NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 412
CORE COMMUNICATIONS, INC. - PA 81
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
2019-04-18 412-733-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON7 PA
2019-03-13 412-274-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 CLAIRTON PA
2019-03-12 412-646-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2019-03-12 412-666-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2019-03-12 412-677-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN13 PA
2019-03-12 412-677-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN13 PA
2019-03-12 412-727-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON4 PA
2019-03-12 412-754-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN10 PA
2019-03-12 412-767-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN19 PA
2019-03-12 412-767-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN19 PA
2019-03-12 412-843-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2019-03-12 412-892-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON6 PA
2019-03-12 412-968-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN19 PA
2019-02-04 412-843-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-203-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN15 PA
2018-10-12 412-245-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-254-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON6 PA
2018-10-12 412-259-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN16 PA
2018-10-12 412-299-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN15 PA
2018-10-12 412-317-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-326-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON5 PA
2018-10-12 412-376-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-388-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON6 PA
2018-10-12 412-426-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN20 PA
2018-10-12 412-426-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN20 PA
2018-10-12 412-426-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN20 PA
2018-10-12 412-448-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON5 PA
2018-10-12 412-448-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON5 PA
2018-10-12 412-453-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN18 PA
2018-10-12 412-502-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON6 PA
2018-10-12 412-587-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON7 PA
2018-10-12 412-646-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-663-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN16 PA
2018-10-12 412-733-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON7 PA
2018-10-12 412-733-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON7 PA
2018-10-12 412-842-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-842-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-842-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-842-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-842-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-842-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-842-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-10-12 412-843-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-843-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-843-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN22 PA
2018-10-12 412-872-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN10 PA
2018-10-12 412-872-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTGSBNZN10 PA
2018-06-14 412-939-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON2 PA
2018-06-07 412-842-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA
2018-06-07 412-842-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PTTSBGZON1 PA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.