Azure DNS quick question

Hi all, started looking at Azure and have a question on DNS and Azure - probably a no-brainer for someone.

So, here i am with my website contoso.com on the internal parameter registered on some ISP with traffic hitting a device on my external facing dmz and channelling request to the internal web site.

I move contoso.com to Azure (nothing left on site).

How does traffic get routed to the site now in Azure if that site now has the MSFT azure dns name appended to it?

Thank you.

Adding edit because i can ask it better.

I guess what i meant to ask was this. When contoso.com is onsite it will have an IP address. When i move it to Azure, that IP address will change. Who takes care then of making sure that the DNS record - the IP address change is registered on the internet?
Hopefully that makes a little more sense.
LVL 1
Jay ThomasAsked:
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Pushpakumara MahagamageVPCommented:
please follow the instruction in MS article

https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain

let me know if you need any more help.
footechCommented:
Do you manage your own public DNS records?
The best scenario is if the hosting of any website and the provider of your public DNS records are completely separate.  No matter where your site is hosted, you make sure that it is reachable via a public IP.  Then you log on to your DNS provider's interface and create or change an A record so that whatever name you want to use for your site points to the public IP.

That's the simplest scenario.
Depending on how the site is hosted, the requirements for the DNS record could change, and in that case, the web site host should provide you with exactly the information you need on what type of record to create and where it should point.

Azure is a big thing, and I'm not familiar with all of it.  If all you're doing is essentially setting up a VM in Azure, and then configuring that VM to host a site, the same way that you would configure a VM or physical machine on your own network (this is Infrastructure as a Service, IAAS), then you add a public IP and attach it to the VM.

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Jay ThomasAuthor Commented:
Thank you both. The URL is good cos i ran through the process. Footech's explanation was exactly what i was looking for, it's how i move my website that already has a public name provider with an IP address, and how then if i want to move that website to Azure, which i do,  how the routing is handled. There's some great stuff on Azure at MSFT, but you read one link and another and before you know it you have tons of the stuff to read :)

If anyone knows of any great training resource please feel free to ping my way except Plural Site, I find they are 18 months behind when it comes to Azure - just my personal opinion :)
Pushpakumara MahagamageVPCommented:
You are welcome.
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