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
2026-06-30	857-881	1XXX which blocks →	8X8, INC.	193E	BOSTON	MA
2026-05-04	857-433	not yet reported which blocks →	SHELCOMM	0051	BOSTON	MA
2026-05-04	857-434	not yet reported which blocks →	SHELCOMM	0051	CAMBRIDGE	MA
2025-07-10	857-431	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	WAVENATION, LLC	700J	BOSTON	MA
2025-01-07	857-579	0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2024-11-21	857-656	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2024-11-13	857-430	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
2024-11-12	857-944	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
2024-11-11	857-989	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NEWTON	MA
2024-11-07	857-822	2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY SPECTRUM, LLC	624H	SOMERVILLE	MA
2024-11-07	857-833	3XXX7XXX8XXX9XXX · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	WINTHROP	MA
2024-11-07	857-857	0–9 XXXall 10 · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	NEWTON	MA
2024-11-01	857-426	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2024-11-01	857-427	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2024-11-01	857-429	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2024-07-01	857-421	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2024-05-17	857-351	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2024-02-09	857-339	0–9 XXXall 10 · 3 holders which blocks →	COMMIO, LLC	939H	ROXBURY	MA
2023-11-09	857-565	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2023-10-11	857-605	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BRIGHTON	MA
2023-10-06	857-506	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2023-09-26	857-550	0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 3 holders which blocks →	COMMIO, LLC	939H	BELMONT	MA
2023-08-17	857-497	0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CHARLESTN	MA
2023-06-09	857-428	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MA	892D	EVERETT	MA
2023-01-09	857-961	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BRIGHTON	MA
2022-11-23	857-420	0XXX4XXX5XXX6XXX7XXX8XXX which blocks →	ONVOY, LLC - MA	892D	CAMBRIDGE	MA
2022-11-17	857-416	0–9 XXXall 10 · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	BOSTON	MA
2022-11-17	857-418	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	DORCHESTER	MA
2022-11-08	857-405	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2022-09-21	857-398	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2022-07-28	857-396	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2022-07-28	857-397	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2022-03-22	857-737	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	WATERTOWN	MA
2022-02-24	857-467	0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	SOMERVILLE	MA
2022-02-15	857-639	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	CAMBRIDGE	MA
2022-02-15	857-693	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	ROXBURY	MA
2022-02-11	857-468	0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	CHARLESTN	MA
2022-02-11	857-832	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	BRIGHTON	MA
2022-02-09	857-746	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	BROOKLINE	MA
2022-02-07	857-466	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	HYDE PARK	MA
2022-01-27	857-395	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	ROXBURY	MA
2022-01-07	857-767	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	BOSTON	MA
2021-12-08	857-394	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BELMONT	MA
2021-12-03	857-391	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CHARLESTN	MA
2021-10-26	857-688	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	DORCHESTER	MA
2021-10-07	857-390	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
2021-09-24	857-388	0–9 XXXall 10 · 3 holders which blocks →	COMMIO, LLC	939H	SOMERVILLE	MA
2021-09-23	857-491	0–9 XXXall 10 · 3 holders which blocks →	LIGHTPATH OF NEW ENGLAND	814J	BOSTON	MA
2021-09-10	857-387	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	QUINCY	MA
2021-09-09	857-381	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	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.