Yeah, it means that nslookup is old and no longer supported. Use the command "dig" or "host" instead. If you look at the manpage for nslookup there is a flag (I think it's "-s") which will suppress the message. Then all you have to do is alias nslookup="nslookup -s" in your environment and you won't see the message again. But I suggest you just get used to using DIG, it's much more informative anyway.
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