Recent prefix assignments

0 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, all time — NPA 857

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 67

OMNIPOINT MIAMI E LICENSE, LLC 61

ONVOY, LLC - MA 42

METROPCS, INC. 25

PAETEC ITEL, LLC 19

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
2008-01-15	857-284	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2007-11-14	857-238	0–9 XXXwhole prefix which blocks →	VERIZON NEW ENGLAND INC.	9102	BOSTON	MA
2007-10-17	857-318	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BOSTON	MA
2007-08-08	857-342	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	HYDE PARK	MA
2007-07-23	857-869	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2007-06-18	857-350	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2007-06-15	857-404	0–9 XXXall 10 · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	NEWTON	MA
2007-05-11	857-294	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2007-04-11	857-207	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2007-01-12	857-218	0–9 XXXall 10 · 4 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	BROOKLINE	MA
2006-11-02	857-245	0–9 XXXall 10 · 3 holders which blocks →	YMAX COMMUNICATIONS CORP. - MA	316E	BROOKLINE	MA
2006-10-24	857-241	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BOSTON	MA
2006-10-17	857-654	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2006-09-20	857-334	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2006-08-01	857-288	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BOSTON	MA
2006-07-19	857-362	0–9 XXXall 10 · 3 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	BOSTON	MA
2006-05-17	857-232	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - MA	892D	NEWTON	MA
2006-03-30	857-226	0–9 XXXall 10 · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	NEWTON	MA
2006-03-21	857-445	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
2006-03-15	857-366	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2006-03-01	857-272	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
2006-02-16	857-233	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2006-02-10	857-307	0–9 XXXwhole prefix which blocks →	VERIZON NEW ENGLAND INC.	9102	BROOKLINE	MA
2006-01-03	857-277	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2005-11-01	857-383	0–9 XXXall 10 · 4 holders which blocks →	TC SYSTEMS, INC.	7135	BOSTON	MA
2005-09-19	857-413	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BOSTON	MA
2005-09-13	857-488	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2005-08-09	857-753	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2005-07-26	857-756	0–9 XXXall 10 · 4 holders which blocks →	METROPOLITAN TELECOMMUNICATIONS OF MASS DBA METTEL	0334	CAMBRIDGE	MA
2005-05-25	857-221	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	BOSTON	MA
2005-05-19	857-453	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BOSTON	MA
2005-02-28	857-203	0–9 XXXall 10 · 5 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	JAMAICA PL	MA
2004-11-17	857-496	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	SO BOSTON	MA
2002-10-28	857-201	0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks →	METROPCS, INC.	5562	WINTHROP	MA
2002-08-13	857-829	3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CAMBRIDGE	MA
2002-07-30	857-231	4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	NEWTON	MA
2002-07-30	857-492	0XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2002-07-30	857-526	8XXX9XXX · 2 holders which blocks →	METROPCS, INC.	5562	QUINCY	MA
2002-07-30	857-719	0XXX which blocks →	METROPCS, INC.	5562	JAMAICA PL	MA
2002-07-30	857-888	none assigned yet which blocks →	METROPCS, INC.	5562	EVERETT	MA
2002-04-02	857-449	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	BOSTON	MA
2002-03-18	857-234	3XXX4XXX5XXX7XXX8XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2001-12-17	857-472	5XXX6XXX7XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
2001-12-14	857-389	1XXX3XXX4XXX5XXX7XXX8XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CHARLESTN	MA
2001-11-28	857-544	1XXX4XXX5XXX7XXX8XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2001-10-11	857-209	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	CAMBRIDGE	MA
2001-08-24	857-498	4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BRIGHTON	MA
2001-08-03	857-928	1XXX8XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CAMBRIDGE	MA
2001-07-12	857-228	0–9 XXXall 10 · 4 holders which blocks →	PAETEC ITEL, LLC	829J	WATERTOWN	MA
2001-07-06	857-636	1XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	NEWTON	MA

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.