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 530
T-MOBILE USA, INC. 47
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
2026-01-07 530-775 0XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 YREKA CA
2025-10-30 530-998 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2025-04-25 530-996 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2025-03-21 530-992 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WEAVERVL CA
2024-07-12 530-983 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2024-05-22 530-981 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2023-09-26 530-972 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2023-08-23 530-971 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PLVL WEST CA
2023-07-13 530-202 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2022-02-10 530-716 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OROVILLE CA
2021-08-31 530-780 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2021-08-25 530-704 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WOODLAND CA
2021-08-23 530-785 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2020-12-16 530-703 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OROVILLE CA
2020-11-03 530-702 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODLAND CA
2020-08-27 530-382 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2019-02-19 530-608 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TRUCKEE CA
2015-11-02 530-782 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2015-10-05 530-764 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OROVILLE CA
2014-12-01 530-552 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OROVILLE CA
2014-11-24 530-786 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2012-09-14 530-379 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODLAND CA
2007-12-31 530-615 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 GRVY MAIN CA
2006-06-21 530-638 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2002-08-21 530-828 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHICO CA
2002-04-15 530-840 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 RED BLUFF CA
2002-04-15 530-863 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2002-04-15 530-933 0XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 MARYSVILLE CA
2002-03-21 530-798 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GRVY MAIN CA
2002-02-21 530-414 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TRUCKEE CA
2002-02-21 530-416 3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SOUTHTAHOE CA
2002-01-29 530-591 1XXX4XXX6XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICO CA
2001-12-26 530-220 1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DAVIS CA
2001-12-26 530-312 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WOODLAND CA
2001-09-19 530-921 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2001-06-26 530-314 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SOUTHTAHOE CA
2001-06-26 530-979 2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 DAVIS CA
2001-03-01 530-567 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 RED BLUFF CA
2001-01-25 530-415 0XXX2XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 MARYSVILLE CA
— 530-216 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARYSVILLE CA
— 530-231 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAVIS CA
— 530-308 3XXX which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
— 530-321 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHICO CA
— 530-330 4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WILLOWS CA
— 530-363 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLVL WEST CA
— 530-682 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MARYSVILLE CA
— 530-903 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PLVL WEST 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.