@shantanu:
There is no one font for any other network. Zee is the only one with the same font (Gotham) for all channels.
In Star, Star Plus/Star Jalsha/Star Pravah use 'Fedra Sans Alt', Star Gold uses 'Century Gothic', Star Gold Select uses 'Nexa', etc. So all the channels have their own font. However, with Zee, Gotham is used by all the channels.