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 903
SOUTHWESTERN BELL 130
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 96
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 89
NEW CINGULAR WIRELESS PCS, LLC - IL 70
LEVEL 3 COMMUNICATIONS, LLC - TX 64
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
— 903-655 4XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HENDERSON TX
— 903-656 5XXX which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 LONE STAR TX
— 903-657 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HENDERSON TX
— 903-658 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HENDERSON TX
— 903-660 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HALLSVILLE TX
— 903-661 not yet reported which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 PALESTINE TX
— 903-662 1XXX2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 LONE OAK TX
— 903-663 not yet reported which blocks → SOUTHWESTERN BELL 9533 LONGVIEW TX
— 903-664 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 TELEPHONE TX
— 903-665 0XXX which blocks → SOUTHWESTERN BELL 9533 JEFFERSON TX
— 903-666 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JEFFERSON TX
— 903-667 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 DEKALB TX
— 903-668 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HALLSVILLE TX
— 903-670 not yet reported which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 ATHENS TX
— 903-671 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 REDWATER TX
— 903-672 7XXX which blocks → BRIGHTSPEED OF LOUISIANA, LLC 0434 VIVIAN TX
— 903-673 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 PURDON TX
— 903-674 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 DETROIT TX
— 903-675 not yet reported which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 ATHENS TX
— 903-676 8XXX which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 ATHENS TX
— 903-677 not yet reported which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 ATHENS TX
— 903-678 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 BECKVILLE TX
— 903-679 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 KARNACK TX
— 903-681 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ATHENS TX
— 903-682 6XXX which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 FROST TX
— 903-683 0XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 RUSK TX
— 903-684 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 AVERY TX
— 903-685 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 GARY TX
— 903-686 1XXX2XXX3XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LONGVIEW TX
— 903-687 not yet reported which blocks → EASTEX TEL. COOP., INC. 2068 WASKOM TX
— 903-690 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CARTHAGE TX
— 903-691 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TEXARKANA TX
— 903-692 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARTHAGE TX
— 903-693 not yet reported which blocks → SOUTHWESTERN BELL 9533 CARTHAGE TX
— 903-694 not yet reported which blocks → SOUTHWESTERN BELL 9533 CARTHAGE TX
— 903-695 5XXX6XXX · 2 holders which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 BLOOMNGGRV TX
— 903-696 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GUNTER TX
— 903-697 none assigned yet which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 ANNONA TX
— 903-698 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAGWELL TX
— 903-700 not yet reported which blocks → TX
— 903-707 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K TYLER TX
— 903-710 1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K BULLARD TX
— 903-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 903-712 2XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 VANALSTYNE TX
— 903-713 not yet reported which blocks → ONE RING NETWORKS II, INC. D/B/A ONE RING NETWORKS 3726 MABANK TX
— 903-714 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 TYLER TX
— 903-717 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 MTPLEASANT TX
— 903-719 not yet reported which blocks → HELMSCO, INC. 6833 CORSICANA TX
— 903-720 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LONGVIEW TX
— 903-721 6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 JACKSONVL 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.