dns health check

Is your domain's DNS healthy?

We query each name server individually to check delegation, NS consistency, SOA, MX, SPF, DMARC, DKIM, CAA and DNSSEC — and show what to do about every issue.

The domain you check and your IP address are logged for 30 days for service security. Each IP address can run 30 checks per day; repeat checks of the same domain within 5 minutes are served from cache.

Test your own emails: do they land in spam?Send an email to your personal test address and get a score out of 10 based on SPF, DKIM, DMARC, reverse DNS, blacklists and content checks. Deliverability test → Received a suspicious email?Paste the email header and instantly see who really sent it and its SPF/DKIM/DMARC results. Header analyzer →

frequently asked questions

About the DNS check

What do you check?

The domain's registration at the parent servers (e.g. .com, .de), whether all name servers work and answer authoritatively, NS and SOA consistency, open recursive DNS, the MX servers (reverse DNS, blacklists, port 25), SPF/DMARC/DKIM/MTA-STS records, www, CAA and DNSSEC.

What is a "lame delegation"?

It means a server listed as a name server for your domain does not give authoritative answers for it. It usually happens when an old name server stays on the list after a hosting change, and it causes your domain to fail to resolve from time to time.

I got an error. What should I do?

Each item shows a suggested fix. Most fixes are made in your registrar's panel or at your DNS provider. For support, contact Tekur.