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
— 617-468 3XXX7XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CAMBRIDGE MA
— 617-469 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-470 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-471 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-472 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-473 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-474 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-475 0XXX3XXX5XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-476 not yet reported which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-478 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-479 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-480 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-481 3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J QUINCY MA
— 617-482 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-483 0XXX1XXX2XXX3XXX5XXX6XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-484 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BELMONT MA
— 617-485 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MA 892D NEWTON MA
— 617-486 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BELMONT MA
— 617-487 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 BROOKLINE MA
— 617-488 9XXX which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-489 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BELMONT MA
— 617-490 0XXX1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-491 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-492 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-493 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-494 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-495 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-496 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-497 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-498 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-499 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-500 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CAMBRIDGE MA
— 617-501 none assigned yet which blocks → METROPCS, INC. 5562 SOMERVILLE MA
— 617-502 0XXX1XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-503 0XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-504 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-505 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BROOKLINE MA
— 617-506 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J DORCHESTER MA
— 617-507 3XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-508 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-509 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-510 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-512 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-513 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-514 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DORCHESTER MA
— 617-515 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-516 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROXBURY MA
— 617-517 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
— 617-519 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON 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.