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 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 619-563 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-564 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-566 5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CA 649C HARBSNALPN CA
— 619-567 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA MESA CA
— 619-568 0XXX1XXX2XXX4XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONADO CA
— 619-570 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-571 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-572 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-574 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-575 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-578 1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-579 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-580 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SNDG SNDG CA
— 619-582 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-583 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-584 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-585 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-588 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-589 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-590 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-591 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CHULAVISTA CA
— 619-593 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-594 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-595 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-596 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-599 2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL CAJON CA
— 619-602 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-605 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG LVTA CA
— 619-610 8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNDG SNDG CA
— 619-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 619-615 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-618 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C SNDG SNDG CA
— 619-620 not yet reported which blocks → SPOK, INC. 6630 SNDG SNDG CA
— 619-624 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-625 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E DULZURA CA
— 619-628 6XXX7XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-631 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J EL CAJON CA
— 619-637 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J PINEVALLEY CA
— 619-639 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - CA 649C LA MESA CA
— 619-640 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-641 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-644 not yet reported which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-645 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-647 2XXX which blocks → METROPCS, INC. 5562 EL CAJON CA
— 619-648 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C LA MESA CA
— 619-651 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CHULAVISTA CA
— 619-652 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-656 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-659 4XXX6XXX7XXX which blocks → PACIFIC BELL 9740 HARBSNALPN CA
— 619-660 not yet reported which blocks → PACIFIC BELL 9740 LA MESA 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.