When a request is received where cache retrieval is specified, the following takes place:

1. Attempt to retrieve this entry from the cache. If unsuccessful, issue the GETHOSTBYNAME call unless request specifies cache only.
2. If cache retrieval is successful, calculate the age of the record. This is the difference between the current time and the time this record was created or refreshed.
   • If the age is not greater than minimum cache refresh, use the cache information and build the Hostent structure for the requestor. Then return to the requestor.
   • If the age is greater than the maximum cache refresh, issue the GETHOSTBYNAME call and refresh the cache record with the results.
   • If the age is between the minimum and maximum cache refresh values, do the following:
     1. Calculate the difference between the maximum and minimum cache refresh times and divide it by the maximum number of concurrent resolver requests. The result is called the time increment.
     2. Multiply the time increment by the number of currently active resolver requests. Add this time to the minimum refresh time giving the adjusted refresh time.
     3. If the age of the record is less than the adjusted refresh time, use the cache record.
     4. If the age of the record is greater than the adjusted refresh time, issue the GETHOSTBYNAME call and refresh the cache record with the results.
   • If the GETHOSTBYNAME is issued and is successful, the cache is updated and the update time for the entry is changed to the current time.