How long will it take for changes to DNS to show up?
While everyone wishes changes to their DNS configuration appeared worldwide instantly, in practice, DNS can be slow to update.
Time it takes for a change to a Porkbun-hosted DNS record to update worldwide:
Modifications to an existing record take some time before they’re live everywhere. In order to save bandwidth, DNS servers will continue to serve out a “cached” or saved version of your old configuration until the “TTL” of those records runs out.
TTL is short for “Time To Live” or the maximum number of seconds a DNS server should ever cache your records, although some DNS servers ignore the TTL and cache for longer. Porkbun DNS allows a minimum TTL of 300 seconds, or five minutes. According to our tests, records set with a TTL of 300 propagate to about 50% of the Internet after one minute and 95% of the Internet after five minutes. To check the propagation of a DNS record change, you can use a DNS propagation checker such as https://www.whatsmydns.net/
Time it takes for a brand new DNS record to resolve worldwide:
Usually, when you add a new DNS record via Porkbun’s Domain Management console, it resolves everywhere moments after you click “add.” However, if you attempted to resolve an address that wasn't already in DNS before you added the record, name resolution may continue to fail on your computer (and yours alone) for a few hours due to a phenomenon known as "negative caching."