NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 240
CORE COMMUNICATIONS, INC.- MD 301
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
2019-07-15 240-569-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FLINTSTONE MD
2019-07-15 240-569-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FLINTSTONE MD
2019-07-15 240-617-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HIGHFIELD MD
2019-07-15 240-617-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HIGHFIELD MD
2019-07-15 240-647-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2019-07-15 240-647-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2019-07-15 240-655-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KITZMILLER MD
2019-07-15 240-655-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KITZMILLER MD
2019-07-15 240-664-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-07-15 240-664-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-07-15 240-996-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRUNSWICK MD
2019-07-15 240-996-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRUNSWICK MD
2019-07-12 240-590-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2019-07-12 240-590-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2019-07-12 240-634-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2019-07-12 240-634-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2019-06-10 240-414-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-414-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-414-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-414-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-465-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-526-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-526-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-526-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-526-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-597-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
2019-06-10 240-597-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
2019-06-10 240-597-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
2019-06-10 240-664-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-06-10 240-664-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-06-10 240-664-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-05-06 240-663-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-06 240-663-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-06 240-663-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-06 240-663-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-04-16 240-488-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
2019-04-16 240-589-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-589-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-589-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-589-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-594-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BITTINGER MD
2019-04-16 240-594-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BITTINGER MD
2019-04-16 240-648-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2019-04-16 240-648-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.