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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)10.3.192.0/18
network10.3.192.0/18
broadcast10.3.255.255
first host10.3.192.1
last host10.3.255.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.3.192.0/18
address00001010.00000011.11000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000011.11000000.00000000
broadcast00001010.00000011.11111111.11111111
green = network part, grey = host part
hex0x0a03c000
decimal168017920
reverse dns0.192.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:c000

/18 split into /23 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.192.0/2310.3.192.1 – 10.3.193.25410.3.193.255
210.3.194.0/2310.3.194.1 – 10.3.195.25410.3.195.255
310.3.196.0/2310.3.196.1 – 10.3.197.25410.3.197.255
410.3.198.0/2310.3.198.1 – 10.3.199.25410.3.199.255
510.3.200.0/2310.3.200.1 – 10.3.201.25410.3.201.255
610.3.202.0/2310.3.202.1 – 10.3.203.25410.3.203.255
710.3.204.0/2310.3.204.1 – 10.3.205.25410.3.205.255
810.3.206.0/2310.3.206.1 – 10.3.207.25410.3.207.255
910.3.208.0/2310.3.208.1 – 10.3.209.25410.3.209.255
1010.3.210.0/2310.3.210.1 – 10.3.211.25410.3.211.255
1110.3.212.0/2310.3.212.1 – 10.3.213.25410.3.213.255
1210.3.214.0/2310.3.214.1 – 10.3.215.25410.3.215.255
1310.3.216.0/2310.3.216.1 – 10.3.217.25410.3.217.255
1410.3.218.0/2310.3.218.1 – 10.3.219.25410.3.219.255
1510.3.220.0/2310.3.220.1 – 10.3.221.25410.3.221.255
1610.3.222.0/2310.3.222.1 – 10.3.223.25410.3.223.255
1710.3.224.0/2310.3.224.1 – 10.3.225.25410.3.225.255
1810.3.226.0/2310.3.226.1 – 10.3.227.25410.3.227.255
1910.3.228.0/2310.3.228.1 – 10.3.229.25410.3.229.255
2010.3.230.0/2310.3.230.1 – 10.3.231.25410.3.231.255
2110.3.232.0/2310.3.232.1 – 10.3.233.25410.3.233.255
2210.3.234.0/2310.3.234.1 – 10.3.235.25410.3.235.255
2310.3.236.0/2310.3.236.1 – 10.3.237.25410.3.237.255
2410.3.238.0/2310.3.238.1 – 10.3.239.25410.3.239.255
2510.3.240.0/2310.3.240.1 – 10.3.241.25410.3.241.255
2610.3.242.0/2310.3.242.1 – 10.3.243.25410.3.243.255
2710.3.244.0/2310.3.244.1 – 10.3.245.25410.3.245.255
2810.3.246.0/2310.3.246.1 – 10.3.247.25410.3.247.255
2910.3.248.0/2310.3.248.1 – 10.3.249.25410.3.249.255
3010.3.250.0/2310.3.250.1 – 10.3.251.25410.3.251.255
3110.3.252.0/2310.3.252.1 – 10.3.253.25410.3.253.255
3210.3.254.0/2310.3.254.1 – 10.3.255.25410.3.255.255
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 →