Tatango allows users to create segments to send messages to specific subscribers. However, if you want to see the number of subscribers in each of your segments, you will need to download your subscriber list.
Click Reports in the upper right.
Under List, select Subscriber Report.
Choose the List you want the report for, select the desired Subscriber Statuses and the Date Range needed. Click "Run Report".
The file will contain the following information:
Unsubscribed date (if applicable)
Consecutive Bounced Messages
Any defined custom fields