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
2025-12-16 248-261 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2024-12-30 248-300 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROYAL OAK MI
2023-12-15 248-947 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2023-10-12 248-749 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
2023-09-25 248-734 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2023-08-17 248-201 0–9 XXXall 10 · 4 holders which blocks → WIRETAP TELECOM, LLC. 733J SOUTHFIELD MI
2023-08-03 248-984 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2023-07-26 248-490 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2023-07-26 248-810 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C ROYAL OAK MI
2023-06-13 248-517 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2023-05-17 248-248 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H NORTHVILLE MI
2022-05-24 248-510 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
2021-09-21 248-315 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TROY MI
2021-04-22 248-389 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTHFIELD MI
2019-06-27 248-873 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2019-06-20 248-870 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NORTHVILLE MI
2016-12-23 248-970 0–9 XXXall 10 · 6 holders which blocks → CLEAR RATE COMMUNICATIONS, LLC 046L W BLOOMFLD MI
2016-11-30 248-900 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C ORTONVILLE MI
2016-11-23 248-832 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NORTHVILLE MI
2016-11-09 248-472 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MILFDWH LK MI
2016-11-03 248-954 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2016-10-25 248-940 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2016-08-18 248-861 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
2016-08-17 248-993 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 NORTHVILLE MI
2016-08-15 248-466 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D PONTIAC MI
2016-07-25 248-963 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ROCHESTER MI
2016-06-30 248-934 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
2016-06-30 248-983 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C HOLLY MI
2016-06-28 248-907 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E FARMINGTON MI
2016-04-20 248-500 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MILFDWH LK MI
2015-11-06 248-590 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BIRMINGHAM MI
2015-09-04 248-951 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C ROYAL OAK MI
2015-09-02 248-949 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2015-08-26 248-653 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 HOLLY MI
2015-08-20 248-965 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROYAL OAK MI
2015-08-17 248-600 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C PONTIAC MI
2015-08-17 248-621 0–9 XXXall 10 · 5 holders which blocks → 123.NET, LLC 2550 SOUTHFIELD MI
2015-07-21 248-897 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E PONTIAC MI
2015-06-17 248-781 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J TROY MI
2015-06-17 248-938 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
2015-06-16 248-843 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
2015-05-14 248-847 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 W BLOOMFLD MI
2015-05-13 248-768 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 W BLOOMFLD MI
2015-04-13 248-617 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTH LYON MI
2015-04-01 248-800 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C OXFORD MI
2015-03-27 248-839 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BIRMINGHAM MI
2015-03-18 248-775 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MILFDWH LK MI
2015-02-25 248-710 0–9 XXXall 10 · 6 holders which blocks → GRID 4 COMMUNICATIONS, INC. - MI 9714 ROCHESTER MI
2014-11-10 248-791 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
2014-10-09 248-704 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE 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.