Reverse IP Address Lookup with ColdFusion + Java

January 10, 2007
coldfusionjava

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

Or you could use: <cfscript> writeOutput(CreateObject("java", "java.net.InetAddress").getByName("66.249.66.99").getHostName()); </cfscript> [ ]'s great post =)
OR: <cfoutput>#CreateObject("java", "java.net.InetAddress").getByName("66.249.66.99").getHostName()#</cfoutput> As well =))
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.
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.
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.
http://www.ipgp.net is a good tool to view information about ip addresses
why not use this accurate ip address locator: http://www.ip-adress.com


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