NumberResearch Membership · Data 10/01/2026

Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 513-542 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-543 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
— 513-544 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-545 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-546 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
— 513-550 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-551 0XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-552 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-553 not yet reported which blocks → CINCINNATI BELL 9348 CLERMONT OH
— 513-554 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OH
— 513-556 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-557 0XXX1XXX6XXX8XXX9XXX · 3 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-558 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-559 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-560 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CINCINNATI OH
— 513-561 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-562 0XXX which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-563 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-564 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-565 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-566 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-569 2XXX3XXX · 2 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
— 513-571 0XXX which blocks → T-MOBILE USA, INC. 6529 MIDDLETOWN OH
— 513-573 not yet reported which blocks → BRIGHTSPEED OF NORTHWEST OHIO, INC. 0661 MASON OH
— 513-574 not yet reported which blocks → CINCINNATI BELL 9348 CINCINNATI OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.