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 325
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 61
SOUTHWESTERN BELL 39
NEW CINGULAR WIRELESS PCS, LLC - IL 35
ONVOY, LLC - TX 32
24
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
— 325-525 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELNYX LLC 073H PAINT ROCK TX
— 325-529 not yet reported which blocks → TAYLOR TEL. COOP., INC. 2151 POTOSI TX
— 325-530 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 SONORA TX
— 325-537 not yet reported which blocks → TAYLOR TEL. COOP., INC. 2151 HAWLEY TX
— 325-548 not yet reported which blocks → TAYLOR TEL. COOP., INC. 2151 HAMBY TX
— 325-554 8XXX which blocks → TAYLOR TEL. COOP., INC. 2151 TUSCOLA TX
— 325-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 325-572 not yet reported which blocks → TAYLOR TEL. COOP., INC. 2151 BUFFALOGAP TX
— 325-573 not yet reported which blocks → SOUTHWESTERN BELL 9533 SNYDER TX
— 325-574 0XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SNYDER TX
— 325-575 4XXX7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SNYDER TX
— 325-576 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 HAMLIN TX
— 325-583 not yet reported which blocks → TAYLOR TEL. COOP., INC. 2151 LAWN TX
— 325-597 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BRADY TX
— 325-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 325-617 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K SAN ANGELO TX
— 325-622 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 CHEROKEE TX
— 325-623 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 LOCKER TX
— 325-624 not yet reported which blocks → COLEMAN COUNTY TEL. COOP., INC. 2057 BURKETT TX
— 325-625 0XXX6XXX7XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 COLEMAN TX
— 325-627 3XXX4XXX5XXX6XXX8XXX which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-628 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 BEND TX
— 325-632 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 MERTZON TX
— 325-636 none assigned yet which blocks → COLEMAN COUNTY TEL. COOP., INC. 2057 VALERA TX
— 325-641 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BROWNWOOD TX
— 325-642 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROWNWOOD TX
— 325-643 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BROWNWOOD TX
— 325-644 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WESTBROOK TX
— 325-646 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BROWNWOOD TX
— 325-647 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROWNWOOD TX
— 325-648 0XXX1XXX5XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GOLDTHWAIT TX
— 325-649 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BROWNWOOD TX
— 325-650 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SAN ANGELO TX
— 325-651 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-653 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-654 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-655 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-656 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SAN ANGELO TX
— 325-657 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-658 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-659 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-660 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ABILENE TX
— 325-662 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 PUTNAM TX
— 325-665 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ABILENE TX
— 325-667 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GUSTINE TX
— 325-668 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ABILENE TX
— 325-669 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ABILENE TX
— 325-670 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-671 4XXX6XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-672 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE 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.