NumberResearch Membership · Data 09/25/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/25/2026

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, all time — NPA 509
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 50
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 37
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
2026-07-02 509-788-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PROSSER WA
2021-12-17 509-208-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 YAKIMA WA
2020-09-16 509-403-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-09-16 509-403-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-09-16 509-403-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-09-16 509-403-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-09-16 509-403-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-09-16 509-403-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-06 509-409-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-05 509-407-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-05 509-407-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-05 509-407-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-05 509-407-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-05 509-407-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-05-03 509-900-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2019-01-18 509-827-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 RICHLAND WA
2019-01-18 509-827-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 RICHLAND WA
2018-08-22 509-827-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 RICHLAND WA
2018-08-22 509-827-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 RICHLAND WA
2018-06-20 509-867-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2018-06-11 509-415-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 WENATCHEE WA
2018-04-17 509-498-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHENEY WA
2016-03-25 509-404-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DAYTON WA
2016-03-25 509-745-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 DOUGLASCO WA
2015-09-02 509-381-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2015-04-10 509-820-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 KENNEWICK WA
2015-02-10 509-631-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COULEE DAM WA
2015-01-27 509-203-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GRANDVIEW WA
2015-01-27 509-852-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLE ELUM WA
2015-01-19 509-818-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2014-10-15 509-367-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 YAKIMA WA
2014-02-17 509-566-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 POMEROY WA
2013-11-21 509-349-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WARDEN WA
2013-11-21 509-383-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GRANGER WA
2013-11-21 509-497-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 BENTONCITY WA
2013-11-07 509-552-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLARKSTON WA
2013-08-27 509-415-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 WENATCHEE WA
2013-05-17 509-578-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RICHLAND WA
2013-02-27 509-822-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2013-01-31 509-797-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2012-10-11 509-491-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KENNEWICK WA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.