OneSixtyOne Fast SNMP scanner
onesixtyone is an SNMP scanner which utilizes a sweep technique to achieve very high performance. It can scan an entire class B network in under 13 minutes. It can be used to discover devices responding to well-known community names or to mount a dictionary attack against one or more SNMP devices.
The SNMP protocol is a stateless, datagram oriented protocol. An SNMP scanner sends SNMP requests to multiple IP addresses, trying different community strings and waiting for a reply. Unfortunately SNMP servers don't respond to requests with invalid community strings and the underlying UDP protocol does not reliably report closed UDP ports. This means that "no response" from a probed IP address can mean either of the following:
* machine unreachable
* SNMP server not running
* invalid community string
* the response datagram has not yet arrived
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