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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2011-08-23 443-948-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-08-23 443-948-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-08-23 443-948-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-08-18 443-892-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NEWWINDSOR MD
2011-08-18 443-892-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NEWWINDSOR MD
2011-08-15 443-515-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CAMBRIDGE MD
2011-08-15 443-515-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CAMBRIDGE MD
2011-08-15 443-736-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALISBURY MD
2011-08-15 443-754-2XXX 2000–2999Assigned METROPCS, INC. 5562 SALISBURY MD
2011-08-15 443-892-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NEWWINDSOR MD
2011-08-11 443-477-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MD
2011-08-10 443-699-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2011-08-10 443-890-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-08-10 443-890-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-08-09 443-433-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
2011-08-08 443-422-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2011-08-08 443-625-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2011-08-08 443-625-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2011-08-08 443-671-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NEWWINDSOR MD
2011-07-29 443-574-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELLICOTTCY MD
2011-07-27 443-440-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2011-07-26 443-641-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2011-07-26 443-641-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2011-07-22 443-470-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2011-07-22 443-560-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-560-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-633-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2011-07-22 443-741-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2011-07-20 443-574-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ELLICOTTCY MD
2011-07-19 443-267-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DARLINGTON MD
2011-07-19 443-860-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CATONSVL MD
2011-07-19 443-860-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CATONSVL MD
2011-07-19 443-860-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CATONSVL MD
2011-07-18 443-424-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF 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.