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← Area code 412

412-336 phone numbers

Numbers 412-336-0000 to 412-336-9999 are assigned to Level 3 Communications, LLC (rate centre PTTSBGZON4, PA, NANPA abbreviation). 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 412-336-0xxx, 412-336-1xxx, 412-336-4xxx, 412-336-5xxx, 412-336-9xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 412-336