NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 301
ONVOY, LLC - MD 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
2018-10-10 301-914-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
2018-10-09 301-644-0XXX 0000–0999Assigned NUSO, LLC 551G FREDERICK MD
2018-10-08 301-368-6XXX 6000–6999Assigned TELNYX LLC 073H DAMASCS236 MD
2018-09-25 301-979-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J WSNGTNZN10 MD
2018-09-21 301-664-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2018-09-21 301-941-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2018-09-14 301-215-2XXX 2000–2999Assigned NUSO, LLC 551G WSHNGTNZN2 MD
2018-09-14 301-215-3XXX 3000–3999Assigned NUSO, LLC 551G WSHNGTNZN2 MD
2018-08-22 301-664-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2018-08-20 301-234-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D WSNGTNZN16 MD
2018-08-20 301-234-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WSNGTNZN16 MD
2018-08-13 301-215-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2018-08-13 301-347-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2018-07-19 301-746-1XXX 1000–1999Assigned METROPCS, INC. 5562 FRIENDSVL MD
2018-06-27 301-532-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2018-06-19 301-578-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2018-05-23 301-321-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-05-23 301-321-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-05-23 301-321-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-05-23 301-666-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-05-23 301-666-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-05-23 301-666-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-05-23 301-715-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z15 MD
2018-05-23 301-715-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z15 MD
2018-05-23 301-715-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z15 MD
2018-05-23 301-720-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2018-05-23 301-720-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2018-05-23 301-720-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2018-05-23 301-810-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BUCKEYSTN MD
2018-05-23 301-810-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BUCKEYSTN MD
2018-05-23 301-810-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BUCKEYSTN MD
2018-05-23 301-823-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2018-05-11 301-447-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EMMITSBURG MD
2018-05-10 301-235-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D WSNGTNZN16 MD
2018-05-10 301-723-1XXX 1000–1999Assigned METROPCS, INC. 5562 CUMBERLAND MD
2018-04-26 301-235-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H WSNGTNZN16 MD
2018-04-26 301-545-3XXX 3000–3999Assigned BARR TELL USA, INC. 964H WSNGTNZN10 MD
2018-04-26 301-578-3XXX 3000–3999Assigned BARR TELL USA, INC. 964H WSHNGTNZN3 MD
2018-04-26 301-603-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H WSNGTNZN11 MD
2018-04-26 301-941-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H WSHNGTNZN2 MD
2018-03-23 301-860-9XXX 9000–9999Assigned METROPCS, INC. 5562 WSNG236Z14 MD
2018-03-15 301-701-0XXX 0000–0999Assigned METROPCS, INC. 5562 WSNG236Z13 MD
2018-02-16 301-578-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WSHNGTNZN3 MD
2018-01-09 301-907-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2018-01-08 301-549-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2018-01-08 301-658-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2017-12-15 301-477-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WSNG236Z13 MD
2017-12-15 301-477-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WSNG236Z13 MD
2017-12-14 301-517-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D WSNGTNZN10 MD
2017-12-14 301-517-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WSNGTNZN10 MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.