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
2017-04-13 443-650-7XXX 7000–7999Assigned TELNYX LLC 073H REISTERSTN MD
2017-04-13 443-729-3XXX 3000–3999Assigned TELNYX LLC 073H WOODLAWN MD
2017-03-21 443-234-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D SNOW HILL MD
2017-03-21 443-249-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D STEVENSVL MD
2017-03-21 443-373-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D OCEAN CITY MD
2017-03-21 443-437-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D POCOMOKE MD
2017-03-21 443-439-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D TRAPPE MD
2017-03-21 443-888-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D PRINCEANNE MD
2017-03-20 443-282-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D CHESTERTN MD
2017-03-20 443-434-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D FEDERALSBG MD
2017-03-20 443-448-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D DENTON MD
2017-03-20 443-493-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D DELMAR MD
2017-03-20 443-592-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ELKRIDGE MD
2017-03-20 443-706-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D CRISFIELD MD
2017-03-20 443-727-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D BISHOPVL MD
2017-03-20 443-972-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D CAMBRIDGE MD
2017-03-20 443-988-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D CENTREVL MD
2017-03-16 443-914-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WORTHINGTN MD
2017-03-14 443-674-6XXX 6000–6999Assigned METROPCS, INC. 5562 NORTH EAST MD
2017-03-02 443-355-0XXX 0000–0999Assigned TELNYX LLC 073H ELLICOTTCY MD
2017-03-02 443-461-8XXX 8000–8999Assigned TELNYX LLC 073H PARKVILLE MD
2017-03-02 443-484-1XXX 1000–1999Assigned TELNYX LLC 073H EDGEWOOD MD
2017-03-02 443-541-7XXX 7000–7999Assigned TELNYX LLC 073H COCKEYSVL MD
2017-03-02 443-777-0XXX 0000–0999Assigned TELNYX LLC 073H ESSEX MD
2017-03-02 443-936-0XXX 0000–0999Assigned TELNYX LLC 073H ELKRIDGE MD
2017-03-01 443-355-5XXX 5000–5999Assigned METROPCS, INC. 5562 ELLICOTTCY MD
2017-03-01 443-712-4XXX 4000–4999Assigned METROPCS, INC. 5562 REISTERSTN MD
2017-02-28 443-598-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SHERWD FOR MD
2017-02-28 443-947-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PERRYVILLE MD
2017-02-23 443-936-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKRIDGE MD
2017-02-06 443-258-9XXX 9000–9999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G EASTON MD
2017-01-30 443-338-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SPARKSGLNC MD
2017-01-03 443-351-5XXX 5000–5999Assigned METROPCS, INC. 5562 ODENTON MD
2017-01-03 443-712-3XXX 3000–3999Assigned METROPCS, INC. 5562 REISTERSTN MD
2016-12-30 443-318-5XXX 5000–5999Assigned METROPCS, INC. 5562 COCKEYSVL MD
2016-12-30 443-355-1XXX 1000–1999Assigned METROPCS, INC. 5562 ELLICOTTCY MD
2016-12-30 443-355-3XXX 3000–3999Assigned METROPCS, INC. 5562 ELLICOTTCY MD
2016-12-30 443-512-4XXX 4000–4999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2016-12-30 443-512-5XXX 5000–5999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2016-12-30 443-744-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J REISTERSTN MD
2016-12-13 443-848-4XXX 4000–4999Assigned METROPCS, INC. 5562 GLENBURNIE MD
2016-11-25 443-213-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J PIKESVILLE MD
2016-11-22 443-679-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J SEVERN MD
2016-11-22 443-725-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD
2016-11-18 443-450-0XXX 0000–0999Assigned BARR TELL USA, INC. 964H PIKESVILLE MD
2016-11-18 443-490-8XXX 8000–8999Assigned BARR TELL USA, INC. 964H EDGEWOOD MD
2016-11-18 443-495-8XXX 8000–8999Assigned BARR TELL USA, INC. 964H PARKVILLE MD
2016-11-18 443-549-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H DUNDALK MD
2016-11-18 443-590-8XXX 8000–8999Assigned BARR TELL USA, INC. 964H REISTERSTN MD
2016-11-18 443-645-7XXX 7000–7999Assigned BARR TELL USA, INC. 964H MILLERSVL 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.