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arp-scan shows invalid ip with mac address

I ran an arp-scan on my network today and noticed something weird along with our normal addresses:      88:43:e1:76:af:4f      (Unknown)      68:ef:bd:df:1c:78      (Unknown) (DUP: 2)

Anyone ever seen invalid or .0 addresses show up like this?

Thanks in advance!
1 Solution
Matt VCommented:
Both of those are Cisco MAC addresses, I would suspect you have interfaces with no IP address that bridge to addressed VLAN or Loopback interfaces.  
bbrunningAuthor Commented:
That was it!

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