Yes, but you can use [0-3].$vendor.pool.ntp.org. You simply request a "vendor zone" once, beforehand, and use it all you want. Apparently Lennart is opposed to

Yes, but you can use [0-3].$vendor.pool.ntp.org. You simply request a "vendor zone" once, beforehand, and use it all you want. Apparently Lennart is opposed to that part of the process, however.