NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

8 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 570
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7
ONVOY, LLC - PA 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
2018-05-18 570-305-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 JACKSON PA
2018-05-18 570-305-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 JACKSON PA
2018-05-18 570-305-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 JACKSON PA
2018-05-18 570-306-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 COVINGTON PA
2018-05-18 570-306-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 COVINGTON PA
2018-05-18 570-306-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 COVINGTON PA
2018-05-18 570-310-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DALLAS PA
2018-05-18 570-310-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DALLAS PA
2018-05-18 570-310-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DALLAS PA
2018-05-18 570-314-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DUSHORE PA
2018-05-18 570-314-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DUSHORE PA
2018-05-18 570-314-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 DUSHORE PA
2018-05-18 570-349-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EAGLESMERE PA
2018-05-18 570-349-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EAGLESMERE PA
2018-05-18 570-349-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 EAGLESMERE PA
2018-05-18 570-375-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LAKEWOOD PA
2018-05-18 570-375-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LAKEWOOD PA
2018-05-18 570-375-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LAKEWOOD PA
2018-05-18 570-410-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARDING PA
2018-05-18 570-410-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARDING PA
2018-05-18 570-410-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARDING PA
2018-05-18 570-438-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BROOKLYN PA
2018-05-18 570-438-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BROOKLYN PA
2018-05-18 570-438-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BROOKLYN PA
2018-05-18 570-463-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MANSFIELD PA
2018-05-18 570-463-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MANSFIELD PA
2018-05-18 570-463-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MANSFIELD PA
2018-05-18 570-475-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MOUNTANTOP PA
2018-05-18 570-475-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MOUNTANTOP PA
2018-05-18 570-475-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MOUNTANTOP PA
2018-05-18 570-487-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 OLYPHANT PA
2018-05-18 570-514-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MORRIS PA
2018-05-18 570-514-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MORRIS PA
2018-05-18 570-514-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MORRIS PA
2018-05-18 570-518-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MIFFLINBG PA
2018-05-18 570-518-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MIFFLINBG PA
2018-05-18 570-518-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MIFFLINBG PA
2018-05-18 570-528-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARFORD PA
2018-05-18 570-528-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARFORD PA
2018-05-18 570-528-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 HARFORD PA
2018-05-18 570-532-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIBERTY PA
2018-05-18 570-532-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIBERTY PA
2018-05-18 570-532-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIBERTY PA
2018-05-18 570-533-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MONTROSE PA
2018-05-18 570-533-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MONTROSE PA
2018-05-18 570-533-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MONTROSE PA
2018-05-18 570-566-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PLEASANTMT PA
2018-05-18 570-566-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PLEASANTMT PA
2018-05-18 570-566-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PLEASANTMT PA
2018-05-18 570-633-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BENTON 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.