The record begins with the complete domain name including the closing period. The record may be held for 12,879 seconds (so approximately 3.5 hours) in the cache before the information must be requested again. If this field is left empty, a default value is accepted that is inserted at the beginning of the zone file. The class is naturally the internet (IN). The only alternatives would be the Hesiod (with the abbreviation HS) and Chaosnet (with the abbreviation CH) networks, both of which are no longer used. If the field is left empty, the internet is automatically adopted as the class.
In the type field, A record is specified as the type, which is why in this case an A is entered. For this example, the record’s size field is blank. Theoretically, however, it would be 4. Finally, the last field specifies the IP address.
In addition to this type of notation, however, you can also use one based on the use of placeholders: