Sorry if this is off topic. I'm seeing a bunch of this (and have been for ages) in my bind logs: http://pastebin.com/ydL0RhG4 (sample line for archives, when paste goes away: Nov 28 23:14:58 jet named[28427]: DNS format error from 120.204.202.200#53 resolving ns-os1.qq.com/AAAA: invalid response ) My understanding is qq.com is a Chinese IM service (which my flatmate uses). Dig doesn't tell me about any error; it merely doesn't return any AAAA records. Any suggestions on: - whether I should care, or just filter it out of my logcheck email - whether there's something I can fix - whether there's something I can do to figure out in more detail what's happening Note that this is my caching NS, on my home network (behind NAT) Thanks, Richard