[c-nsp] vs scanning tool for uknown network units

[Arne Larsen / Region Nordjylland]

Hi Folks

Can anyone help me out here, I've hit a dead lock.
My problem is I need to implement HP Open View, but the guys from HP have told me that this can't be done before all network units are in DNS.
Now my problem is, nobody in the company   I've joined, have a complete list over the network units, neither address nor DNS name.
The network documentation is a total mess, and no one knows what's up or down,
Is there a scanning tool available for such a purpose?  I've used nmap but I can't seem to be able to get the real information out. Many switches are routing and using vrf lite, so I can't see what the management interface is and what is just a normal VLAN.

/Arne