First of all, if you are going to change any DNS records, if you don’t know who controls your Domain Name’s records, then you may need to find out who your Domain Name is registered with.
To do that use WHOIS. e.g. https://mxtoolbox.com/SuperTool.aspx Find and search a domain using WHOIS in the Orange Button dropdown.
Now the registrar may not be who actually controls your Domain Name’s records, as the Nameservers (the records below) dictate who actually controls your DNS settings which include your A record, CNAME records and records like eMail (MX records) and others including TXT and SPF records.
If the top nameserver is not your registrar’s nameserver, and or this may manifest itself in the event that when you make changes to the domain name’s DNS records (DNS Settings) nothing actually changes when you use DNS Lookup to check the A record or CNAME record, then you must then check who the Nameservers are managed by, and therefore where your DNS records are being managed from.
To do that, you can either already see that from the WHOIS record using MXtoolbox, or you can check without WhoIS info and then instead use MX Toolbox’s SuperTool and click the DNS Check orange button.
https://mxtoolbox.com/SuperTool.aspx
Enter the root domain and select DNS Check from the Orange dropdown button
So that deals with the registrar and nameservers, so now how do you check the status of your A records and CNAME records for your domain name and more importantly your www.domainname.XXX. The easiest way is to use MXTOOLBOX:
https://mxtoolbox.com/DnsLookup.aspx
With this Website you need to check using the Orange DNS Lookup Button, both the root domain e.g. webdadi.com as well as the subdomains e.g
www.webdadi.comto see both the A record (first) and the CNAME records (second) if you type the root domain name in first and the www in front of the domain second.
for the Root Domain normally this will be an A record’s IP Address
For the CNAME record (so any subdomain incl www.) this should say live.webdadi.net