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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2015-08-17	667-444	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
2015-08-14	667-812	0–9 XXXwhole prefix which blocks →	VERIZON MARYLAND, INC.	9212	WATERLO236	MD
2015-07-23	667-770	0–9 XXXall 10 · 4 holders which blocks →	AIRUS, INC. - MD	691H	BALTIMORE	MD
2015-05-21	667-367	0–9 XXXall 10 · 8 holders which blocks →	BALTIMORE-WASHINGTON TELEPHONE (BWT)	8697	WESTMINSTR	MD
2015-05-14	667-333	0–9 XXXall 10 · 6 holders which blocks →	BALTIMORE-WASHINGTON TELEPHONE (BWT)	8697	ARGRGBSNIS	MD
2015-05-11	667-312	0–9 XXXall 10 · 5 holders which blocks →	ATLANTECH ONLINE, INC. - MD	361H	BALTIMORE	MD
2015-05-08	667-677	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
2015-03-23	667-999	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - MD	876D	ELKRIDGE	MD
2015-03-17	667-930	0–9 XXXall 10 · 4 holders which blocks →	PEERLESS NETWORK OF MARYLAND, LLC	568G	BALTIMORE	MD
2015-02-20	667-802	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	CATONSVL	MD
2015-02-13	667-233	0–9 XXXwhole prefix which blocks →	VERIZON MARYLAND, INC.	9212	BALTIMORE	MD
2015-01-21	667-228	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	ABERDEEN	MD
2014-12-24	667-251	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	TOWSON	MD
2014-07-15	667-225	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ANNAPOLIS	MD
2014-07-08	667-777	0–9 XXXall 10 · 8 holders which blocks →	PEERLESS NETWORK OF MARYLAND, LLC	568G	SEVERNA PK	MD
2013-08-16	667-803	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MD	071F	SOLOMONS	MD
2013-07-16	667-206	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	TOWSON	MD
2013-05-10	667-305	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	551G	PIKESVILLE	MD
2013-04-09	667-307	0–9 XXXall 10 · 7 holders which blocks →	PEERLESS NETWORK OF MARYLAND, LLC	568G	CROFTON	MD
2013-03-11	667-253	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	NUSO, LLC	551G	SALISBURY	MD
2013-03-11	667-303	0–9 XXXall 10 · 3 holders which blocks →	NUSO, LLC	551G	BALTIMORE	MD
2012-11-20	667-308	0–9 XXXall 10 · 8 holders which blocks →	PEERLESS NETWORK OF MARYLAND, LLC	568G	TOWSON	MD
2012-11-20	667-401	0–9 XXXall 10 · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MD	6119	BALTIMORE	MD
2012-05-23	667-330	0XXX1XXX3XXX4XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	SALISBURY	MD
2012-02-08	667-203	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-205	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-207	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-208	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-209	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-210	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-212	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-213	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-214	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-216	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-217	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-218	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-219	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-224	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-234	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
2012-02-08	667-239	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	BALTIMORE	MD
—	667-211	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MD
—	667-231	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	ABERDEEN	MD
—	667-254	0–9 XXXall 10 · 5 holders which blocks →	CORE COMMUNICATIONS, INC.- MD	2593	CHESTERTN	MD
—	667-260	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
—	667-262	0–9 XXXall 10 · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	BALTIMORE	MD
—	667-309	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
—	667-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MD
—	667-314	0–9 XXXall 10 · 8 holders which blocks →	BARR TELL USA, INC.	964H	WESTMINSTR	MD
—	667-344	0–9 XXXall 10 · 4 holders which blocks →	TELNYX LLC	073H	CHASE	MD
—	667-389	0–9 XXXall 10 · 5 holders which blocks →	COMMIO, LLC	939H	CAMBRIDGE	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.