← Area code 534
534-321 phone numbers
Numbers 534-321-0000 to 534-321-9999 are assigned to Level 3 Communications, LLC in New Auburn, WI. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 534-321-1xxx, 534-321-2xxx, 534-321-3xxx, 534-321-4xxx, 534-321-5xxx, 534-321-6xxx, 534-321-8xxx, 534-321-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.