If you have a DNS record (such as an A Record) with "PARK" as the IP address, then traffic for that hostname will be directed to our Parking Page.
Or, if you're using the New DNS Editor, the "TYPE" will be set to "PARK", which means that the host is directing traffic to our Parking Page.
Also, since A Records can have a Round-Robin configuration, if you've added an IP address to an existing hostname and left the PARK entry there, it's recommended that you delete the PARK record since it will be in conflict.