About Reserved Names and Name Collision Occurrence Management
All registry operators are required by their Registry Agreement (RA) to exclude certain domain names from registration in a Top Level Domain (TLD). These reserved names include strings that are for Country Code Top Level Domains (ccTLDs), ICANN-related names (such as ICANN), IANA-related names (such as example), country and territory names, international and intergovernmental organizations and names that the registry operator can use in connection with the operation of the TLD.
A list of reserved names required for each TLD is in its RA, and may vary depending on the TLD. For some TLDs, their registry operators may withhold from registration at all levels domain names that are not activated in the DNS and release them for registration to another person or entity at the registry operator's discretion. To determine which RA applies to a TLD, please see ICANN's webpage with all current registry agreements.
Registry operators may obtain authorization to release certain reserved names as described in the relevant RA. However, they are not required by the RA to release those names, even if authorized to do so. Authorizations granted by ICANN are published on the RA webpage for the TLD.
For information about Name Collision Occurrence Management, please visit https://www.icann.org/resources/pages/name-collision-2013-12-06-en
If you have a complaint about reserved names or Name Collision, please submit a Reserved Names and Name Collision Occurrence Management Complaint Form.