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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)10.16.0.0/18
network10.16.0.0/18
broadcast10.16.63.255
first host10.16.0.1
last host10.16.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.16.0.0/18
address00001010.00010000.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010000.00000000.00000000
broadcast00001010.00010000.00111111.11111111
green = network part, grey = host part
hex0x0a100000
decimal168820736
reverse dns0.0.16.10.in-addr.arpa
ipv4-mapped::ffff:a10:0

/18 split into /23 · 32 subnets

close ×
#networkhost rangebroadcast
110.16.0.0/2310.16.0.1 – 10.16.1.25410.16.1.255
210.16.2.0/2310.16.2.1 – 10.16.3.25410.16.3.255
310.16.4.0/2310.16.4.1 – 10.16.5.25410.16.5.255
410.16.6.0/2310.16.6.1 – 10.16.7.25410.16.7.255
510.16.8.0/2310.16.8.1 – 10.16.9.25410.16.9.255
610.16.10.0/2310.16.10.1 – 10.16.11.25410.16.11.255
710.16.12.0/2310.16.12.1 – 10.16.13.25410.16.13.255
810.16.14.0/2310.16.14.1 – 10.16.15.25410.16.15.255
910.16.16.0/2310.16.16.1 – 10.16.17.25410.16.17.255
1010.16.18.0/2310.16.18.1 – 10.16.19.25410.16.19.255
1110.16.20.0/2310.16.20.1 – 10.16.21.25410.16.21.255
1210.16.22.0/2310.16.22.1 – 10.16.23.25410.16.23.255
1310.16.24.0/2310.16.24.1 – 10.16.25.25410.16.25.255
1410.16.26.0/2310.16.26.1 – 10.16.27.25410.16.27.255
1510.16.28.0/2310.16.28.1 – 10.16.29.25410.16.29.255
1610.16.30.0/2310.16.30.1 – 10.16.31.25410.16.31.255
1710.16.32.0/2310.16.32.1 – 10.16.33.25410.16.33.255
1810.16.34.0/2310.16.34.1 – 10.16.35.25410.16.35.255
1910.16.36.0/2310.16.36.1 – 10.16.37.25410.16.37.255
2010.16.38.0/2310.16.38.1 – 10.16.39.25410.16.39.255
2110.16.40.0/2310.16.40.1 – 10.16.41.25410.16.41.255
2210.16.42.0/2310.16.42.1 – 10.16.43.25410.16.43.255
2310.16.44.0/2310.16.44.1 – 10.16.45.25410.16.45.255
2410.16.46.0/2310.16.46.1 – 10.16.47.25410.16.47.255
2510.16.48.0/2310.16.48.1 – 10.16.49.25410.16.49.255
2610.16.50.0/2310.16.50.1 – 10.16.51.25410.16.51.255
2710.16.52.0/2310.16.52.1 – 10.16.53.25410.16.53.255
2810.16.54.0/2310.16.54.1 – 10.16.55.25410.16.55.255
2910.16.56.0/2310.16.56.1 – 10.16.57.25410.16.57.255
3010.16.58.0/2310.16.58.1 – 10.16.59.25410.16.59.255
3110.16.60.0/2310.16.60.1 – 10.16.61.25410.16.61.255
3210.16.62.0/2310.16.62.1 – 10.16.63.25410.16.63.255
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 →