NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 443
PAETEC ITEL, LLC 153
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 121
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 94
NEW CINGULAR WIRELESS PCS, LLC - DC 71
LEVEL 3 COMMUNICATIONS, LLC - MD 69
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2002-08-20 443-623 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2002-07-02 443-744 8XXX which blocks → METROPCS, INC. 5562 REISTERSTN MD
2002-07-02 443-856 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 OCEAN CITY MD
2002-07-02 443-866 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2002-07-02 443-912 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 TOWSON MD
2002-07-02 443-945 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKTON MD
2002-07-02 443-983 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2002-04-19 443-865 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2002-03-06 443-624 5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2002-02-22 443-746 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EASTON MD
2002-02-22 443-747 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2001-12-19 443-864 2XXX3XXX4XXX5XXX · 2 holders which blocks → METROPCS, INC. 5562 COLUMBIA MD
2001-11-19 443-790 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2001-11-19 443-854 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-10-17 443-752 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2001-10-17 443-904 7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2001-09-24 443-837 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ANNAPOLIS MD
2001-09-24 443-850 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-09-24 443-928 5XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2001-08-21 443-830 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CATONSVL MD
2001-08-21 443-851 2XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL MD
2001-08-21 443-852 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2001-08-21 443-901 3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J TOWSON MD
2001-08-21 443-940 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J PIKESVILLE MD
2001-07-23 443-554 1XXX2XXX3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHASE MD
2001-07-23 443-600 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2001-07-23 443-614 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2001-07-23 443-739 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-07-23 443-765 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2001-07-23 443-772 5XXX6XXX which blocks → PAETEC ITEL, LLC 829J ESSEX MD
2001-07-23 443-780 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WOODLAWN MD
2001-07-23 443-799 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2001-06-20 443-403 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ABERDEEN MD
2001-06-20 443-538 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 COLUMBIA MD
2001-06-20 443-649 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SPARROWSPT MD
2001-06-20 443-676 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2001-06-20 443-985 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 RANDALLSTN MD
2001-05-18 443-430 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COLUMBIA MD
2001-05-18 443-545 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
2001-05-18 443-640 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J BEL AIR MD
2001-05-18 443-641 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
2001-05-18 443-653 3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2001-05-18 443-768 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-05-18 443-824 1XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2001-05-18 443-849 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
2001-05-11 443-748 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MILLERSVL MD
2001-05-11 443-751 2XXX which blocks → PAETEC ITEL, LLC 829J WOODLAWN MD
2001-05-11 443-757 2XXX4XXX6XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ELKRIDGE MD
2001-05-11 443-767 1XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WORTHINGTN MD
2001-05-11 443-828 2XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ELLICOTTCY MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.