There isn't a fixed cap on the number of segments you can create on a list in Zoho Campaigns, and there's also no limit on the number of lists you can create in the first place.
A list is a static group of contacts that stays as-is until you manually add or remove people, or sync changes in. A segment is dynamic, automatically updating based on criteria you set, such as location, engagement, or contact field values, and shrinking or growing as contacts match or stop matching those criteria.
Segments used to only work within a single list, meaning if similar contacts were spread across several lists, you had to manually consolidate them into one list before segmenting. Zoho Campaigns has since added org-level segments, letting you bring together contacts sharing similar field values regardless of which list they originally belong to, without needing that manual consolidation step.