NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 564
T-MOBILE USA, INC. 1
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
2026-09-08 564-268 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 MT VERNON WA
2024-09-16 564-260 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON WA
2024-08-16 564-259 0XXX1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ABERDEEN WA
2024-02-16 564-258 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2023-08-11 564-206 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2022-12-12 564-228 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ABERDEEN WA
2022-11-15 564-226 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2022-10-03 564-235 3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BUCKLEY WA
2022-10-03 564-262 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LONGVIEW WA
2022-09-20 564-227 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2022-05-02 564-218 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2022-01-27 564-229 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2022-01-07 564-219 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2021-10-26 564-216 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CENTRALIA WA
2021-10-13 564-232 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2021-06-09 564-212 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ABERDEEN WA
2021-05-04 564-210 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2021-02-16 564-209 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 WHATCOMCTY WA
2021-01-19 564-244 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LONGVIEW WA
2021-01-12 564-208 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2020-12-14 564-204 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CENTRALIA WA
2020-10-27 564-202 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA

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.