NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 410
ONVOY, LLC - MD 2
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
2018-12-11 410-453-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-11 410-453-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-11 410-453-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-11 410-512-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-11 410-832-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-11 410-938-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-11 410-938-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-05 410-816-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2018-11-09 410-307-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-11-09 410-307-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-11-09 410-307-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-11-09 410-716-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-11-09 410-716-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-11-09 410-716-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-11-07 410-938-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2018-10-17 410-892-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE MD
2018-10-11 410-237-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2018-10-11 410-904-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO238 MD
2018-10-11 410-904-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WATERLO238 MD
2018-10-09 410-403-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 COCKEYSVL MD
2018-09-19 410-204-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARBUTUS MD
2018-09-14 410-307-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-09-14 410-307-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-09-11 410-994-6XXX 6000–6999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2018-08-20 410-376-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D VIENNA MD
2018-08-20 410-397-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D WINGATE MD
2018-08-20 410-632-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D SNOW HILL MD
2018-08-03 410-329-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-08-03 410-403-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-08-03 410-628-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-08-03 410-683-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-08-03 410-683-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-07-23 410-316-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COCKEYSVL MD
2018-06-25 410-237-0XXX 0000–0999Assigned NUSO, LLC 551G BALTIMORE MD
2018-05-24 410-520-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 OCEAN CITY MD
2018-05-23 410-214-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RISING SUN MD
2018-05-23 410-214-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RISING SUN MD
2018-05-23 410-214-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 RISING SUN MD
2018-05-23 410-314-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARBUTUS MD
2018-05-23 410-314-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARBUTUS MD
2018-05-23 410-501-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 ARBUTUS MD
2018-05-22 410-801-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2018-05-17 410-307-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-05-17 410-816-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-05-17 410-816-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-05-17 410-816-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-05-17 410-816-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-05-17 410-816-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-05-11 410-694-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENBURNIE MD
2018-05-01 410-657-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 PARKVILLE 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.