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 513
CINCINNATI BELL 251
CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 9
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
— 513-686 0XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-688 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-697 not yet reported which blocks → CINCINNATI BELL 9348 LTL MIAMI OH
— 513-698 2XXX5XXX8XXX · 2 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-721 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-722 5XXX6XXX which blocks → CINCINNATI BELL 9348 LTL MIAMI OH
— 513-723 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-724 4XXX which blocks → CINCINNATI BELL 9348 WILLIAMSBG OH
— 513-726 2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → CINCINNATI BELL 9348 SEVEN MILE OH
— 513-728 0XXX1XXX5XXX9XXX · 2 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-729 6XXX7XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-731 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-732 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-733 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-734 5XXX8XXX · 2 holders which blocks → CINCINNATI BELL 9348 BETHEL OH
— 513-735 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-736 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-737 not yet reported which blocks → CINCINNATI BELL 9348 HAMILTON OH
— 513-738 6XXX which blocks → CINCINNATI BELL 9348 SHANDON OH
— 513-741 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 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
— 513-755 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
— 513-768 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
— 513-774 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
— 513-782 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI 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
— 513-791 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-792 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH

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.