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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)10.166.64.0/18
network10.166.64.0/18
broadcast10.166.127.255
first host10.166.64.1
last host10.166.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.166.64.0/18
address00001010.10100110.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.10100110.01000000.00000000
broadcast00001010.10100110.01111111.11111111
green = network part, grey = host part
hex0x0aa64000
decimal178667520
reverse dns0.64.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:4000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.64.0/2410.166.64.1 – 10.166.64.25410.166.64.255
210.166.65.0/2410.166.65.1 – 10.166.65.25410.166.65.255
310.166.66.0/2410.166.66.1 – 10.166.66.25410.166.66.255
410.166.67.0/2410.166.67.1 – 10.166.67.25410.166.67.255
510.166.68.0/2410.166.68.1 – 10.166.68.25410.166.68.255
610.166.69.0/2410.166.69.1 – 10.166.69.25410.166.69.255
710.166.70.0/2410.166.70.1 – 10.166.70.25410.166.70.255
810.166.71.0/2410.166.71.1 – 10.166.71.25410.166.71.255
910.166.72.0/2410.166.72.1 – 10.166.72.25410.166.72.255
1010.166.73.0/2410.166.73.1 – 10.166.73.25410.166.73.255
1110.166.74.0/2410.166.74.1 – 10.166.74.25410.166.74.255
1210.166.75.0/2410.166.75.1 – 10.166.75.25410.166.75.255
1310.166.76.0/2410.166.76.1 – 10.166.76.25410.166.76.255
1410.166.77.0/2410.166.77.1 – 10.166.77.25410.166.77.255
1510.166.78.0/2410.166.78.1 – 10.166.78.25410.166.78.255
1610.166.79.0/2410.166.79.1 – 10.166.79.25410.166.79.255
1710.166.80.0/2410.166.80.1 – 10.166.80.25410.166.80.255
1810.166.81.0/2410.166.81.1 – 10.166.81.25410.166.81.255
1910.166.82.0/2410.166.82.1 – 10.166.82.25410.166.82.255
2010.166.83.0/2410.166.83.1 – 10.166.83.25410.166.83.255
2110.166.84.0/2410.166.84.1 – 10.166.84.25410.166.84.255
2210.166.85.0/2410.166.85.1 – 10.166.85.25410.166.85.255
2310.166.86.0/2410.166.86.1 – 10.166.86.25410.166.86.255
2410.166.87.0/2410.166.87.1 – 10.166.87.25410.166.87.255
2510.166.88.0/2410.166.88.1 – 10.166.88.25410.166.88.255
2610.166.89.0/2410.166.89.1 – 10.166.89.25410.166.89.255
2710.166.90.0/2410.166.90.1 – 10.166.90.25410.166.90.255
2810.166.91.0/2410.166.91.1 – 10.166.91.25410.166.91.255
2910.166.92.0/2410.166.92.1 – 10.166.92.25410.166.92.255
3010.166.93.0/2410.166.93.1 – 10.166.93.25410.166.93.255
3110.166.94.0/2410.166.94.1 – 10.166.94.25410.166.94.255
3210.166.95.0/2410.166.95.1 – 10.166.95.25410.166.95.255
3310.166.96.0/2410.166.96.1 – 10.166.96.25410.166.96.255
3410.166.97.0/2410.166.97.1 – 10.166.97.25410.166.97.255
3510.166.98.0/2410.166.98.1 – 10.166.98.25410.166.98.255
3610.166.99.0/2410.166.99.1 – 10.166.99.25410.166.99.255
3710.166.100.0/2410.166.100.1 – 10.166.100.25410.166.100.255
3810.166.101.0/2410.166.101.1 – 10.166.101.25410.166.101.255
3910.166.102.0/2410.166.102.1 – 10.166.102.25410.166.102.255
4010.166.103.0/2410.166.103.1 – 10.166.103.25410.166.103.255
4110.166.104.0/2410.166.104.1 – 10.166.104.25410.166.104.255
4210.166.105.0/2410.166.105.1 – 10.166.105.25410.166.105.255
4310.166.106.0/2410.166.106.1 – 10.166.106.25410.166.106.255
4410.166.107.0/2410.166.107.1 – 10.166.107.25410.166.107.255
4510.166.108.0/2410.166.108.1 – 10.166.108.25410.166.108.255
4610.166.109.0/2410.166.109.1 – 10.166.109.25410.166.109.255
4710.166.110.0/2410.166.110.1 – 10.166.110.25410.166.110.255
4810.166.111.0/2410.166.111.1 – 10.166.111.25410.166.111.255
4910.166.112.0/2410.166.112.1 – 10.166.112.25410.166.112.255
5010.166.113.0/2410.166.113.1 – 10.166.113.25410.166.113.255
5110.166.114.0/2410.166.114.1 – 10.166.114.25410.166.114.255
5210.166.115.0/2410.166.115.1 – 10.166.115.25410.166.115.255
5310.166.116.0/2410.166.116.1 – 10.166.116.25410.166.116.255
5410.166.117.0/2410.166.117.1 – 10.166.117.25410.166.117.255
5510.166.118.0/2410.166.118.1 – 10.166.118.25410.166.118.255
5610.166.119.0/2410.166.119.1 – 10.166.119.25410.166.119.255
5710.166.120.0/2410.166.120.1 – 10.166.120.25410.166.120.255
5810.166.121.0/2410.166.121.1 – 10.166.121.25410.166.121.255
5910.166.122.0/2410.166.122.1 – 10.166.122.25410.166.122.255
6010.166.123.0/2410.166.123.1 – 10.166.123.25410.166.123.255
6110.166.124.0/2410.166.124.1 – 10.166.124.25410.166.124.255
6210.166.125.0/2410.166.125.1 – 10.166.125.25410.166.125.255
6310.166.126.0/2410.166.126.1 – 10.166.126.25410.166.126.255
6410.166.127.0/2410.166.127.1 – 10.166.127.25410.166.127.255
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 →