NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

4 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, last 30 days — NPA 667
NEW CINGULAR WIRELESS PCS, LLC - DC 2
ONVOY, LLC - MD 1
METROPCS, INC. 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-03-01 667-446 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ELKRIDGE MD
2022-03-01 667-468 6XXX which blocks → TON80 COMMUNICATIONS, LLC 516J NANTICOKE MD
2022-03-01 667-626 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CATONSVL MD
2022-03-01 667-737 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PERRYVILLE MD
2022-03-01 667-856 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DUNDALK MD
2022-02-25 667-404 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PRINCEFRCK MD
2022-02-24 667-466 1XXX3XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HAVREGRACE MD
2022-02-24 667-746 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GLENWOOD MD
2022-02-24 667-832 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BRYNPKLNCM MD
2022-02-24 667-846 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J COCKEYSVL MD
2022-02-22 667-394 0XXX2XXX6XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F NEWWINDSOR MD
2022-02-22 667-395 0XXX1XXX2XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2022-02-22 667-398 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F PT DEPOSIT MD
2022-02-10 667-393 0XXX2XXX3XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F MILLERSVL MD
2022-02-07 667-942 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ABERDEEN MD
2022-01-28 667-464 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BALTIMORE MD
2022-01-27 667-390 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2022-01-27 667-391 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2022-01-27 667-392 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2022-01-13 667-824 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J EDGEWOOD MD
2021-12-15 667-388 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2021-12-14 667-386 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 ARBUTUS MD
2021-12-10 667-384 0XXX1XXX8XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SALISBURY MD
2021-12-10 667-385 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SOLOMONS MD
2021-12-07 667-375 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHASE MD
2021-12-07 667-378 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2021-12-07 667-379 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2021-12-07 667-381 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2021-12-07 667-383 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2021-12-03 667-374 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WATERLO238 MD
2021-11-22 667-371 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ELLICOTTCY MD
2021-11-17 667-368 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 ELKTON MD
2021-11-17 667-369 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL MD
2021-11-01 667-358 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2021-10-25 667-359 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2021-10-25 667-899 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BALTIMORE MD
2021-10-22 667-788 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QUANTUM TELECOMMUNICATIONS, INC. - MD 2596 WESTMINSTR MD
2021-10-07 667-354 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2021-10-07 667-355 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2021-09-29 667-755 0–9 XXXall 10 · 4 holders which blocks → QUANTUM TELECOMMUNICATIONS, INC. - MD 2596 PIKESVILLE MD
2021-09-27 667-351 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2021-09-23 667-925 0–9 XXXall 10 · 6 holders which blocks → CORETEL MARYLAND, INC. - MD 469J BEL AIR MD
2021-09-01 667-338 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D CROFTON MD
2021-09-01 667-339 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D SYKESVILLE MD
2021-09-01 667-340 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D CHURCHVL MD
2021-09-01 667-341 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D DELMAR MD
2021-09-01 667-342 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MD 876D PRESTON MD
2021-09-01 667-348 2XXX3XXX4XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MD 876D RIDGELY MD
2021-09-01 667-349 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D STILL POND MD
2021-09-01 667-350 0XXX1XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC - MD 876D WINGATE MD

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.