NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 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, last 30 days — NPA 810
NEW CINGULAR WIRELESS PCS, LLC - IL 2
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
2021-06-28 810-268 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
2021-06-28 810-281 0XXX2XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LEXINGTON MI
2021-06-25 810-256 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLCV - MI 543C METAMORA MI
2021-06-16 810-273 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C GOODRICH MI
2021-06-16 810-283 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C JEDDO MI
2021-06-16 810-284 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C LAPEER MI
2021-06-16 810-286 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C NORTH BRCH MI
2021-06-16 810-314 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C PORT HURON MI
2021-05-19 810-380 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H FLUSHING MI
2021-05-19 810-440 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C CLIMTMORRS MI
2021-04-02 810-799 1XXX2XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H GRANDBLANC MI
2021-02-19 810-345 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FLINT MI
2020-11-03 810-264 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C MEMPHIS MI
2020-10-23 810-261 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C RANKIN MI
2020-10-20 810-204 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C PORT HURON MI
2020-09-24 810-884 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 MARINECITY MI
2020-08-17 810-254 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E GRANDBLANC MI
2020-06-11 810-295 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BRIGHTON MI
2020-05-18 810-246 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
2019-12-09 810-243 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLINT MI
2019-07-29 810-363 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E PORT HURON MI
2019-05-17 810-331 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ALMONT MI
2019-04-19 810-271 0XXX2XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LENNON MI
2019-01-28 810-529 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
2018-09-25 810-818 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C MONTROSE MI
2018-01-04 810-819 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C BRIGHTON MI
2017-10-06 810-666 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2017-09-19 810-322 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
2017-06-02 810-428 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDBLANC MI
2017-05-03 810-379 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E DAVISON MI
2017-03-20 810-242 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORT HURON MI
2016-11-15 810-263 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BRIGHTON MI
2016-11-02 810-219 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLINT MI
2016-06-27 810-432 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E PORT HURON MI
2016-05-26 810-484 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
2016-03-16 810-215 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K FENTON MI
2016-03-14 810-337 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J FLINT MI
2016-02-25 810-206 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLCV - MI 543C BRIGHTON MI
2015-09-17 810-255 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E HADLEY MI
2015-08-13 810-777 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2015-07-23 810-498 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDBLANC MI
2015-04-16 810-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C GOODELLS MI
2014-09-30 810-775 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BRIGHTON MI
2014-09-26 810-289 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CLAIR MI
2014-08-28 810-445 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GRANDBLANC MI
2014-08-13 810-226 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E DAVISON MI
2014-05-30 810-202 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G FLUSHING MI
2014-05-30 810-321 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G JEDDO MI
2014-04-15 810-279 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J HARTLAND MI
2014-04-14 810-510 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G COLUMBIAVL 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.