DEVELOPER UTILITIES
DNS Records Explorer
DNS decides whether a site is reachable at all, on which servers, and whether its email can be trusted. After a migration or a hosting change, a missing www record or a duplicate SPF record breaks things quietly. This explorer shows the records and flags the common mistakes.
- Checks the live page
- Public addresses only
- Free, no sign-up
- CheckA, AAAA and CNAME records for the host
- CheckWhether www resolves
- CheckNumber of name servers
- CheckOne SPF record, and a DMARC policy when the domain receives mail
Free
no sign-up
Live
fetched when you run the check
5 checks
what the tool looks at
30 a minute
checks per visitor, to keep it free
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HOW IT WORKS
How to use the DNS Records Explorer
A domain or host name.
Enter the domain without https://.
Check the address and www results first, then email.
After changing a record, check again once its TTL has passed.
WHAT IT CHECKS
What it looks at, and how to read it.
Every record returned by public DNS, and checks on what they mean for the site and its email.
What it checks
- A, AAAA and CNAME records for the host
- Whether www resolves
- Number of name servers
- One SPF record, and a DMARC policy when the domain receives mail
- CAA records
How to read the results
- IPv6 (AAAA) is good practice but not required.
- DMARC p=none only reports spoofing; quarantine or reject stops it.
GOOD TO KNOW
Common mistakes, an example and the limits.
Common mistakes
- Adding a second SPF record for a new email tool instead of merging it into the first.
A worked example
After moving hosts, the apex points to the new server but www still has the old provider’s CNAME, so half the visitors see the old site.
Limitations
- Shows what a public resolver returns now; changes can take up to the records’ TTL to reach everyone.
- Does not list every subdomain; DNS does not offer that.
FAQ
Questions about the DNS Records Explorer
Straight answers about what it does and where its limits are.
Does DNS affect SEO?
Indirectly: if DNS fails or is slow, crawlers cannot reach the site, and migrations with DNS mistakes lose traffic.
Need this for a whole website, over time?
The NdovuSEOLabs platform connects your own Search Console, analytics and server logs, and audits every page on a schedule.