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 219
T-MOBILE USA, INC. 49
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
2024-09-09 219-389 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PORTAGE IN
2024-08-21 219-385 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HAMMOND IN
2024-04-30 219-377 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2024-02-09 219-368 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HAMMOND IN
2024-02-09 219-371 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 HEBRON IN
2023-12-13 219-350 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PORTAGE IN
2023-07-26 219-341 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2022-02-22 219-298 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2021-08-24 219-289 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2018-10-18 219-257 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2017-06-01 219-216 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 VALPARAISO IN
2017-06-01 219-217 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WESTVILLE IN
2015-09-22 219-516 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2015-08-31 219-334 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2015-06-12 219-806 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2014-03-05 219-281 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2014-03-03 219-318 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2013-06-13 219-702 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2013-05-28 219-315 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2013-05-28 219-316 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2013-01-17 219-323 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2012-10-01 219-321 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2012-07-27 219-276 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2012-05-15 219-240 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2012-02-15 219-239 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2008-10-06 219-359 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2007-02-21 219-433 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 GARY IN
2007-02-20 219-256 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2006-06-27 219-455 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2006-01-25 219-487 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2004-03-29 219-484 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
2002-06-19 219-916 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 VALPARAISO IN
2002-04-30 219-306 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2002-04-11 219-313 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GARY IN
2002-03-14 219-588 4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 GARY IN
2002-02-11 219-801 2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 E CHICAGO IN
2001-05-31 219-308 2XXX7XXX which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2001-05-31 219-309 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 VALPARAISO IN
2001-05-04 219-448 2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WESTVILLE IN
2001-03-06 219-808 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GARY IN
2001-01-31 219-805 not yet reported which blocks → T-MOBILE USA, INC. 6529 GARY IN
2001-01-31 219-902 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GARY IN
— 219-201 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GARY IN
— 219-331 0XXX2XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PORTAGE IN
— 219-512 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GARY IN
— 219-613 2XXX which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
— 219-614 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GARY IN
— 219-678 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GARY IN
— 219-898 2XXX4XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MICHIGANCY IN

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.