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[Azure App Service](overview.md) provides a highly scalable, self-patching web hosting service. This guide shows you how to map an existing custom Domain Name System (DNS) name to App Service. To migrate a live site and its DNS domain name to App Service with no downtime, see [Migrate an active DNS name to Azure](manage-custom-dns-migrate-domain.md).
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[Azure App Service](overview.md) provides a highly scalable, self-patching web hosting service. This guide shows you how to map an existing custom Domain Name System (DNS) name to App Service. To migrate a live site and its DNS domain name to App Service with no downtime, see [Migrate an active DNS name to Azure App Service](manage-custom-dns-migrate-domain.md).
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The DNS record type you need to add with your domain provider depends on the domain you want to add to App Service.
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| Scenario | Example | Recommended DNS record |
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| - | - | - |
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| Root domain | contoso.com |[A record](https://en.wikipedia.org/wiki/List_of_DNS_record_types#A). Don't use the CNAME record for the root record. (For information, see [RFC 1912 Section 2.4](https://datatracker.ietf.org/doc/html/rfc1912#section-2.4).) |
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| Subdomain |www.contoso.com, my.contoso.com |[CNAME record](https://en.wikipedia.org/wiki/CNAME_record). You can map a subdomain to the app's IP address directly with an A record, but it's possible for [the IP address to change](overview-inbound-outbound-ips.md#when-inbound-ip-changes). The CNAME maps to the app's default hostname instead, which is less susceptible to change. |
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| Root domain | contoso.com |[A record](https://en.wikipedia.org/wiki/List_of_DNS_record_types#A). Don't use the CNAME record for the root record. (For information, see [RFC 1912, section 2.4](https://datatracker.ietf.org/doc/html/rfc1912#section-2.4).) |
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| Subdomain |www.contoso.com, my.contoso.com |[CNAME record](https://en.wikipedia.org/wiki/CNAME_record). You can map a subdomain to the app's IP address directly with an A record, but it's possible for [the IP address to change](overview-inbound-outbound-ips.md#when-inbound-ip-changes). The CNAME maps to the app's default hostname instead, which is less susceptible to change. |
@@ -121,7 +121,7 @@ For a wildcard name, like `*` in `*.contoso.com`, create two records, as describ
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| Record type | Host | Value | Comments |
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| - | - | - | - |
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| CNAME |`*`|`<app-name>.azurewebsites.net`. (See [the note at start of this article](#dnl-note).) | The domain mapping itself. |
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| CNAME |`*`|`<app-name>.azurewebsites.net`. (See [the note at the start of this article](#dnl-note).) | The domain mapping itself. |
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| TXT |`asuid`| The domain verification ID shown in the **Add custom domain** dialog. | App Service accesses the `asuid` TXT record to verify your ownership of the custom domain. |
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@@ -139,7 +139,7 @@ For a wildcard name, like `*` in `*.contoso.com`, create two records, as describ
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:::image type="content" source="./media/app-service-web-tutorial-custom-domain/configure-custom-domain-add.png" alt-text="A screenshot showing the Add button activated after validation." border="true":::
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> [!NOTE]
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> If you configured the TXT record but not the A or CNAME record, App Service treats it as a [domain migration](manage-custom-dns-migrate-domain.md) scenario and allows the validation to succeed, but you won't see green check marks next to the records.
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> If you configured the TXT record but not the A or CNAME record, App Service treats the change as a [domain migration](manage-custom-dns-migrate-domain.md) scenario and allows the validation to succeed, but you won't see green check marks next to the records.
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1. You should see the custom domain added to the list. You might also see a red X and the text **No binding**.
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