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
2018-06-27 240-877-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
2018-06-27 240-972-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2018-06-27 240-972-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2018-06-26 240-531-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN3 MD
2018-06-26 240-531-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN3 MD
2018-06-26 240-531-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN3 MD
2018-06-25 240-497-7XXX 7000–7999Assigned NUSO, LLC 551G WSHNGTNZN2 MD
2018-06-25 240-831-9XXX 9000–9999Assigned NUSO, LLC 551G FREDERICK MD
2018-06-20 240-840-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H FREDERICK MD
2018-06-15 240-904-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2018-06-13 240-588-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GRANTSVL MD
2018-06-13 240-588-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GRANTSVL MD
2018-06-13 240-588-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 GRANTSVL MD
2018-06-13 240-596-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2018-06-13 240-596-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2018-06-13 240-596-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2018-06-13 240-598-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2018-06-13 240-598-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2018-06-13 240-598-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2018-06-13 240-610-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2018-06-13 240-622-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LA PLATA MD
2018-06-13 240-622-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LA PLATA MD
2018-06-13 240-622-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LA PLATA MD
2018-06-13 240-628-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MECHANCSVL MD
2018-06-13 240-628-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MECHANCSVL MD
2018-06-13 240-628-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MECHANCSVL MD
2018-06-13 240-634-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2018-06-13 240-634-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2018-06-13 240-634-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RIDGE MD
2018-06-13 240-635-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2018-06-13 240-635-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2018-06-13 240-635-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2018-06-13 240-637-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-06-13 240-637-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-06-13 240-637-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-06-13 240-647-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2018-06-13 240-647-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2018-06-13 240-647-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 CLEAR SPG MD
2018-06-13 240-648-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2018-06-13 240-648-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2018-06-13 240-648-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2018-06-13 240-649-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2018-06-13 240-649-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2018-06-13 240-649-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2018-06-12 240-590-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2018-06-12 240-590-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2018-06-12 240-590-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN12 MD
2018-06-07 240-337-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN5 MD
2018-06-07 240-337-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN5 MD
2018-06-07 240-771-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 POOLESVL 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.