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 206
QWEST CORPORATION 243
T-MOBILE USA, INC. 95
ONVOY, LLC - WA 72
NEW CINGULAR WIRELESS PCS, LLC 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 57
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
2026-05-14 206-868 not yet reported which blocks → SHELCOMM 0051 SEATTLE WA
2026-02-20 206-927 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ACCELERATE NETWORKS LLC 147L BAINBDG IS WA
2025-11-21 206-864 0XXX5XXX6XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F DES MOINES WA
2025-10-23 206-863 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2025-10-17 206-857 5XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VASHON WA
2025-05-30 206-862 0XXX1XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → LEAP TELECOM, LLC 616J SEATTLE WA
2025-03-24 206-847 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J SEATTLE WA
2025-02-14 206-881 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WIDE VOICE, LLC - WA 707G SEATTLE WA
2025-02-10 206-846 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2025-01-09 206-807 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2024-12-30 206-845 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2024-11-01 206-843 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2024-10-15 206-840 0–9 XXXall 10 · 4 holders which blocks → WAVENATION, LLC 700J SEATTLE WA
2024-09-16 206-699 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2024-08-30 206-610 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 RICHMNDBCH WA
2024-08-06 206-609 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2023-11-20 206-608 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 RICHMNDBCH WA
2023-01-31 206-206 0–9 XXXall 10 · 3 holders which blocks → LEAP TELECOM, LLC 616J SEATTLE WA
2023-01-23 206-815 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-820 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-827 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-831 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2023-01-23 206-836 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2022-11-23 206-865 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2022-11-03 206-813 0–9 XXXall 10 · 5 holders which blocks → EON TELECOM, INC. 839J SEATTLE WA
2022-10-17 206-821 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H SEATTLE WA
2022-10-12 206-828 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E RICHMNDBCH WA
2022-08-19 206-796 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F SEATTLE WA
2022-07-28 206-647 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E RICHMNDBCH WA
2022-07-18 206-750 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SEATTLE WA
2022-07-11 206-804 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
2022-06-21 206-814 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2022-05-23 206-704 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2022-04-04 206-360 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2022-01-10 206-837 0–9 XXXall 10 · 8 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SEATTLE WA
2022-01-07 206-746 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2021-11-03 206-791 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-10-19 206-761 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMNDBCH WA
2021-10-15 206-759 0–9 XXXall 10 · 3 holders which blocks → AT&T - LOCAL 7421 BAINBDG IS WA
2021-09-27 206-756 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-09-07 206-671 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2021-08-19 206-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BAINBDG IS WA
2021-08-19 206-944 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H DES MOINES WA
2021-08-17 206-710 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-08-10 206-848 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2021-06-17 206-532 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2021-06-04 206-844 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2021-03-31 206-690 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2021-03-10 206-670 0–9 XXXall 10 · 5 holders which blocks → STRATUS NETWORKS 495J SEATTLE WA
2021-03-02 206-638 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J SEATTLE WA

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.