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
2024-01-08 443-551-1XXX 1000–1999Assigned TERRA NOVA TELECOM INC. 145J WOODLAWN MD
2024-01-08 443-584-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J CROFTON MD
2024-01-08 443-647-0XXX 0000–0999Assigned TERRA NOVA TELECOM INC. 145J NEWWINDSOR MD
2024-01-08 443-731-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J PT DEPOSIT MD
2023-12-14 443-378-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-12-14 443-378-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-12-14 443-378-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-12-13 443-439-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TRAPPE MD
2023-12-08 443-278-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2023-12-08 443-278-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2023-12-08 443-278-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2023-12-08 443-320-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2023-12-08 443-320-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2023-11-21 443-443-0XXX 0000–0999Assigned COMMIO, LLC 939H ARBUTUS MD
2023-11-21 443-443-1XXX 1000–1999Assigned COMMIO, LLC 939H ARBUTUS MD
2023-11-21 443-443-2XXX 2000–2999Assigned COMMIO, LLC 939H ARBUTUS MD
2023-11-21 443-443-3XXX 3000–3999Assigned COMMIO, LLC 939H ARBUTUS MD
2023-11-21 443-443-4XXX 4000–4999Assigned COMMIO, LLC 939H ARBUTUS MD
2023-11-20 443-717-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-11-20 443-717-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-11-20 443-717-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-11-20 443-717-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-10-18 443-210-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J SALISBURY MD
2023-10-18 443-455-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J BALTIMORE MD
2023-09-25 443-242-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D SPARROWSPT MD
2023-09-25 443-499-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D JARRETTSVL MD
2023-09-25 443-888-5XXX 5000–5999Assigned ONVOY, LLC - MD 876D PRINCEANNE MD
2023-09-20 443-965-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-09-20 443-965-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-09-20 443-965-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-09-20 443-965-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-09-20 443-965-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-09-20 443-965-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2023-09-07 443-925-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2023-09-07 443-925-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2023-09-07 443-925-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2023-09-07 443-925-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2023-09-07 443-925-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2023-09-07 443-925-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2023-08-31 443-667-5XXX 5000–5999Assigned COMMIO, LLC 939H DELMAR MD
2023-08-31 443-667-6XXX 6000–6999Assigned COMMIO, LLC 939H DELMAR MD
2023-08-31 443-667-7XXX 7000–7999Assigned COMMIO, LLC 939H DELMAR MD
2023-08-31 443-667-8XXX 8000–8999Assigned COMMIO, LLC 939H DELMAR MD
2023-08-31 443-667-9XXX 9000–9999Assigned COMMIO, LLC 939H DELMAR MD
2023-07-14 443-218-5XXX 5000–5999Assigned TELNYX LLC 073H WORTHINGTN MD
2023-07-07 443-371-5XXX 5000–5999Assigned TERRA NOVA TELECOM INC. 145J BEL AIR MD
2023-07-07 443-689-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J COCKEYSVL MD
2023-06-20 443-953-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2023-05-16 443-667-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 DELMAR MD
2023-04-18 443-316-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D WOODLAWN 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.