Here's a handy site for system administrators, and other such people: dnsstuff.com. It has several web based dns and ip lookup tools. One handy one is the ISP cached dns lookup. This is handy for testing round robin dns, and also to see when your dns changes take effect, here's a lookup of www.yahoo.com they are using round robin dns (different ISP's are getting different IP's to goto).
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DNS Stuff was first published on November 03, 2003.