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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2019-02-07 443-383-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SILVER RUN MD
2019-02-07 443-383-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SILVER RUN MD
2019-02-07 443-601-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2019-02-07 443-601-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2019-02-07 443-601-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2019-02-07 443-732-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SILVER RUN MD
2019-02-07 443-807-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2019-02-07 443-947-2XXX 2000–2999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G PERRYVILLE MD
2019-02-07 443-981-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2019-02-07 443-981-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2019-02-06 443-222-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WORTHINGTN MD
2019-02-06 443-222-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2019-02-06 443-222-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2019-02-06 443-234-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D SNOW HILL MD
2019-02-06 443-234-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SNOW HILL MD
2019-02-06 443-247-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D UNION BDG MD
2019-02-06 443-247-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D UNION BDG MD
2019-02-06 443-347-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2019-02-06 443-347-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2019-02-06 443-424-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2019-02-06 443-434-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D FEDERALSBG MD
2019-02-06 443-434-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D FEDERALSBG MD
2019-02-06 443-437-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D POCOMOKE MD
2019-02-06 443-437-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D POCOMOKE MD
2019-02-06 443-483-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2019-02-06 443-483-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2019-02-06 443-483-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CARDIFF MD
2019-02-06 443-672-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D PARKTON MD
2019-02-06 443-672-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D PARKTON MD
2019-02-06 443-781-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D ARGRGBSNIS MD
2019-02-06 443-781-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D ARGRGBSNIS MD
2019-02-06 443-788-3XXX 3000–3999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G ABERDEEN MD
2019-01-10 443-725-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PARKVILLE MD
2019-01-04 443-674-3XXX 3000–3999Assigned METROPCS, INC. 5562 NORTH EAST MD
2018-12-12 443-922-0XXX 0000–0999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2018-12-11 443-269-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2018-12-07 443-967-9XXX 9000–9999Assigned METROPCS, INC. 5562 NORTH EAST MD
2018-12-06 443-266-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENWOOD MD
2018-12-05 443-729-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOODLAWN MD
2018-11-20 443-774-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 COLUMBIA MD
2018-11-13 443-836-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2018-11-13 443-853-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2018-11-13 443-853-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2018-11-12 443-405-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J RANDALLSTN MD
2018-11-09 443-648-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ESSEX MD
2018-11-02 443-936-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKRIDGE MD
2018-10-22 443-439-0XXX 0000–0999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G TRAPPE MD
2018-10-19 443-335-2XXX 2000–2999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G BRYNPKLNCM MD
2018-10-19 443-795-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G SEVERN MD
2018-10-18 443-782-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 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.