NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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 909
T-MOBILE USA, INC. 87
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
2010-09-21 909-283 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 REDLANDS CA
2009-02-14 909-272 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2007-03-23 909-244 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 UPLAND CA
2007-02-24 909-206 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MENTONE CA
2007-01-19 909-203 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2006-03-17 909-567 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2006-03-16 909-763 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2006-01-10 909-809 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 REDLANDS CA
2005-12-16 909-961 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 RIALTO CA
2005-12-14 909-965 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2005-07-29 909-538 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 POMONA CA
2005-05-13 909-520 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2005-03-30 909-684 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2005-01-03 909-697 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2004-12-29 909-327 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2004-12-16 909-743 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2004-05-10 909-561 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2002-10-17 909-913 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2002-09-06 909-997 7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2002-08-01 909-319 not yet reported which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
2002-05-17 909-528 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 MENTONE CA
2002-05-17 909-991 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2002-02-21 909-910 not yet reported which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2001-11-29 909-964 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CLAREMONT CA
— 909-268 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-362 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HIGHLAND CA
— 909-376 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-437 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-462 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
— 909-489 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-496 none assigned yet which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
— 909-534 none assigned yet which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
— 909-589 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 CRESTLINE CA
— 909-689 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 ETIWANDA CA
— 909-721 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-772 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
— 909-805 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 MENTONE CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.