Class B subnetted into Class C address space.

Assuming 129.65.0.0 /16
Would give you
  • 129.65.0.0 /24
    129.65.1.0 /24
    129.65.2.0 /24
    129.65.3.0 /24
    ...
    129.65.255.0 /24


At which point you can then further subnet your class C address space.

Example 129.65.65.0 /24
  • 129.65.65.0 /30
    129.65.65.4 /30
    129.65.65.8 /30
    129.65.65.12 /30
    ...
    129.65.65.255.252 /30
    [\list]
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Today is the tomorrow you worried about yesterday.