network mapping tool

Hello Everyone,
I am about to evaluate a new facility. IT already has an existing network in place. I am looking for a tool that I can use to scan the network and discover devices, layout, subnets, etc.

I have used IP scanners in the past, however, I was hoping for something that will also use snmp to discover devices.

This is going to be for one project, so I can't spend a lot of money on it. I am hoping to stay under $300.

I am most looking for:
- IP Address & host name (maybe mac address?)
- make, model, version, firmware version
- would be nice to get to see which ports are open on a device.
- would be nice to get some topological view of the network, but that isn't 100% necessary.

I am not looking for an in depth security analysis tool. I am not looking to "hack" the network or make changes. I am not looking to leave it in place and monitor changes. I am not looking for active directory, data, or disk utilization. I am not looking for any kind of performance monitoring.

Any suggestions?
Jack5BackAsked:
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Jack5BackAuthor Commented:
This wasn't exactly what I was looking for. But, I appreciate the input.
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