NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 617
VERIZON NEW ENGLAND INC. 334
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 71
NEW CINGULAR WIRELESS PCS, LLC - DC 68
PAETEC ITEL, LLC 44
TC SYSTEMS, INC. 41
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2025-03-18 617-617 0–9 XXXwhole prefix which blocks → MASS MOBILE LLC 125L BOSTON MA
2024-09-25 617-857 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BROOKLINE MA
2024-02-09 617-781 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMMIO, LLC 939H DORCHESTER MA
2024-01-05 617-609 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
2023-10-18 617-885 0–9 XXXall 10 · 6 holders which blocks → MOBILESPHERE LLC 487K BOSTON MA
2023-07-18 617-214 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D JAMAICA PL MA
2021-07-20 617-518 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D CHARLESTN MA
2019-01-30 617-655 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D BOSTON MA
2018-01-08 617-685 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
2017-12-28 617-404 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D QUINCY MA
2011-12-09 617-936 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2011-10-19 617-637 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 JAMAICA PL MA
2010-05-17 617-807 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2009-10-16 617-419 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BOSTON MA
2009-03-31 617-858 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ROXBURY MA
2008-04-30 617-391 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2008-04-24 617-672 0–9 XXXwhole prefix which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
2007-09-27 617-963 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2007-03-30 617-756 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 BOSTON MA
2006-06-20 617-849 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2005-05-09 617-955 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2005-04-28 617-888 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2005-04-11 617-412 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2005-03-07 617-595 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2005-02-28 617-659 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
2005-02-15 617-830 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BOSTON MA
2004-11-23 617-459 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2004-11-19 617-309 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2004-11-18 617-671 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2004-09-28 617-785 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2004-09-02 617-820 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2004-08-23 617-959 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2004-08-04 617-938 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2004-07-13 617-301 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2004-06-11 617-447 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2004-05-13 617-894 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2004-05-06 617-366 0–9 XXXall 10 · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
2004-01-07 617-259 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2003-09-29 617-280 not yet reported which blocks → NEP, LLC 174A CAMBRIDGE MA
2002-10-25 617-980 none assigned yet which blocks → METROPCS, INC. 5562 MILTON MA
2002-08-08 617-324 0–9 XXXwhole prefix which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
2002-07-31 617-458 5XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 WATERTOWN MA
2002-07-31 617-935 0XXX8XXX · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE MA
2002-05-08 617-304 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
2002-02-27 617-765 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SO BOSTON MA
2001-12-26 617-961 2XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
2001-12-15 617-275 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
2001-12-15 617-386 0XXX3XXX6XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 CAMBRIDGE MA
2001-12-06 617-477 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 JAMAICA PL MA
2001-11-14 617-224 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.