NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

9 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 484
ONVOY, LLC - PA 7
NEW CINGULAR WIRELESS PCS, LLC - DC 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1
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
2018-10-15 484-342-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-344-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-351-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-368-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-368-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-390-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-390-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-390-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-392-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-392-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-392-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-392-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-398-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN29 PA
2018-10-15 484-527-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-527-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-533-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-533-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-533-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-539-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-539-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-539-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-539-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN31 PA
2018-10-15 484-568-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-606-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LENAPE PA
2018-10-15 484-606-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LENAPE PA
2018-10-15 484-728-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-728-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN28 PA
2018-10-15 484-826-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LENAPE PA
2018-10-12 484-372-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 KEMBLESVL PA
2018-10-12 484-372-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 KEMBLESVL PA
2018-10-12 484-524-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 POTTSTOWN PA
2018-10-12 484-587-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 POTTSTOWN PA
2018-10-12 484-737-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 KENNETT SQ PA
2018-10-12 484-792-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 POTTSTOWN PA
2018-10-12 484-897-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LANDENBERG PA
2018-10-12 484-897-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LANDENBERG PA
2018-10-12 484-897-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LANDENBERG PA
2018-10-11 484-252-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EXTON PA
2018-10-11 484-295-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BIRDSBORO PA
2018-10-11 484-295-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BIRDSBORO PA
2018-10-11 484-295-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BIRDSBORO PA
2018-10-11 484-872-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EXTON PA
2018-10-11 484-872-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EXTON PA

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.