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 626
PACIFIC BELL 116
T-MOBILE USA, INC. 106
NEW CINGULAR WIRELESS PCS, LLC 83
FRONTIER CALIFORNIA INC. 75
ONVOY, LLC - CA 43
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
— 626-609 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C AZUSA CA
— 626-610 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J AZUSA CA
— 626-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 626-614 1XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → PACIFIC BELL 9740 ALHAMBRA CA
— 626-616 4XXX7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PSDN PSDN CA
— 626-617 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EL MONTE CA
— 626-618 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J EL MONTE CA
— 626-622 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 COVINA CA
— 626-623 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 ARCADIA CA
— 626-626 0XXX1XXX3XXX5XXX6XXX7XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA PUENTE CA
— 626-627 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALHAMBRA CA
— 626-628 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - CA 649C PSDN PSDN CA
— 626-629 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 AZUSA CA
— 626-633 2XXX5XXX6XXX7XXX · 2 holders which blocks → FRONTIER CALIFORNIA INC. 2319 AZUSA CA
— 626-636 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J EL MONTE CA
— 626-638 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LA PUENTE CA
— 626-639 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PSDN PSDN CA
— 626-641 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EL MONTE CA
— 626-642 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ALHAMBRA CA
— 626-643 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EL MONTE CA
— 626-644 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PSDN PSDN CA
— 626-646 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 COVINA CA
— 626-647 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PSDN PSDN CA
— 626-650 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J AZUSA CA
— 626-651 not yet reported which blocks → SPOK, INC. 6630 ALHAMBRA CA
— 626-652 1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 EL MONTE CA
— 626-653 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J COVINA CA
— 626-656 0XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ALHAMBRA CA
— 626-657 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PSDN PSDN CA
— 626-660 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 PSDN PSDN CA
— 626-662 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARCADIA CA
— 626-664 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 COVINA CA
— 626-665 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 COVINA CA
— 626-666 not yet reported which blocks → PACIFIC BELL 9740 PSDN PSDN CA
— 626-667 0XXX2XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LA PUENTE CA
— 626-668 not yet reported which blocks → 33 WIRELESS INC. 6967 ARCADIA CA
— 626-672 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL MONTE CA
— 626-674 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EL MONTE CA
— 626-675 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EL MONTE CA
— 626-676 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PSDN PSDN CA
— 626-677 0XXX1XXX6XXX7XXX8XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ALHAMBRA CA
— 626-678 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J COVINA CA
— 626-679 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ALHAMBRA CA
— 626-683 not yet reported which blocks → PACIFIC BELL 9740 PSDN PSDN CA
— 626-685 not yet reported which blocks → PACIFIC BELL 9740 PSDN PSDN CA
— 626-689 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PSDN PSDN CA
— 626-690 not yet reported which blocks → SPOK, INC. 6630 COVINA CA
— 626-691 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL (COMPETITIVE) 7480 AZUSA CA
— 626-696 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PSDN PSDN CA
— 626-699 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C COVINA 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.