DNS lookup
DNS is the address book of the internet. Every time someone opens your website, their device asks DNS which server the domain points to. This tool asks the same question from our server and shows you every record it gets back.
Use it to confirm that a change you made at your domain provider has gone live, to find out where a domain is hosted, or to check the mail and verification records a service asked you to add.
How to read the results
- A and AAAA are the server addresses (IPv4 and IPv6) the domain points to.
- CNAME makes one name an alias of another, which is common for www and for hosted services.
- MX lists the mail servers, with a priority number. The lowest number is tried first.
- NS are the name servers that hold the domain’s records.
- TXT holds text such as SPF email rules and site verification codes.
- TTL is how many seconds other servers may keep an answer before asking again.
Questions
Why does a record I just changed not show up?
DNS answers are cached for the length of their TTL, so an old answer can linger for minutes or hours. Our DNS propagation guide explains how long to wait.
Why are some record types empty?
A domain only has the records its owner has set up. A site often has no CNAME, and a domain with no email has no MX records.
Does this lookup show my own DNS cache?
No. It asks DNS from our server, so you see the live answer rather than whatever your own device has stored.
Related guides
More free tools
- HTTP header checker
- SSL certificate checker
- Redirect checker
- WHOIS and domain expiry
- MX record lookup
- Robots.txt checker
- Security headers checker
Results are a snapshot taken from our servers at the moment you ask, and can differ from what you see elsewhere. siteupdown.com tests public websites only. Spotted a problem?