NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 504
WIDE VOICE, LLC - LA 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2011-10-20 504-316 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2011-10-20 504-351 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2011-10-20 504-385 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-10-20 504-502 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-10-20 504-607 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-10-20 504-641 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-10-14 504-206 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 NEWORLEANS LA
2011-10-14 504-229 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-09-28 504-215 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 NEWORLEANS LA
2011-08-31 504-217 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-08-31 504-357 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2011-07-14 504-295 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 NEWORLEANS LA
2011-06-22 504-249 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 NEWORLEANS LA
2011-06-13 504-230 0–9 XXXall 10 · 6 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-06-08 504-221 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-05-05 504-699 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-03-18 504-645 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 KENNER LA
2011-03-11 504-317 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-02-25 504-800 0–9 XXXall 10 · 6 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2010-11-09 504-222 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2010-11-09 504-600 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2010-10-14 504-346 0XXX1XXX3XXX6XXX8XXX9XXX · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2010-10-12 504-300 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2010-06-16 504-327 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2010-06-07 504-345 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2009-06-09 504-264 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C NEWORLEANS LA
2008-06-16 504-252 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - LA 153F NEWORLEANS LA
2008-04-30 504-493 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA LA - LLC 653C NEWORLEANS LA
2008-03-03 504-331 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2008-03-03 504-575 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2008-01-28 504-307 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2008-01-02 504-298 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - LA 749E NEWORLEANS LA
2007-09-17 504-383 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - LA 749E NEWORLEANS LA
2007-08-23 504-359 0–9 XXXwhole prefix which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
2007-08-22 504-379 0–9 XXXwhole prefix which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
2007-06-29 504-814 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 VENICE LA
2007-05-31 504-358 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2007-04-19 504-534 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 VENICE LA
2007-04-19 504-564 0–9 XXXall 10 · 4 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
2007-04-19 504-657 0–9 XXXall 10 · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
2006-06-20 504-444 0–9 XXXall 10 · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NEWORLEANS LA
2006-04-27 504-754 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 NEWORLEANS LA
2006-03-28 504-330 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 6505 NEWORLEANS LA
2006-03-09 504-355 0–9 XXXall 10 · 5 holders which blocks → HUNT TELECOMMUNICATIONS, LLC - LA 181D NEWORLEANS LA
2006-03-07 504-322 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 NEWORLEANS LA
2006-02-22 504-373 0–9 XXXall 10 · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2006-01-16 504-667 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 KENNER LA
2006-01-05 504-333 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2006-01-03 504-655 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 6505 NEWORLEANS LA
2005-12-12 504-344 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA

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.