NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 540
VERIZON VIRGINIA, INC. 156
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
2008-08-04 540-693 0–9 XXXall 10 · 6 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
2004-11-19 540-507 0–9 XXXall 10 · 8 holders which blocks → VERIZON VIRGINIA, INC. 9213 SPOTSYLVAN VA
— 540-206 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-224 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-245 0XXX1XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 STAUNTON VA
— 540-248 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 STAUNTON VA
— 540-253 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks → VERIZON VIRGINIA, INC. 9213 THE PLAINS VA
— 540-254 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON VIRGINIA, INC. 9213 BUCHANAN VA
— 540-262 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 CULPEPER VA
— 540-265 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-268 0XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 SHAWSVILLE VA
— 540-286 9XXX which blocks → VERIZON VIRGINIA, INC. 9213 HARTWOOD VA
— 540-296 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON VIRGINIA, INC. 9213 STONE MT VA
— 540-297 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 STONE MT VA
— 540-310 2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-324 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 STAUNTON VA
— 540-332 6XXX which blocks → VERIZON VIRGINIA, INC. 9213 STAUNTON VA
— 540-337 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 STAUNTON VA
— 540-338 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 MT GILEAD VA
— 540-341 5XXX6XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 WARRENTON VA
— 540-342 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-343 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-344 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-345 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-347 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WARRENTON VA
— 540-349 6XXX which blocks → VERIZON VIRGINIA, INC. 9213 WARRENTON VA
— 540-351 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON VIRGINIA, INC. 9213 WARRENTON VA
— 540-361 0XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-362 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-364 5XXX8XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 MARSHALL VA
— 540-366 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-368 4XXX6XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-370 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-371 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-372 0XXX2XXX5XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-373 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-374 6XXX7XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 FREDECKSBG VA
— 540-375 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 SALEM VA
— 540-378 2XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 SALEM VA
— 540-380 0XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 SALEM VA
— 540-381 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 CHRISTISBG VA
— 540-382 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 CHRISTISBG VA
— 540-384 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 SALEM VA
— 540-387 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 SALEM VA
— 540-389 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 SALEM VA
— 540-394 0XXX1XXX5XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 CHRISTISBG VA
— 540-399 0XXX which blocks → VERIZON VIRGINIA, INC. 9213 CULPEPER VA
— 540-423 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 CULPEPER VA
— 540-427 6XXX7XXX8XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 ROANOKE VA
— 540-428 5XXX6XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 WARRENTON VA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.