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Comment by teddyh | Hacker News Reader

Look at, for example, "nmu360.se". It is registered, but has no name servers configured.

Whois says it has no name server (what a weird format that of .se), but digg finds an A record with 92.242.140.20 (what seems to be a register IP).

Let me guess: Your ISP is injecting fake DNS responses.

   echo nmu360.se|exec nc -vvn 91.226.37.83 43

Very good example. Thanks a lot.