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
— 513-899 1XXX6XXX7XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MORROW OH
— 513-910 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 513-914 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H CINCINNATI OH
— 513-915 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MIDDLETOWN OH
— 513-917 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-919 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-920 not yet reported which blocks → SPOK, INC. 6630 CINCINNATI OH
— 513-921 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-922 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-923 0XXX6XXX7XXX8XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-924 3XXX4XXX6XXX7XXX · 2 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-925 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-928 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
— 513-929 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-931 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-932 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 LEBANON OH
— 513-933 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 LEBANON OH
— 513-934 7XXX which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 LEBANON OH
— 513-936 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-939 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CINCINNATI BELL 9348 HAMILTON OH
— 513-941 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-942 not yet reported which blocks → CINCINNATI BELL 9348 HAMILTON OH
— 513-943 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-944 not yet reported which blocks → SPOK, INC. 6630 CINCINNATI OH
— 513-945 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-946 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-947 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-948 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-950 not yet reported which blocks → OH
— 513-951 0–9 XXXall 10 · 4 holders which blocks → BARR TELL USA 907J HARRISON OH
— 513-954 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CINCINNATI OH
— 513-956 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-958 not yet reported which blocks → OH
— 513-959 not yet reported which blocks → OH
— 513-961 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-965 1XXX which blocks → CINCINNATI BELL 9348 LTL MIAMI OH
— 513-966 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H LTL MIAMI OH
— 513-967 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-969 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-971 not yet reported which blocks → SPOK, INC. 6630 CINCINNATI OH
— 513-976 not yet reported which blocks → OH
— 513-977 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-979 4XXX7XXX8XXX9XXX · 2 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-981 1XXX8XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-983 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-984 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-985 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-988 3XXX4XXX7XXX8XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 TRENTON 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.