How to implement a LAN scanner in Java?

Hi everyone,
I am new to Java programming. I am working upon a task in which I need to scan the entire LAN using an IP address range. The requirement is to determine each device type i.e. routers, hubs, switches, hosts, etc. on the network using IP address. Can anyone help me? Thanks in advance.

can we atleast know which devices within a givenIP
address range are present irrespective of theirdevice types?
Not reliably. You can ping computers that reply to
ping, or query a well known service (e.g. datetime)
if the computer responds to such queries. More and
more computers don't reply to such queries for
security reasons. They are configured to be "black
holes" so that malware doesn't find them quite so
easily. Firewalls also often block such connections.
What are you really trying to do? Why do you want to
scan addresses?Ok. Let me tell u what exactly I want. First of all I want to determine the OIDs of all the managed objects on each node in the network. The OID for same type of managed objects on different nodes is always the same across all the platforms. So, once we know the OID of our required objects on each node in the network, we can query those nodes for the values of that OIDs. So, precisely, I want to have the OIDs and as a subsequently I want to query the nodes for their values. Is this possible using Java. If so, then please reply. Thank you.

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