NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 206
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 4
ACCELERATE NETWORKS LLC 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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-08-22 206-573-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-08-22 206-573-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-08-22 206-573-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-08-18 206-646-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-646-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-773-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-10 206-698-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-10 206-698-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-10 206-698-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-10 206-698-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-10 206-698-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-08 206-376-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-08-02 206-487-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2016-07-19 206-401-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F RICHMNDBCH WA
2016-07-19 206-565-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BAINBDG IS WA
2016-07-19 206-565-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BAINBDG IS WA
2016-07-15 206-460-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2016-07-14 206-460-0XXX 0000–0999Assigned ONVOY, LLC - WA 483E DES MOINES WA
2016-07-13 206-487-1XXX 1000–1999Assigned ONVOY, LLC - WA 483E SEATTLE WA
2016-07-13 206-487-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2016-07-13 206-487-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2016-07-13 206-487-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2016-07-06 206-487-7XXX 7000–7999Assigned PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F SEATTLE WA
2016-06-30 206-487-8XXX 8000–8999Assigned METROPCS, INC. 5562 SEATTLE WA
2016-06-30 206-487-9XXX 9000–9999Assigned METROPCS, INC. 5562 SEATTLE WA
2016-06-27 206-487-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-06-27 206-487-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-06-24 206-929-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2016-06-23 206-565-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - WA 006F BAINBDG IS WA
2016-06-15 206-483-0XXX 0000–0999Assigned ONVOY, LLC - WA 483E SEATTLE WA
2016-06-15 206-483-1XXX 1000–1999Assigned ONVOY, LLC - WA 483E SEATTLE WA
2016-06-15 206-483-2XXX 2000–2999Assigned ONVOY, LLC - WA 483E SEATTLE WA
2016-06-13 206-483-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-13 206-483-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-13 206-483-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-13 206-483-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-13 206-483-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-13 206-483-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-13 206-929-4XXX 4000–4999Assigned ONVOY, LLC - WA 483E DES MOINES WA
2016-06-08 206-565-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BAINBDG IS WA
2016-06-08 206-565-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BAINBDG IS WA
2016-05-24 206-483-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SEATTLE WA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.