I administered my domain e.g www.abcd.com in Amazon Route53.
Everything works perfectly, except that when user type abcd.com without www, it won\'t get resolved.
Any idea? Thank
Yes, this record is called your "zone apex" -- the bigcompany.com address, not www.bigcompany.com. You can use an IP value there, or you can specify an "alias" and point it to an ELB.
(Note: Route53 does NOT like @ values for either the record name or value.)