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 248
MICHIGAN BELL TEL CO 251
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 72
NEW CINGULAR WIRELESS PCS, LLC - IL 66
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 62
LEVEL 3 COMMUNICATIONS, LLC - MI 58
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
— 248-598 5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 AUBURN HTS MI
— 248-601 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-603 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-604 not yet reported which blocks → SPOK, INC. 6630 SOUTHFIELD MI
— 248-608 4XXX which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-609 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER MI
— 248-610 not yet reported which blocks → SPOK, INC. 6630 PONTIAC MI
— 248-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 248-612 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 HOLLY MI
— 248-613 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-614 1XXX which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-615 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-616 4XXX which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-618 2XXX3XXX5XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 DRAYTON PL MI
— 248-619 4XXX5XXX6XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-620 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CLARKSTON MI
— 248-622 2XXX4XXX5XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-623 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 DRAYTON PL MI
— 248-624 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WALLEDLAKE MI
— 248-625 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CLARKSTON MI
— 248-626 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-627 0XXX which blocks → FRONTIER NORTH, INC. - MI 0695 ORTONVILLE MI
— 248-628 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 OXFORD MI
— 248-629 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROYAL OAK MI
— 248-630 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-631 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BIRMINGHAM MI
— 248-632 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 ROYAL OAK MI
— 248-633 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → 123.NET, LLC 2550 BIRMINGHAM MI
— 248-634 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 HOLLY MI
— 248-635 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TROY MI
— 248-636 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
— 248-637 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-640 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-641 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-642 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-643 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-644 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-645 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-646 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-647 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-648 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PONTIAC MI
— 248-649 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-650 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-651 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-652 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-654 5XXX6XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROYAL OAK MI
— 248-655 6XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-656 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-658 8XXX which blocks → PAETEC ITEL, LLC 829J ROYAL OAK MI
— 248-659 2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROCHESTER MI

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.