DNS CLASS values. IN (Internet) is the only class used in practice.
IN
1.0.4
Any class (QCLASS *).
*
Chaos (rarely used, e.g. version.bind).
version.bind
Hesiod.
Internet.
No class (used in dynamic-update prerequisites).
DNS CLASS values.
IN(Internet) is the only class used in practice.Since
1.0.4