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
2011-01-04 443-684-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2011-01-04 443-754-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2011-01-04 443-821-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2011-01-04 443-821-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2011-01-04 443-966-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2010-12-29 443-537-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2010-12-29 443-839-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-12-29 443-863-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-12-29 443-863-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-12-20 443-252-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PERRYVILLE MD
2010-12-17 443-853-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2010-12-17 443-863-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2010-12-16 443-860-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CATONSVL MD
2010-12-16 443-993-9XXX 9000–9999Assigned METROPCS, INC. 5562 ELKTON MD
2010-12-14 443-343-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MILLERSVL MD
2010-12-14 443-457-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BRYNPKLNCM MD
2010-12-14 443-620-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WATERLO238 MD
2010-12-14 443-937-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F UNION BDG MD
2010-12-14 443-966-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2010-12-13 443-317-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHASE MD
2010-12-07 443-377-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2010-11-23 443-390-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHURCHVL MD
2010-11-23 443-814-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-11-23 443-826-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-11-16 443-863-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2010-11-16 443-863-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2010-11-16 443-863-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2010-11-10 443-821-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WESTMINSTR MD
2010-11-09 443-319-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COLUMBIA MD
2010-11-05 443-422-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2010-11-04 443-558-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2010-11-04 443-558-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2010-11-04 443-764-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2010-11-03 443-272-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F RANDALLSTN MD
2010-11-03 443-637-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARGRGBSNIS MD
2010-11-02 443-261-6XXX 6000–6999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2010-11-02 443-261-7XXX 7000–7999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2010-11-02 443-261-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SEVERNA PK MD
2010-11-02 443-261-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SEVERNA PK MD
2010-11-02 443-333-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2010-11-02 443-371-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BEL AIR MD
2010-11-02 443-376-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DUNDALK MD
2010-11-02 443-816-3XXX 3000–3999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2010-11-02 443-816-8XXX 8000–8999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2010-11-02 443-942-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SEVERNA PK MD
2010-11-02 443-942-5XXX 5000–5999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2010-11-01 443-757-7XXX 7000–7999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2010-11-01 443-820-5XXX 5000–5999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2010-11-01 443-820-6XXX 6000–6999Assigned METROPCS, INC. 5562 ELKRIDGE MD
2010-11-01 443-820-7XXX 7000–7999Assigned METROPCS, INC. 5562 ELKRIDGE 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.