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
2016-03-14 443-331-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D TANEYTOWN MD
2016-03-14 443-647-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D NEWWINDSOR MD
2016-03-14 443-647-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D NEWWINDSOR MD
2016-03-14 443-888-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 PRINCEANNE MD
2016-03-14 443-960-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2016-03-11 443-420-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D ELLICOTTCY MD
2016-03-11 443-420-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D ELLICOTTCY MD
2016-03-11 443-730-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2016-03-11 443-730-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D ESSEX MD
2016-03-09 443-342-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SOLOMONS MD
2016-03-09 443-419-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D GLENWOOD MD
2016-03-09 443-419-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D GLENWOOD MD
2016-03-08 443-313-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D FORK MD
2016-03-08 443-313-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D FORK MD
2016-03-08 443-342-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D SOLOMONS MD
2016-03-08 443-533-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D JARRETTSVL MD
2016-03-08 443-533-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D JARRETTSVL MD
2016-03-04 443-501-8XXX 8000–8999Assigned NUSO, LLC 551G PIKESVILLE MD
2016-03-02 443-247-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D UNION BDG MD
2016-03-02 443-247-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D UNION BDG MD
2016-03-01 443-338-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D SPARKSGLNC MD
2016-03-01 443-338-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SPARKSGLNC MD
2016-03-01 443-516-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2016-03-01 443-516-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2016-02-29 443-383-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D SILVER RUN MD
2016-02-29 443-383-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D SILVER RUN MD
2016-02-29 443-920-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2016-02-29 443-920-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2016-02-25 443-412-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D CHURCHVL MD
2016-02-25 443-457-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D BRYNPKLNCM MD
2016-02-25 443-457-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D BRYNPKLNCM MD
2016-02-25 443-464-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D CHURCHVL MD
2016-02-25 443-464-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D CHURCHVL MD
2016-02-25 443-489-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D CHASE MD
2016-02-25 443-489-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D CHASE MD
2016-02-25 443-526-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D HAVREGRACE MD
2016-02-25 443-526-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D HAVREGRACE MD
2016-02-25 443-594-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D SPARROWSPT MD
2016-02-25 443-594-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D SPARROWSPT MD
2016-02-25 443-645-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D MILLERSVL MD
2016-02-25 443-645-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D MILLERSVL MD
2016-02-24 443-238-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D PARKTON MD
2016-02-24 443-238-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D PARKTON MD
2016-02-24 443-331-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D TANEYTOWN MD
2016-02-24 443-331-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D TANEYTOWN MD
2016-02-24 443-601-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D FALLSTON MD
2016-02-24 443-601-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D FALLSTON MD
2016-02-24 443-646-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D NORTHBEACH MD
2016-02-24 443-646-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D NORTHBEACH MD
2016-02-23 443-291-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D HAMPSTEAD 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.