how to find the ip address of managed switches?

I need to find the IP addresses of three managed switches in a building.  There is no documentation about the existing setup.  
Will arp - give me a list of all static addresses on the LAN, to which I connect to each one and find out which are the make and models of the switches?
Or, is there a better way to find the addresses, without making changes to the existing setup?
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Do you know what the user-id and password is to get into the switches?

Do you know where they are physically?

Most managed switches have console ports where you can physically connect a computer directly to them.

The one problem that you may find with the tools mentioned is that some switches are configured with ACL's to only allow specific IP address(es) to access them for managment purposes.

Another tool you could use is NMAP.  It will scan an IP address range and using fingerprinting attempt to tell you what the device is.
Rob WilliamsCommented:
LookAtLan will scan the network, advise as to known operating systems, and of SNMP enabled devices like printers and switches:
Steven CarnahanNetwork ManagerCommented:
Yes, LookAtLan is a great tool.  Another one is LanTopolog.
Rob WilliamsCommented:
Sorry, I just checked an apparently lookatlan will not run on Window7/Server 2008. However it has been replaced by Fing a command line version:
 Another similar but less extensive app is angry ip scanner:

If you happen to have something like a Fluke LAN meter you can plug it into the switch and it will tell you the IP.
AE_JBAuthor Commented:
That should do it.  I located two of the switches, and will check the manuals for connection and management options.
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