Why is my AE port-scanning my Macbook from port 53?

I got a Macbook Pro for Xmas, so I setup my Airport Extreme Base Station (AE) again. I also have my old iMac connected to the AEB LAN port, although it's asleep most of the time.
The MB's log shows stealth-mode port-scanning from 10.0.0.1:53 (i.e., the AE) every 4 seconds or so. I assume it's the AEBS itself that's doing this, since the iMac is asleep.
What's going on?

I got an answer (sort of) from Apple engineering.
Port 53 is used for DNS, and it's "normal and harmless" for the AEBS (that older model at least -- don't know about newer ones) to do this. No explanation as to why.

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