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 442
T-MOBILE USA, INC. 54
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
2026-08-20 442-502 0XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 VICTORVL CA
2026-01-16 442-496 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2025-10-30 442-494 1XXX2XXX3XXX4XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2025-10-17 442-493 2XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 VTVL HSPR CA
2024-11-08 442-442 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2024-10-09 442-478 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2024-09-12 442-473 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 VTVL HSPR CA
2024-09-12 442-474 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2024-08-29 442-470 0XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PALMDESERT CA
2024-06-25 442-467 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2024-05-31 442-462 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VTVL HSPR CA
2024-05-01 442-461 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2024-04-12 442-459 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2024-03-27 442-998 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PALMDESERT CA
2024-02-14 442-436 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2024-01-11 442-431 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2023-10-16 442-429 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 YUCCA VLY CA
2023-10-16 442-430 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 VISTA CA
2023-08-16 442-416 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS CA
2023-08-10 442-413 0XXX1XXX2XXX3XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 ENCINITAS CA
2022-07-14 442-390 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ENCINITAS CA
2022-02-28 442-378 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FALLBROOK CA
2022-01-07 442-375 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 OCSD OCSD CA
2021-11-15 442-379 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2021-10-29 442-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 INDIO CA
2021-10-28 442-364 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2021-10-26 442-368 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 VICTORVL CA
2021-09-17 442-655 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS CA
2021-05-18 442-358 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RAMONA CA
2021-03-24 442-355 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ESCONDIDO CA
2021-03-11 442-354 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2020-11-23 442-340 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2020-07-02 442-322 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2020-01-10 442-307 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 INDIO CA
2019-03-19 442-306 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 INDIO CA
2018-04-11 442-280 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BARSTOW CA
2018-03-29 442-279 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2017-06-08 442-219 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 VICTORVL CA
2017-03-29 442-218 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 LKISABELLA CA
2016-12-13 442-216 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 VISTA CA
2016-10-10 442-230 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2016-09-21 442-297 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EL CENTRO CA
2016-07-25 442-291 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VISTA CA
2016-06-10 442-294 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 RIDGECREST CA
2016-03-11 442-202 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2015-08-04 442-255 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 VICTORVL CA
2015-04-14 442-347 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 BARSTOW CA
2015-03-13 442-284 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 VICTORVL CA
2015-03-09 442-273 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 VISTA CA
2014-10-17 442-264 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 OCSD OCSD CA

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.