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
2015-11-25	857-408	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-11-23	857-880	0–9 XXXall 10 · 5 holders which blocks →	BARR TELL USA, INC. - MA	732H	BOSTON	MA
2015-11-16	857-406	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-11-04	857-282	0–9 XXXwhole prefix which blocks →	VERIZON NEW ENGLAND INC.	9102	BOSTON	MA
2015-10-07	857-337	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BROOKLINE	MA
2015-10-07	857-360	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-09-22	857-990	0–9 XXXall 10 · 7 holders which blocks →	EVOLVE CELLULAR, INC.	139F	BOSTON	MA
2015-09-03	857-262	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-08-17	857-276	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-07-29	857-972	0–9 XXXall 10 · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BOSTON	MA
2015-07-22	857-331	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	CAMBRIDGE	MA
2015-07-01	857-275	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-07-01	857-278	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-06-04	857-319	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-06-01	857-407	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	ROXBURY	MA
2015-03-31	857-325	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	NEWTON	MA
2015-03-23	857-666	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - MA	892D	BROOKLINE	MA
2015-03-20	857-800	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MA	892D	BOSTON	MA
2015-03-18	857-856	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - MA	892D	CAMBRIDGE	MA
2015-03-09	857-757	0–9 XXXall 10 · 5 holders which blocks →	THE VOICE APPLICATION NETWORK, LLC	507J	CAMBRIDGE	MA
2015-02-27	857-316	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BRIGHTON	MA
2015-02-03	857-529	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	CAMBRIDGE	MA
2015-02-02	857-327	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2015-01-28	857-314	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	MILTON	MA
2015-01-22	857-352	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2014-12-23	857-770	0–9 XXXall 10 · 5 holders which blocks →	INTRADO COMMUNICATIONS, LLC	116E	BOSTON	MA
2014-12-16	857-309	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - MA	892D	DORCHESTER	MA
2014-10-14	857-310	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2014-10-14	857-320	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CAMBRIDGE	MA
2014-10-10	857-707	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BROOKLINE	MA
2014-10-01	857-330	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2014-09-30	857-270	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	CAMBRIDGE	MA
2014-09-30	857-957	0–9 XXXall 10 · 5 holders which blocks →	WIDE VOICE, LLC - MA	756G	BOSTON	MA
2014-09-16	857-308	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2014-08-04	857-302	0–9 XXXall 10 · 4 holders which blocks →	AIRUS, INC. - MA	428H	BOSTON	MA
2014-07-28	857-703	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	HYDE PARK	MA
2014-06-10	857-930	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2014-04-09	857-377	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	BOSTON	MA
2014-02-07	857-702	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	BOSTON	MA
2014-01-15	857-701	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2013-07-19	857-305	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	BOSTON	MA
2013-07-15	857-267	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	MILTON	MA
2013-07-03	857-415	0–9 XXXall 10 · 4 holders which blocks →	VONAGE AMERICA LLC	197D	BOSTON	MA
2013-04-24	857-269	0–9 XXXall 10 · 3 holders which blocks →	PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA	268F	ROXBURY	MA
2013-04-23	857-273	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	JAMAICA PL	MA
2013-03-13	857-304	0–9 XXXall 10 · 7 holders which blocks →	TC SYSTEMS, INC.	7135	WATERTOWN	MA
2013-03-07	857-317	0–9 XXXall 10 · 5 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	BOSTON	MA
2013-01-22	857-323	0–9 XXXall 10 · 5 holders which blocks →	VERIZON NEW ENGLAND INC.	9102	CHELSEA	MA
2012-12-06	857-301	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BOSTON	MA
2012-11-08	857-303	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	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.