NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 650
ONVOY, LLC - CA 2
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 650-496 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-497 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-498 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PALO ALTO CA
— 650-500 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 6906 SNCRL-BLMT CA
— 650-503 0XXX1XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J REDWOOD CY CA
— 650-504 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-506 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-508 not yet reported which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 650-513 0XXX1XXX2XXX6XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-515 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-516 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PACIFICA CA
— 650-517 0XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNCRL-BLMT CA
— 650-520 2XXX which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-522 0XXX3XXX · 2 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-523 not yet reported which blocks → ONVOY, LLC - CA 649C SAN MATEO CA
— 650-524 5XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-525 2XXX4XXX6XXX · 2 holders which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-526 1XXX2XXX4XXX8XXX · 4 holders which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-527 not yet reported which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-528 2XXX which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-529 4XXX5XXX6XXX7XXX · 4 holders which blocks → PACIFIC BELL 9740 WOODSIDE CA
— 650-530 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 WOODSIDE CA
— 650-532 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SAN MATEO CA
— 650-533 none assigned yet which blocks → METROPCS, INC. 5562 SAN MATEO CA
— 650-534 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SSNFRNCSCO CA
— 650-535 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J MOSS BEACH CA
— 650-537 2XXX3XXX4XXX5XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MT VIEW CA
— 650-538 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PESCADERO CA
— 650-539 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-542 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-543 not yet reported which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PALO ALTO CA
— 650-544 2XXX which blocks → T-MOBILE USA, INC. 6529 SAN MATEO CA
— 650-545 not yet reported which blocks → NORTH COUNTY COMMUNICATION CORPORATION - CA 7894 MT VIEW CA
— 650-548 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-549 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDWOOD CY CA
— 650-550 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 SNFC JUNPR CA
— 650-551 9XXX which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-552 3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 MILLBRAE CA
— 650-553 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-554 0XXX1XXX8XXX9XXX which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST CA
— 650-556 3XXX4XXX5XXX6XXX which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-557 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 PACIFICA CA
— 650-558 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-559 4XXX6XXX which blocks → PACIFIC BELL 9740 LOS ALTOS CA
— 650-560 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PACIFIC BELL 9740 HALFMOONBY CA
— 650-561 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-562 5XXX6XXX7XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-563 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 MOSS BEACH CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.