Even though Marketo hosts your landing pages, the URL can be totally customized.

What it looks like without a CNAME:

http://na-sj02.marketo.com/lp/mktodemoaccount126/UnsubscribePage.html

The way it should look:

 http://go.YourCompany.com/UnsuscribePage.html

Choose a CNAME

Pick a word to go at the beginning of the URL for your landing pages.  It's just one word and should be relatively short.  Examples:

The one word (plus YourCompany.com) is called a CNAME.  You will need this later so make a note of it.


Find your Account String

Go to the Admin area and click on Landing Pages.
Under the Landing Pages tab, copy the Account String from the Settings section.
 
You will need later also, so make a note of it.

Send Request to IT

Ask your IT staff to setup the following CNAME: (Replace the word [CNAME] and [ACCOUNT STRING] with the text from the previous step.)

[CNAME].YourCompany.com > [ACCOUNT STRING].mktoweb.com

Complete CNAME Setup

Once your IT has created the CNAME, go to Admin and click on Landing Pages.

Under the Settings section, click on Edit.
Enter your CNAME in Domain name for Landing Pages, enter your Fallback page, enter your Homepage and click Save. 

Your fallback page will be the page leads will get redirected to if your Marketo Landing Page is unavailable.

Nice job! Your landing pages are now branded with your company domain.