NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 504
BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 225
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
— 504-341 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-342 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-347 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-348 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-349 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-361 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-362 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-363 9XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-364 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-365 6XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-366 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-367 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-368 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-371 2XXX5XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-374 1XXX8XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-376 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-391 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-392 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-393 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-394 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-398 4XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-410 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-412 9XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-424 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 XXXXXXXXXX LA
— 504-426 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-428 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-431 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-433 6XXX7XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-436 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-437 1XXX6XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-440 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 XXXXXXXXXX LA
— 504-441 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-443 0XXX7XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-454 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-455 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-456 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-457 7XXX8XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-459 0XXX1XXX2XXX4XXX9XXX · 3 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-461 7XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-463 6XXX8XXX9XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-464 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-465 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-466 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-467 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-468 0XXX which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-469 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-471 5XXX7XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-472 1XXX2XXX4XXX7XXX8XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 KENNER LA
— 504-482 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
— 504-483 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.