NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 617-345 2XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-346 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-347 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
— 617-348 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-349 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-350 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-351 8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-352 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-353 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-354 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.