NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 909
FRONTIER CALIFORNIA INC. 156
T-MOBILE USA, INC. 87
NEW CINGULAR WIRELESS PCS, LLC 75
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 72
METROPCS NETWORKS, LLC 52
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
— 909-464 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 CHINO CA
— 909-465 3XXX4XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 2319 CHINO CA
— 909-466 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 UPLAND CA
— 909-467 6XXX8XXX9XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 2319 ONTARIO CA
— 909-468 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 DIAMONDBAR CA
— 909-469 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 POMONA CA
— 909-472 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ONTARIO CA
— 909-473 4XXX5XXX which blocks → FRONTIER CALIFORNIA INC. 2319 MARSHALL CA
— 909-474 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER CALIFORNIA INC. 2319 MARSHALL CA
— 909-475 0XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → FRONTIER CALIFORNIA INC. 2319 MARSHALL CA
— 909-476 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 UPLAND CA
— 909-477 0XXX1XXX7XXX9XXX which blocks → FRONTIER CALIFORNIA INC. 2319 UPLAND CA
— 909-478 2XXX4XXX8XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 2319 REDLANDS CA
— 909-480 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER CALIFORNIA INC. 2319 CLAREMONT CA
— 909-481 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 UPLAND CA
— 909-482 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 CLAREMONT CA
— 909-483 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 UPLAND CA
— 909-484 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 UPLAND CA
— 909-489 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-494 0XXX2XXX8XXX · 3 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 S BERNDINO CA
— 909-495 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 S BERNDINO CA
— 909-496 none assigned yet which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
— 909-498 2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - CA 7379 COLTON CA
— 909-500 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C CALIMESA CA
— 909-502 not yet reported which blocks → 33 WIRELESS INC. 6967 CORONA CA
— 909-510 0XXX1XXX2XXX3XXX7XXX9XXX which blocks → PAETEC ITEL, LLC 829J ONTARIO CA
— 909-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 909-512 2XXX6XXX · 2 holders which blocks → PACIFIC BELL 9740 COLTON CA
— 909-514 none assigned yet which blocks → PACIFIC BELL 9740 COLTON CA
— 909-515 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H S BERNDINO CA
— 909-517 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 CHINO CA
— 909-518 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ONTARIO CA
— 909-519 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ONTARIO CA
— 909-523 not yet reported which blocks → SPOK, INC. 6630 CLAREMONT CA
— 909-524 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J POMONA CA
— 909-525 0–9 XXXall 10 · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J POMONA CA
— 909-527 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C UPLAND CA
— 909-534 none assigned yet which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
— 909-535 not yet reported which blocks → SPOK, INC. 6630 COLTON CA
— 909-539 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → IP HORIZON LLC 515J CHINO CA
— 909-540 not yet reported which blocks → 33 WIRELESS INC. 6967 RIVERSIDE CA
— 909-542 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CLAREMONT CA
— 909-543 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIALTO CA
— 909-546 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RIALTO CA
— 909-547 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BIGBEAR CY CA
— 909-548 1XXX5XXX8XXX9XXX · 4 holders which blocks → FRONTIER CALIFORNIA INC. 2319 CHINO CA
— 909-549 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FONTANA CA
— 909-553 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 S BERNDINO CA
— 909-554 0XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 COLTON CA
— 909-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST 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.