Quick search of the google-webs, you can get MASN on TV NOW. I think it is the *only* streaming service that includes MASN. Must have been a recent addition to the lineup?

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Stream MASN Live on AT&T TV Now

AT&T TV Now packages start at $55 per month, but you’ll need the Max package for $80 per month to get access to RSNs. Along with local channels, both the Plus and Max packages come with ESPN, TBS, TNT, and FS1 for nationally aired games.

Here’s what you’ll get with an AT&T TV Now subscription:

7 day free trial
45+ channels
Up to 2 simultaneous streams
20 hours of DVR included