Dynamic Host Name lookup?

[cf_code_warrior]

Ok, using CF 7.0.0, and I am familiar with cgi scope vars. Especially those that deal with ip of origin.

I want to be able to "trap" users who are using a specific provider. We have a hacker using a VPN that generates a dynamic IP but the reverse lookup is always the same. Is there way to perform a real time reverse lookup?

Quick enough to get a fast page load but also maintain a degree of security?

Perhaps an undocumented CGI var like namelookup(cgi.remote_addr) ?

Thanks!

[Grant]

I'm using the component lg.cfc ("Coldfusion Ping, Traceroute, Dig, Whois Client") from www.maxnoc.com for DNS lookup. I think I found the component on the tag gallery. It seems reasonably fast but you'll have to test it and/or put a timeout on the CFINVOKE tag.

Here's what I ran to isolate the domain name:

<!--- Call lg.cfc for DNS lookup --->
<cfsavecontent VARIABLE="fullresults">
<CFINVOKE
COMPONENT="lg"
METHOD="nslookup"
parameter="#the_ipaddress#"></CFINVOKE>
</cfsavecontent>

<!--- parse out line we are interested in (just domain name) --->
<CFSET domain_name=REReplace(variables.fullresults, ".*name = (.*).<br>A.*", "\1")>

[cf_code_warrior]

This sounds marvellous ... but you gave confused me ... what does maxnoc have to do with it? Which tag gallery - on "our" web site here? maxnoc is the author?
Assuming tag library is now called Exchange I did a global search for lg.cfc and came up blank. I definately do not see a tag lib at maxnoc.
?
R

[-__cfSearching__-]

See this page at maxnoc

http://www.maxnoc.com/support/knowledge-base/coldfusion_looking_glass.html

[jqcf]

is there a new and better way to do this in CF 8?

[-__cfSearching__-]

Not that I am aware of. Though there are other java options

http://www.cflib.org/udf.cfm?ID=446
http://www.phillnacelli.net/blog/index.cfm/2007/2/21/DNS-Lookup-in-ColdFusion