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
— 619-475 not yet reported which blocks → PACIFIC BELL 9740 NATIONALCY CA
— 619-476 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-477 not yet reported which blocks → PACIFIC BELL 9740 NATIONALCY CA
— 619-478 0XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → PACIFIC BELL 9740 CAMPO CA
— 619-479 not yet reported which blocks → PACIFIC BELL 9740 NATIONALCY CA
— 619-482 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-487 0–9 XXXall 10 · 2 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-489 4XXX7XXX which blocks → ONVOY, LLC - CA 649C CHULAVISTA CA
— 619-490 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LA MESA CA
— 619-491 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-492 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - CA 649C DULZURA CA
— 619-497 none assigned yet which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-498 not yet reported which blocks → PACIFIC BELL 9740 CHULAVISTA CA
— 619-499 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L EL CAJON CA
— 619-500 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C CHULAVISTA CA
— 619-501 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-503 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → IP HORIZON LLC 515J CAMPO CA
— 619-504 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EL CAJON CA
— 619-506 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CHULAVISTA CA
— 619-507 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-510 0–9 XXXall 10 · 3 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 619-512 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 NATIONALCY CA
— 619-515 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-516 8XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-517 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-518 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-520 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-521 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-522 1XXX4XXX · 2 holders which blocks → PACIFIC BELL 9740 CORONADO CA
— 619-523 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-524 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-525 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-526 not yet reported which blocks → SPOK, INC. 6630 SNDG SNDG CA
— 619-527 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-528 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-529 not yet reported which blocks → SPOK, INC. 6630 SNDG SNDG CA
— 619-531 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-532 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-533 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-539 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNDG SNDG CA
— 619-540 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-542 9XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-543 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-544 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-545 not yet reported which blocks → PACIFIC BELL 9740 CORONADO CA
— 619-546 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-553 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-554 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CORONADO CA
— 619-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST 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.