NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 551
NEW CINGULAR WIRELESS PCS, LLC - DC 1
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
2021-11-22 551-337 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
2021-11-22 551-338 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 JERSEYCITY NJ
2021-11-18 551-335 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 HACKENSACK NJ
2021-10-27 551-334 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 KEARNY NJ
2021-10-26 551-366 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H ENGLEWOOD NJ
2021-10-20 551-332 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D BAYONNE NJ
2021-10-06 551-330 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 CLIFFSIDE NJ
2021-10-06 551-331 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 UNION CITY NJ
2021-09-23 551-329 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H RIDGEWOOD NJ
2021-09-09 551-328 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 JERSEYCITY NJ
2021-08-27 551-326 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2021-08-27 551-327 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 UNION CITY NJ
2021-08-13 551-899 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H HASBROKHTS NJ
2021-08-11 551-755 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CLOSTER NJ
2021-08-11 551-955 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H WYCKOFF NJ
2021-07-27 551-325 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F JERSEYCITY NJ
2021-07-21 551-324 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H WESTWOOD NJ
2021-06-30 551-323 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 UNION CITY NJ
2021-06-23 551-322 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D TEANECK NJ
2021-05-27 551-320 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NJ 4948 RUTHERFORD NJ
2021-05-05 551-318 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2021-04-01 551-842 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H JERSEYCITY NJ
2021-03-16 551-837 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HACKENSACK NJ
2021-01-27 551-317 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C DUMONT NJ
2021-01-26 551-351 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CRAGMERE NJ
2021-01-26 551-355 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C ENGLEWOOD NJ
2021-01-26 551-455 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C FAIR LAWN NJ
2021-01-26 551-651 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - NJ 637C OAKLAND NJ
2021-01-26 551-751 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NJ 637C WESTWOOD NJ
2021-01-26 551-815 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NJ 637C RIDGEWOOD NJ
2021-01-08 551-316 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C CLIFFSIDE NJ
2020-12-11 551-294 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F RAMSEY NJ
2020-11-24 551-315 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAMSEY NJ
2020-11-10 551-312 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2020-10-26 551-290 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 KEARNY NJ
2020-10-14 551-348 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LEONIA NJ
2020-10-14 551-388 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BAYONNE NJ
2020-10-14 551-786 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H UNION CITY NJ
2020-10-14 551-946 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H HACKENSACK NJ
2020-10-01 551-309 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 478J JERSEYCITY NJ
2020-09-23 551-288 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C CLOSTER NJ
2020-08-10 551-307 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 JERSEYCITY NJ
2020-07-29 551-271 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
2020-07-22 551-321 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C PARK RIDGE NJ
2020-07-22 551-381 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NJ 637C RUTHERFORD NJ
2020-07-08 551-310 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D WESTWOOD NJ
2020-05-29 551-501 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C ENGLEWOOD NJ
2020-05-22 551-600 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H WYCKOFF NJ
2020-02-14 551-336 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HACKENSACK NJ
2020-02-14 551-345 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H HASBROKHTS NJ

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.