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
Clear Download CSV ↓
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 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.