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DNS lookup: check a domain's DNS records

DNS is the internet's address book: it turns your domain into the IP of the server that hosts your site and says where your email goes. Enter a domain to see all its records, whether its email is protected against spoofing and where it's hosted.

What to check first

An SPF and a DMARC that work

If you use Google Workspace for email, this SPF is enough: v=spf1 include:_spf.google.com ~all. If your domain never sends email: v=spf1 -all. Only one SPF record per domain: two cancel each other out.

To start with DMARC, create a TXT record at _dmarc.yoursite.com with v=DMARC1; p=none; rua=mailto:you@yourmail.com. You'll get reports; once you see your legitimate email passes, switch to p=quarantine and then p=reject.

Domain fine but the site isn't on Google? Check whether Google can get in with the robots.txt tester and the redirect checker.

Frequently asked questions

I changed my DNS and don't see the change. Why?

Every record has a TTL (in seconds): how long others may keep the old value cached. With a TTL of 3600, the change can take up to an hour to show everywhere; up to 48 hours if you changed the NS servers.

Is this a DNS propagation checker?

No. We query one resolver and show what it answers right now. A propagation checker asks dozens of resolvers around the world. If our answer already shows the new value and a visitor still sees the old one, it's their cache: wait for the TTL.

What is an A record?

The one that says which IP your site lives on. Without an A (or AAAA) record, typing your domain leads nowhere.

What is SPF and why does it matter?

A TXT line that says which servers may send email for your domain. Without SPF anyone can send email “from” your business, and your legitimate email lands in spam more often.

And DMARC?

It tells Gmail, Outlook and Yahoo what to do with email that fails SPF or DKIM: nothing (p=none), send it to spam (quarantine) or reject it (reject). Since 2024, Gmail and Yahoo require it from bulk senders.

Does DNS affect SEO?

Indirectly: slow DNS makes the site slower, failing DNS takes it off Google for a while, and a missing www loses visits.

Getting Google to see you is step one. Step two is getting found.

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