NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 509-712

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 509-712 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 509 blocks

Most active assignees, all time — NPA 509
T-MOBILE USA, INC. 3
ONVOY, LLC - WA 3
UNITED STATES CELLULAR - WA 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 1
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
2021-10-05 509-712-0XXX 0000–0999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2021-10-11 509-712-1XXX 1000–1999Assigned UNITED STATES CELLULAR - WA 6270 SUNNYSIDE WA
2021-10-18 509-712-2XXX 2000–2999Assigned ONVOY, LLC - WA 483E SUNNYSIDE WA
2021-10-18 509-712-3XXX 3000–3999Assigned ONVOY, LLC - WA 483E SUNNYSIDE WA
2021-10-18 509-712-4XXX 4000–4999Assigned ONVOY, LLC - WA 483E SUNNYSIDE WA
2022-04-28 509-712-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SUNNYSIDE WA
— 509-712-6XXX 6000–6999Available SUNNYSIDE WA
2022-01-05 509-712-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SUNNYSIDE WA
2022-01-05 509-712-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SUNNYSIDE WA
2021-04-16 509-712-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SUNNYSIDE 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.