650-453 phone numbers

Numbers 650-453-0000 to 650-453-9999 are assigned to Level 3 Communications, LLC (rate centre SNCRL-BLMT, CA, NANPA abbreviation). 8 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 650-453-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 650-453