I'm currently using NeoTrace Pro (http://www.neotrace.com/) which is really good, but I am looking for web-based ones.

Thanks in advance for any info/ recommendation.

http://www.arin.net/whois/

Is that any help ???

www.dnsstuff.com is all you need

http://countrycheck.com/

Works ok.

This ones great:

www.samspade.org