Free Website DNS Lookup

What does a DNS lookup show?

A DNS lookup asks the Domain Name System which IP addresses a hostname points to. A records hold IPv4 addresses and AAAA records hold IPv6 addresses. If they are wrong or missing, browsers and search engine crawlers cannot reach your site at all, which is why DNS is the first thing to check after moving hosts or changing a CDN.

How to use the Website DNS Lookup

Enter a domain or hostname, such as example.com or www.example.com.
The tool resolves its A and AAAA records from our server.
Compare the addresses with the ones your host or CDN gave you.

How to read the results

Passed: The hostname resolves to at least one IPv4 address and also has an IPv6 address.
Informational: The hostname resolves over IPv4 only. This is reported for information and does not lower your score: the site works for nearly everyone.
Failed: The hostname does not resolve, so nobody can reach the site at this name.

Why does my site point to the old server after a move?

DNS answers are cached for the record’s TTL (time to live). If the old record had a TTL of 86,400 seconds, some resolvers keep the old address for up to a day. Lower the TTL a day before a migration, change the record, then raise it again afterwards.

How do I make www and the bare domain both work?

Give both names a record (often a CNAME for www pointing at the bare domain or your CDN), then 301-redirect one to the other so search engines see a single version of the site.

DNS zone

example.com.      300  IN  A      203.0.113.10
example.com.      300  IN  AAAA   2001:db8::10
www.example.com.  300  IN  CNAME  example.com.

Frequently asked questions

Does DNS affect SEO?

Indirectly. Slow or failing DNS makes pages slow or unreachable, and if Googlebot repeatedly cannot resolve your hostname it crawls less. Search Console reports DNS errors under crawl stats.

Why do different tools show different IP addresses?

CDNs answer with the nearest edge server, so the address depends on where the lookup is made from. That is normal.

Do I need IPv6?

It is not required for SEO. It is good practice and most CDNs enable it for free.

Sources

What this tool checks

DNS resolves (with IPv6)
Reports the A/AAAA records for the host and whether IPv6 is available.
Why it matters: IPv6 support broadens reachability. Missing AAAA records are common and low-impact but worth knowing.
If it fails: Consider adding AAAA (IPv6) records if your hosting supports it.
Source: developers.google.com/search/docs/crawling-indexing/managing-crawl-budget