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
2006-05-04 443-481-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
2006-05-03 443-535-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
2006-05-01 443-228-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHASE MD
2006-05-01 443-674-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 NORTH EAST MD
2006-04-25 443-402-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2006-04-25 443-402-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2006-04-25 443-455-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2006-04-24 443-343-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J MILLERSVL MD
2006-04-21 443-388-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-04-21 443-839-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-04-21 443-839-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-04-19 443-798-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-04-19 443-798-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-04-19 443-834-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-04-19 443-841-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-04-17 443-603-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-603-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-603-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-603-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-603-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-716-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-716-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-04-17 443-747-5XXX 5000–5999Assigned BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 PT DEPOSIT MD
2006-04-14 443-316-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J WOODLAWN MD
2006-04-13 443-393-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
2006-04-10 443-249-3XXX 3000–3999Assigned IDT AMERICA, CORP. - MD 228C STEVENSVL MD
2006-04-10 443-262-8XXX 8000–8999Assigned IDT AMERICA, CORP. - MD 228C CENTREVL MD
2006-04-10 443-282-0XXX 0000–0999Assigned IDT AMERICA, CORP. - MD 228C CHESTERTN MD
2006-04-10 443-600-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2006-04-10 443-929-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PIKESVILLE MD
2006-04-07 443-380-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WOODLAWN MD
2006-04-07 443-426-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 RANDALLSTN MD
2006-04-07 443-487-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WESTMINSTR MD
2006-04-06 443-844-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-04-06 443-878-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-04-06 443-878-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-04-06 443-878-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-04-06 443-955-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-29 443-231-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ESSEX MD
2006-03-29 443-455-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2006-03-29 443-455-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 BALTIMORE MD
2006-03-29 443-763-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2006-03-28 443-419-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J GLENWOOD MD
2006-03-28 443-671-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J NEWWINDSOR MD
2006-03-28 443-693-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J PERRYVILLE MD
2006-03-22 443-204-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2006-03-22 443-643-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2006-03-22 443-643-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2006-03-22 443-643-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2006-03-22 443-643-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR 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.