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
— 619-269 0XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SNDG SNDG CA
— 619-270 0XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J EL CAJON CA
— 619-271 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CHULAVISTA CA
— 619-273 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E NATIONALCY CA
— 619-275 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-276 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-278 1XXX8XXX9XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-280 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-281 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-282 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-283 4XXX which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-284 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-285 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-286 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-287 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-290 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SNDG SNDG CA
— 619-291 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-292 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → PACIFIC BELL 9740 NATIONALCY CA
— 619-293 none assigned yet which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-294 none assigned yet which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-295 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-296 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-297 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-298 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-299 not yet reported which blocks → PACIFIC BELL 9740 SNDG SNDG CA
— 619-300 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-303 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L LA MESA CA
— 619-308 0XXX1XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG SNDG CA
— 619-309 3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 619-312 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L EL CAJON CA
— 619-313 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 CORONADO CA
— 619-315 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 LA MESA CA
— 619-316 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNDG SNDG CA
— 619-318 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG SNDG CA
— 619-319 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
— 619-320 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HARBSNALPN CA
— 619-321 7XXX8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7147 SNDG SNDG CA
— 619-322 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 EL CAJON CA
— 619-324 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HARBSNALPN CA
— 619-325 6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG SNDG CA
— 619-326 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNDG SNDG CA
— 619-327 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 NATIONALCY CA
— 619-328 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L EL CAJON CA
— 619-330 not yet reported which blocks → ONVOY, LLC - CA 649C SNDG SNDG CA
— 619-331 not yet reported which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 SNDG SNDG CA
— 619-333 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E EL CAJON CA
— 619-334 not yet reported which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L EL CAJON CA
— 619-335 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA MESA CA
— 619-336 not yet reported which blocks → PACIFIC BELL 9740 NATIONALCY 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.