Bit,Flag,Description,Reference bit 5,AA,Authoritative Answer,[RFC1035] bit 6,TC,Truncated Response,[RFC1035] bit 7,RD,Recursion Desired,[RFC1035] bit 8,RA,Recursion Available,[RFC1035] bit 9,,Reserved, bit 10,AD,Authentic Data,[RFC4035][RFC6840][RFC Errata 4924] bit 11,CD,Checking Disabled,[RFC4035][RFC6840][RFC Errata 4927]