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)10.42.64.0/18
network10.42.64.0/18
broadcast10.42.127.255
first host10.42.64.1
last host10.42.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.42.64.0/18
address00001010.00101010.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00101010.01000000.00000000
broadcast00001010.00101010.01111111.11111111
green = network part, grey = host part
hex0x0a2a4000
decimal170541056
reverse dns0.64.42.10.in-addr.arpa
ipv4-mapped::ffff:a2a:4000

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.42.64.0/2510.42.64.1 – 10.42.64.12610.42.64.127
210.42.64.128/2510.42.64.129 – 10.42.64.25410.42.64.255
310.42.65.0/2510.42.65.1 – 10.42.65.12610.42.65.127
410.42.65.128/2510.42.65.129 – 10.42.65.25410.42.65.255
510.42.66.0/2510.42.66.1 – 10.42.66.12610.42.66.127
610.42.66.128/2510.42.66.129 – 10.42.66.25410.42.66.255
710.42.67.0/2510.42.67.1 – 10.42.67.12610.42.67.127
810.42.67.128/2510.42.67.129 – 10.42.67.25410.42.67.255
910.42.68.0/2510.42.68.1 – 10.42.68.12610.42.68.127
1010.42.68.128/2510.42.68.129 – 10.42.68.25410.42.68.255
1110.42.69.0/2510.42.69.1 – 10.42.69.12610.42.69.127
1210.42.69.128/2510.42.69.129 – 10.42.69.25410.42.69.255
1310.42.70.0/2510.42.70.1 – 10.42.70.12610.42.70.127
1410.42.70.128/2510.42.70.129 – 10.42.70.25410.42.70.255
1510.42.71.0/2510.42.71.1 – 10.42.71.12610.42.71.127
1610.42.71.128/2510.42.71.129 – 10.42.71.25410.42.71.255
1710.42.72.0/2510.42.72.1 – 10.42.72.12610.42.72.127
1810.42.72.128/2510.42.72.129 – 10.42.72.25410.42.72.255
1910.42.73.0/2510.42.73.1 – 10.42.73.12610.42.73.127
2010.42.73.128/2510.42.73.129 – 10.42.73.25410.42.73.255
2110.42.74.0/2510.42.74.1 – 10.42.74.12610.42.74.127
2210.42.74.128/2510.42.74.129 – 10.42.74.25410.42.74.255
2310.42.75.0/2510.42.75.1 – 10.42.75.12610.42.75.127
2410.42.75.128/2510.42.75.129 – 10.42.75.25410.42.75.255
2510.42.76.0/2510.42.76.1 – 10.42.76.12610.42.76.127
2610.42.76.128/2510.42.76.129 – 10.42.76.25410.42.76.255
2710.42.77.0/2510.42.77.1 – 10.42.77.12610.42.77.127
2810.42.77.128/2510.42.77.129 – 10.42.77.25410.42.77.255
2910.42.78.0/2510.42.78.1 – 10.42.78.12610.42.78.127
3010.42.78.128/2510.42.78.129 – 10.42.78.25410.42.78.255
3110.42.79.0/2510.42.79.1 – 10.42.79.12610.42.79.127
3210.42.79.128/2510.42.79.129 – 10.42.79.25410.42.79.255
3310.42.80.0/2510.42.80.1 – 10.42.80.12610.42.80.127
3410.42.80.128/2510.42.80.129 – 10.42.80.25410.42.80.255
3510.42.81.0/2510.42.81.1 – 10.42.81.12610.42.81.127
3610.42.81.128/2510.42.81.129 – 10.42.81.25410.42.81.255
3710.42.82.0/2510.42.82.1 – 10.42.82.12610.42.82.127
3810.42.82.128/2510.42.82.129 – 10.42.82.25410.42.82.255
