NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 216
TELEPORT COMMUNICATIONS AMERICA, LLC - OH 1
ONVOY, LLC - OH 1
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
— 216-451 6XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-453 6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLEVELAND OH
— 216-454 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 TERRACE OH
— 216-455 4XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 TERRACE OH
— 216-456 0XXX1XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLEVELAND OH
— 216-458 8XXX which blocks → PAETEC ITEL, LLC 829J CLEVELAND OH
— 216-459 5XXX7XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-462 6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 216-464 not yet reported which blocks → OHIO BELL TEL CO 9321 TERRACE OH
— 216-468 2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K TERRACE OH
— 216-469 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-470 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-471 0XXX1XXX5XXX7XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-472 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 216-475 not yet reported which blocks → OHIO BELL TEL CO 9321 MONTRSE OH
— 216-476 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-477 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MONTRSE OH
— 216-478 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FIRST COMMUNICATIONS, LLC 460K MONTRSE OH
— 216-479 9XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-481 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-485 2XXX3XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-486 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-487 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 INDEPNDNCE OH
— 216-488 1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 TERRACE OH
— 216-491 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-496 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEVELAND OH
— 216-501 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 216-502 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLEVELAND OH
— 216-503 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 INDEPNDNCE OH
— 216-504 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 TERRACE OH
— 216-506 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CLEVELAND OH
— 216-509 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-510 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 MONTRSE OH
— 216-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 216-513 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-514 not yet reported which blocks → OHIO BELL TEL CO 9321 TERRACE OH
— 216-515 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-517 not yet reported which blocks → SPOK, INC. 6630 CLEVELAND OH
— 216-518 not yet reported which blocks → OHIO BELL TEL CO 9321 MONTRSE OH
— 216-520 not yet reported which blocks → OHIO BELL TEL CO 9321 INDEPNDNCE OH
— 216-521 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-522 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-523 4XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-524 not yet reported which blocks → OHIO BELL TEL CO 9321 INDEPNDNCE OH
— 216-527 3XXX4XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-529 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-531 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-532 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TELNYX LLC 073H INDEPNDNCE OH
— 216-533 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEVELAND OH
— 216-535 8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 CLEVELAND 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.