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
2012-10-23	857-313	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2012-08-16	857-285	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	CAMBRIDGE	MA
2012-05-23	857-999	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	CAMBRIDGE	MA
2012-03-08	857-248	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2012-03-08	857-260	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2012-03-05	857-777	0–9 XXXall 10 · 4 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	CAMBRIDGE	MA
2012-02-28	857-240	0–9 XXXall 10 · 2 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	NEWTON	MA
2012-02-16	857-219	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - MA	892D	NEWTON	MA
2012-02-08	857-208	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-12-06	857-214	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-11-24	857-256	0–9 XXXall 10 · 7 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	EASTBOSTON	MA
2011-11-10	857-202	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-10-07	857-206	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-10-03	857-213	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	BOSTON	MA
2011-09-08	857-242	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	CAMBRIDGE	MA
2011-09-08	857-268	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-08-02	857-368	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	BOSTON	MA
2011-07-15	857-250	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2011-07-12	857-263	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-07-12	857-265	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
2011-05-24	857-259	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	CAMBRIDGE	MA
2011-04-17	857-500	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	CAMBRIDGE	MA
2011-04-06	857-600	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	CAMBRIDGE	MA
2011-03-10	857-210	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2011-03-10	857-321	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2011-02-22	857-261	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2011-01-10	857-200	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2010-11-22	857-444	0–9 XXXwhole prefix which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	BOSTON	MA
2010-11-09	857-333	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2010-11-03	857-400	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	BOSTON	MA
2010-10-08	857-300	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2010-09-21	857-264	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2010-06-25	857-258	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2010-06-10	857-266	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2010-02-23	857-215	0–9 XXXwhole prefix which blocks →	VERIZON NEW ENGLAND INC.	9102	BROOKLINE	MA
2010-02-15	857-293	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	EASTBOSTON	MA
2009-12-17	857-224	0–9 XXXwhole prefix which blocks →	VERIZON NEW ENGLAND INC.	9102	BOSTON	MA
2009-11-05	857-243	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - MA	892D	BOSTON	MA
2009-11-03	857-216	0–9 XXXall 10 · 4 holders which blocks →	YMAX COMMUNICATIONS CORP. - MA	316E	NEWTON	MA
2009-06-11	857-615	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2009-06-08	857-237	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2009-06-08	857-247	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2009-04-15	857-230	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2008-11-18	857-235	0–9 XXXwhole prefix which blocks →	VERIZON NEW ENGLAND INC.	9102	CAMBRIDGE	MA
2008-08-04	857-236	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2008-08-04	857-249	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2008-08-04	857-251	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2008-08-04	857-312	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2008-08-04	857-417	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2008-06-10	857-244	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	BOSTON	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.