3910.42.83.0/2510.42.83.1 – 10.42.83.12610.42.83.127
4010.42.83.128/2510.42.83.129 – 10.42.83.25410.42.83.255
4110.42.84.0/2510.42.84.1 – 10.42.84.12610.42.84.127
4210.42.84.128/2510.42.84.129 – 10.42.84.25410.42.84.255
4310.42.85.0/2510.42.85.1 – 10.42.85.12610.42.85.127
4410.42.85.128/2510.42.85.129 – 10.42.85.25410.42.85.255
4510.42.86.0/2510.42.86.1 – 10.42.86.12610.42.86.127
4610.42.86.128/2510.42.86.129 – 10.42.86.25410.42.86.255
4710.42.87.0/2510.42.87.1 – 10.42.87.12610.42.87.127
4810.42.87.128/2510.42.87.129 – 10.42.87.25410.42.87.255
4910.42.88.0/2510.42.88.1 – 10.42.88.12610.42.88.127
5010.42.88.128/2510.42.88.129 – 10.42.88.25410.42.88.255
5110.42.89.0/2510.42.89.1 – 10.42.89.12610.42.89.127
5210.42.89.128/2510.42.89.129 – 10.42.89.25410.42.89.255
5310.42.90.0/2510.42.90.1 – 10.42.90.12610.42.90.127
5410.42.90.128/2510.42.90.129 – 10.42.90.25410.42.90.255
5510.42.91.0/2510.42.91.1 – 10.42.91.12610.42.91.127
5610.42.91.128/2510.42.91.129 – 10.42.91.25410.42.91.255
5710.42.92.0/2510.42.92.1 – 10.42.92.12610.42.92.127
5810.42.92.128/2510.42.92.129 – 10.42.92.25410.42.92.255
5910.42.93.0/2510.42.93.1 – 10.42.93.12610.42.93.127
6010.42.93.128/2510.42.93.129 – 10.42.93.25410.42.93.255
6110.42.94.0/2510.42.94.1 – 10.42.94.12610.42.94.127
6210.42.94.128/2510.42.94.129 – 10.42.94.25410.42.94.255
6310.42.95.0/2510.42.95.1 – 10.42.95.12610.42.95.127
6410.42.95.128/2510.42.95.129 – 10.42.95.25410.42.95.255
6510.42.96.0/2510.42.96.1 – 10.42.96.12610.42.96.127
6610.42.96.128/2510.42.96.129 – 10.42.96.25410.42.96.255
6710.42.97.0/2510.42.97.1 – 10.42.97.12610.42.97.127
6810.42.97.128/2510.42.97.129 – 10.42.97.25410.42.97.255
6910.42.98.0/2510.42.98.1 – 10.42.98.12610.42.98.127
7010.42.98.128/2510.42.98.129 – 10.42.98.25410.42.98.255
7110.42.99.0/2510.42.99.1 – 10.42.99.12610.42.99.127
7210.42.99.128/2510.42.99.129 – 10.42.99.25410.42.99.255
7310.42.100.0/2510.42.100.1 – 10.42.100.12610.42.100.127
7410.42.100.128/2510.42.100.129 – 10.42.100.25410.42.100.255
7510.42.101.0/2510.42.101.1 – 10.42.101.12610.42.101.127
7610.42.101.128/2510.42.101.129 – 10.42.101.25410.42.101.255
7710.42.102.0/2510.42.102.1 – 10.42.102.12610.42.102.127
7810.42.102.128/2510.42.102.129 – 10.42.102.25410.42.102.255
7910.42.103.0/2510.42.103.1 – 10.42.103.12610.42.103.127
8010.42.103.128/2510.42.103.129 – 10.42.103.25410.42.103.255
8110.42.104.0/2510.42.104.1 – 10.42.104.12610.42.104.127
8210.42.104.128/2510.42.104.129 – 10.42.104.25410.42.104.255
8310.42.105.0/2510.42.105.1 – 10.42.105.12610.42.105.127
8410.42.105.128/2510.42.105.129 – 10.42.105.25410.42.105.255
8510.42.106.0/2510.42.106.1 – 10.42.106.12610.42.106.127
