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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)10.158.64.0/18
network10.158.64.0/18
broadcast10.158.127.255
first host10.158.64.1
last host10.158.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.158.64.0/18
address00001010.10011110.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.10011110.01000000.00000000
broadcast00001010.10011110.01111111.11111111
green = network part, grey = host part
hex0x0a9e4000
decimal178143232
reverse dns0.64.158.10.in-addr.arpa
ipv4-mapped::ffff:a9e:4000

/18 split into /24 · 64 subnets

close ×
#networkhost rangebroadcast
110.158.64.0/2410.158.64.1 – 10.158.64.25410.158.64.255
210.158.65.0/2410.158.65.1 – 10.158.65.25410.158.65.255
310.158.66.0/2410.158.66.1 – 10.158.66.25410.158.66.255
410.158.67.0/2410.158.67.1 – 10.158.67.25410.158.67.255
510.158.68.0/2410.158.68.1 – 10.158.68.25410.158.68.255
610.158.69.0/2410.158.69.1 – 10.158.69.25410.158.69.255
710.158.70.0/2410.158.70.1 – 10.158.70.25410.158.70.255
810.158.71.0/2410.158.71.1 – 10.158.71.25410.158.71.255
910.158.72.0/2410.158.72.1 – 10.158.72.25410.158.72.255
1010.158.73.0/2410.158.73.1 – 10.158.73.25410.158.73.255
1110.158.74.0/2410.158.74.1 – 10.158.74.25410.158.74.255
1210.158.75.0/2410.158.75.1 – 10.158.75.25410.158.75.255
1310.158.76.0/2410.158.76.1 – 10.158.76.25410.158.76.255
1410.158.77.0/2410.158.77.1 – 10.158.77.25410.158.77.255
1510.158.78.0/2410.158.78.1 – 10.158.78.25410.158.78.255
1610.158.79.0/2410.158.79.1 – 10.158.79.25410.158.79.255
1710.158.80.0/2410.158.80.1 – 10.158.80.25410.158.80.255
1810.158.81.0/2410.158.81.1 – 10.158.81.25410.158.81.255
1910.158.82.0/2410.158.82.1 – 10.158.82.25410.158.82.255
2010.158.83.0/2410.158.83.1 – 10.158.83.25410.158.83.255
2110.158.84.0/2410.158.84.1 – 10.158.84.25410.158.84.255
2210.158.85.0/2410.158.85.1 – 10.158.85.25410.158.85.255
2310.158.86.0/2410.158.86.1 – 10.158.86.25410.158.86.255
2410.158.87.0/2410.158.87.1 – 10.158.87.25410.158.87.255
2510.158.88.0/2410.158.88.1 – 10.158.88.25410.158.88.255
2610.158.89.0/2410.158.89.1 – 10.158.89.25410.158.89.255
2710.158.90.0/2410.158.90.1 – 10.158.90.25410.158.90.255
2810.158.91.0/2410.158.91.1 – 10.158.91.25410.158.91.255
2910.158.92.0/2410.158.92.1 – 10.158.92.25410.158.92.255
3010.158.93.0/2410.158.93.1 – 10.158.93.25410.158.93.255
3110.158.94.0/2410.158.94.1 – 10.158.94.25410.158.94.255
3210.158.95.0/2410.158.95.1 – 10.158.95.25410.158.95.255
3310.158.96.0/2410.158.96.1 – 10.158.96.25410.158.96.255
3410.158.97.0/2410.158.97.1 – 10.158.97.25410.158.97.255
3510.158.98.0/2410.158.98.1 – 10.158.98.25410.158.98.255
3610.158.99.0/2410.158.99.1 – 10.158.99.25410.158.99.255
3710.158.100.0/2410.158.100.1 – 10.158.100.25410.158.100.255
3810.158.101.0/2410.158.101.1 – 10.158.101.25410.158.101.255
3910.158.102.0/2410.158.102.1 – 10.158.102.25410.158.102.255
4010.158.103.0/2410.158.103.1 – 10.158.103.25410.158.103.255
4110.158.104.0/2410.158.104.1 – 10.158.104.25410.158.104.255
4210.158.105.0/2410.158.105.1 – 10.158.105.25410.158.105.255
4310.158.106.0/2410.158.106.1 – 10.158.106.25410.158.106.255
4410.158.107.0/2410.158.107.1 – 10.158.107.25410.158.107.255
4510.158.108.0/2410.158.108.1 – 10.158.108.25410.158.108.255
4610.158.109.0/2410.158.109.1 – 10.158.109.25410.158.109.255
4710.158.110.0/2410.158.110.1 – 10.158.110.25410.158.110.255
4810.158.111.0/2410.158.111.1 – 10.158.111.25410.158.111.255
4910.158.112.0/2410.158.112.1 – 10.158.112.25410.158.112.255
5010.158.113.0/2410.158.113.1 – 10.158.113.25410.158.113.255
5110.158.114.0/2410.158.114.1 – 10.158.114.25410.158.114.255
5210.158.115.0/2410.158.115.1 – 10.158.115.25410.158.115.255
5310.158.116.0/2410.158.116.1 – 10.158.116.25410.158.116.255
5410.158.117.0/2410.158.117.1 – 10.158.117.25410.158.117.255
5510.158.118.0/2410.158.118.1 – 10.158.118.25410.158.118.255
5610.158.119.0/2410.158.119.1 – 10.158.119.25410.158.119.255
5710.158.120.0/2410.158.120.1 – 10.158.120.25410.158.120.255
5810.158.121.0/2410.158.121.1 – 10.158.121.25410.158.121.255
5910.158.122.0/2410.158.122.1 – 10.158.122.25410.158.122.255
6010.158.123.0/2410.158.123.1 – 10.158.123.25410.158.123.255
6110.158.124.0/2410.158.124.1 – 10.158.124.25410.158.124.255
6210.158.125.0/2410.158.125.1 – 10.158.125.25410.158.125.255
6310.158.126.0/2410.158.126.1 – 10.158.126.25410.158.126.255
6410.158.127.0/2410.158.127.1 – 10.158.127.25410.158.127.255
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 →