When a site is set up, as the hosting provider we create a Master DNS record on our DNS servers, which updates any changes made to your DNS records on the server every 15 minutes.You can request that the registrar of the domain point to our DNS server as being the master authority of your domain. You have registered your domain name, uploaded your website to one of our web servers, and asked your registrar to either use our name servers or to point your "A" record to your web server's IP address. When your website's address is entered into a browser, the computer requests the IP address of the server housing your site from your s (ISP) DNS records. 2 days ago, I enabled BT parental controls as I wanted to try the filters out.Did not really like it, because it didn't allow me to also use Open DNS at the same time.Many of our KB (knowledge base) articles mention DNS propagation delay.You know you need to be patient as you wait for your site to become live to the rest of the world, but you also want to explore the possibility that a problem may exist, delaying the process even more.
It's handy because it you had to remember the IP address of every website you visit, it would make surfing the internet much harder.
When you update the DNS (Domain Name System) records in your domain name's zone file, it can take up to 48 hours for those updates to propagate throughout the Internet.
While we strive to make updates as quickly as possible, the DNS propagation time for your domain name depends on several factors that we cannot control.
I assume that the unique way to know is testing each DNS changing the TTL of a domain, is that correct? Many ISP's (mainly large ISPs) ignore the TTL's that your DNS server issues with DNS lookups.
The problem is that you will never be able to figure out exactly what DNS information each of your users is getting unless you specifically ask each and every of them, and hope that they know how to find it and give it to you.