Vantage points

Compare internal and external views

Choose where a lookup runs — the server’s edge vantage, your own browser, or both side by side — to expose split-horizon differences.

When to use it

Use this when

  • Split-horizon DNS serves different answers inside versus outside your network.
  • You want to confirm a record resolves the same from a datacenter and from your laptop.

Steps

Do this

  1. Pick a vantageUse the Run from selector under the result area: Server uses Cloudflare’s edge, Your browser resolves directly via DoH, Hybrid picks automatically, and Both runs the pair.
  2. Compare both columnsIn Both mode dnsbin renders two result columns with an agree/differ banner so internal-vs-external gaps are obvious.
  3. Confirm reachabilityA client-side answer proves resolution works from your network specifically, not just from the edge.

Examples

Copyable commands

Deep link — both
https://dnsbin.ca/?tab=lookup&name=intranet.example.com&type=A&mode=both
Deep link — client only
https://dnsbin.ca/?tab=lookup&name=example.com&type=A&mode=client

Operational notes

Keep in mind

  • Client and Both modes only work for CORS-enabled resolvers (Cloudflare, Google, DNS.SB); other resolvers fall back to the server.
  • Composite tools (DNSSEC, Mail health, Discovery, Trace, Blocklist) always run server-side; mode applies to record lookups.
  • REST endpoints always execute on the server — client-side resolution is a browser feature of the web app.