Windows DHCP can register host records (A) and Reverse lookup or Pointer (PTR) resource records automatically whenever you add a new device to the network. This enables simplified and easy network administration. However, these records are not automatically purged when they are stale or outdated (say when the host gets a new IP address) and they remain in the DNS zone database indefinitely. This can cause network issues and can prevent host names from re-used.
However, this can be overcome by configuging the DNS Server to track the age of each dynamically-assigned record and to periodically remove records (also called scavenging) that are older than the number of days that you specify.
The age of a resource record is based on when it was created or when it was last updated. By default, Windows client systems by default send a request every 24 hours to the DNS server to update their records. This prevents the records the records from being removed from the database.
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