NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 717
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2
TELEPORT COMMUNICATIONS AMERICA, LLC - PA 1
ONVOY, LLC - PA 1
HD CARRIER 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
2018-05-15 717-281-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EWATERFORD PA
2018-05-15 717-281-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EWATERFORD PA
2018-05-15 717-282-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PORT ROYAL PA
2018-05-15 717-282-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PORT ROYAL PA
2018-05-15 717-282-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PORT ROYAL PA
2018-05-15 717-297-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MT GRETNA PA
2018-05-15 717-301-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWBURG PA
2018-05-15 717-400-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 YORK SPG PA
2018-05-15 717-400-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 YORK SPG PA
2018-05-15 717-400-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 YORK SPG PA
2018-05-15 717-407-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GAP PA
2018-05-15 717-408-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FAIRFIELD PA
2018-05-15 717-408-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FAIRFIELD PA
2018-05-15 717-408-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FAIRFIELD PA
2018-05-15 717-452-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MERCERSBG PA
2018-05-15 717-452-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MERCERSBG PA
2018-05-15 717-452-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MERCERSBG PA
2018-05-15 717-463-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MCALISTRVL PA
2018-05-15 717-463-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MCALISTRVL PA
2018-05-15 717-482-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HUMMELSTN PA
2018-05-15 717-523-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TOWER CITY PA
2018-05-15 717-523-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TOWER CITY PA
2018-05-15 717-523-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TOWER CITY PA
2018-05-15 717-567-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWPORT PA
2018-05-15 717-568-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LITITZ PA
2018-05-15 717-631-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-05-15 717-631-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-05-15 717-631-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-05-15 717-744-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 JEFFERSON PA
2018-05-15 717-744-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 JEFFERSON PA
2018-05-15 717-748-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ST THOMAS PA
2018-05-15 717-748-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ST THOMAS PA
2018-05-15 717-748-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ST THOMAS PA
2018-05-15 717-784-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-05-15 717-784-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-05-15 717-784-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-05-15 717-837-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUARRYVL PA
2018-05-15 717-864-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 WRIGHTSVL PA
2018-05-15 717-895-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GREENCASTL PA
2018-05-15 717-895-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GREENCASTL PA
2018-05-15 717-895-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GREENCASTL PA
2018-05-15 717-906-7XXX 7000–7999Assigned ONVOY, LLC - PA 547E CARLISLE PA
2018-05-15 717-922-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 THOMPSONTN PA
2018-05-15 717-922-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 THOMPSONTN PA
2018-05-15 717-922-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 THOMPSONTN PA
2018-05-15 717-946-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 REEDSVILLE PA
2018-05-15 717-946-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 REEDSVILLE PA
2018-05-15 717-946-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 REEDSVILLE PA
2018-05-15 717-966-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWVILLE PA
2018-05-15 717-966-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWVILLE 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.