netlupaLook up a CNAME record
A CNAME makes one name an alias of another. Enter the subdomain (for example www.example.com) to see where it points.
What is a CNAME record?
The CNAME (Canonical Name) record makes one name an alias of another: when someone asks for www.example.com, DNS answers “that is the same as example.netlify.app” and the resolver continues with that name. That way, if the external service changes its IPs, you do not have to touch your DNS.
A name with a CNAME cannot have other records, which is why it cannot be used on the root domain (example.com); there you use A records or ALIAS/ANAME solutions offered by some providers.
Lookups by record type
Frequently asked questions
Why is there no CNAME on my main domain?
Because the root domain cannot have a CNAME: it needs its SOA and NS records. Look up the subdomain instead, for example www.
How long does a DNS change take to propagate?
As long as the old record's TTL: from a few minutes to 24 or 48 hours. Nameserver (NS) changes usually take longer, because the TTL of the delegation in the TLD is high.
What does NXDOMAIN mean?
That the name you looked up does not exist in DNS: the domain is not registered, has expired or was mistyped.
Which DNS servers does this tool ask?
No middleman: Netlupa runs its own resolver, which starts from the root servers and asks each domain's official DNS servers directly.
Can I do a reverse DNS lookup of an IP?
Yes: look the IP up with the API (/api/dns/ptr/8.8.8.8) or use the WHOIS tool to find out who it belongs to.
Why do I see a different value than in my DNS panel?
Because resolvers still have the previous value cached. Wait for the time shown in the TTL, or check that you edited the zone at the provider listed in the NS records: if the domain uses other DNS servers, changes in your panel have no effect.
What is a record's TTL?
The time, in seconds, other servers may keep the answer before asking again. 3600 is one hour. A low TTL makes changes show up sooner, at the cost of more queries.