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
2001-06-29	857-217	1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	METROPCS, INC.	5562	DORCHESTER	MA
2001-06-29	857-399	1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MA	990E	ROXBURY	MA
2001-06-29	857-626	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BELMONT	MA
2001-06-29	857-776	0XXX1XXX3XXX6XXX7XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MA	4018	CHELSEA	MA
2001-06-19	857-991	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	BOSTON	MA
2001-06-15	857-939	1XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	QUINCY	MA
2001-05-23	857-227	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	SOMERVILLE	MA
2001-05-17	857-222	not yet reported which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2001-05-03	857-225	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	BROOKLINE	MA
2001-05-03	857-523	1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	SOMERVILLE	MA
2001-05-03	857-998	2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	CAMBRIDGE	MA
2001-04-24	857-363	2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	EVERETT	MA
2001-04-23	857-212	none assigned yet which blocks →	METROPCS, INC.	5562	DORCHESTER	MA
2001-04-23	857-252	1XXX which blocks →	PAETEC ITEL, LLC	829J	QUINCY	MA
2001-04-23	857-253	1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	CAMBRIDGE	MA
2001-04-23	857-254	1XXX8XXX9XXX · 2 holders which blocks →	PAETEC ITEL, LLC	829J	BOSTON	MA
2001-04-23	857-255	1XXX9XXX which blocks →	PAETEC ITEL, LLC	829J	NEWTON	MA
2001-04-20	857-257	8XXX which blocks →	METROPCS, INC.	5562	SO BOSTON	MA
2001-04-02	857-891	not yet reported which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2001-04-02	857-919	5XXX7XXX8XXX which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BRIGHTON	MA
2001-03-29	857-499	2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	QUINCY	MA
2001-03-27	857-524	1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	SO BOSTON	MA
2001-03-27	857-559	1XXX2XXX3XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BRIGHTON	MA
2001-03-27	857-588	1XXX2XXX3XXX4XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CHARLESTN	MA
2001-03-27	857-728	1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	JAMAICA PL	MA
2001-03-20	857-204	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BOSTON	MA
2001-03-20	857-220	7XXX8XXX9XXX which blocks →	PAETEC ITEL, LLC	829J	DORCHESTER	MA
2001-03-20	857-364	0–9 XXXall 10 · 4 holders which blocks →	PAETEC ITEL, LLC	829J	BROOKLINE	MA
2001-03-20	857-373	7XXX8XXX9XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	BELMONT	MA
2001-03-20	857-401	7XXX8XXX9XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	SO BOSTON	MA
2001-03-20	857-403	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	QUINCY	MA
2001-03-20	857-547	7XXX8XXX9XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	JAMAICA PL	MA
2001-03-20	857-574	0–9 XXXall 10 · 6 holders which blocks →	PAETEC ITEL, LLC	829J	EASTBOSTON	MA
2001-03-20	857-598	2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MILTON	MA
2001-03-20	857-816	2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WINTHROP	MA
2001-03-19	857-205	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
—	857-211	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MA
—	857-223	none assigned yet which blocks →	PAETEC ITEL, LLC	829J	BOSTON	MA
—	857-229	0–9 XXXall 10 · 4 holders which blocks →	PAETEC ITEL, LLC	829J	NEWTON	MA
—	857-239	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - MA	892D	BOSTON	MA
—	857-246	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	BOSTON	MA
—	857-271	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - MA	892D	DORCHESTER	MA
—	857-299	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - MA	892D	BELMONT	MA
—	857-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MA
—	857-345	0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA	6387	HYDE PARK	MA
—	857-348	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	BOSTON	MA
—	857-361	0–9 XXXall 10 · 7 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BROOKLINE	MA
—	857-371	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - MA	892D	WATERTOWN	MA
—	857-402	0–9 XXXall 10 · 4 holders which blocks →	HD CARRIER LLC	321J	EASTBOSTON	MA
—	857-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	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.