Glossary
DNS
TLD
Top-level domain — the rightmost label of a name, such as .com or .uk. Each is operated by a registry under contract or delegation.
Defined in RFC 1034 §3.1.
Where this appears
The lessons that use this term, and what each is for.
DMARC PractitionerThe Public Suffix ListDerive an organisational domain the way a receiver does, and spot where that goes wrong.Domain Security FundamentalsThe hierarchy, and who the three parties areSay who controls each level of a domain name, and which of them you can call.Brand ProtectionRegistration feedsSay what a newly-registered-domain feed sees, how late it sees it, and what it never sees.Brand ProtectionWhen nobody answersEscalate an ignored report through the routes that exist, and know when to stop.