NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
— 443-384 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PARKVILLE MD
— 443-385 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 EASTON MD
— 443-386 8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 443-387 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 POCOMOKE MD
— 443-389 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 SALISBURY MD
— 443-390 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F CHURCHVL MD
— 443-391 2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COCKEYSVL MD
— 443-392 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 BALTIMORE MD
— 443-393 0XXX1XXX2XXX3XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 COLUMBIA MD
— 443-394 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 PIKESVILLE MD
— 443-396 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ODENTON MD
— 443-399 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MD 876D DUNDALK MD
— 443-400 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRYNPKLNCM MD
— 443-402 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 EDGEWOOD MD
— 443-404 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 SOLOMONS MD
— 443-405 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J RANDALLSTN MD
— 443-406 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 ELKTON MD
— 443-407 3XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DUNDALK MD
— 443-408 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPARROWSPT MD
— 443-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EDGEWOOD MD
— 443-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 443-412 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CHURCHVL MD
— 443-413 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 443-414 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 443-415 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 443-416 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 443-417 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FALLSTON MD
— 443-418 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 443-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J GLENWOOD MD
— 443-420 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F ELLICOTTCY MD
— 443-421 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FORK MD
— 443-423 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
— 443-424 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CARDIFF MD
— 443-425 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 PARKVILLE MD
— 443-426 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J RANDALLSTN MD
— 443-427 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 PRINCEANNE MD
— 443-428 not yet reported which blocks → CORE COMMUNICATIONS, INC.- MD 2593 COCKEYSVL MD
— 443-429 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J WOODLAWN MD
— 443-431 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 RANDALLSTN MD
— 443-432 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J PRINCEFRCK MD
— 443-434 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H FEDERALSBG MD
— 443-436 2XXX which blocks → VERIZON MARYLAND, INC. 9212 WOODLAWN MD
— 443-440 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ANNAPOLIS MD
— 443-441 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 GLENWOOD MD
— 443-444 0–9 XXXwhole prefix which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 443-445 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 443-450 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
— 443-451 not yet reported which blocks → PAETEC ITEL, LLC 829J BALTIMORE MD
— 443-454 1XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
— 443-456 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J EDGEWOOD MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.