Website not accessible through some ISP/Internet Connections

[luke]

Hi, @sicmundus, the reason is most commonly time to live values of the previous (not the current) DNS records:

[Support Guide] Why do DNS / SSL changes take up to 48 hours to propagate? (TTL)

Last reviewed by Netlify Support on August 2023 How do time to live (TTL) values affect changes to DNS records? People often ask why the changes to DNS (Domain Name System) records are not taking effect. The answer to this often involves a core mechanism of how DNS functions - the “time to live” (TTL) values for the DNS records themselves. This topic is here to answer those questions! ! If you’d prefer a TL:DR; in the form of a video, check this out: [WHAT IS PROPAGATION? - Netl…

If that isn’t the issue, would please let us know which domain name this is for?

If you can install dig for your local system, traced lookup of the record from a non-working ISP would be helpful:

dig example.com +trace

​Please let us know if there are questions or if TTLs are not the root cause.