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
2021-06-15 443-484-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D EDGEWOOD MD
2021-06-15 443-656-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D COLUMBIA MD
2021-06-15 443-830-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D CATONSVL MD
2021-06-15 443-830-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D CATONSVL MD
2021-05-27 443-300-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H SYKESVILLE MD
2021-05-27 443-899-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H WATERLO238 MD
2021-05-18 443-304-5XXX 5000–5999Assigned COMMIO, LLC 939H ARBUTUS MD
2021-05-18 443-543-4XXX 4000–4999Assigned COMMIO, LLC 939H ARBUTUS MD
2021-05-18 443-568-6XXX 6000–6999Assigned COMMIO, LLC 939H ARBUTUS MD
2021-05-18 443-701-8XXX 8000–8999Assigned COMMIO, LLC 939H ARBUTUS MD
2021-05-18 443-989-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE MD
2021-05-08 443-514-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL MD
2021-05-01 443-582-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H CHURCHVL MD
2021-04-29 443-665-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H NANTICOKE MD
2021-04-27 443-575-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H ARBUTUS MD
2021-04-27 443-709-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H ARBUTUS MD
2021-04-24 443-426-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H RANDALLSTN MD
2021-04-23 443-343-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H MILLERSVL MD
2021-04-23 443-584-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H CROFTON MD
2021-04-23 443-656-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H COLUMBIA MD
2021-04-23 443-673-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BRYNPKLNCM MD
2021-04-23 443-689-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H COCKEYSVL MD
2021-04-23 443-830-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H CATONSVL MD
2021-04-21 443-212-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SPARKSGLNC MD
2021-04-21 443-302-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D CROFTON MD
2021-04-21 443-302-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D CROFTON MD
2021-04-21 443-346-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D SEVERNA PK MD
2021-04-21 443-753-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D WATERLO236 MD
2021-04-21 443-899-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WATERLO238 MD
2021-04-20 443-514-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CATONSVL MD
2021-04-16 443-666-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHESTERTN MD
2021-04-15 443-901-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2021-04-01 443-405-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2021-03-31 443-300-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2021-03-31 443-328-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2021-03-31 443-332-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D CROFTON MD
2021-03-31 443-332-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D CROFTON MD
2021-03-31 443-620-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WATERLO238 MD
2021-03-31 443-661-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WATERLO238 MD
2021-03-31 443-706-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D CRISFIELD MD
2021-03-31 443-706-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D CRISFIELD MD
2021-03-31 443-715-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D NORTH EAST MD
2021-03-31 443-715-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D NORTH EAST MD
2021-03-29 443-666-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHESTERTN MD
2021-03-23 443-337-0XXX 0000–0999Assigned METROPCS, INC. 5562 SPARROWSPT MD
2021-03-23 443-346-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERNA PK MD
2021-03-03 443-493-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D DELMAR MD
2021-03-03 443-494-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D MILLERSVL MD
2021-03-03 443-748-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D MILLERSVL MD
2021-02-23 443-294-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WEST RIVER 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.