NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 410
ONVOY, LLC - MD 2
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
2019-06-27 410-801-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
2019-06-17 410-600-2XXX 2000–2999Assigned MCC TELEPHONY OF THE MID-ATLANTIC, LLC - MD 861F BERLIN MD
2019-06-10 410-214-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RISING SUN MD
2019-06-10 410-214-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RISING SUN MD
2019-06-06 410-936-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2019-05-22 410-835-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLARDS MD
2019-04-16 410-334-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-04-16 410-629-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2019-04-16 410-629-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BERLIN MD
2019-04-16 410-634-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGELY MD
2019-04-16 410-873-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANTICOKE MD
2019-04-16 410-873-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANTICOKE MD
2019-04-16 410-873-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANTICOKE MD
2019-04-16 410-883-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SHARPTOWN MD
2019-04-15 410-525-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-534-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-646-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-759-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-759-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-759-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-759-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-15 410-759-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2019-04-12 410-264-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-264-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-343-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SPARKSGLNC MD
2019-04-12 410-472-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SPARKSGLNC MD
2019-04-12 410-552-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SYKESVILLE MD
2019-04-12 410-557-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-557-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-575-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-575-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-592-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-592-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-593-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-593-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FORK MD
2019-04-12 410-645-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WOODLAWN MD
2019-04-12 410-645-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WOODLAWN MD
2019-04-12 410-672-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ODENTON MD
2019-04-12 410-682-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ESSEX MD
2019-04-12 410-695-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ODENTON MD
2019-04-12 410-774-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CROFTON MD
2019-04-12 410-824-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-824-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-834-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-862-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-862-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-888-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO236 MD
2019-04-12 410-994-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EDGEWOOD MD
2019-04-12 410-994-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 EDGEWOOD MD
2019-04-12 410-995-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELLICOTTCY 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.