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
2014-03-06 443-399-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUNDALK MD
2014-03-06 443-501-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PIKESVILLE MD
2014-03-06 443-620-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WATERLO238 MD
2014-03-06 443-787-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BEL AIR MD
2014-03-06 443-792-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRYNPKLNCM MD
2014-03-03 443-266-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENWOOD MD
2014-03-03 443-290-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PARKVILLE MD
2014-03-03 443-290-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PARKVILLE MD
2014-03-03 443-384-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PARKVILLE MD
2014-03-03 443-400-6XXX 6000–6999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2014-03-03 443-499-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F JARRETTSVL MD
2014-03-03 443-522-4XXX 4000–4999Assigned METROPCS, INC. 5562 REISTERSTN MD
2014-03-03 443-522-5XXX 5000–5999Assigned METROPCS, INC. 5562 REISTERSTN MD
2014-03-03 443-583-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2014-03-03 443-583-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2014-03-03 443-673-7XXX 7000–7999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2014-02-28 443-358-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2014-02-28 443-456-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2014-02-26 443-410-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2014-02-26 443-805-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2014-02-26 443-948-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2014-02-25 443-362-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2014-02-25 443-501-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PIKESVILLE MD
2014-02-25 443-699-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
2014-02-25 443-699-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
2014-02-25 443-903-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2014-02-25 443-953-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
2014-02-25 443-953-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
2014-02-13 443-673-2XXX 2000–2999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2014-02-13 443-673-4XXX 4000–4999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2014-02-07 443-289-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WESTMINSTR MD
2014-01-31 443-251-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CATONSVL MD
2014-01-31 443-991-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TOWSON MD
2014-01-29 443-477-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CAMBRIDGE MD
2014-01-28 443-758-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-01-28 443-905-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-01-21 443-530-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DUNDALK MD
2014-01-21 443-906-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SEVERNA PK MD
2014-01-21 443-906-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SEVERNA PK MD
2014-01-21 443-906-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SEVERNA PK MD
2014-01-20 443-566-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHESAPKECY MD
2014-01-20 443-776-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELKRIDGE MD
2014-01-20 443-776-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELKRIDGE MD
2014-01-14 443-702-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2014-01-14 443-714-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-01-13 443-593-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 ELKTON MD
2014-01-13 443-593-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 ELKTON MD
2014-01-07 443-903-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2014-01-02 443-328-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SYKESVILLE MD
2013-12-31 443-221-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ANNAPOLIS 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.