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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-09-01 667-380 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D ANNAPOLIS MD
2021-09-01 667-403 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D TOWSON MD
2021-08-31 667-678 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D COLUMBIA MD
2021-08-26 667-334 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2021-08-26 667-335 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2021-07-28 667-343 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-08 667-331 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-06-23 667-328 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ESSEX MD
2021-06-23 667-329 0XXX1XXX6XXX7XXX9XXX · 4 holders which blocks → TELNYX LLC 073H PARKTON MD
2021-06-17 667-361 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CHURCHHILL MD
2021-06-17 667-467 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H DENTON MD
2021-06-17 667-665 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H HILLSBORO MD
2021-06-17 667-669 2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GALENA MD
2021-06-17 667-775 1XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MILLINGTON MD
2021-06-11 667-325 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2021-06-03 667-324 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2021-06-03 667-529 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H HURLOCK MD
2021-05-27 667-656 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H EDGEWOOD MD
2021-05-25 667-323 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 QUEENSTOWN MD
2021-05-12 667-322 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D WATERLO236 MD
2021-05-07 667-365 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHESAPKECY MD
2021-05-05 667-319 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHESTERTN MD
2021-05-05 667-320 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2021-05-04 667-318 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F COCKEYSVL MD
2021-04-26 667-644 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SEVERNA PK MD
2021-04-26 667-647 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H NORTH EAST MD
2021-04-26 667-668 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H FALLSTON MD
2021-04-26 667-772 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H SPARKSGLNC MD
2021-04-26 667-778 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SPARROWSPT MD
2021-04-21 667-317 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PRINCEANNE MD
2021-04-17 667-316 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELNYX LLC 073H OXFORD MD
2021-04-13 667-310 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2021-04-13 667-315 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F BEL AIR MD
2021-03-25 667-356 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D SEVERN MD
2021-03-25 667-360 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D ODENTON MD
2021-03-25 667-363 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D SHERWD FOR MD
2021-03-25 667-370 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MD 876D PARKTON MD
2021-03-25 667-387 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D PERRYVILLE MD
2021-03-25 667-396 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D PT DEPOSIT MD
2021-03-25 667-397 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - MD 876D SOLOMONS MD
2021-03-25 667-426 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D TANEYTOWN MD
2021-03-25 667-427 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D WEST RIVER MD
2021-03-25 667-476 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D GLENWOOD MD
2021-03-25 667-477 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D HAMPSTEAD MD
2021-03-25 667-567 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D HAVREGRACE MD
2021-03-25 667-576 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MD 876D JARRETTSVL MD
2021-03-25 667-657 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D CHASE MD
2021-03-25 667-887 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MD 876D WORTHINGTN MD
2021-03-25 667-962 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MD 876D NORTHBEACH MD
2021-03-25 667-966 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D NEWWINDSOR 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.