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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 513-742 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-744 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-745 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-749 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-751 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-752 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-753 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-754 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MASON OH
— 513-755 not yet reported which blocks → CINCINNATI BELL 9348 BETHANY OH
— 513-756 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CINCINNATI BELL 9348 REILY OH
— 513-757 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CINCINNATI BELL 9348 REILY OH
— 513-758 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-759 not yet reported which blocks → CINCINNATI BELL 9348 BETHANY OH
— 513-761 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-762 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-763 9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-765 0XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-766 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CINCINNATI OH
— 513-768 2XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-769 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-770 0XXX1XXX2XXX9XXX · 2 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B MASON OH
— 513-771 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-772 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-773 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HAMILTON OH
— 513-774 not yet reported which blocks → CINCINNATI BELL 9348 LTL MIAMI OH
— 513-777 not yet reported which blocks → CINCINNATI BELL 9348 BETHANY OH
— 513-779 not yet reported which blocks → CINCINNATI BELL 9348 BETHANY OH
— 513-780 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-782 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-783 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MIDDLETOWN OH
— 513-784 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-785 0XXX8XXX9XXX · 2 holders which blocks → CINCINNATI BELL 9348 HAMILTON OH
— 513-786 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-787 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-788 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 HARRISON OH
— 513-789 not yet reported which blocks → OH
— 513-791 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-792 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-793 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-794 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-796 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MORNINGSUN OH
— 513-797 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-798 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - OH 0615 MORNINGSUN OH
— 513-804 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MIDDLETOWN OH
— 513-805 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HAMILTON OH
— 513-807 not yet reported which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 513-812 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J LEBANON OH
— 513-819 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CINCINNATI OH
— 513-820 not yet reported which blocks → CINCINNATI BELL 9348 HAMILTON 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.