NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 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
2019-07-12 301-348-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2019-07-12 301-603-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2019-07-12 301-764-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-07-12 301-764-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-07-01 301-414-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-07-01 301-414-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-07-01 301-414-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-06-26 301-291-6XXX 6000–6999Assigned METROPCS, INC. 5562 WSNG236Z14 MD
2019-06-19 301-810-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BUCKEYSTN MD
2019-06-17 301-720-2XXX 2000–2999Assigned METROPCS, INC. 5562 BRANDYWINE MD
2019-06-10 301-902-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNG236Z13 MD
2019-05-28 301-709-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J CUMBERLAND MD
2019-05-24 301-809-7XXX 7000–7999Assigned METROPCS, INC. 5562 WSNG236Z14 MD
2019-04-30 301-664-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2019-04-16 301-416-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2019-04-16 301-416-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2019-04-16 301-508-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2019-04-16 301-533-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
2019-04-16 301-859-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
2019-04-16 301-859-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
2019-04-16 301-964-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2019-04-12 301-629-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-12 301-629-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-12 301-629-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-12 301-973-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-11 301-289-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-289-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-289-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-289-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-298-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z15 MD
2019-04-11 301-348-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2019-04-11 301-348-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2019-04-11 301-358-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z15 MD
2019-04-11 301-368-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-368-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-374-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-374-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-374-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-396-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-397-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-414-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-433-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN5 MD
2019-04-11 301-446-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-482-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-482-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-489-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-574-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z15 MD
2019-04-11 301-579-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-04-11 301-623-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-623-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD

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.