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
2019-05-21 240-677-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-21 240-677-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2019-05-15 240-690-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
2019-05-13 240-591-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 HAGERSTOWN MD
2019-05-13 240-856-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2019-05-13 240-904-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2019-05-09 240-436-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BUCKEYSTN MD
2019-05-09 240-628-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MECHANCSVL MD
2019-05-06 240-663-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-06 240-663-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-06 240-663-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-06 240-663-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MIDDLETOWN MD
2019-05-03 240-859-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ASHTON238 MD
2019-04-25 240-862-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D MT SAVAGE MD
2019-04-18 240-563-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WSHNGTNZN5 MD
2019-04-16 240-488-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OAKLAND MD
2019-04-16 240-589-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-589-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-589-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-589-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MCCOOLE MD
2019-04-16 240-594-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BITTINGER MD
2019-04-16 240-594-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BITTINGER MD
2019-04-16 240-648-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2019-04-16 240-648-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2019-04-16 240-648-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2019-04-16 240-648-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2019-04-16 240-649-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2019-04-16 240-649-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2019-04-16 240-679-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2019-04-16 240-679-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2019-04-16 240-679-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2019-04-16 240-679-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2019-04-16 240-734-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2019-04-16 240-734-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SMITHSBURG MD
2019-04-15 240-546-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-15 240-564-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2019-04-15 240-564-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2019-04-15 240-564-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2019-04-15 240-596-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2019-04-15 240-596-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2019-04-15 240-659-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2019-04-15 240-659-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 MD
2019-04-15 240-659-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ASHTON236 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.