Nslookup and fully qualified name

Having a problem with nslookup and dig for a host that is completely all numbers.

for example, if you do nslookup or dig on 437542 it returns no answer or nxdomain.

However if you do 437542.domain.com with nslookup or dig, it returns an answer. You might say that my resolv list is not right, but if you do a www for domain.com and my resolv list appends domain.com www works.

What is going on with this?

thanks,

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