TLD Types & Classification
How top-level domains are categorized: gTLDs, ccTLDs, sTLDs, and the new gTLD program.
TLD（顶级域名）
The last segment of a domain name (e.g., .com, .org, .uk).
gTLD（通用顶级域名）
Top-level domain with 3+ characters not tied to a specific country.
ccTLD（国家代码顶级域名）
Two-letter TLD assigned to a specific country or territory.
新gTLD（新通用顶级域名）
Generic top-level domains introduced through ICANN's 2012+ New gTLD Program.
传统TLD（旧有顶级域名）
Original gTLDs (.com, .net, .org) that predate the New gTLD Program.
sTLD（赞助顶级域名）
Specialized TLD with eligibility requirements, managed by a sponsoring organization.
品牌TLD（.brand）
New gTLD using a company's brand name, operated exclusively by that company.
地理TLD（GeoTLD）
New gTLD representing a geographic region (city, state, or territory).
IDN TLD（国际化域名TLD）
TLD written in non-Latin scripts (Arabic, Chinese, Cyrillic, etc.).
SLD（二级域名）
The part of a domain name directly left of the TLD (e.g., 'example' in example.com).
FQDN（完全限定域名）
Complete domain name with all labels from host to TLD (e.g., www.example.com.).
受限TLD
TLD that limits registration to eligible organizations or individuals.
基础设施 TLD（.arpa）
Special-purpose TLD (.arpa) reserved exclusively for DNS infrastructure and protocol use.
保留测试 TLD
IANA-reserved TLDs (.test, .example, .invalid, .localhost) guaranteed never to resolve in the public DNS.
TLD 运营商（注册局运营商）
Entity authorized by ICANN to administer all domain registrations within a specific TLD.
已委托 TLD
TLD formally added to the DNS root zone by IANA and resolvable on the public internet.
ASCII TLD
TLD composed entirely of ASCII characters, natively compatible with all DNS software without encoding.
开放型 TLD
TLD with unrestricted registration policies open to any person or entity worldwide.
社群 TLD
TLD designed to serve a specific community of interest with eligibility restrictions and community-aligned policies.
通用限制 TLD
Legacy gTLDs (.biz, .name, .pro) intended for specific uses but with limited enforcement of registration restrictions.
TLD 字符串
The proposed character sequence for a new TLD, evaluated by ICANN for similarity, geography, and conflicts.
品牌域名 TLD（.brand）
Company-operated new gTLD using a brand name as the extension, unavailable for public registration.