NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

6 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 346
ONVOY, LLC - TX 4
PAETEC ITEL, LLC 1
8X8, INC. 1
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
2020-11-04 346-496 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C BEACH CITY TX
2020-11-04 346-576 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C BARKER TX
2020-10-29 346-463 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C ALVIN TX
2020-10-28 346-449 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 CHANNELVW TX
2020-10-28 346-450 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SUGAR LAND TX
2020-10-28 346-466 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - TX 903C HIGHLANDS TX
2020-10-26 346-448 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 HOUSTON TX
2020-10-15 346-447 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 CLEVELAND TX
2020-10-14 346-445 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 CYPRESS TX
2020-10-07 346-442 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING TX
2020-10-07 346-443 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SPRING TX
2020-10-05 346-439 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-440 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-441 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2020-09-28 346-438 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J HOUSTON TX
2020-09-11 346-437 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HSTNSUBURB TX
2020-09-03 346-435 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LANGHAMCRK TX
2020-08-28 346-429 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAMMEL TX
2020-08-28 346-431 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAYTOWN TX
2020-08-28 346-434 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
2020-08-19 346-433 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HSTNSUBURB TX
2020-08-19 346-899 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H STAFFORD TX
2020-08-05 346-895 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J HOUSTON TX
2020-07-28 346-428 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 478J HOUSTON TX
2020-07-09 346-432 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H HSTNSUBURB TX
2020-07-09 346-477 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HUMBLE TX
2020-07-09 346-488 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H PORTER HTS TX
2020-07-09 346-577 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HOUSTON TX
2020-07-09 346-955 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H DICKINSON TX
2020-07-02 346-946 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CYPRESS TX
2020-06-22 346-677 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BAYTOWN TX
2020-06-22 346-786 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H SPRING TX
2020-06-18 346-667 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H KATY TX
2020-04-07 346-427 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 APOLLO TX
2020-03-26 346-424 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SATSUMA TX
2020-03-26 346-425 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LANGHAMCRK TX
2020-02-26 346-423 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PORTER TX
2020-02-11 346-421 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARCOLA TX
2020-02-11 346-422 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HSTNSUBURB TX
2020-01-28 346-419 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAMMEL TX
2020-01-15 346-418 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BAMMEL TX
2020-01-09 346-417 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHANNELVW TX
2020-01-08 346-416 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 TOMBALL TX
2019-12-24 346-409 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2019-12-23 346-408 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 DICKINSON TX
2019-12-23 346-415 0XXX1XXX2XXX3XXX4XXX5XXX6XXX which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F HSTNSUBURB TX
2019-10-31 346-426 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J HOUSTON TX
2019-10-28 346-407 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
2019-10-25 346-510 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H HOUSTON TX
2019-10-17 346-399 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAMMEL TX

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.