DNS RCODEs

[Livid]

0 NoError No Error
1 FormErr Format Error
2 ServFail Server Failure
3 NXDomain Non-Existent Domain
4 NotImp Not Implemented
5 Refused Query Refused

[likexian]

http://www.faqs.org/rfcs/rfc1035.html

4.1.1. Header section format