NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

17 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2020-06-04 443-884-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2020-06-04 443-884-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2020-06-04 443-884-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2020-06-03 443-662-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SPARKSGLNC MD
2020-05-26 443-329-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D WATERLO236 MD
2020-05-26 443-329-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WATERLO236 MD
2020-05-26 443-620-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WATERLO238 MD
2020-05-26 443-626-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G CHASE MD
2020-05-12 443-675-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2020-05-12 443-767-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2020-05-12 443-767-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2020-05-05 443-322-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D TOWSON MD
2020-05-05 443-704-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D ODENTON MD
2020-05-05 443-971-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D TANEYTOWN MD
2020-05-01 443-749-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D GLENBURNIE MD
2020-05-01 443-749-6XXX 6000–6999Assigned VONAGE AMERICA LLC 197D GLENBURNIE MD
2020-04-28 443-788-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2020-04-28 443-788-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2020-04-27 443-442-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PARKVILLE MD
2020-04-27 443-442-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PARKVILLE MD
2020-04-24 443-884-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2020-04-21 443-316-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOODLAWN MD
2020-04-21 443-380-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOODLAWN MD
2020-04-21 443-893-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOODLAWN MD
2020-04-15 443-688-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2020-04-15 443-688-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2020-04-15 443-688-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2020-04-10 443-679-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2020-04-10 443-685-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2020-04-08 443-661-7XXX 7000–7999Assigned HD CARRIER LLC 321J WATERLO238 MD
2020-04-07 443-568-7XXX 7000–7999Assigned HD CARRIER LLC 321J ARBUTUS MD
2020-03-31 443-218-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2020-03-31 443-222-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2020-03-31 443-222-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WORTHINGTN MD
2020-03-31 443-232-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D WILLARDS MD
2020-03-31 443-232-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WILLARDS MD
2020-03-31 443-323-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D SHARPTOWN MD
2020-03-31 443-665-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D NANTICOKE MD
2020-03-31 443-665-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D NANTICOKE MD
2020-03-31 443-665-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D NANTICOKE MD
2020-03-31 443-746-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D EASTON MD
2020-03-31 443-746-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D EASTON MD
2020-03-26 443-316-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOODLAWN MD
2020-03-25 443-431-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2020-03-25 443-596-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2020-03-25 443-788-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2020-03-25 443-946-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2020-03-09 443-396-9XXX 9000–9999Assigned METROPCS, INC. 5562 ODENTON MD
2020-03-05 443-503-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DUNDALK MD
2020-03-02 443-788-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.