I imagine that your routers have no difficulty in carrying a separate route
for each of your customers, so there's no need for you to get involved in
assigning them address prefixes. As for tracking the possible changes in
their prefixes, you (and your customers) will have to make that effort part of
the cost of your service. Whether it's easy or hard is still an open
question, partly hining (IMHO) on DNS choices to be made in the near future.
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