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This means that there is some load balancing or site-selection going on - and ew-in-f155 is the actual host you will end up going to (for example if you looked up www.google.co.uk).
while thats true im not sure thats what he is asking it aldepends what he is performing the nslookup on tbh if its his default server then yes id be slightly worried
If you do a netstat -b it will tell you what programme is using that port, but as McBunny says, it'll probbaly be a google toolbar or something like that.