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
2006-03-20 443-955-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-16 443-332-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CROFTON MD
2006-03-15 443-806-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-03-14 443-694-8XXX 8000–8999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2006-03-14 443-798-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2006-03-13 443-343-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 MILLERSVL MD
2006-03-13 443-371-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J BEL AIR MD
2006-03-07 443-925-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-03-07 443-925-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-03-07 443-925-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-03-06 443-262-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CENTREVL MD
2006-03-06 443-517-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2006-03-06 443-605-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2006-03-06 443-617-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2006-03-06 443-797-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2006-03-06 443-834-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2006-03-06 443-841-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2006-03-06 443-841-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2006-03-06 443-844-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-06 443-844-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-06 443-844-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-06 443-844-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-06 443-844-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-03-06 443-878-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-03-02 443-203-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WEST RIVER MD
2006-03-02 443-600-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2006-03-01 443-925-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2006-02-28 443-430-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
2006-02-24 443-371-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BEL AIR MD
2006-02-24 443-844-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2006-02-22 443-486-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PRINCEFRCK MD
2006-02-22 443-844-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-02-17 443-426-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J RANDALLSTN MD
2006-02-17 443-433-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-02-17 443-433-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-02-17 443-433-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-02-17 443-912-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-17 443-912-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-17 443-912-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-17 443-921-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-17 443-921-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-17 443-921-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-15 443-844-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-02-15 443-844-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-02-08 443-218-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WORTHINGTN MD
2006-02-08 443-671-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 NEWWINDSOR MD
2006-02-08 443-693-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PERRYVILLE MD
2006-02-08 443-731-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PT DEPOSIT MD
2006-02-08 443-912-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-02-08 443-912-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON 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.