NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

5 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, last 30 days — NPA 240
BANDWIDTH.COM CLEC, LLC - MD 3
OPENTACT INC. 1
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
2019-07-12 240-590-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2019-07-12 240-590-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2019-07-12 240-634-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2019-07-12 240-634-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2019-07-10 240-590-4XXX 4000–4999Assigned METROPCS, INC. 5562 WSNGTNZN12 MD
2019-07-09 240-653-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2019-07-02 240-524-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2019-07-02 240-524-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2019-06-29 240-591-2XXX 2000–2999Assigned METROPCS, INC. 5562 HAGERSTOWN MD
2019-06-26 240-537-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2019-06-20 240-664-1XXX 1000–1999Assigned METROPCS, INC. 5562 CUMBERLAND MD
2019-06-19 240-628-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MECHANCSVL MD
2019-06-17 240-597-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2019-06-17 240-840-7XXX 7000–7999Assigned METROPCS, INC. 5562 FREDERICK MD
2019-06-10 240-385-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MYERSVILLE MD
2019-06-10 240-414-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-414-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-414-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-414-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2019-06-10 240-465-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-465-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN2 MD
2019-06-10 240-526-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-526-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-526-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-526-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LEONARDTN MD
2019-06-10 240-597-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
2019-06-10 240-597-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
2019-06-10 240-597-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GAITHERSBG MD
2019-06-10 240-664-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-06-10 240-664-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-06-10 240-664-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CUMBERLAND MD
2019-05-30 240-692-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GRANTSVL MD
2019-05-28 240-598-3XXX 3000–3999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G HUGHESVL MD
2019-05-28 240-647-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CLEAR SPG MD
2019-05-28 240-648-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 KEEDYSVL MD
2019-05-28 240-689-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J WSNG236Z15 MD
2019-05-28 240-775-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WESTERNPT MD
2019-05-28 240-998-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HANCOCK MD
2019-05-22 240-436-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G BUCKEYSTN MD
2019-05-22 240-564-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2019-05-22 240-564-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2019-05-22 240-763-6XXX 6000–6999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WSNG238Z15 MD
2019-05-21 240-673-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2019-05-21 240-673-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2019-05-21 240-677-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD

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.