Reverse IP Address Lookup with ColdFusion + Java

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", "java.net.InetAddress")>
<cfset host_name = inet_address.getByName("66.249.66.99").getHostName()>
<cfoutput>#host_name#</cfoutput>

In java this would simply be:

System.out.println( java.net.InetAddress.getByName("66.249.66.99").getHostName() );

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Comments

Fernando S. Trevisan

Or you could use: <cfscript> writeOutput(CreateObject("java", "java.net.InetAddress").getByName("66.249.66.99").getHostName()); </cfscript> [ ]'s great post =)

Fernando S. Trevisan

OR: <cfoutput>#CreateObject("java", "java.net.InetAddress").getByName("66.249.66.99").getHostName()#</cfoutput> As well =))

Pete Freitag

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.

Scott F Stroz

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.

Adam Howitt

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.