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
VERIZON VIRGINIA, INC. 32
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
2021-03-08 571-506 0–9 XXXall 10 · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2018-04-12 571-649 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2014-01-28 571-304 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
2013-11-26 571-452 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-11-24 571-372 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2010-04-30 571-231 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2008-10-21 571-256 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2008-04-09 571-468 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
2007-11-30 571-307 0–9 XXXall 10 · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2007-02-23 571-490 0–9 XXXall 10 · 6 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2006-11-28 571-483 0–9 XXXall 10 · 6 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2005-07-25 571-270 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2005-03-16 571-252 0–9 XXXall 10 · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 LEESBURG VA
2004-12-21 571-204 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2003-04-02 571-280 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2002-10-25 571-272 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-10-25 571-273 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-03-27 571-344 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-03-27 571-345 4XXX5XXX6XXX8XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-03-26 571-223 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 LEESBURG VA
2002-03-12 571-258 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 LEESBURG VA
2001-08-28 571-642 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 ENGLESIDE VA
2001-08-28 571-643 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
2001-05-15 571-423 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 571-203 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
— 571-218 0XXX2XXX5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 571-226 0XXX6XXX7XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 VA
— 571-431 1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
— 571-432 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
— 571-434 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
— 571-522 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 BRADDOCK VA
— 571-633 5XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN17 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.