Recent prefix assignments

4 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 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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
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 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.