Trying To Enumerate As Many Unique Subdomains As Possible

I'm trying to enumerate as many unique subdomains as possible, and I have tried using Bing's IP operator, but the limited number of results is too small for the list I need.  So my main question,  if I can't dig DNS and Bing artificially limits its results, anyone know what the next legal method of enumeration...? Thanks in advance for the insight!
Kitten HarpainInternet Marketing ManagerAsked:
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Joseph DalyConnect With a Mentor Commented:
You may want to try downloading the trial of maltego. It is an open source network information gathering tool.
Kitten HarpainInternet Marketing ManagerAuthor Commented:
Thanks Joe!
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