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
— 216-536 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-538 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-539 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLEVELAND OH
— 216-541 0XXX1XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-544 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEVELAND OH
— 216-545 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 TERRACE OH
— 216-548 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEVELAND OH
— 216-549 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CLEVELAND OH
— 216-551 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-552 not yet reported which blocks → SPOK, INC. 6630 CLEVELAND OH
— 216-554 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OH
— 216-556 1XXX2XXX3XXX4XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-557 not yet reported which blocks → SPOK, INC. 6630 CLEVELAND OH
— 216-559 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-561 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-562 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLEVELAND OH
— 216-563 1XXX2XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-566 4XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-567 not yet reported which blocks → OH
— 216-568 not yet reported which blocks → SPOK, INC. 6630 CLEVELAND OH
— 216-570 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-573 not yet reported which blocks → OHIO BELL TEL CO 9321 INDEPNDNCE OH
— 216-574 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-575 4XXX8XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-577 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEVELAND OH
— 216-578 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-579 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-581 not yet reported which blocks → OHIO BELL TEL CO 9321 MONTRSE OH
— 216-583 6XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-586 2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-587 not yet reported which blocks → OHIO BELL TEL CO 9321 MONTRSE OH
— 216-588 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 216-589 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-590 not yet reported which blocks → SPOK, INC. 6630 TERRACE OH
— 216-591 not yet reported which blocks → OHIO BELL TEL CO 9321 TERRACE OH
— 216-592 8XXX9XXX which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-595 not yet reported which blocks → OHIO BELL TEL CO 9321 TERRACE OH
— 216-596 not yet reported which blocks → SPOK, INC. 6630 CLEVELAND OH
— 216-597 not yet reported which blocks → SPOK, INC. 6630 CLEVELAND OH
— 216-598 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-601 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CLEVELAND OH
— 216-606 5XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 INDEPNDNCE OH
— 216-609 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CLEVELAND OH
— 216-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 216-614 not yet reported which blocks → OH
— 216-615 not yet reported which blocks → OHIO BELL TEL CO 9321 CLEVELAND OH
— 216-617 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 INDEPNDNCE OH
— 216-618 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 216-619 6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 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.