NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

70 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 667
NEW CINGULAR WIRELESS PCS, LLC - DC 38
ONVOY, LLC - MD 18
BANDWIDTH.COM CLEC, LLC - MD 6
METROPCS, INC. 2
INTRADO COMMUNICATIONS, LLC 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2018-10-17 667-686-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELLICOTTCY MD
2018-10-17 667-686-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELLICOTTCY MD
2018-10-17 667-686-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELLICOTTCY MD
2018-10-17 667-722-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2018-10-17 667-722-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2018-10-17 667-722-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2018-10-17 667-727-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD
2018-10-17 667-727-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD
2018-10-17 667-727-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD
2018-10-17 667-837-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2018-10-17 667-837-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2018-10-17 667-837-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2018-10-17 667-946-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2018-10-17 667-946-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2018-10-17 667-946-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2018-10-17 667-946-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2018-10-11 667-235-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-235-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-235-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-235-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-235-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-235-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-235-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-252-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-253-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-253-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2018-10-11 667-277-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SHERWD FOR MD
2018-10-11 667-777-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SEVERNA PK MD
2018-10-11 667-867-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 667-867-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 667-867-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 667-867-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 667-867-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 667-867-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 667-867-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-223-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-09 667-246-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CENTREVL 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.