DNS Record Inspection & RFC 8484 Architecture: Technical Guide
The Domain Name System (DNS) is the critical decentralized directory that translates human-readable hostnames (such as freeqube.com) into network-routable IP addresses. Our DNS Record Inspector queries authoritative root nameservers using DNS-over-HTTPS (DoH).
1. How It Works: Cryptographic DNS-over-HTTPS (RFC 8484)
Traditional DNS queries are transmitted unencrypted over UDP port 53, leaving them vulnerable to ISP eavesdropping and Man-in-the-Middle (MitM) cache poisoning. Free Qube executes queries via RFC 8484 DNS-over-HTTPS JSON endpoints:
- A Records: Resolves canonical 32-bit IPv4 host addresses.
- AAAA Records: Resolves native 128-bit IPv6 host addresses.
- CNAME Records: Inspects canonical alias redirects and CDN edge routing paths.
- MX Records: Queries priority-weighted mail exchange servers for email delivery.
- TXT Records: Validates domain ownership, SPF email policies, DKIM keys, and DMARC enforcement.
2. Step-by-Step Tutorial
- Enter Domain Name: Type any valid apex domain or subdomain (e.g.,
example.comormail.example.com). - Select Record Type: Choose A, AAAA, CNAME, MX, or TXT from the record selector.
- Execute Query: Click "Lookup" to dispatch an encrypted DoH query.
- Inspect TTL & Data: Review the Time-To-Live (TTL) cache expiration and raw record payloads in the response table.
3. Technical Specifications
| Protocol Standard | RFC 8484 (DNS Queries over HTTPS) with TLS 1.3 encryption |
|---|---|
| Resolver Backbone | Direct Google Public DNS / Cloudflare 1.1.1.1 upstream resolvers |
| Supported Records | A, AAAA, CNAME, MX, TXT, NS, SOA, CAA |
| Cache Transparency | Displays authoritative TTL (Time-To-Live) seconds remaining |
4. Frequently Asked Questions (FAQ)
What is DNS Propagation and why does it take up to 48 hours?
When you update DNS records at your registrar, worldwide caching resolvers store old records until their TTL (Time-To-Live) expires. Full worldwide propagation can take from a few minutes to 48 hours.
What does an MX record priority number mean?
MX priority numbers determine routing order (e.g., 1, 5, 10). Sending mail servers always attempt delivery to the lowest priority number first, using higher numbers as fallbacks.
Can I check SPF and DKIM records with this tool?
Yes! Query TXT records to view your domain's SPF (v=spf1 ...) configuration and verify email deliverability settings.
Diagnostic Privacy Guarantee: Network checks are performed strictly between your browser and verified public endpoints. No personal browsing telemetry is ever stored or monetized.