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 667
CORE COMMUNICATIONS, INC.- MD 411
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
2019-07-15 667-230-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CENTREVL MD
2019-07-15 667-230-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CENTREVL MD
2019-07-15 667-243-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OXFORD MD
2019-07-15 667-245-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CECILTON MD
2019-07-15 667-247-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHESAPKECY MD
2019-07-15 667-248-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DENTON MD
2019-07-15 667-249-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GALENA MD
2019-07-15 667-285-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HURLOCK MD
2019-07-15 667-364-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 STEVENSVL MD
2019-07-15 667-545-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WARWICK MD
2019-07-15 667-545-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WARWICK MD
2019-07-15 667-545-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WARWICK MD
2019-07-15 667-855-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-07-15 667-855-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-07-15 667-855-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
2019-07-12 667-236-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PERRYVILLE MD
2019-07-12 667-332-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-07-12 667-332-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEWWINDSOR MD
2019-07-12 667-722-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GLENWOOD MD
2019-07-12 667-837-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2019-07-12 667-946-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHVL MD
2019-06-10 667-257-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 COLUMBIA MD
2019-06-10 667-257-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 COLUMBIA MD
2019-06-10 667-373-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-06-10 667-373-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-06-10 667-373-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-06-10 667-373-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NORTHBEACH MD
2019-06-10 667-473-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SOLOMONS MD
2019-06-10 667-473-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SOLOMONS MD
2019-06-10 667-473-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SOLOMONS MD
2019-05-22 667-382-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WINGATE MD
2019-05-22 667-382-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WINGATE MD
2019-05-22 667-382-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WINGATE MD
2019-05-22 667-382-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WINGATE MD
2019-05-16 667-222-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARGRGBSNIS MD
2019-05-16 667-222-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARGRGBSNIS MD
2019-05-16 667-333-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARGRGBSNIS MD
2019-05-16 667-333-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARGRGBSNIS MD
2019-05-06 667-264-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2019-05-06 667-264-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2019-05-06 667-264-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2019-05-06 667-264-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2019-05-06 667-264-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2019-05-06 667-264-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2019-04-18 667-326-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHHILL MD
2019-04-18 667-326-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CHURCHHILL MD
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

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.