NumberResearch Membership · Data 09/20/2026

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 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 617-290 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-291 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
— 617-292 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-293 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-294 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J EVERETT MA
— 617-295 4XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-296 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-297 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
— 617-298 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-299 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-300 0XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 CAMBRIDGE MA
— 617-302 0–9 XXXall 10 · 4 holders which blocks → YMAX COMMUNICATIONS CORP. - MA 316E QUINCY MA
— 617-303 not yet reported which blocks → FREEDOM RING COMMUNICATIONS, LLC 8468 BOSTON MA
— 617-305 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-306 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-307 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J SO BOSTON MA
— 617-308 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-310 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-312 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-313 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MILTON MA
— 617-314 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
— 617-315 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SO BOSTON MA
— 617-316 not yet reported which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-317 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 QUINCY MA
— 617-318 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J ROXBURY MA
— 617-319 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BRIGHTON MA
— 617-320 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-321 0XXX1XXX which blocks → PAETEC ITEL, LLC 829J WATERTOWN MA
— 617-322 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J MILTON MA
— 617-323 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-325 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-326 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DORCHESTER MA
— 617-327 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-328 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-329 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WINTHROP MA
— 617-330 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-331 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
— 617-332 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-333 1XXX4XXX6XXX8XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK MA
— 617-334 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 SO BOSTON MA
— 617-335 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-336 3XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CHELSEA MA
— 617-337 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 CHARLESTN MA
— 617-338 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-339 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-341 8XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-342 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-343 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-344 3XXX4XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 JAMAICA PL 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.