EDNS Client Subnet: Why Google and Cloudflare Care About Your Location

EDNS Client Subnet: Why Google and Cloudflare Care About Your Location — a concise, practical guide focused on real-world admin scenarios. We skip jargon and show commands you can run today.

Quick intro

This section frames the core idea and when to use it. You’ll see how it affects latency, reliability, and security choices.

Hands‑on example

dig pingtoolnet.com A +trace
nslookup -query=TXT pingtoolnet.com 1.1.1.1

Checklist

1. Test from multiple resolvers (ISP, 1.1.1.1, 8.8.8.8) to spot caching issues.
2. When debugging, change one variable at a time.
3. Always record TTLs — they explain most ‘inconsistent’ DNS behavior.
4. Document changes with timestamps so you can line them up with resolver logs.
5. Prefer `dig` for advanced flags; keep `nslookup` for quick checks.