Which record types does it explain?

A, AAAA, CNAME, MX, TXT, SRV, NS, SOA, CAA, PTR, HTTPS/SVCB. The ones that appear in real DNS zones.

Does it validate syntax?

Yes — MX records need a priority + target, SRV needs priority+weight+port+target, etc. The tool flags malformed records with specific errors.

What about TXT records?

Parsed and explained. Common uses: SPF, DKIM, DMARC, domain verification for various SaaS. The tool recognizes the patterns.

Can I fetch records live?

Paste records you've gathered from dig/nslookup. This tool doesn't query DNS — that would need a server-side proxy for CORS reasons.

DNS Record Explainer | DevTools Surf

DevTools Surf

Example: DNS Record Explainer

A worked example, rendered from real sample data. Sign in to run the tool on your own input.

Input

CNAME

Output

═══ CNAME record ═══
Purpose: Aliases one name to another; resolvers restart the lookup at the target.
RDATA format: <target-fqdn>
Example: blog.example.com. 3600 IN CNAME hosting.example.net.

─── Gotchas ───
• A name with a CNAME may hold no other records (RFC 1034).
• Never place a CNAME at the zone apex — use ALIAS/ANAME or a provider flattening feature.

About DNS Record Explainer

DNS Record Explainer preview - Networking tool

Explain A, AAAA, CNAME, MX, TXT, SRV and other DNS records. Part of the DevTools Surf developer suite. Browse more tools in the Networking collection.

Use Cases

Understanding DNS records when configuring a new domain
Learning the difference between A, AAAA, and CNAME records
Setting up MX records correctly for email service providers
Debugging TXT record syntax for SPF and DKIM email authentication

Tips

Look up any record type to see its purpose and format
Understand MX priority values for email routing configuration
Learn when to use CNAME vs A records for domain setup

Fun Facts

The DNS was invented by Paul Mockapetris in 1983 (RFC 882 and 883) to replace the single HOSTS.TXT file maintained by SRI International.
The original HOSTS.TXT file required manual updates and was distributed via FTP; by 1983 it had become unmanageable with the growing internet.
The longest allowed DNS name is 253 characters total, with each label limited to 63 characters, as defined in RFC 1035.

FAQ

Which record types does it explain?: A, AAAA, CNAME, MX, TXT, SRV, NS, SOA, CAA, PTR, HTTPS/SVCB. The ones that appear in real DNS zones.
Does it validate syntax?: Yes — MX records need a priority + target, SRV needs priority+weight+port+target, etc. The tool flags malformed records with specific errors.
What about TXT records?: Parsed and explained. Common uses: SPF, DKIM, DMARC, domain verification for various SaaS. The tool recognizes the patterns.
Can I fetch records live?: Paste records you've gathered from dig/nslookup. This tool doesn't query DNS — that would need a server-side proxy for CORS reasons.

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