Notes

lags:
AA = Authoritative Answer

TC = Truncation

RD = Recursion Desired (set in a query and copied into the response if recursion is supported)

RA = Recursion Available (if set, denotes recursive query support is available)

AD = Authenticated Data (for DNSSEC only; indicates that the data was authenticated)

CD = Checking Disabled (DNSSEC only; disables checking at the receiving server)

Response code:

0 = NOERR, no error

1 = FORMERR, format error (unable to understand the query)

2 = SERVFAIL, name server problem

3= NXDOMAIN, domain name does not exist

4 = NOTIMPL, not implemented

5 = REFUSED (e.g., refused zone transfer requests)

DNSKEY resource records