Subsector 4534 was a region of space in Sector 450.
Prior to stardate 41775, the USS Ganymede and the USS Puget Sound, were ordered to avoid this subsector. That order had been supported by Admiral Marcia Meldal-Johnsan and dealt with diplomatic negotiations with the New Zealand government. Both starships were to acknowledge this order on subspace com net security code 045, code 100 alpha. (TNG: "Conspiracy")