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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2019-04-18 667-326-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHHILL MD
2019-04-16 667-215-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELKTON MD
2019-04-16 667-215-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELKTON MD
2019-04-16 667-215-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELKTON MD
2019-04-16 667-221-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-04-16 667-232-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENBURNIE MD
2019-04-16 667-232-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENBURNIE MD
2019-04-16 667-232-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENBURNIE MD
2019-04-16 667-232-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENBURNIE MD
2019-04-16 667-232-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENBURNIE MD
2019-04-16 667-236-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2019-04-16 667-236-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2019-04-16 667-236-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2019-04-16 667-236-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2019-04-16 667-237-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WEST RIVER MD
2019-04-16 667-237-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WEST RIVER MD
2019-04-16 667-237-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WEST RIVER MD
2019-04-16 667-237-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WEST RIVER MD
2019-04-16 667-238-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PRESTON MD
2019-04-16 667-238-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PRESTON MD
2019-04-16 667-238-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PRESTON MD
2019-04-16 667-241-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGELY MD
2019-04-16 667-241-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGELY MD
2019-04-16 667-241-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGELY MD
2019-04-16 667-253-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-04-16 667-254-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHESTERTN MD
2019-04-16 667-254-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHESTERTN MD
2019-04-16 667-254-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHESTERTN MD
2019-04-16 667-254-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHESTERTN MD
2019-04-16 667-255-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HILLSBORO MD
2019-04-16 667-255-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HILLSBORO MD
2019-04-16 667-255-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HILLSBORO MD
2019-04-16 667-255-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HILLSBORO MD
2019-04-16 667-259-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-259-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-259-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-259-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-259-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-259-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-259-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 REISTERSTN MD
2019-04-16 667-266-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-04-16 667-281-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-04-16 667-295-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CROFTON MD
2019-04-16 667-295-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CROFTON MD
2019-04-16 667-332-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-04-16 667-332-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-04-16 667-332-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-04-16 667-332-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-04-16 667-332-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-04-16 667-336-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BEL AIR 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.