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
PAETEC ITEL, LLC 44
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
2011-12-09 617-936 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2010-05-17 617-807 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2008-04-30 617-391 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2004-11-19 617-309 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
2001-10-11 617-340 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
2001-05-02 617-658 3XXX4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
2001-02-22 617-544 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J EVERETT MA
2001-02-16 617-286 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CHARLESTN MA
2001-02-16 617-409 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CHELSEA MA
2001-02-16 617-410 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J EVERETT MA
— 617-202 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J BRIGHTON MA
— 617-221 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J QUINCY MA
— 617-226 7XXX8XXX which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-274 8XXX which blocks → PAETEC ITEL, LLC 829J BROOKLINE MA
— 617-307 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J SO BOSTON MA
— 617-313 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MILTON MA
— 617-318 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J ROXBURY MA
— 617-321 0XXX1XXX which blocks → PAETEC ITEL, LLC 829J WATERTOWN MA
— 617-336 3XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CHELSEA MA
— 617-383 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J BROOKLINE MA
— 617-440 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SOMERVILLE MA
— 617-455 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EASTBOSTON MA
— 617-456 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-467 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
— 617-502 0XXX1XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-506 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J DORCHESTER MA
— 617-532 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-564 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
— 617-581 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
— 617-651 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BROOKLINE MA
— 617-657 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J QUINCY MA
— 617-715 not yet reported which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-758 1XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-778 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-801 9XXX which blocks → PAETEC ITEL, LLC 829J QUINCY MA
— 617-833 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J HYDE PARK MA
— 617-844 not yet reported which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-871 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-902 0XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-903 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BRIGHTON MA
— 617-904 8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-933 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-979 not yet reported which blocks → PAETEC ITEL, LLC 829J DORCHESTER MA
— 617-986 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON 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.