Key performance specifications of the DNS

Item	Value
Maximum number of resolution requests that can be processed per second	5,000
Maximum number of IP addresses that can be configured in an A record for a domain name	64
Maximum number of resource records in a zone	100,000
Maximum number of zones	10,000

Can you please let me explain that Maximum number of IP addresses that can be configured in
an A record for a domain name. 

documentation very useful for my job

Very sound........

useful document, thanks