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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)10.0.64.0/18
network10.0.64.0/18
broadcast10.0.127.255
first host10.0.64.1
last host10.0.127.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.0.64.0/18
address00001010.00000000.01000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000000.01000000.00000000
broadcast00001010.00000000.01111111.11111111
green = network part, grey = host part
hex0x0a004000
decimal167788544
reverse dns0.64.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:4000

/18 split into /23 · 32 subnets

close ×
#networkhost rangebroadcast
110.0.64.0/2310.0.64.1 – 10.0.65.25410.0.65.255
210.0.66.0/2310.0.66.1 – 10.0.67.25410.0.67.255
310.0.68.0/2310.0.68.1 – 10.0.69.25410.0.69.255
410.0.70.0/2310.0.70.1 – 10.0.71.25410.0.71.255
510.0.72.0/2310.0.72.1 – 10.0.73.25410.0.73.255
610.0.74.0/2310.0.74.1 – 10.0.75.25410.0.75.255
710.0.76.0/2310.0.76.1 – 10.0.77.25410.0.77.255
810.0.78.0/2310.0.78.1 – 10.0.79.25410.0.79.255
910.0.80.0/2310.0.80.1 – 10.0.81.25410.0.81.255
1010.0.82.0/2310.0.82.1 – 10.0.83.25410.0.83.255
1110.0.84.0/2310.0.84.1 – 10.0.85.25410.0.85.255
1210.0.86.0/2310.0.86.1 – 10.0.87.25410.0.87.255
1310.0.88.0/2310.0.88.1 – 10.0.89.25410.0.89.255
1410.0.90.0/2310.0.90.1 – 10.0.91.25410.0.91.255
1510.0.92.0/2310.0.92.1 – 10.0.93.25410.0.93.255
1610.0.94.0/2310.0.94.1 – 10.0.95.25410.0.95.255
1710.0.96.0/2310.0.96.1 – 10.0.97.25410.0.97.255
1810.0.98.0/2310.0.98.1 – 10.0.99.25410.0.99.255
1910.0.100.0/2310.0.100.1 – 10.0.101.25410.0.101.255
2010.0.102.0/2310.0.102.1 – 10.0.103.25410.0.103.255
2110.0.104.0/2310.0.104.1 – 10.0.105.25410.0.105.255
2210.0.106.0/2310.0.106.1 – 10.0.107.25410.0.107.255
2310.0.108.0/2310.0.108.1 – 10.0.109.25410.0.109.255
2410.0.110.0/2310.0.110.1 – 10.0.111.25410.0.111.255
2510.0.112.0/2310.0.112.1 – 10.0.113.25410.0.113.255
2610.0.114.0/2310.0.114.1 – 10.0.115.25410.0.115.255
2710.0.116.0/2310.0.116.1 – 10.0.117.25410.0.117.255
2810.0.118.0/2310.0.118.1 – 10.0.119.25410.0.119.255
2910.0.120.0/2310.0.120.1 – 10.0.121.25410.0.121.255
3010.0.122.0/2310.0.122.1 – 10.0.123.25410.0.123.255
3110.0.124.0/2310.0.124.1 – 10.0.125.25410.0.125.255
3210.0.126.0/2310.0.126.1 – 10.0.127.25410.0.127.255
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 →