[Tfug] Weird info in a tcpdump

[Steven Bowers]

I'm doing some work for a local non-profit entity and came across 
something completely bizarre. While running tcpdump to look for 
something else I saw:

#tcpdump -n -ttt -i fxp1
Aug 30 22:52:55.989160 255.89.1.6 > 0.0.6: at-#6 25
Aug 30 22:52:56.087302 255.89.1.6 > 0.0.6: at-#6 25
Aug 30 22:52:56.185906 255.89.1.6 > 0.0.6: at-#6 25
Aug 30 22:52:56.284358 255.89.1.6 > 0.0.6: at-#6 25
Aug 30 22:52:56.382958 255.89.1.6 > 0.0.6: at-#6 25

in the dump. It's unlike anything I have ever seen and the destination 
address, if you can call it that, makes no sense. Google has about a 
half dozen hits from others asking what is it, but no one responded.
Has anyone here seen anything like it, or know what it is?

Steve