Whenever DNS or Domain Name Server records are modified, propagation steps in. DNS propagation can take anywhere between 24 to 48 hours and during this time the DNS IP will fluctuate. This means that your website visitors may land on your old or new website.
There is a way that you can check the current state of your DNS records during propagation. Check out the following free tools to check DNS Propagation
1. DNS Checker : You can run a DNS propagation check from more then 20 locations worldwide. Record types like A, AAAA, CNAME, MX etc are supported by this tool.
2. Site24x7 : This tool lets you check for DNS propagation from more than 50 locations and also allows you to customize location checking.
3. WhatsMyDNS : You can check DNS propagation from 21 locations and supports multiple record types.
That’s it folks, hope these tools help.