NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

6 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, 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
2019-10-09 346-710 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H BAYTOWN TX
2019-09-30 346-398 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 HOUSTON TX
2019-09-20 346-977 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H BAYTOWN TX
2019-09-18 346-396 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F HOUSTON TX
2019-09-11 346-395 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HOUSTON TX
2019-08-19 346-390 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 BARKER TX
2019-08-19 346-391 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SUGAR LAND TX
2019-08-19 346-392 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SATSUMA TX
2019-08-19 346-393 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 STAFFORD TX
2019-08-19 346-394 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 CHANNELVW TX
2019-08-08 346-397 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HOUSTON TX
2019-07-26 346-389 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BEACH CITY TX
2019-07-23 346-388 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F HOUSTON TX
2019-06-18 346-456 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C MANVEL TX
2019-06-18 346-567 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C MONTBLVIEU TX
2019-05-21 346-465 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LANGHAMCRK TX
2019-05-21 346-529 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HSTNSUBURB TX
2019-05-21 346-732 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CYPRESS TX
2019-05-21 346-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H RICHMNRNBG TX
2019-05-21 346-766 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HOUSTON TX
2019-05-21 346-842 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HUMBLE TX
2019-05-21 346-877 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H DEER PARK TX
2019-05-21 346-988 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CLEVELAND TX
2019-04-17 346-386 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SPRING TX
2019-03-27 346-385 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J FRIENDSWD TX
2019-03-21 346-384 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 APOLLO TX
2019-03-19 346-500 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J HOUSTON TX
2019-01-24 346-380 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 SPRING TX
2019-01-24 346-381 0–9 XXXall 10 · 4 holders which blocks → VOIP INNOVATIONS, LLC 597F HSTNSUBURB TX
2019-01-24 346-382 0–9 XXXall 10 · 6 holders which blocks → VOIP INNOVATIONS, LLC 597F SPRING TX
2019-01-23 346-379 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CYPRESS TX
2019-01-18 346-378 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HSTNSUBURB TX
2019-01-17 346-377 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANGHAMCRK TX
2019-01-08 346-376 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SATSUMA TX
2018-12-20 346-375 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SUGAR LAND TX
2018-12-17 346-374 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D HSTNSUBURB TX
2018-10-29 346-373 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F CHANNELVW TX
2018-10-18 346-369 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 BEACH CITY TX
2018-10-18 346-371 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 STAFFORD TX
2018-10-18 346-372 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 SPRING TX
2018-10-11 346-370 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 SPRING TX
2018-10-04 346-367 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TOMBALL TX
2018-10-03 346-366 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LANGHAMCRK TX
2018-09-21 346-365 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 BARKER TX
2018-09-14 346-364 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 CLEVELAND TX
2018-09-13 346-610 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C HOUSTON TX
2018-09-06 346-363 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SATSUMA TX
2018-08-30 346-358 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C LEAGUECITY TX
2018-08-30 346-359 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C LIVERPOOL TX
2018-08-30 346-361 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C SEABROOK TX

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.