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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)10.231.64.0/18
network10.231.64.0/18
broadcast10.231.127.255
first host10.231.64.1
last host10.231.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.231.64.0/18
address00001010.11100111.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.11100111.01000000.00000000
broadcast00001010.11100111.01111111.11111111
green = network part, grey = host part
hex0x0ae74000
decimal182927360
reverse dns0.64.231.10.in-addr.arpa
ipv4-mapped::ffff:ae7:4000

/18 split into /23 · 32 subnets

close ×
#networkhost rangebroadcast
110.231.64.0/2310.231.64.1 – 10.231.65.25410.231.65.255
210.231.66.0/2310.231.66.1 – 10.231.67.25410.231.67.255
310.231.68.0/2310.231.68.1 – 10.231.69.25410.231.69.255
410.231.70.0/2310.231.70.1 – 10.231.71.25410.231.71.255
510.231.72.0/2310.231.72.1 – 10.231.73.25410.231.73.255
610.231.74.0/2310.231.74.1 – 10.231.75.25410.231.75.255
710.231.76.0/2310.231.76.1 – 10.231.77.25410.231.77.255
810.231.78.0/2310.231.78.1 – 10.231.79.25410.231.79.255
910.231.80.0/2310.231.80.1 – 10.231.81.25410.231.81.255
1010.231.82.0/2310.231.82.1 – 10.231.83.25410.231.83.255
1110.231.84.0/2310.231.84.1 – 10.231.85.25410.231.85.255
1210.231.86.0/2310.231.86.1 – 10.231.87.25410.231.87.255
1310.231.88.0/2310.231.88.1 – 10.231.89.25410.231.89.255
1410.231.90.0/2310.231.90.1 – 10.231.91.25410.231.91.255
1510.231.92.0/2310.231.92.1 – 10.231.93.25410.231.93.255
1610.231.94.0/2310.231.94.1 – 10.231.95.25410.231.95.255
1710.231.96.0/2310.231.96.1 – 10.231.97.25410.231.97.255
1810.231.98.0/2310.231.98.1 – 10.231.99.25410.231.99.255
1910.231.100.0/2310.231.100.1 – 10.231.101.25410.231.101.255
2010.231.102.0/2310.231.102.1 – 10.231.103.25410.231.103.255
2110.231.104.0/2310.231.104.1 – 10.231.105.25410.231.105.255
2210.231.106.0/2310.231.106.1 – 10.231.107.25410.231.107.255
2310.231.108.0/2310.231.108.1 – 10.231.109.25410.231.109.255
2410.231.110.0/2310.231.110.1 – 10.231.111.25410.231.111.255
2510.231.112.0/2310.231.112.1 – 10.231.113.25410.231.113.255
2610.231.114.0/2310.231.114.1 – 10.231.115.25410.231.115.255
2710.231.116.0/2310.231.116.1 – 10.231.117.25410.231.117.255
2810.231.118.0/2310.231.118.1 – 10.231.119.25410.231.119.255
2910.231.120.0/2310.231.120.1 – 10.231.121.25410.231.121.255
3010.231.122.0/2310.231.122.1 – 10.231.123.25410.231.123.255
3110.231.124.0/2310.231.124.1 – 10.231.125.25410.231.125.255
3210.231.126.0/2310.231.126.1 – 10.231.127.25410.231.127.255
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 →