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
2013-05-21 443-325-3XXX 3000–3999Assigned METROPCS, INC. 5562 ELLICOTTCY MD
2013-05-21 443-354-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENBURNIE MD
2013-05-21 443-400-3XXX 3000–3999Assigned METROPCS, INC. 5562 BRYNPKLNCM MD
2013-05-21 443-409-1XXX 1000–1999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2013-05-21 443-409-2XXX 2000–2999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2013-05-21 443-589-4XXX 4000–4999Assigned METROPCS, INC. 5562 COCKEYSVL MD
2013-05-21 443-709-7XXX 7000–7999Assigned METROPCS, INC. 5562 ARBUTUS MD
2013-05-21 443-741-5XXX 5000–5999Assigned METROPCS, INC. 5562 COLUMBIA MD
2013-05-21 443-741-6XXX 6000–6999Assigned METROPCS, INC. 5562 COLUMBIA MD
2013-05-21 443-833-7XXX 7000–7999Assigned METROPCS, INC. 5562 ARBUTUS MD
2013-05-20 443-720-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ABERDEEN MD
2013-05-06 443-354-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2013-04-26 443-967-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORTH EAST MD
2013-04-25 443-784-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2013-04-23 443-578-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2013-04-23 443-985-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2013-04-18 443-456-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2013-04-18 443-551-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2013-04-18 443-714-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ANNAPOLIS MD
2013-04-12 443-391-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2013-04-12 443-391-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2013-04-12 443-391-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2013-04-09 443-464-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G CHURCHVL MD
2013-04-09 443-464-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G CHURCHVL MD
2013-04-05 443-294-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WEST RIVER MD
2013-04-05 443-429-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WOODLAWN MD
2013-04-05 443-429-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WOODLAWN MD
2013-04-05 443-607-5XXX 5000–5999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WEST RIVER MD
2013-04-05 443-609-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SYKESVILLE MD
2013-04-05 443-609-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SYKESVILLE MD
2013-04-05 443-636-4XXX 4000–4999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G CATONSVL MD
2013-04-05 443-662-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SPARKSGLNC MD
2013-04-05 443-662-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SPARKSGLNC MD
2013-04-05 443-860-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G CATONSVL MD
2013-04-05 443-899-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WATERLO238 MD
2013-04-05 443-899-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WATERLO238 MD
2013-04-05 443-914-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WORTHINGTN MD
2013-04-05 443-914-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WORTHINGTN MD
2013-04-05 443-937-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G UNION BDG MD
2013-04-05 443-937-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G UNION BDG MD
2013-04-05 443-943-0XXX 0000–0999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SPARROWSPT MD
2013-04-05 443-943-1XXX 1000–1999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SPARROWSPT MD
2013-04-05 443-952-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WESTMINSTR MD
2013-04-05 443-952-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WESTMINSTR MD
2013-04-05 443-971-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G TANEYTOWN MD
2013-04-05 443-971-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G TANEYTOWN MD
2013-04-04 443-252-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G PERRYVILLE MD
2013-04-04 443-252-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G PERRYVILLE MD
2013-04-04 443-267-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G DARLINGTON MD
2013-04-04 443-313-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G FORK 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.