NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

17 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 443
ONVOY, LLC - MD 8
NEW CINGULAR WIRELESS PCS, LLC - DC 4
VERSATEL LLC 1
OPENTACT INC. 1
LEVEL 3 COMMUNICATIONS, 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
2014-10-13 443-815-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2014-10-13 443-815-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2014-10-10 443-515-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CAMBRIDGE MD
2014-10-08 443-256-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NORTH EAST MD
2014-10-08 443-256-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NORTH EAST MD
2014-10-08 443-815-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D ESSEX MD
2014-10-08 443-815-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D ESSEX MD
2014-10-07 443-973-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D ELLICOTTCY MD
2014-10-06 443-432-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D PRINCEFRCK MD
2014-10-06 443-432-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D PRINCEFRCK MD
2014-10-06 443-639-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D HAMPSTEAD MD
2014-10-06 443-639-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D HAMPSTEAD MD
2014-10-06 443-951-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 ANNAPOLIS MD
2014-10-06 443-979-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D COLUMBIA MD
2014-10-06 443-979-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D COLUMBIA MD
2014-10-03 443-432-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PRINCEFRCK MD
2014-10-03 443-702-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ARGRGBSNIS MD
2014-10-01 443-353-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COCKEYSVL MD
2014-10-01 443-969-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D ESSEX MD
2014-10-01 443-969-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D ESSEX MD
2014-09-30 443-484-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2014-09-29 443-210-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SALISBURY MD
2014-09-29 443-746-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EASTON MD
2014-09-24 443-566-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHESAPKECY MD
2014-09-24 443-666-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHESTERTN MD
2014-09-23 443-792-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D BRYNPKLNCM MD
2014-09-23 443-792-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D BRYNPKLNCM MD
2014-09-22 443-888-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PRINCEANNE MD
2014-09-18 443-543-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D ARBUTUS MD
2014-09-18 443-543-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D ARBUTUS MD
2014-09-18 443-578-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2014-09-18 443-606-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2014-09-18 443-606-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2014-09-18 443-606-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2014-09-18 443-606-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2014-09-10 443-251-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL MD
2014-09-10 443-432-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PRINCEFRCK MD
2014-09-10 443-626-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHASE MD
2014-09-10 443-787-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2014-09-10 443-815-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2014-09-10 443-870-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PIKESVILLE MD
2014-09-10 443-870-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PIKESVILLE MD
2014-09-09 443-348-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2014-09-09 443-409-6XXX 6000–6999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2014-09-09 443-409-7XXX 7000–7999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2014-09-04 443-273-4XXX 4000–4999Assigned METROPCS, INC. 5562 REISTERSTN MD
2014-09-04 443-273-6XXX 6000–6999Assigned METROPCS, INC. 5562 REISTERSTN MD
2014-09-04 443-943-5XXX 5000–5999Assigned METROPCS, INC. 5562 SPARROWSPT MD
2014-09-04 443-951-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D ANNAPOLIS MD
2014-09-03 443-201-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR 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.