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 504
VOICESTREAM GSM I, LLC 81
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
2022-01-12 504-409 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2021-10-13 504-397 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2017-03-16 504-334 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2017-03-15 504-326 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2015-06-15 504-930 0–9 XXXall 10 · 6 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2014-10-30 504-509 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2013-02-28 504-478 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2013-01-30 504-505 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2012-03-28 504-413 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2012-03-01 504-408 0–9 XXXall 10 · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2012-02-03 504-405 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2012-01-24 504-360 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2011-12-13 504-563 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
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
2011-10-14 504-229 0–9 XXXall 10 · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KENNER 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
2011-06-13 504-230 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
2011-03-11 504-317 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
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
2007-05-31 504-358 0–9 XXXall 10 · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2006-02-22 504-373 0–9 XXXall 10 · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2006-01-05 504-333 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2005-12-12 504-344 0–9 XXXwhole prefix which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2005-11-18 504-758 0–9 XXXall 10 · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2002-03-12 504-329 4XXX5XXX8XXX9XXX which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2002-01-17 504-292 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2001-11-15 504-939 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2001-10-30 504-261 not yet reported which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2001-10-30 504-339 not yet reported which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2001-10-30 504-975 not yet reported which blocks → VOICESTREAM GSM I, LLC 150C NEWORLEANS LA
2001-10-16 504-906 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2001-10-02 504-994 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C KENNER LA
2001-08-24 504-338 none assigned yet which blocks → VOICESTREAM GSM I, LLC 150C KENNER 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.