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
— 650-419 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA HONDA CA
— 650-421 0XXX1XXX3XXX5XXX6XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J REDWOOD CY CA
— 650-423 not yet reported which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 REDWOOD CY CA
— 650-424 none assigned yet which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-425 0XXX1XXX3XXX7XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAN MATEO CA
— 650-426 0XXX1XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MT VIEW CA
— 650-428 not yet reported which blocks → PACIFIC BELL 9740 MT VIEW CA
— 650-429 6XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 MT VIEW CA
— 650-432 not yet reported which blocks → PACIFIC BELL 9740 SAN MATEO CA
— 650-433 2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PALO ALTO CA
— 650-434 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J WOODSIDE CA
— 650-443 5XXX6XXX7XXX8XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J MILLBRAE CA
— 650-444 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PALO ALTO CA
— 650-446 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E WOODSIDE CA
— 650-449 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC JUNPR CA
— 650-451 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PACIFICA CA
— 650-452 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 SSNFRNCSCO CA
— 650-453 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
— 650-455 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MILLBRAE CA
— 650-456 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C PESCADERO CA
— 650-458 0XXX1XXX2XXX4XXX5XXX7XXX · 4 holders which blocks → ASTOUND BROADBAND, LLC - CA 485E SAN MATEO CA
— 650-461 0XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-462 4XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-463 1XXX6XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-464 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDWOOD CY CA
— 650-465 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 REDWOOD CY CA
— 650-466 0–9 XXXall 10 · 3 holders which blocks → PACIFIC BELL 9740 SNFC JUNPR CA
— 650-467 not yet reported which blocks → PACIFIC BELL 9740 SSNFRNCSCO CA
— 650-469 2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOS ALTOS CA
— 650-470 9XXX which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-471 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LOS ALTOS CA
— 650-472 5XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOS ALTOS CA
— 650-473 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-474 1XXX5XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-475 6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PALO ALTO CA
— 650-477 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN MATEO CA
— 650-478 not yet reported which blocks → PACIFIC BELL 9740 SNFC CNTRL CA
— 650-479 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HALFMOONBY CA
— 650-480 0XXX1XXX3XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDWOOD CY CA
— 650-481 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 REDWOOD CY CA
— 650-482 7XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 REDWOOD CY CA
— 650-483 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SAN MATEO CA
— 650-485 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-486 0XXX1XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 SNCRL-BLMT CA
— 650-487 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA HONDA CA
— 650-488 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC JUNPR CA
— 650-489 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCRL-BLMT CA
— 650-491 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SSNFRNCSCO CA
— 650-493 not yet reported which blocks → PACIFIC BELL 9740 PALO ALTO CA
— 650-494 4XXX which blocks → PACIFIC BELL 9740 PALO ALTO 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.