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
2019-03-15 667-727-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD
2019-03-15 667-727-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD
2019-03-15 667-727-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD
2019-03-14 667-242-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ROCK HALL MD
2019-03-14 667-242-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ROCK HALL MD
2019-03-14 667-242-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ROCK HALL MD
2019-03-14 667-242-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ROCK HALL MD
2019-03-14 667-242-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ROCK HALL MD
2019-03-14 667-243-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OXFORD MD
2019-03-14 667-243-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OXFORD MD
2019-03-14 667-243-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OXFORD MD
2019-03-14 667-245-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CECILTON MD
2019-03-14 667-245-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CECILTON MD
2019-03-14 667-245-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CECILTON MD
2019-03-14 667-248-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DENTON MD
2019-03-14 667-248-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DENTON MD
2019-03-14 667-248-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DENTON MD
2019-03-14 667-248-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DENTON MD
2019-03-14 667-249-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GALENA MD
2019-03-14 667-269-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ELKTON MD
2019-03-14 667-344-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHASE MD
2019-03-14 667-366-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAMPSTEAD MD
2019-03-14 667-366-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAMPSTEAD MD
2019-03-14 667-366-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAMPSTEAD MD
2019-03-14 667-366-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAMPSTEAD MD
2019-03-14 667-372-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CAMBRIDGE MD
2019-03-14 667-373-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-03-14 667-373-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-03-14 667-373-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-03-14 667-722-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2019-03-14 667-722-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2019-03-14 667-722-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2019-03-14 667-722-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2019-03-14 667-722-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2019-03-14 667-866-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DARLINGTON MD
2019-03-14 667-866-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DARLINGTON MD
2019-03-14 667-866-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DARLINGTON MD
2019-03-14 667-866-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DARLINGTON MD
2019-03-14 667-866-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DARLINGTON MD
2019-03-14 667-946-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2019-03-14 667-946-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2019-03-14 667-946-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2019-03-14 667-946-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2019-03-01 667-653-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BRYNPKLNCM MD
2019-02-27 667-366-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAMPSTEAD MD
2019-02-26 667-855-5XXX 5000–5999Assigned TERRA NOVA TELECOM INC. 145J SALISBURY MD
2019-02-21 667-264-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 DELMAR MD
2019-02-20 667-227-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-02-20 667-227-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-02-20 667-227-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY 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.