If you’ve changed DNS servers or moved websites, then it is a good idea to check the DNS look up for it.
DNS Checker is a free online for that.
Enter any DNS record query like A (hostname), CNAME, MX, PTR and check what values are being returned for them.
Often, when moving sites, there will be old as well as new DNS lookups, so this tool gives a good view of the propagation status. (More about DNS records and what they are can be found here).