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 539
T-MOBILE USA, INC. 17
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
2026-06-09 539-363 7XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MOFFETT OK
2025-10-17 539-388 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
2024-06-07 539-307 0XXX1XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OKMULGEE OK
2022-04-29 539-316 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MCALESTER OK
2022-02-23 539-281 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BROKENARRW OK
2021-12-14 539-260 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BROKENARRW OK
2021-06-30 539-250 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BROKENARRW OK
2021-06-30 539-251 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRYOR OK
2021-04-14 539-246 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 TAHLEQUAH OK
2020-08-26 539-239 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MUSKOGEE OK
2019-04-15 539-230 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SALLISAW OK
2019-04-04 539-216 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHECOTAH OK
2019-04-04 539-231 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 DEWEY OK
2019-04-04 539-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 EUFAULA OK
2018-10-29 539-629 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TULSA OK
2017-10-25 539-609 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
2016-09-01 539-286 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 OKMULGEE OK

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.