With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
docsIfCmtsCmStatusMacAddress
DOCSIS If Cmts Cm Status Mac Address
1.3.6.1.4.1.2011.2.25.127.1.3.3.1.2
MAC address of the cable modem. If the cable modem has multiple MAC addresses, this is the MAC address associated with the Cable interface.
Back to DOCS-IF-MIB MIB page.
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