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
2018-06-07 240-771-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 POOLESVL MD
2018-06-07 240-771-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 POOLESVL MD
2018-06-07 240-831-2XXX 2000–2999Assigned METROPCS, INC. 5562 FREDERICK MD
2018-06-07 240-845-6XXX 6000–6999Assigned METROPCS, INC. 5562 WSNG236Z13 MD
2018-06-06 240-451-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 THURMONT MD
2018-06-05 240-639-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2018-06-05 240-639-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2018-06-05 240-639-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2018-05-25 240-553-4XXX 4000–4999Assigned METROPCS, INC. 5562 WSNG236Z13 MD
2018-05-25 240-563-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WSHNGTNZN5 MD
2018-05-25 240-831-0XXX 0000–0999Assigned METROPCS, INC. 5562 FREDERICK MD
2018-05-25 240-908-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WALKERSVL MD
2018-05-24 240-385-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2018-05-24 240-451-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 THURMONT MD
2018-05-24 240-451-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 THURMONT MD
2018-05-24 240-451-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 THURMONT MD
2018-05-24 240-509-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-05-24 240-655-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KITZMILLER MD
2018-05-24 240-655-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KITZMILLER MD
2018-05-24 240-655-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KITZMILLER MD
2018-05-24 240-657-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FROSTBURG MD
2018-05-24 240-657-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FROSTBURG MD
2018-05-24 240-657-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FROSTBURG MD
2018-05-24 240-774-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LONACONING MD
2018-05-24 240-774-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LONACONING MD
2018-05-24 240-774-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LONACONING MD
2018-05-24 240-775-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WESTERNPT MD
2018-05-24 240-775-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WESTERNPT MD
2018-05-24 240-775-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WESTERNPT MD
2018-05-24 240-784-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2018-05-24 240-784-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MYERSVILLE MD
2018-05-24 240-828-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN4 MD
2018-05-24 240-862-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MT SAVAGE MD
2018-05-24 240-862-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MT SAVAGE MD
2018-05-24 240-862-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MT SAVAGE MD
2018-05-24 240-908-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALKERSVL MD
2018-05-24 240-908-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALKERSVL MD
2018-05-24 240-908-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALKERSVL MD
2018-05-24 240-915-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEW MARKET MD
2018-05-24 240-915-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEW MARKET MD
2018-05-24 240-915-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NEW MARKET MD
2018-05-24 240-985-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLIAMSPT MD
2018-05-24 240-985-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLIAMSPT MD
2018-05-24 240-985-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLIAMSPT MD
2018-05-24 240-998-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HANCOCK MD
2018-05-24 240-998-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HANCOCK MD
2018-05-24 240-998-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HANCOCK MD
2018-05-23 240-509-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-05-23 240-509-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2018-05-23 240-546-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 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.