NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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 951
T-MOBILE USA, INC. 120
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2015-03-09 951-438 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2015-03-09 951-448 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2015-03-09 951-463 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2015-02-18 951-462 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2015-01-12 951-456 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MIRA LOMA CA
2014-12-15 951-446 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2014-11-04 951-437 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2013-10-15 951-380 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2013-08-16 951-386 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 WOODCREST CA
2013-04-24 951-376 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2013-02-21 951-349 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2012-08-28 951-355 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2009-12-17 951-703 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MIRA LOMA CA
2009-11-30 951-525 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON CA
2007-09-11 951-229 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2007-09-11 951-230 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2007-09-11 951-234 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA
2007-06-07 951-227 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2007-02-08 951-216 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA
2007-01-17 951-210 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2007-01-17 951-213 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2006-12-05 951-207 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2006-09-18 951-823 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2006-08-21 951-570 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2006-03-07 951-385 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2006-01-26 951-260 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 HEMT HEMT CA
2006-01-24 951-691 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 MURRIETA CA
2005-12-16 951-742 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2005-12-12 951-902 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2005-10-11 951-796 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2005-08-01 951-992 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2005-07-22 951-345 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2005-07-20 951-867 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 MORENO CA
2005-05-25 951-795 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA
2005-04-07 951-581 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2005-03-30 951-445 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MURRIETA CA
2004-12-15 951-623 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2004-11-23 951-526 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA
2002-10-17 951-756 7XXX which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2002-08-01 951-454 not yet reported which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2002-08-01 951-775 not yet reported which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA
2002-06-14 951-906 none assigned yet which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2002-04-15 951-907 not yet reported which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2002-03-22 951-259 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PERRIS CA
2001-12-28 951-545 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2001-12-28 951-858 0XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CORONA CA
2001-10-18 951-757 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA
2001-09-19 951-377 none assigned yet which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2001-05-03 951-905 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2001-04-23 951-551 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TEMECULA CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.