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 513
CINCINNATI BELL 251
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 125
T-MOBILE USA, INC. 79
NEW CINGULAR WIRELESS PCS, LLC - IL 55
LEVEL 3 COMMUNICATIONS, LLC - OH 39
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
— 513-389 6XXX8XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-390 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-395 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-396 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-397 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-398 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MASON OH
— 513-403 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-404 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-405 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-406 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-407 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-408 not yet reported which blocks → SPOK, INC. 6630 CINCINNATI OH
— 513-410 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 513-412 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-414 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CINCINNATI OH
— 513-417 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-418 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-419 9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-420 6XXX7XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 MIDDLETOWN OH
— 513-421 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-422 not yet reported which blocks → OHIO BELL TEL CO 9321 MIDDLETOWN OH
— 513-423 not yet reported which blocks → OHIO BELL TEL CO 9321 MIDDLETOWN OH
— 513-424 not yet reported which blocks → OHIO BELL TEL CO 9321 MIDDLETOWN OH
— 513-425 1XXX which blocks → OHIO BELL TEL CO 9321 MIDDLETOWN OH
— 513-427 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BETHEL OH
— 513-433 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J MIDDLETOWN OH
— 513-434 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J REILY OH
— 513-435 6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MIDDLETOWN OH
— 513-436 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J WILLIAMSBG OH
— 513-437 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SEVEN MILE OH
— 513-443 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BETHANY OH
— 513-444 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LTL MIAMI OH
— 513-447 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J SHANDON OH
— 513-451 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-452 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J HARRISON OH
— 513-453 2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J LTL MIAMI OH
— 513-454 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J HAMILTON OH
— 513-455 0XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-456 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J NEWTONSVL OH
— 513-457 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BETHEL OH
— 513-458 9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-459 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MASON OH
— 513-460 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-461 0XXX2XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OXFORD OH
— 513-463 1XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BETHANY OH
— 513-464 4XXX5XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MIDDLETOWN OH
— 513-465 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MIDDLETOWN OH
— 513-467 8XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-469 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH

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.