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
2010-01-26 443-424-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2010-01-26 443-445-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELKRIDGE MD
2010-01-26 443-457-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BRYNPKLNCM MD
2010-01-26 443-494-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MILLERSVL MD
2010-01-26 443-508-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F HAMPSTEAD MD
2010-01-26 443-620-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WATERLO238 MD
2010-01-26 443-684-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PRINCEFRCK MD
2010-01-26 443-686-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2010-01-26 443-712-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F REISTERSTN MD
2010-01-26 443-918-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TANEYTOWN MD
2010-01-25 443-539-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
2010-01-20 443-333-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2010-01-20 443-718-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2010-01-12 443-303-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2010-01-07 443-239-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2010-01-07 443-239-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2010-01-07 443-397-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2010-01-07 443-547-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2010-01-07 443-684-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2009-12-31 443-478-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2009-12-31 443-478-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2009-12-31 443-591-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE MD
2009-12-31 443-591-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE MD
2009-12-18 443-438-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2009-12-03 443-964-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NORTHBEACH MD
2009-11-19 443-239-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2009-11-03 443-832-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
2009-10-28 443-810-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2009-10-28 443-810-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2009-10-26 443-354-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 GLENBURNIE MD
2009-10-16 443-635-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-16 443-635-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-14 443-832-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2009-10-09 443-509-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-09 443-509-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-09 443-509-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-09 443-509-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-09 443-509-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2009-10-08 443-918-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 TANEYTOWN MD
2009-10-08 443-964-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 NORTHBEACH MD
2009-10-02 443-397-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2009-10-02 443-397-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY 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.