ERR_NAME_NOT_RESOLVED: The hostname could not be resolved
Also searched as: net::ERR_NAME_NOT_RESOLVED · name not resolved · cannot resolve host
Is ERR_NAME_NOT_RESOLVED happening on your domain?
Resolving the name from outside your machine shows whether public resolvers can find a record, helping distinguish a public DNS issue from a local resolver or network problem.
Free, no signup. Runs from outside your network, which is the only way to tell a server fault from a local one.
Short answer
Chrome could not turn the hostname into an IP address. Closely related to NXDOMAIN but broader: it also covers resolver failures and timeouts, not just definitive 'does not exist' answers.
What ERR_NAME_NOT_RESOLVED means
This is the browser-level version of a DNS failure. It fires whether the resolver returned NXDOMAIN, timed out, or was unreachable, so the first diagnostic step is establishing which of those happened.
Causes and fixes, most likely first
No DNS record exists for the hostname.
Add the A or CNAME record. Check apex and www separately.
The configured DNS resolver is unreachable or failing.
Switch the device to a public resolver temporarily. If everything resolves again, the original resolver is the fault.
A VPN or split-DNS setup is routing lookups to an internal server without this record.
Disconnect the VPN and retry. Split-DNS configurations routinely break public hostname resolution.
A local hosts-file entry or DNS-blocking extension is intercepting the name.
Check the hosts file and disable ad-blocking or DNS-filtering extensions, then retry in a private window.
ERR_NAME_NOT_RESOLVED on specific platforms and devices
How to stop it happening again
- •Monitor resolution from multiple public resolvers so a single provider's failure is visible before users report it.
- •Alert on NS and A record changes.
Frequently asked questions
What is the difference between ERR_NAME_NOT_RESOLVED and NXDOMAIN?
NXDOMAIN is a definitive answer that the name does not exist. ERR_NAME_NOT_RESOLVED is Chrome's broader failure, which also covers resolver timeouts and unreachable DNS servers.