Thousands-blocks in 571-522

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 571-522 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 571 blocks

Most active assignees, all time — NPA 571

YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA 6

VERIZON VIRGINIA, INC. 3

PAETEC ITEL, LLC 1

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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2007-05-23	571-522-0XXX	0000–0999	Assigned	YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA	367E	BRADDOCK	VA
—	571-522-1XXX	1000–1999	Reserved	VERIZON VIRGINIA, INC.	9213	BRADDOCK	VA
2006-03-29	571-522-2XXX	2000–2999	Assigned	PAETEC ITEL, LLC	829J	BRADDOCK	VA
2007-05-23	571-522-3XXX	3000–3999	Assigned	YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA	367E	BRADDOCK	VA
2007-05-23	571-522-4XXX	4000–4999	Assigned	YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA	367E	BRADDOCK	VA
—	571-522-5XXX	5000–5999	Reserved	VERIZON VIRGINIA, INC.	9213	BRADDOCK	VA
—	571-522-6XXX	6000–6999	Reserved	VERIZON VIRGINIA, INC.	9213	BRADDOCK	VA
2007-05-23	571-522-7XXX	7000–7999	Assigned	YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA	367E	BRADDOCK	VA
2007-05-23	571-522-8XXX	8000–8999	Assigned	YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA	367E	BRADDOCK	VA
2007-05-23	571-522-9XXX	9000–9999	Assigned	YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA	367E	BRADDOCK	VA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.