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 571
PAETEC ITEL, LLC 21
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
2016-09-26 571-371 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2011-05-25 571-553 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J LEESBURG VA
2008-03-26 571-299 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J HERNDON VA
2007-03-28 571-282 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN17 VA
2005-06-13 571-451 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2005-03-23 571-292 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J MANASSAS VA
2005-03-01 571-209 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J LEESBURG VA
2004-05-27 571-229 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J MANASSAS VA
2002-03-12 571-339 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ENGLESIDE VA
2001-12-27 571-438 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2001-05-23 571-748 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN19 VA
2001-05-23 571-749 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN17 VA
— 571-321 4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BRADDOCK VA
— 571-322 1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J ENGLESIDE VA
— 571-323 not yet reported which blocks → PAETEC ITEL, LLC 829J HERNDON VA
— 571-514 9XXX which blocks → PAETEC ITEL, LLC 829J HERNDON VA
— 571-521 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J HERNDON VA
— 571-931 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J TRIANGLE VA
— 571-932 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J LORTONMTRO VA
— 571-933 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DULLESMTRO VA
— 571-934 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DULLES VA

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.