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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)10.90.0.0/18
network10.90.0.0/18
broadcast10.90.63.255
first host10.90.0.1
last host10.90.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.90.0.0/18
address00001010.01011010.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.01011010.00000000.00000000
broadcast00001010.01011010.00111111.11111111
green = network part, grey = host part
hex0x0a5a0000
decimal173670400
reverse dns0.0.90.10.in-addr.arpa
ipv4-mapped::ffff:a5a:0

/18 split into /23 · 32 subnets

close ×
#networkhost rangebroadcast
110.90.0.0/2310.90.0.1 – 10.90.1.25410.90.1.255
210.90.2.0/2310.90.2.1 – 10.90.3.25410.90.3.255
310.90.4.0/2310.90.4.1 – 10.90.5.25410.90.5.255
410.90.6.0/2310.90.6.1 – 10.90.7.25410.90.7.255
510.90.8.0/2310.90.8.1 – 10.90.9.25410.90.9.255
610.90.10.0/2310.90.10.1 – 10.90.11.25410.90.11.255
710.90.12.0/2310.90.12.1 – 10.90.13.25410.90.13.255
810.90.14.0/2310.90.14.1 – 10.90.15.25410.90.15.255
910.90.16.0/2310.90.16.1 – 10.90.17.25410.90.17.255
1010.90.18.0/2310.90.18.1 – 10.90.19.25410.90.19.255
1110.90.20.0/2310.90.20.1 – 10.90.21.25410.90.21.255
1210.90.22.0/2310.90.22.1 – 10.90.23.25410.90.23.255
1310.90.24.0/2310.90.24.1 – 10.90.25.25410.90.25.255
1410.90.26.0/2310.90.26.1 – 10.90.27.25410.90.27.255
1510.90.28.0/2310.90.28.1 – 10.90.29.25410.90.29.255
1610.90.30.0/2310.90.30.1 – 10.90.31.25410.90.31.255
1710.90.32.0/2310.90.32.1 – 10.90.33.25410.90.33.255
1810.90.34.0/2310.90.34.1 – 10.90.35.25410.90.35.255
1910.90.36.0/2310.90.36.1 – 10.90.37.25410.90.37.255
2010.90.38.0/2310.90.38.1 – 10.90.39.25410.90.39.255
2110.90.40.0/2310.90.40.1 – 10.90.41.25410.90.41.255
2210.90.42.0/2310.90.42.1 – 10.90.43.25410.90.43.255
2310.90.44.0/2310.90.44.1 – 10.90.45.25410.90.45.255
2410.90.46.0/2310.90.46.1 – 10.90.47.25410.90.47.255
2510.90.48.0/2310.90.48.1 – 10.90.49.25410.90.49.255
2610.90.50.0/2310.90.50.1 – 10.90.51.25410.90.51.255
2710.90.52.0/2310.90.52.1 – 10.90.53.25410.90.53.255
2810.90.54.0/2310.90.54.1 – 10.90.55.25410.90.55.255
2910.90.56.0/2310.90.56.1 – 10.90.57.25410.90.57.255
3010.90.58.0/2310.90.58.1 – 10.90.59.25410.90.59.255
3110.90.60.0/2310.90.60.1 – 10.90.61.25410.90.61.255
3210.90.62.0/2310.90.62.1 – 10.90.63.25410.90.63.255
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 →