NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2014-10-03 248-607 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
2014-09-23 248-516 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C FARMINGTON MI
2014-09-10 248-571 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROYAL OAK MI
2014-09-10 248-986 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MI
2014-09-04 248-657 0–9 XXXall 10 · 5 holders which blocks → GRID 4 COMMUNICATIONS, INC. - MI 9714 CLARKSTON MI
2014-06-27 248-480 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BIRMINGHAM MI
2014-06-17 248-550 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2014-05-09 248-717 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E MILFDWH LK MI
2014-04-09 248-532 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ORTONVILLE MI
2014-03-05 248-518 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CLARKSTON MI
2014-02-12 248-206 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROYAL OAK MI
2013-12-18 248-385 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRMINGHAM MI
2013-11-08 248-301 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J COMMERCE MI
2013-10-07 248-294 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PONTIAC MI
2013-10-07 248-309 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
2013-09-09 248-378 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NORTHVILLE MI
2013-07-30 248-221 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PONTIAC MI
2013-04-21 248-308 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
2013-04-05 248-268 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J ROYAL OAK MI
2013-02-01 248-216 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MILFDWH LK MI
2013-02-01 248-222 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MILFDWH LK MI
2013-02-01 248-297 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2013-02-01 248-492 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
2013-02-01 248-638 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MILFDWH LK MI
2013-02-01 248-718 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ORTONVILLE MI
2013-02-01 248-831 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ORTONVILLE MI
2013-01-31 248-923 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ROCHESTER MI
2013-01-11 248-296 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
2012-06-27 248-234 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SOUTHFIELD MI
2011-09-28 248-826 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
2011-08-12 248-817 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J TROY MI
2011-08-08 248-639 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PONTIAC MI
2011-08-08 248-878 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TROY MI
2011-08-05 248-558 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
2011-07-15 248-513 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
2011-06-08 248-392 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 PONTIAC MI
2011-05-16 248-602 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 TROY MI
2011-05-13 248-278 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 SOUTH LYON MI
2011-03-18 248-803 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ORTONVILLE MI
2011-01-26 248-285 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
2010-05-21 248-266 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ROCHESTER MI
2010-05-14 248-825 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TROY MI
2010-04-02 248-795 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
2010-02-16 248-716 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E COMMERCE MI
2009-11-05 248-759 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROCHESTER MI
2009-07-31 248-403 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 CLARKSTON MI
2009-04-29 248-525 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TROY MI
2008-10-08 248-906 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 TROY MI
2008-10-02 248-812 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 PONTIAC MI
2008-08-06 248-325 0–9 XXXall 10 · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.