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 330
OHIO BELL TEL CO 198
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 116
NEW CINGULAR WIRELESS PCS, LLC - IL 64
T-MOBILE USA, INC. 62
BRIGHTSPEED OF NORTHWEST OHIO, INC. 60
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 330-536 0XXX1XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → OHIO BELL TEL CO 9321 LOWELLVL OH
— 330-537 1XXX6XXX8XXX9XXX which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 DAMASCUS OH
— 330-538 4XXX7XXX8XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 NO JACKSON OH
— 330-539 2XXX3XXX8XXX · 2 holders which blocks → OHIO BELL TEL CO 9321 GIRARD OH
— 330-540 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 YOUNGSTOWN OH
— 330-542 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → OHIO BELL TEL CO 9321 NORTH LIMA OH
— 330-543 not yet reported which blocks → OHIO BELL TEL CO 9321 AKRON OH
— 330-544 not yet reported which blocks → OHIO BELL TEL CO 9321 NILES OH
— 330-545 not yet reported which blocks → OHIO BELL TEL CO 9321 GIRARD OH
— 330-547 1XXX which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 BERLIN CTR OH
— 330-548 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J KENT OH
— 330-549 1XXX6XXX7XXX8XXX · 4 holders which blocks → OHIO BELL TEL CO 9321 NORTH LIMA OH
— 330-550 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 YOUNGSTOWN OH
— 330-551 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - OH 464C HARTVILLE OH
— 330-552 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 KENT OH
— 330-553 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WARREN OH
— 330-554 0XXX which blocks → T-MOBILE USA, INC. 6529 KENT OH
— 330-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OH
— 330-559 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH
— 330-560 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 AKRON OH
— 330-561 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 AKRON OH
— 330-562 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 AURORA OH
— 330-563 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J GREENSBURG OH
— 330-564 3XXX5XXX6XXX7XXX which blocks → PAETEC ITEL, LLC 829J AKRON OH
— 330-565 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 YOUNGSTOWN OH
— 330-566 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CANTON OH
— 330-567 4XXX which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 SHREVE OH
— 330-568 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → OHIO BELL TEL CO 9321 HUBBARD OH
— 330-569 4XXX8XXX which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 HIRAM OH
— 330-570 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 KENT OH
— 330-571 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 AKRON OH
— 330-572 9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 AKRON OH
— 330-573 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 AKRON OH
— 330-575 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CANTON OH
— 330-576 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MONTROSE OH
— 330-577 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J RAVENNA OH
— 330-578 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J ROOTSTOWN OH
— 330-579 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MASSILLON OH
— 330-580 not yet reported which blocks → OHIO BELL TEL CO 9321 CANTON OH
— 330-581 0XXX2XXX4XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ALLIANCE OH
— 330-583 1XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 GREENE OH
— 330-584 8XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 NO BENTON OH
— 330-585 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ALLIANCE OH
— 330-587 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J HARTVILLE OH
— 330-588 6XXX which blocks → OHIO BELL TEL CO 9321 CANTON OH
— 330-589 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 NILES OH
— 330-590 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 SHARON CTR OH
— 330-592 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 AKRON OH
— 330-593 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 KENT OH
— 330-594 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J MOGADORE 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.