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
2018-05-18 570-633-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BENTON PA
2018-05-18 570-633-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BENTON PA
2018-05-18 570-667-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MUHLENBURG PA
2018-05-18 570-667-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MUHLENBURG PA
2018-05-18 570-667-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MUHLENBURG PA
2018-05-18 570-718-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 KINGSTON PA
2018-05-18 570-749-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILL HALL PA
2018-05-18 570-749-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILL HALL PA
2018-05-18 570-749-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MILL HALL PA
2018-05-18 570-771-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PLYMOUTH PA
2018-05-18 570-771-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PLYMOUTH PA
2018-05-18 570-771-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PLYMOUTH PA
2018-05-18 570-773-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MAHANOY CY PA
2018-05-18 570-773-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MAHANOY CY PA
2018-05-18 570-773-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MAHANOY CY PA
2018-05-18 570-781-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLOSSBURG PA
2018-05-18 570-781-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLOSSBURG PA
2018-05-18 570-781-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BLOSSBURG PA
2018-05-18 570-782-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWMILFORD PA
2018-05-18 570-782-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWMILFORD PA
2018-05-18 570-782-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWMILFORD PA
2018-05-18 570-792-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 OVAL PA
2018-05-18 570-792-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 OVAL PA
2018-05-18 570-792-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 OVAL PA
2018-05-18 570-803-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 JERMYN PA
2018-05-18 570-813-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LE RAYSVL PA
2018-05-18 570-813-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LE RAYSVL PA
2018-05-18 570-813-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LE RAYSVL PA
2018-05-18 570-896-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ESTELLA PA
2018-05-18 570-896-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ESTELLA PA
2018-05-18 570-896-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ESTELLA PA
2018-05-18 570-913-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEW ALBANY PA
2018-05-18 570-913-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEW ALBANY PA
2018-05-18 570-913-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEW ALBANY PA
2018-05-18 570-919-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BEECHCREEK PA
2018-05-18 570-919-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BEECHCREEK PA
2018-05-18 570-919-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BEECHCREEK PA
2018-05-14 570-652-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TREMONT PA
2018-05-14 570-652-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TREMONT PA
2018-05-14 570-652-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TREMONT PA
2018-05-14 570-653-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 VALLEYVIEW PA
2018-05-14 570-653-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 VALLEYVIEW PA
2018-05-14 570-653-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 VALLEYVIEW PA
2018-05-11 570-672-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F ELYSBURG PA
2018-05-11 570-936-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F CARBONDALE PA
2018-05-04 570-365-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F MTPLSANTML PA
2018-05-04 570-429-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F ST CLAIR PA
2018-05-02 570-293-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F DANVILLE PA
2018-05-02 570-917-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F SUNBURY PA
2018-04-19 570-491-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - PA 002F MATAMORAS 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.