Pete Freitag Pete Freitag

Reverse IP Address Lookup with ColdFusion + Java

Published on January 10, 2007
By Pete Freitag

I needed to do a reverse lookup on some IP addresses in a database today. I found that you can do this pretty easily with java, and just as easily with ColdFusion. Here it is:

<cfset inet_address = CreateObject("java", "")>
<cfset host_name = inet_address.getByName("").getHostName()>

In java this would simply be:

System.out.println("").getHostName() );

dns ip lookup cfml java inetaddress

Reverse IP Address Lookup with ColdFusion + Java was first published on January 10, 2007.

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Or you could use:

writeOutput(CreateObject("java", "").getByName("").getHostName());

[ ]'s great post =)
by Fernando S. Trevisan on 01/10/2007 at 2:29:22 PM UTC
<cfoutput>#CreateObject("java", "").getByName("").getHostName()#</cfoutput>

As well =))
by Fernando S. Trevisan on 01/10/2007 at 2:52:25 PM UTC
Right on Fernando - I wasn't trying to make it look easier in java, but after reading the post again some might have come away with that. The same shortcuts I used in the java example could be used in ColdFusion as you did, above.
by Pete Freitag on 01/10/2007 at 3:55:05 PM UTC
Wow. I had a need for using the InetAddress Java class today as well. I planned on blogging it, but you beat me to it.
by Scott F Stroz on 01/10/2007 at 4:56:26 PM UTC
We also use inet_address.getLocalHost().getCanonicalHostName()
for one of our sites in a cluster so if a client has an issue we can have them view source and read out the machine name.
by Adam Howitt on 01/11/2007 at 6:49:03 AM UTC