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
2016-08-09 443-650-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F REISTERSTN MD
2016-08-09 443-709-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARBUTUS MD
2016-08-02 443-352-1XXX 1000–1999Assigned NUSO, LLC 551G PIKESVILLE MD
2016-08-02 443-352-9XXX 9000–9999Assigned NUSO, LLC 551G PIKESVILLE MD
2016-08-02 443-698-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ODENTON MD
2016-08-02 443-738-6XXX 6000–6999Assigned NUSO, LLC 551G PIKESVILLE MD
2016-08-02 443-898-5XXX 5000–5999Assigned NUSO, LLC 551G PIKESVILLE MD
2016-08-02 443-898-7XXX 7000–7999Assigned NUSO, LLC 551G PIKESVILLE MD
2016-07-22 443-390-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHURCHVL MD
2016-07-22 443-391-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COCKEYSVL MD
2016-07-22 443-766-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 COLUMBIA MD
2016-07-22 443-766-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 COLUMBIA MD
2016-07-22 443-819-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2016-07-22 443-967-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORTH EAST MD
2016-07-18 443-290-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PARKVILLE MD
2016-07-18 443-290-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PARKVILLE MD
2016-07-18 443-609-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SYKESVILLE MD
2016-07-07 443-298-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2016-07-06 443-490-2XXX 2000–2999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2016-07-06 443-490-3XXX 3000–3999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2016-07-06 443-947-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D PERRYVILLE MD
2016-07-06 443-947-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D PERRYVILLE MD
2016-06-28 443-652-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2016-06-23 443-856-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OCEAN CITY MD
2016-06-23 443-856-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OCEAN CITY MD
2016-06-21 443-266-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENWOOD MD
2016-06-21 443-652-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2016-06-21 443-652-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J TOWSON MD
2016-06-16 443-317-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHASE MD
2016-06-16 443-362-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2016-06-16 443-554-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHASE MD
2016-06-16 443-577-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2016-06-16 443-652-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2016-06-16 443-713-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2016-06-16 443-883-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2016-06-16 443-978-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
2016-06-16 443-978-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
2016-06-02 443-258-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2016-05-27 443-587-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2016-05-26 443-587-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2016-05-13 443-295-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PRINCEFRCK MD
2016-05-05 443-833-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ARBUTUS MD
2016-05-05 443-953-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2016-05-05 443-981-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2016-05-03 443-228-7XXX 7000–7999Assigned IP HORIZON LLC 515J CHASE MD
2016-05-03 443-231-9XXX 9000–9999Assigned IP HORIZON LLC 515J ESSEX MD
2016-05-03 443-265-8XXX 8000–8999Assigned IP HORIZON LLC 515J FORK MD
2016-05-03 443-328-8XXX 8000–8999Assigned IP HORIZON LLC 515J SYKESVILLE MD
2016-05-03 443-338-5XXX 5000–5999Assigned IP HORIZON LLC 515J SPARKSGLNC MD
2016-05-03 443-441-8XXX 8000–8999Assigned IP HORIZON LLC 515J GLENWOOD 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.