NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 619-737 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → AT&T ENTERPRISES, LLC 516C CHULAVISTA CA
— 619-739 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHULAVISTA CA
— 619-740 1XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-741 0XXX8XXX9XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LA MESA CA
— 619-742 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA JOLLA CA
— 619-743 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 POWAY CA
— 619-744 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-747 not yet reported which blocks → NORTH COUNTY COMMUNICATION CORPORATION - CA 7894 JACUMBA CA
— 619-749 0XXX8XXX9XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L EL CAJON CA
— 619-750 0XXX which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
— 619-754 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CHULAVISTA CA
— 619-756 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-757 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG SNDG CA
— 619-758 2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-760 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EL CAJON CA
— 619-764 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-765 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C NATIONALCY CA
— 619-766 2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 JACUMBA CA
— 619-767 0XXX8XXX · 2 holders which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-768 3XXX4XXX · 2 holders which blocks → ONVOY, LLC - CA 649C EL CAJON CA
— 619-770 1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-772 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → METROPCS, INC. 5562 LA MESA CA
— 619-773 0XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NATIONALCY CA
— 619-774 not yet reported which blocks → NORTH COUNTY COMMUNICATION CORPORATION - CA 7894 DULZURA CA
— 619-777 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CHULAVISTA CA
— 619-778 none assigned yet which blocks → METROPCS, INC. 5562 SNDG SNDG CA
— 619-781 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CHULAVISTA CA
— 619-783 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-784 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 LA MESA CA
— 619-785 3XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-787 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-788 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG SNDG CA
— 619-789 2XXX3XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - CA 649C NATIONALCY CA
— 619-790 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E PINEVALLEY CA
— 619-791 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 NATIONALCY CA
— 619-794 0XXX1XXX2XXX which blocks → METROPCS, INC. 5562 SNDG SNDG CA
— 619-795 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-797 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA MESA CA
— 619-798 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-800 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SNDG SNDG CA
— 619-801 not yet reported which blocks → 33 WIRELESS INC. 6967 SNDG SNDG CA
— 619-804 none assigned yet which blocks → METROPCS, INC. 5562 SNDG SNDG CA
— 619-805 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
— 619-807 none assigned yet which blocks → METROPCS, INC. 5562 SNDG SNDG CA
— 619-808 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-809 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 6906 SNDG SNDG CA
— 619-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 619-813 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-814 not yet reported which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG SNDG CA
— 619-817 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 SNDG SNDG CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.