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
2001-05-11 443-923 not yet reported which blocks → PAETEC ITEL, LLC 829J BALTIMORE MD
2001-05-11 443-969 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J ESSEX MD
2001-05-11 443-989 4XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J GLENBURNIE MD
2001-05-10 443-229 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SEVERNA PK MD
2001-05-10 443-242 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J SPARROWSPT MD
2001-05-10 443-265 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J FORK MD
2001-05-10 443-322 3XXX4XXX6XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J TOWSON MD
2001-05-10 443-544 4XXX5XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J PIKESVILLE MD
2001-05-10 443-565 2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J RANDALLSTN MD
2001-05-10 443-575 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ARBUTUS MD
2001-05-10 443-626 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J CHASE MD
2001-05-10 443-656 1XXX2XXX5XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J COLUMBIA MD
2001-05-10 443-662 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SPARKSGLNC MD
2001-05-10 443-670 2XXX4XXX6XXX7XXX which blocks → PAETEC ITEL, LLC 829J CATONSVL MD
2001-05-10 443-673 1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BRYNPKLNCM MD
2001-05-10 443-688 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SEVERN MD
2001-05-10 443-689 1XXX2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J COCKEYSVL MD
2001-05-10 443-696 1XXX2XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DUNDALK MD
2001-05-10 443-702 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J ARGRGBSNIS MD
2001-05-10 443-704 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J ODENTON MD
2001-05-09 443-332 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CROFTON MD
2001-05-09 443-442 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PARKVILLE MD
2001-04-20 443-694 0XXX2XXX8XXX which blocks → METROPCS, INC. 5562 SEVERNA PK MD
2001-04-20 443-889 8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2001-04-20 443-907 0XXX1XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ELKTON MD
2001-04-20 443-910 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2001-04-20 443-929 3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PIKESVILLE MD
2001-04-20 443-967 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 NORTH EAST MD
2001-04-17 443-366 2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 SALISBURY MD
2001-03-19 443-372 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EDGEWOOD MD
2001-03-19 443-527 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-03-19 443-998 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 PARKVILLE MD
2001-03-15 443-398 2XXX3XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 SYKESVILLE MD
2001-03-15 443-677 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-03-14 443-334 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PIKESVILLE MD
2001-03-09 443-722 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2001-02-21 443-200 2XXX3XXX5XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WOODLAWN MD
2001-02-21 443-326 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2001-02-21 443-433 1XXX2XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ANNAPOLIS MD
2001-02-21 443-576 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RANDALLSTN MD
2001-02-21 443-625 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FORK MD
2001-02-21 443-637 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARGRGBSNIS MD
2001-02-20 443-650 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REISTERSTN MD
2001-01-15 443-534 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2001-01-15 443-558 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ABERDEEN MD
2001-01-15 443-668 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2001-01-15 443-691 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2001-01-15 443-812 8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2001-01-10 443-762 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
— 443-201 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR 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.