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javaip-addresshostnameinetaddresscanonical-name

Host Name Vs Canonical Host Name

Can anyone please explain me the difference between Host Name and Canonical Host Name?

I am currently using InetAddress class to fetch host name using the IP Address. I came across these 2 APIs. So I am just wondering, which one I should opt for?

Solution

  • There are a few difference between the two:

    • getCanonicalHostName() will attempt to resolve the FQDN. Therefore, you would get foo.mycompany.com whereas getHostName() might just return foo.

    • getCanonicalHostName() will always do a reverse DNS lookup, whereas getHostName() would return the stored hostname if you supplied one in the InetAddress constructor.

    I suspect you will be wanting to use getCanonicalHostName() if you are intending to map IP addresses to host names.