NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 717
CORE COMMUNICATIONS, INC. - PA 221
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
2019-04-26 717-837-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUARRYVL PA
2019-04-18 717-481-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LANCASTER PA
2019-03-15 717-734-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EWATERFORD PA
2019-03-13 717-328-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MERCERSBG PA
2019-03-13 717-452-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MERCERSBG PA
2019-03-13 717-527-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PORT ROYAL PA
2019-03-13 717-528-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 YORK SPG PA
2019-03-13 717-687-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 STRASBURG PA
2019-03-13 717-782-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARISBGZN1 PA
2019-03-13 717-946-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 REEDSVILLE PA
2019-03-13 717-946-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 REEDSVILLE PA
2019-03-11 717-423-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWBURG PA
2019-03-07 717-474-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DAUPHIN PA
2019-03-07 717-474-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DAUPHIN PA
2019-02-13 717-276-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ANNVILLE PA
2019-02-13 717-722-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLAIN PA
2019-02-13 717-837-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUARRYVL PA
2018-10-17 717-631-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-10-17 717-631-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-10-17 717-631-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-10-17 717-631-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 RICHFIELD PA
2018-10-16 717-784-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-10-16 717-784-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-10-16 717-784-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-10-16 717-784-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-10-16 717-784-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-10-16 717-784-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILLERSTN PA
2018-10-15 717-212-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-15 717-212-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-15 717-726-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-15 717-726-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-15 717-726-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-15 717-726-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-15 717-726-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LEWISBERRY PA
2018-10-11 717-493-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DRY RUN PA
2018-10-11 717-493-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DRY RUN PA
2018-10-11 717-493-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DRY RUN PA
2018-10-11 717-493-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DRY RUN PA
2018-10-11 717-493-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DRY RUN PA
2018-10-11 717-785-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-11 717-785-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-11 717-785-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-11 717-785-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-11 717-785-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-11 717-785-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-11 717-785-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLRDGSUMMT PA
2018-10-10 717-370-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARISBGZN2 PA
2018-10-10 717-370-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARISBGZN2 PA
2018-06-13 717-486-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MTHOLLYSPG PA
2018-06-12 717-438-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ICKESBURG 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.