Is my dns setup correctly? (www.) /var/named/domain.hosts dump

Code: 
$ttl 38400
mydomain.com.	IN	SOA	mydomain. email.mydomain.com. (
			1118517262
			10800
			3600
			604800
			38400 )
mydomain.com.	IN	NS	mydomain.
ns1.mydomain.com.	IN	A	111.222.333.444
ns2.mydomain.com.	IN	A	111.222.333.444
mydomain.com.	IN	A	111.222.333.444
ns1.mydomain.com.	IN	NS	111.222.333.444
ns2.mydomain.com.	IN	NS	111.222.333.444
www.mydomain.com.	IN	A	111.222.333.444
testing.mydomain.com.	IN	A	111.222.333.444
Is this setup correctly? Because sometimes I can ping the mydomain.com and not www.mydomain.com ?

This is a dump from /var/named/mp3realm.hosts

I am using Bind 9

 

 

 

 

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