Number of Vlan's supported on cisco switches
In general old 2950 switches will support upto 64 vlans and newer 2960 switches will support upto 255 vlans.
When we talk about 64 and 250 vlans it does not mean that you cannot create more than 64 vlans it just means that only 64 vlans will be having per vlan spanning tree instance.
For example 2950 as a VTP client will learn all normal-range VLANs, with VLAN IDs 1 to 1005; VLAN IDs greater than 1005 are extended-range VLANs and are not stored in the VLAN database. The switch must be in VTP transparent mode when you create VLAN IDs from 1006 to 4094.
Again mostly all switches support normal vlans upto 1005 but if we talk of per vlan spanning tree it depends on hardware and also on image it is running.
Like 2950 running standard image only supports 64 per vlan spanning tree and 2950 with enhance image supports upto 250 per vlan spanning tree instance but still both will let you create more than 64 and 250 vlans just that per vlan spanning tree instance will be only supported on 64 and 250 vlans depending upon image they are running.
And in this situation when you have more than 64 vlans on switch running standard image it is recommended not to run PVST+ but to confiure MST.
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