3.102.129 – 10.3.102.25410.3.102.255
7910.3.103.0/2510.3.103.1 – 10.3.103.12610.3.103.127
8010.3.103.128/2510.3.103.129 – 10.3.103.25410.3.103.255
8110.3.104.0/2510.3.104.1 – 10.3.104.12610.3.104.127
8210.3.104.128/2510.3.104.129 – 10.3.104.25410.3.104.255
8310.3.105.0/2510.3.105.1 – 10.3.105.12610.3.105.127
8410.3.105.128/2510.3.105.129 – 10.3.105.25410.3.105.255
8510.3.106.0/2510.3.106.1 – 10.3.106.12610.3.106.127
8610.3.106.128/2510.3.106.129 – 10.3.106.25410.3.106.255
8710.3.107.0/2510.3.107.1 – 10.3.107.12610.3.107.127
8810.3.107.128/2510.3.107.129 – 10.3.107.25410.3.107.255
8910.3.108.0/2510.3.108.1 – 10.3.108.12610.3.108.127
9010.3.108.128/2510.3.108.129 – 10.3.108.25410.3.108.255
9110.3.109.0/2510.3.109.1 – 10.3.109.12610.3.109.127
9210.3.109.128/2510.3.109.129 – 10.3.109.25410.3.109.255
9310.3.110.0/2510.3.110.1 – 10.3.110.12610.3.110.127
9410.3.110.128/2510.3.110.129 – 10.3.110.25410.3.110.255
9510.3.111.0/2510.3.111.1 – 10.3.111.12610.3.111.127
9610.3.111.128/2510.3.111.129 – 10.3.111.25410.3.111.255
9710.3.112.0/2510.3.112.1 – 10.3.112.12610.3.112.127
9810.3.112.128/2510.3.112.129 – 10.3.112.25410.3.112.255
9910.3.113.0/2510.3.113.1 – 10.3.113.12610.3.113.127
10010.3.113.128/2510.3.113.129 – 10.3.113.25410.3.113.255
10110.3.114.0/2510.3.114.1 – 10.3.114.12610.3.114.127
10210.3.114.128/2510.3.114.129 – 10.3.114.25410.3.114.255
10310.3.115.0/2510.3.115.1 – 10.3.115.12610.3.115.127
10410.3.115.128/2510.3.115.129 – 10.3.115.25410.3.115.255
10510.3.116.0/2510.3.116.1 – 10.3.116.12610.3.116.127
10610.3.116.128/2510.3.116.129 – 10.3.116.25410.3.116.255
10710.3.117.0/2510.3.117.1 – 10.3.117.12610.3.117.127
10810.3.117.128/2510.3.117.129 – 10.3.117.25410.3.117.255
10910.3.118.0/2510.3.118.1 – 10.3.118.12610.3.118.127
11010.3.118.128/2510.3.118.129 – 10.3.118.25410.3.118.255
11110.3.119.0/2510.3.119.1 – 10.3.119.12610.3.119.127
11210.3.119.128/2510.3.119.129 – 10.3.119.25410.3.119.255
11310.3.120.0/2510.3.120.1 – 10.3.120.12610.3.120.127
11410.3.120.128/2510.3.120.129 – 10.3.120.25410.3.120.255
11510.3.121.0/2510.3.121.1 – 10.3.121.12610.3.121.127
11610.3.121.128/2510.3.121.129 – 10.3.121.25410.3.121.255
11710.3.122.0/2510.3.122.1 – 10.3.122.12610.3.122.127
11810.3.122.128/2510.3.122.129 – 10.3.122.25410.3.122.255
11910.3.123.0/2510.3.123.1 – 10.3.123.12610.3.123.127
12010.3.123.128/2510.3.123.129 – 10.3.123.25410.3.123.255
12110.3.124.0/2510.3.124.1 – 10.3.124.12610.3.124.127
12210.3.124.128/2510.3.124.129 – 10.3.124.25410.3.124.255
12310.3.125.0/2510.3.125.1 – 10.3.125.12610.3.125.127
12410.3.125.128/2510.3.125.129 – 10.3.125.25410.3.125.255
12510.3.126.0/2510.3.126.1 – 10.3.126.12610.3.126.127
12610.3.126.128/2510.3.126.129 – 10.3.126.25410.3.126.255
12710.3.127.0/2510.3.127.1 – 10.3.127.12610.3.127.127
12810.3.127.128/2510.3.127.129 – 10.3.127.25410.3.127.255
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 →