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
2011-06-07 443-897-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2011-06-07 443-924-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2011-06-07 443-930-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2011-06-07 443-945-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELKTON MD
2011-06-02 443-475-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
2011-06-02 443-475-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
2011-05-26 443-732-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SILVER RUN MD
2011-05-24 443-613-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2011-05-20 443-747-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PT DEPOSIT MD
2011-05-17 443-289-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WESTMINSTR MD
2011-05-17 443-289-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WESTMINSTR MD
2011-05-13 443-842-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2011-05-06 443-993-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKTON MD
2011-05-06 443-993-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKTON MD
2011-05-04 443-424-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2011-05-04 443-454-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2011-05-04 443-454-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2011-05-04 443-516-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SYKESVILLE MD
2011-05-04 443-599-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SEVERN MD
2011-05-04 443-608-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2011-05-04 443-675-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F RANDALLSTN MD
2011-05-04 443-675-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F RANDALLSTN MD
2011-05-04 443-698-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ODENTON MD
2011-05-04 443-770-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARGRGBSNIS MD
2011-05-04 443-770-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARGRGBSNIS MD
2011-05-04 443-821-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WESTMINSTR MD
2011-05-04 443-973-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELLICOTTCY MD
2011-04-20 443-379-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PIKESVILLE MD
2011-04-20 443-379-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PIKESVILLE MD
2011-04-20 443-535-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2011-04-20 443-595-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SPARKSGLNC MD
2011-04-20 443-741-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2011-04-20 443-842-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2011-04-20 443-842-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2011-04-20 443-842-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2011-04-14 443-773-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BRYNPKLNCM MD
2011-04-14 443-990-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-14 443-990-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-14 443-990-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-14 443-990-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-14 443-990-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-13 443-897-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-13 443-897-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-13 443-897-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-13 443-897-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2011-04-08 443-608-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2011-04-07 443-930-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-07 443-930-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-07 443-930-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-04-07 443-930-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE 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.