Check how far a DNS record has propagated across major global resolvers.
When you update a DNS record (such as pointing your domain to a new server), the change does not take effect immediately everywhere. This is because DNS resolvers around the world cache records for a period defined by the TTL value.
To speed up propagation, lower your DNS record TTL to 300 seconds (5 minutes) before making changes. After the change is live and verified, you can increase the TTL back to a higher value like 3600 or 86400 seconds.