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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 619-337 4XXX5XXX which blocks → PACIFIC BELL 9740 LA MESA CA
— 619-338 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-339 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-342 5XXX6XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNDG SNDG CA
— 619-344 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-348 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C CHULAVISTA CA
— 619-350 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J JACUMBA CA
— 619-352 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
— 619-353 2XXX3XXX4XXX · 2 holders which blocks → ONVOY, LLC - CA 649C JACUMBA CA
— 619-355 not yet reported which blocks → 33 WIRELESS INC. 6967 LA MESA CA
— 619-356 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C SNDG SNDG CA
— 619-358 0XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 SNDG SNDG CA
— 619-359 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G SNDG SNDG CA
— 619-360 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 EL CAJON CA
— 619-362 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-364 not yet reported which blocks → NORTH COUNTY COMMUNICATION CORPORATION - CA 7894 SNDG SNDG CA
— 619-365 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CORONADO CA
— 619-367 3XXX4XXX · 2 holders which blocks → ONVOY, LLC - CA 649C PINEVALLEY CA
— 619-368 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
— 619-370 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHULAVISTA CA
— 619-371 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CHULAVISTA CA
— 619-372 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-374 not yet reported which blocks → ONVOY, LLC - CA 649C SNDG SNDG CA
— 619-375 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E EL CAJON CA
— 619-376 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-377 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PINEVALLEY CA
— 619-378 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPO CA
— 619-379 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-384 0XXX which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-387 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J EL CAJON CA
— 619-388 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LA MESA CA
— 619-390 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-391 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG SNDG CA
— 619-392 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
— 619-393 not yet reported which blocks → ONVOY, LLC - CA 649C SNDG SNDG CA
— 619-397 1XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-398 5XXX6XXX7XXX which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG SNDG CA
— 619-399 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NATIONALCY CA
— 619-400 3XXX6XXX7XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNDG SNDG CA
— 619-401 not yet reported which blocks → PACIFIC BELL 9740 EL CAJON CA
— 619-402 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 EL CAJON CA
— 619-403 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LA MESA CA
— 619-405 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-406 not yet reported which blocks → SPOK, INC. 6630 SNDG SNDG CA
— 619-407 0XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-409 2XXX which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-410 0XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 CHULAVISTA CA
— 619-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 619-412 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SNDG SNDG CA
— 619-413 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - CA 649C JACUMBA 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.