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Q: What is a "CNAME" record and when would I need to use it?
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A: CNAME records, short for "Canonical Name", allows you to create alias names to existing Internet host records. CNAME records are helpful when pointing multiple domain names to the same host.
For example, www.janesbagels.com, creates the host name europe.janesbagels.com for her European factory. The company wants to market specific branded addresses like scotland.janesbagels.com, ireland.janesbagels.com, and greatbritian.janesbagels.com. Creating CNAME records for Scotland, Ireland, and Great Britain to alias Europe allows the company to easily create new names for the same host.
NOTE: Be careful using CNAME records. Only persons highly familiar with DNS should attempt to use CNAMES, or you could create routing problems for all of your DNS information including your website and email.