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
2019-04-11 301-623-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-638-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-685-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-685-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 301-720-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-04-11 301-720-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-04-11 301-756-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2019-04-11 301-764-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-764-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2019-04-11 301-782-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-04-11 301-794-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2019-04-11 301-823-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-867-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2019-04-11 301-867-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2019-04-11 301-923-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-923-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-923-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 301-939-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-10 301-508-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MYERSVILLE MD
2019-04-08 301-941-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2019-04-05 301-234-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-05 301-234-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-05 301-234-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-05 301-719-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-05 301-719-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-05 301-719-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-03-28 301-623-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-03-28 301-623-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-03-28 301-715-0XXX 0000–0999Assigned IP HORIZON LLC 515J WSNG236Z15 MD
2019-03-28 301-715-9XXX 9000–9999Assigned IP HORIZON LLC 515J WSNG236Z15 MD
2019-03-28 301-886-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-03-28 301-886-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-03-28 301-886-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-03-28 301-886-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-03-27 301-764-8XXX 8000–8999Assigned IP HORIZON LLC 515J WALDORF MD
2019-03-27 301-936-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 301-936-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 301-936-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 301-936-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 301-936-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 301-936-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-25 301-859-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 OAKLAND MD
2019-03-15 301-238-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-03-15 301-287-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2019-03-15 301-372-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-03-14 301-936-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-13 301-242-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-03-13 301-242-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-03-13 301-835-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FREDERICK MD
2019-03-04 301-447-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EMMITSBURG 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.