NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

17 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 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
2010-09-29 443-379-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2010-09-29 443-379-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2010-09-29 443-379-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2010-09-29 443-680-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-680-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-29 443-821-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2010-09-28 443-218-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WORTHINGTN MD
2010-09-28 443-261-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SEVERNA PK MD
2010-09-28 443-300-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SYKESVILLE MD
2010-09-28 443-304-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARBUTUS MD
2010-09-28 443-333-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2010-09-28 443-345-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ABERDEEN MD
2010-09-28 443-351-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ODENTON MD
2010-09-28 443-377-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2010-09-28 443-380-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WOODLAWN MD
2010-09-28 443-502-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F HAVREGRACE MD
2010-09-28 443-522-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F REISTERSTN MD
2010-09-28 443-574-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELLICOTTCY MD
2010-09-28 443-579-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ESSEX MD
2010-09-28 443-821-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WESTMINSTR MD
2010-09-22 443-292-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J CROFTON MD
2010-09-21 443-266-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENWOOD MD
2010-09-21 443-281-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COCKEYSVL MD
2010-09-21 443-459-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELKRIDGE MD
2010-09-21 443-721-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-721-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-750-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-750-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-750-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-750-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-750-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-750-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-814-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-21 443-814-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2010-09-20 443-964-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NORTHBEACH MD
2010-09-08 443-771-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2010-08-30 443-440-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2010-08-30 443-440-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2010-08-30 443-440-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2010-08-13 443-750-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
2010-08-11 443-863-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2010-08-06 443-360-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN 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.