Reserved names for English Domain Name are categorised as follows:

1. All single-character labels, including A to Z, 0 to 9 and '-'
2. Generic Top level Domain Name (gTLDs) annouced by Internet Corporation for Assigned Names and Numbers (ICANN)
3. Country Code Top Level Domains (ccTLD) announced by Internet Assigned Numbers Authority (IANA)
4. Sponsored Top-level Domains(sTLDs) announced by Internet Corporation for Assigned Names and Numbers(ICANN)
5. Technical Terms
6. Common Chinese Surnames in Hong Kong(for idv.hk and Second-level '.hk' Domain Names Only)
7. Words controlled by Law and Order
8. Current or likely new types of domain names
9. Words of operational needs

Reserved names for Chinese Domain Name are categorised as follows:

1. The Chinese translation of Generic Top level Domain Name (gTLDs) and sponsored Top level Domain Name (sTLDs) announced by Internet Corporation for Assigned Names and Numbers (ICANN)
2. Names of countries/regions that use Chinese characters
3. Common technical terms related to domain names and related international domain name associations
4. Types of school in different levels and educational institutions in Hong Kong
5. Common Chinese surnames in Hong Kong (for .個人.hk and second-level '.hk' domain names only)
6. Chinese words controlled by Law and Order
7. Current and likely new types of Chinese domain names
8. Chinese words of operational needs

Domain Names in the Reserved List are not available for registration. Reserved names are subject to change.