[tor-relays] "Your IP seems to have changed" notice

This morning (9:30 UTC), my relay (nebo.xmmswap.com) printed

09:30:08.000 Your IP seems to have changed to <<Search Guide AS36029 range>> (METHOD=GETHOSTNAME HOSTNAME=nebo). Updating. 09:30:08.000 Our IP Address has changed from 217.182.198.76 to <<Search Guide AS36029 range>>; rebuilding descriptor (source: METHOD=GETHOSTNAME HOSTNAME=nebo). ...

Six minutes later it was back to normal:

09:36:08.000 Your IP address seems to have changed to 217.192.198.76 (METHOD=INTERFACE). Updating.

What was that? A DNS hijack?

I'm running 0.3.2.10 on NetBSD. My DNS upstream is GoDaddy. Secondary DNS is OVH.