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
— 513-470 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-471 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-473 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-474 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-475 3XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-476 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-477 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-478 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-479 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-480 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B SO LEBANON OH
— 513-481 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-482 0XXX1XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-483 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-484 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-487 0XXX8XXX9XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-489 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-490 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-492 0XXX1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 MASON OH
— 513-493 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H CINCINNATI OH
— 513-494 3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SO LEBANON OH
— 513-497 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-498 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-502 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-503 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-504 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-505 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-508 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-509 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 513-515 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-518 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-519 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-520 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-521 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-522 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-523 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 OXFORD OH
— 513-524 not yet reported which blocks → FRONTIER NORTH, INC. - OH 0615 OXFORD OH
— 513-526 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-527 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-528 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-529 not yet reported which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B OXFORD OH
— 513-530 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-531 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-532 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-533 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-535 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-536 1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CINCINNATI BELL 9348 WILLIAMSBG OH
— 513-537 0–9 XXXall 10 · 2 holders which blocks → WADDELL SOLUTIONS GROUP LLC 742J CINCINNATI OH
— 513-539 not yet reported which blocks → OHIO BELL TEL CO 9321 MONROE OH
— 513-541 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.