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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)10.6.64.0/18
network10.6.64.0/18
broadcast10.6.127.255
first host10.6.64.1
last host10.6.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.6.64.0/18
address00001010.00000110.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000110.01000000.00000000
broadcast00001010.00000110.01111111.11111111
green = network part, grey = host part
hex0x0a064000
decimal168181760
reverse dns0.64.6.10.in-addr.arpa
ipv4-mapped::ffff:a06:4000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.6.64.0/2410.6.64.1 – 10.6.64.25410.6.64.255
210.6.65.0/2410.6.65.1 – 10.6.65.25410.6.65.255
310.6.66.0/2410.6.66.1 – 10.6.66.25410.6.66.255
410.6.67.0/2410.6.67.1 – 10.6.67.25410.6.67.255
510.6.68.0/2410.6.68.1 – 10.6.68.25410.6.68.255
610.6.69.0/2410.6.69.1 – 10.6.69.25410.6.69.255
710.6.70.0/2410.6.70.1 – 10.6.70.25410.6.70.255
810.6.71.0/2410.6.71.1 – 10.6.71.25410.6.71.255
910.6.72.0/2410.6.72.1 – 10.6.72.25410.6.72.255
1010.6.73.0/2410.6.73.1 – 10.6.73.25410.6.73.255
1110.6.74.0/2410.6.74.1 – 10.6.74.25410.6.74.255
1210.6.75.0/2410.6.75.1 – 10.6.75.25410.6.75.255
1310.6.76.0/2410.6.76.1 – 10.6.76.25410.6.76.255
1410.6.77.0/2410.6.77.1 – 10.6.77.25410.6.77.255
1510.6.78.0/2410.6.78.1 – 10.6.78.25410.6.78.255
1610.6.79.0/2410.6.79.1 – 10.6.79.25410.6.79.255
1710.6.80.0/2410.6.80.1 – 10.6.80.25410.6.80.255
1810.6.81.0/2410.6.81.1 – 10.6.81.25410.6.81.255
1910.6.82.0/2410.6.82.1 – 10.6.82.25410.6.82.255
2010.6.83.0/2410.6.83.1 – 10.6.83.25410.6.83.255
2110.6.84.0/2410.6.84.1 – 10.6.84.25410.6.84.255
2210.6.85.0/2410.6.85.1 – 10.6.85.25410.6.85.255
2310.6.86.0/2410.6.86.1 – 10.6.86.25410.6.86.255
2410.6.87.0/2410.6.87.1 – 10.6.87.25410.6.87.255
2510.6.88.0/2410.6.88.1 – 10.6.88.25410.6.88.255
2610.6.89.0/2410.6.89.1 – 10.6.89.25410.6.89.255
2710.6.90.0/2410.6.90.1 – 10.6.90.25410.6.90.255
2810.6.91.0/2410.6.91.1 – 10.6.91.25410.6.91.255
2910.6.92.0/2410.6.92.1 – 10.6.92.25410.6.92.255
3010.6.93.0/2410.6.93.1 – 10.6.93.25410.6.93.255
3110.6.94.0/2410.6.94.1 – 10.6.94.25410.6.94.255
3210.6.95.0/2410.6.95.1 – 10.6.95.25410.6.95.255
3310.6.96.0/2410.6.96.1 – 10.6.96.25410.6.96.255
3410.6.97.0/2410.6.97.1 – 10.6.97.25410.6.97.255
3510.6.98.0/2410.6.98.1 – 10.6.98.25410.6.98.255
3610.6.99.0/2410.6.99.1 – 10.6.99.25410.6.99.255
3710.6.100.0/2410.6.100.1 – 10.6.100.25410.6.100.255
3810.6.101.0/2410.6.101.1 – 10.6.101.25410.6.101.255
3910.6.102.0/2410.6.102.1 – 10.6.102.25410.6.102.255
4010.6.103.0/2410.6.103.1 – 10.6.103.25410.6.103.255
4110.6.104.0/2410.6.104.1 – 10.6.104.25410.6.104.255
4210.6.105.0/2410.6.105.1 – 10.6.105.25410.6.105.255
4310.6.106.0/2410.6.106.1 – 10.6.106.25410.6.106.255
4410.6.107.0/2410.6.107.1 – 10.6.107.25410.6.107.255
4510.6.108.0/2410.6.108.1 – 10.6.108.25410.6.108.255
4610.6.109.0/2410.6.109.1 – 10.6.109.25410.6.109.255
4710.6.110.0/2410.6.110.1 – 10.6.110.25410.6.110.255
4810.6.111.0/2410.6.111.1 – 10.6.111.25410.6.111.255
4910.6.112.0/2410.6.112.1 – 10.6.112.25410.6.112.255
5010.6.113.0/2410.6.113.1 – 10.6.113.25410.6.113.255
5110.6.114.0/2410.6.114.1 – 10.6.114.25410.6.114.255
5210.6.115.0/2410.6.115.1 – 10.6.115.25410.6.115.255
5310.6.116.0/2410.6.116.1 – 10.6.116.25410.6.116.255
5410.6.117.0/2410.6.117.1 – 10.6.117.25410.6.117.255
5510.6.118.0/2410.6.118.1 – 10.6.118.25410.6.118.255
5610.6.119.0/2410.6.119.1 – 10.6.119.25410.6.119.255
5710.6.120.0/2410.6.120.1 – 10.6.120.25410.6.120.255
5810.6.121.0/2410.6.121.1 – 10.6.121.25410.6.121.255
5910.6.122.0/2410.6.122.1 – 10.6.122.25410.6.122.255
6010.6.123.0/2410.6.123.1 – 10.6.123.25410.6.123.255
6110.6.124.0/2410.6.124.1 – 10.6.124.25410.6.124.255
6210.6.125.0/2410.6.125.1 – 10.6.125.25410.6.125.255
6310.6.126.0/2410.6.126.1 – 10.6.126.25410.6.126.255
6410.6.127.0/2410.6.127.1 – 10.6.127.25410.6.127.255
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 →