Usually after $TTL and $ORIGIN there is a line starting with @ and IN in zone name then email address of admin, what does @ mean here and in the next entries?

1 Answer

$ORIGIN is used in two contexts during zone file processing:

  1. The symbol @ forces substitution of the current (or synthesized) value of $ORIGIN. The @ symbol is replaced with the current value of $ORIGIN.
  2. The current value of $ORIGIN is added to any 'unqualified' name (any name which does not end in a 'dot').

Example of @ symbol replacement:

; example.com zone file fragment ; no $ORIGIN present and is synthesized from the ; zone name in named.conf .... @ IN NS ns1.example.com. ; ns1.example.com is the name server for example.com .... $ORIGIN uk.example.com. @ IN NS ns2.example.com. ; functionally identical to ; uk.example.com. IN NS ns2.example.com. ; ns2.example.com is the name server for uk.example.com
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