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 445
CORE COMMUNICATIONS, INC. - PA 22
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
2021-09-22 445-237-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHLDLPHZN2 PA
2021-09-03 445-787-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN43 PA
2019-04-18 445-200-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUAKERTOWN PA
2019-03-13 445-222-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PENNSBURG PA
2019-03-13 445-222-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PENNSBURG PA
2019-03-13 445-222-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PENNSBURG PA
2019-03-13 445-222-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PENNSBURG PA
2019-03-13 445-222-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PENNSBURG PA
2019-03-13 445-666-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GREEN LANE PA
2019-03-13 445-666-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GREEN LANE PA
2018-06-07 445-200-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUAKERTOWN PA
2018-06-07 445-200-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUAKERTOWN PA
2018-06-07 445-200-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 QUAKERTOWN PA
2018-06-06 445-500-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN40 PA
2018-06-06 445-500-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN40 PA
2018-06-06 445-500-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN40 PA
2018-06-06 445-600-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN39 PA
2018-06-06 445-600-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN39 PA
2018-06-06 445-600-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PHPHSBZN39 PA
2018-05-11 445-222-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PENNSBURG PA
2018-05-11 445-666-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 GREEN LANE PA
2018-05-11 445-777-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 YARDLEY PA

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.