无点域名 - SegmentFault 思否

Dotless Domain Definition: Refers to top-level domains (like.com,.gov) reachable via web browser or email server, consisting of a single label (e.g., http://com/ vs. http://example.com/; contact@gov vs. [[email protected]]). If the domain's DNS zone has A/AAAA or MX records in its apex, it can be a dotless domain.
ICANN and IAB Stance: Both are against the practice. ICANN prohibits it on gTLDs but ccTLDs (country code TLDs) are under their own country's jurisdiction and there are historical examples of active dotless ccTLDs.
A or AAAA Records:
- Current: TLDs with apex A or AAAA records as of the last check (mostly since 2013). Examples include.bc,.cm,.tk,.uz,.ws, etc. with their respective IP addresses and HTTP/S status. Screenshots show the status at specific times.
- New TLDs: ICANN requires new TLDs to include a few apex DNS records for at least 90 days to prevent local aliases from colliding. Examples are.xn--ngbrx with specific IP and TXT records.
- Historical: TLDs that previously had apex records but no longer do. Examples like.ai,.bh,.dk, etc. with their past IP addresses and other details. Screenshots show past status.
MX Only Records:
- Current: TLDs with only MX apex records that could in theory send and receive email but have no reachable website. Examples are.cf,.gp,.gt, etc. with their email servers and first seen dates.
- Historical: Similar to above but for TLDs that previously only had apex MX records and no longer do. Examples like.ax,.dm, etc. with their email servers and known working dates.
Bonus: Dotless Dot: Top-level domains are nodes in the DNS tree like second-level domains. The root (represented by a single dot) is the parent of all TLDs and every domain terminates with a dot. In theory, accessing http://./ or emailing example@.* is possible but the odds are very nearly zero as the root doesn't have A, AAAA or MX records. Screenshot shows the status as of 3 Sep. 2023.