Sub Domain Registration with free DNS

Dear Sir / Madam

I am using with freeDns manager but i am not able to add any sub domain
 
i have aded an entry like below   = my.domain.com
         my      =>   CNAME  => my.domain.com
my.domain.com => A   = >  IP Address

but not working
when checking with leafdns reply is :  FAIL: The parent nameservers do not have your nameservers listed
please tell me how add a subdomain
Thank you

first off, is your domain setup to the proper nameservers at your registar.

ns1.centos-webpanel.com
ns2.centos-webpanel.com
ns3.centos-webpanel.com
ns4.centos-webpanel.com
ns5.centos-webpanel.com

Second, if they indeed are, it may take 24 hours after setting them at the registar to propogate, until that point, the old NS are still considered Authorative

Use this tool, and select NS for what to look for:  https://www.digwebinterface.com/


Proper formats are as follows:
my in A (IP)
my in CNAME @  // make sure you have an @ in A (IP)
my in CNAME mydomain.com

NOTE YOU tried my.domain.com in CNAME my.domain.com.  This could crash a named server. Don't ever do a looped lookup