NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 619
PACIFIC BELL 190
NEW CINGULAR WIRELESS PCS, LLC 104
T-MOBILE USA, INC. 96
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 75
ONVOY, LLC - CA 49
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 619-661 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-662 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-664 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG SNDG CA
— 619-665 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-666 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-667 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-668 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-669 3XXX5XXX8XXX which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-670 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-671 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-673 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-678 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
— 619-680 none assigned yet which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-681 2XXX3XXX4XXX · 2 holders which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-682 none assigned yet which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-683 4XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-685 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-686 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-687 none assigned yet which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-688 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-690 7XXX which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-691 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-692 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-696 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-697 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-698 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-699 9XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-700 not yet reported which blocks → CA
— 619-702 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-704 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C SNDG SNDG CA
— 619-708 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-709 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-710 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 619-713 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LA MESA CA
— 619-717 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-718 0XXX1XXX2XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-719 0XXX1XXX5XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG SNDG CA
— 619-722 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L HARBSNALPN CA
— 619-723 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-724 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C LA MESA CA
— 619-725 1XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-732 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C NATIONALCY CA
— 619-733 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL CAJON CA
— 619-734 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CHULAVISTA CA
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.