Software for engineering that would tell us what all is already out there on the network

I may need to locate resources such as IP addresses, vlans and the likes in a big shop.

There is the standard problem, IP addresses are used and not documented or given back and not documented.

I would like to know as much about the systems as I can withing reason such as router information, OSes, perhaps a little application information.

What are the popular tools for this ?

thx
TIMFOX123Asked:
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Scott CSenior EngineerCommented:
Network Detective
http://www.rapidfiretools.com/

WhatsUPGold
http://www.whatsupgold.com/

I've used both of these and they are excellent.

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TIMFOX123Author Commented:
this works

thx
Scott CSenior EngineerCommented:
Anytime.
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