8610.42.106.128/2510.42.106.129 – 10.42.106.25410.42.106.255
8710.42.107.0/2510.42.107.1 – 10.42.107.12610.42.107.127
8810.42.107.128/2510.42.107.129 – 10.42.107.25410.42.107.255
8910.42.108.0/2510.42.108.1 – 10.42.108.12610.42.108.127
9010.42.108.128/2510.42.108.129 – 10.42.108.25410.42.108.255
9110.42.109.0/2510.42.109.1 – 10.42.109.12610.42.109.127
9210.42.109.128/2510.42.109.129 – 10.42.109.25410.42.109.255
9310.42.110.0/2510.42.110.1 – 10.42.110.12610.42.110.127
9410.42.110.128/2510.42.110.129 – 10.42.110.25410.42.110.255
9510.42.111.0/2510.42.111.1 – 10.42.111.12610.42.111.127
9610.42.111.128/2510.42.111.129 – 10.42.111.25410.42.111.255
9710.42.112.0/2510.42.112.1 – 10.42.112.12610.42.112.127
9810.42.112.128/2510.42.112.129 – 10.42.112.25410.42.112.255
9910.42.113.0/2510.42.113.1 – 10.42.113.12610.42.113.127
10010.42.113.128/2510.42.113.129 – 10.42.113.25410.42.113.255
10110.42.114.0/2510.42.114.1 – 10.42.114.12610.42.114.127
10210.42.114.128/2510.42.114.129 – 10.42.114.25410.42.114.255
10310.42.115.0/2510.42.115.1 – 10.42.115.12610.42.115.127
10410.42.115.128/2510.42.115.129 – 10.42.115.25410.42.115.255
10510.42.116.0/2510.42.116.1 – 10.42.116.12610.42.116.127
10610.42.116.128/2510.42.116.129 – 10.42.116.25410.42.116.255
10710.42.117.0/2510.42.117.1 – 10.42.117.12610.42.117.127
10810.42.117.128/2510.42.117.129 – 10.42.117.25410.42.117.255
10910.42.118.0/2510.42.118.1 – 10.42.118.12610.42.118.127
11010.42.118.128/2510.42.118.129 – 10.42.118.25410.42.118.255
11110.42.119.0/2510.42.119.1 – 10.42.119.12610.42.119.127
11210.42.119.128/2510.42.119.129 – 10.42.119.25410.42.119.255
11310.42.120.0/2510.42.120.1 – 10.42.120.12610.42.120.127
11410.42.120.128/2510.42.120.129 – 10.42.120.25410.42.120.255
11510.42.121.0/2510.42.121.1 – 10.42.121.12610.42.121.127
11610.42.121.128/2510.42.121.129 – 10.42.121.25410.42.121.255
11710.42.122.0/2510.42.122.1 – 10.42.122.12610.42.122.127
11810.42.122.128/2510.42.122.129 – 10.42.122.25410.42.122.255
11910.42.123.0/2510.42.123.1 – 10.42.123.12610.42.123.127
12010.42.123.128/2510.42.123.129 – 10.42.123.25410.42.123.255
12110.42.124.0/2510.42.124.1 – 10.42.124.12610.42.124.127
12210.42.124.128/2510.42.124.129 – 10.42.124.25410.42.124.255
12310.42.125.0/2510.42.125.1 – 10.42.125.12610.42.125.127
12410.42.125.128/2510.42.125.129 – 10.42.125.25410.42.125.255
12510.42.126.0/2510.42.126.1 – 10.42.126.12610.42.126.127
12610.42.126.128/2510.42.126.129 – 10.42.126.25410.42.126.255
12710.42.127.0/2510.42.127.1 – 10.42.127.12610.42.127.127
12810.42.127.128/2510.42.127.129 – 10.42.127.25410.42.127.255
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 →