NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 301
ONVOY, LLC - MD 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
2019-03-01 301-396-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WALDORF MD
2019-03-01 301-835-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FREDERICK MD
2019-03-01 301-835-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J FREDERICK MD
2019-02-07 301-962-2XXX 2000–2999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WSNGTNZN11 MD
2019-02-06 301-970-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D WSNG238Z14 MD
2019-02-06 301-970-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D WSNG238Z14 MD
2019-02-05 301-235-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WSNGTNZN16 MD
2019-02-05 301-235-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WSNGTNZN16 MD
2019-02-05 301-396-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D WALDORF MD
2019-02-05 301-638-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WALDORF MD
2018-12-20 301-835-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 FREDERICK MD
2018-12-05 301-859-5XXX 5000–5999Assigned METROPCS, INC. 5562 OAKLAND MD
2018-11-28 301-835-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D FREDERICK MD
2018-10-22 301-973-3XXX 3000–3999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WSNG238Z14 MD
2018-10-19 301-837-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z13 MD
2018-10-19 301-837-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z13 MD
2018-10-19 301-837-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z13 MD
2018-10-12 301-255-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-287-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-321-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-348-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-348-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-603-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-629-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-629-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-629-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-629-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-629-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-692-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-692-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-692-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-692-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-822-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-822-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2018-10-12 301-970-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-970-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-970-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-973-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-973-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-973-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-973-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-12 301-973-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-10-11 301-220-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2018-10-11 301-234-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 301-235-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 301-235-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 301-289-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2018-10-11 301-291-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 301-291-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 301-291-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD

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.