Global DNS Propagation: How Anycast Resolvers, TTL Caching, and Root Servers Work in 2026
A DNS change is not a single worldwide switch. The authoritative server can answer with the new address immediately, while a resolver on another network keeps the previous answer until its cache expires. That gap is the propagation delay people see after they edit an A, AAAA, MX, CNAME, TXT, or NS record. The hierarchy that actually answers A recursive resolver does not store every name on earth. It walks a chain. Root servers point at the top-level domain. The TLD points at the domain's authoritative nameservers. Those nameservers hold the record you edited. Anycast lets many machines share one well-known...
By Seoffix Engineering
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