You need to set up the DNS first
don't forget domain-name DomainYouWantToLook.Up
Create the object network myobj
fqdn domain.com
Check its resolving correctly with show dns
Create the ACL as normal use the fqdn keyword to insert your fqdn object
Run a packet tracer as a test.
Full details here
https://supportforums.cisco.com/document/66011/using-hostnames-dns-access-lists-configuration-steps-caveats-and-troubleshooting
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