Nameserver resilience · Vietnam (domains)

What share of domains in Vietnam have all nameservers on a single provider?

99.39%

99.39% of domains in Vietnam (95% CI 96.61–99.89%), measured across 163 domains on 2026-10-01.

multi-provider: 0.61%single provider: 99.39%
multi-provider · 0.61%single provider · 99.39%
Trend

Measured every Tuesday since 2026-08-01 — 10 observations to date. Last measured 2026-10-01.

How this is measured

Tier 0. NS lookup, map each host to a provider, count distinct providers. Denominator: any.

Passive measurement: a single DNS lookup, TLS handshake, or homepage GET per domain. Aggregate-only; no individual company is named. 95% Wilson confidence intervals. Population: domains sampled from the Common Crawl web graph, filtered to those that do email. Parked domains excluded. Snapshot: common-crawl-domain-stratified-c400-g2500-seed20260729.

Licensed CC BY 4.0 — reuse with attribution to Quiet Failures. Download: JSON · CSV.

Check a specific domain against this control with the free Email authentication audit.

Why it matters

Single-provider DNS is a single point of total failure — when that provider has an outage the domain disappears entirely (web, mail, everything). Redundancy here looks present ("we have four nameservers") while all four share one fate.

Limits of this measurement

Low severity; single-provider is a reasonable choice for a small company, so this is context on concentration risk rather than a defect.

The same check, other segments

Show the remaining 65 segments

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