NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 224
T-MOBILE USA, INC. 138
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
2026-06-16 224-691 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 WHEELING IL
2026-01-12 224-679 7XXX which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-11-17 224-672 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-11-05 224-671 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-10-03 224-670 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-09-10 224-669 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-08-12 224-663 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-06-17 224-652 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-06-06 224-647 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2025-01-07 224-631 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2024-08-21 224-614 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2024-07-31 224-224 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DESPLAINES IL
2024-03-07 224-591 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BENSENVL IL
2024-01-05 224-537 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DESPLAINES IL
2023-07-28 224-468 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2022-09-26 224-486 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2022-04-01 224-460 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2022-03-22 224-459 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LIBERTYVL IL
2022-02-22 224-454 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2021-10-11 224-431 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-09-22 224-418 7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ELK GROVE IL
2021-08-03 224-391 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-08-03 224-396 0XXX3XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BARRINGTON IL
2021-08-03 224-397 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALGONQUIN IL
2021-07-07 224-390 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ROUND LAKE IL
2021-05-14 224-384 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2021-01-14 224-369 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 WAUKEGAN IL
2021-01-13 224-349 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2020-12-11 224-368 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2020-09-30 224-363 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2018-10-22 224-295 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PALATINE IL
2018-10-19 224-294 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LIBERTYVL IL
2018-01-31 224-284 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DEERFIELD IL
2017-03-20 224-322 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2017-03-20 224-529 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GLENVIEW IL
2016-12-12 224-605 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN IL
2016-12-12 224-607 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-11-11 224-421 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2016-11-11 224-428 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALGONQUIN IL
2015-10-23 224-540 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROUND LAKE IL
2015-06-26 224-258 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2015-05-22 224-469 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 WAUKEGAN IL
2015-02-20 224-517 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BARRINGTON IL
2015-02-20 224-716 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ALGONQUIN IL
2015-01-21 224-518 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLIGTNHTS IL
2015-01-08 224-516 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LAKEFOREST IL
2014-11-14 224-504 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LIBERTYVL IL
2014-11-07 224-435 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GLENVIEW IL
2014-11-06 224-727 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DEERFIELD IL
2014-10-24 224-479 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 NORTHBROOK IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.