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Custom Domain is a fully-managed service that enables you to configure a first-party subdomain over HTTPS. You can then track event requests through your own domain (for example,`cdp.mydomain.com`), instead of the default (`segment.com`). Tracking events through your own domain allows for more secure and complete first-party data collection by reclaiming first-party data lost to browser controls. With a more complete view of your customer behaviors, you can build more robust profiles for greater attribution and ROAS.
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Custom Domain is a fully-managed service that enables you to configure a first-party subdomain over HTTPS. You can then track event requests through your own domain (for example,`cdp.mydomain.com`), instead of the default (`segment.com`). Tracking events through your own domain allows for more secure and complete first-party data collection by reclaiming first-party data lost to browser controls. With a more complete view of your customer behaviors, you can build more robust profiles for greater attribution and ROAS.
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You cannot use Custom Domain setup for Analytics.js CDN or Tracking API with device-mode destinations because device-mode destinations require that the destination’s native scripts are loaded onto the client, and the requests are sent directly to the destination.
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>info "Custom Domain is only available to Business Tier customers"
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>Customers not on the Business Tier but who have interest in Custom Domain should[contact Segment's sales team](https://segment.com/demo/){:target="_blank”} for assistance with upgrading to a Business Tier plan. Segment also offers an alternative DNS record service,[Custom Proxy](/docs/connections/sources/catalog/libraries/website/javascript/custom-proxy/).