How to do a reverse dns lookup on my server

I am trying to configure Stamps.com API interface. I was told I need to provide the external ip address so they can put it behind their firewall. I imagine this is as simple as Remote Desktop into my server,pull up a browser, go to whatsmyip.com and the address they come back with is my external addresss correct. I just cannot believe the Stamps.com verbage. Thoughts?
jeffmeverettAsked:
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footechCommented:
That's certainly an easy way to get your external IP.  Their verbiage is certainly odd.  I'm assuming that they have to program something in so that traffic from your IP is allowed, or maybe they associated some sort of user ID with the source IP so that traffic using a specific user ID can only come from a specific IP.  Seems like a crappy way to do things though.  If that's what they're doing, they should tell you straight up, and not say something stupid like they're putting it behind their firewall.  Next they'll be saying, "All your bases are belong to us."

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jeffmeverettAuthor Commented:
I agree with you fully about the verbage! I was trying to do some preiminary work for my developer before he started. Its was trying to incorporate Stamps.com API. He could not get it to work anyway. Thanks for all your help!
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