Current TXT record–based Domain Verification (DV) carries structural limitations that affect both performance and privacy. We analyze these issues and propose DVF — a new Domain Verification Filter mechanism.
Each service requires its own TXT record, causing DNS responses to exceed the UDP limit (512B), triggering TCP fallback and unnecessary overhead.
DV tags in TXT records reveal which services a domain uses, acting as an oracle for attackers and enabling targeted exploitation.
DVF consolidates existing DV TXT records into a single filter record, reducing DNS response size to prevent TCP fallback while blocking technology stack exposure — improving both efficiency and security simultaneously.
| # | DV Tag | Provider | DV Regex | Cadence |
|---|
example.com · http://example.com · https://example.com treated identically · Press Enter to searchEnter a domain to look up TXT records