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
2023-08-23	667-447	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	COLUMBIA	MD
2023-08-09	667-445	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	CATONSVL	MD
2023-08-02	667-442	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ESSEX	MD
2023-07-26	667-441	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	PARKVILLE	MD
2023-07-25	667-440	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
2023-07-20	667-439	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	PIKESVILLE	MD
2023-07-19	667-438	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	CATONSVL	MD
2023-06-28	667-437	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	BALTIMORE	MD
2023-06-14	667-890	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MD	7325	ODENTON	MD
2023-06-14	667-891	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MD	7325	ODENTON	MD
2023-06-14	667-892	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MD	7325	ODENTON	MD
2023-06-14	667-893	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MD	7325	ODENTON	MD
2023-06-14	667-894	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MD	7325	ODENTON	MD
2023-05-19	667-436	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	TOWSON	MD
2023-05-17	667-435	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
2023-05-05	667-434	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	BALTIMORE	MD
2023-05-03	667-433	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	CATONSVL	MD
2023-04-20	667-432	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	CATONSVL	MD
2023-04-13	667-431	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	ARBUTUS	MD
2023-04-05	667-430	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	PIKESVILLE	MD
2023-02-13	667-429	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	PIKESVILLE	MD
2023-02-10	667-425	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	732J	BALTIMORE	MD
2023-02-10	667-428	1XXX8XXX · 2 holders which blocks →	NUSO, LLC	732J	SALISBURY	MD
2023-02-08	667-424	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ODENTON	MD
2023-01-06	667-423	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	ANNAPOLIS	MD
2022-12-16	667-422	0–9 XXXwhole prefix which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	BALTIMORE	MD
2022-11-23	667-420	9XXX which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	FEDERALSBG	MD
2022-11-08	667-419	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	CATONSVL	MD
2022-10-27	667-418	4XXX7XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	GREENSBORO	MD
2022-10-25	667-417	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MD	071F	GLENBURNIE	MD
2022-10-18	667-416	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MD	071F	ESSEX	MD
2022-10-11	667-415	0–9 XXXwhole prefix which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	ABERDEEN	MD
2022-09-28	667-414	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MD	071F	BALTIMORE	MD
2022-09-15	667-566	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	COMMIO, LLC	939H	STEVENSVL	MD
2022-09-15	667-877	0–9 XXXall 10 · 3 holders which blocks →	COMMIO, LLC	939H	PIKESVILLE	MD
2022-08-16	667-410	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	SEVERN	MD
2022-08-16	667-412	0XXX1XXX9XXX · 3 holders which blocks →	NUSO, LLC	732J	EASTON	MD
2022-08-16	667-413	0–9 XXXall 10 · 3 holders which blocks →	NUSO, LLC	732J	ARGRGBSNIS	MD
2022-08-03	667-409	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MD	071F	PARKVILLE	MD
2022-05-20	667-408	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	6395	ANNAPOLIS	MD
2022-05-19	667-407	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MD	876D	BALTIMORE	MD
2022-05-18	667-406	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	BALTIMORE	MD
2022-03-30	667-897	7XXX8XXX · 2 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	CHESAPKECY	MD
2022-03-23	667-622	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	PIKESVILLE	MD
2022-03-23	667-693	7XXX which blocks →	TON80 COMMUNICATIONS, LLC	516J	VIENNA	MD
2022-03-22	667-405	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	GLENBURNIE	MD
2022-03-14	667-827	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	BERLIN	MD
2022-03-09	667-743	0XXX1XXX7XXX · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	QUEENSTOWN	MD
2022-03-04	667-483	7XXX which blocks →	TON80 COMMUNICATIONS, LLC	516J	DEALISLAND	MD
2022-03-03	667-526	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	CENTREVL	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.