Can we use same click tracking subdomain acorss multiple instances?

[shelliezollin]

We are adding new branding domain aliases to our Marketo Instances and we were wondering if we can use the same click tracking subdomain across all instances?

Example: click.domain.com to be used on 6 different instances.

Thanks!

[SanfordWhiteman · Accepted solution]

No. The branding domain click.example.com is a DNS Alias for a specific instance domain (mkto-1234.com).

You can’t have the same domain be an alias for multiple canonical domains.*

EDIT: Here's an official post on the topic: Why you can't use the same branding domain across multiple instances

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*Some non-standard DNS services allow more than one alias to be entered on the back end. They then return only one of those as the CNAME lookup response, either randomly or based on load. However, this only works for distributing  requests across servers with the same data. With click tracking, the result would be rampant errors as people would be randomly directed to a server that doesn’t understand the request.