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
— 617-456 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-457 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-460 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-461 none assigned yet which blocks → METROPCS, INC. 5562 CHELSEA MA
— 617-462 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DEDHAM MA
— 617-463 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 SO BOSTON MA
— 617-464 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 SO BOSTON MA
— 617-465 4XXX7XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CAMBRIDGE MA
— 617-466 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J CHELSEA MA
— 617-467 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
— 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

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.