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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 325-812 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-817 not yet reported which blocks → TX
— 325-823 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ANSON TX
— 325-830 not yet reported which blocks → TX
— 325-832 not yet reported which blocks → TX
— 325-835 0XXX1XXX5XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 MERTZON TX
— 325-844 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 HAMLIN TX
— 325-846 not yet reported which blocks → TAYLOR TEL. COOP., INC. 2151 NUBIA TX
— 325-853 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 ELDORADO TX
— 325-854 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BAIRD TX
— 325-862 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 TRENT TX
— 325-863 0XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HERMLEIGH TX
— 325-869 2XXX4XXX6XXX7XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 EDEN TX
— 325-876 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BARNHART TX
— 325-884 0XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BIG LAKE TX
— 325-885 not yet reported which blocks → TOTELCOM COMMUNICATIONS, LLC 2060 NEWBURG TX
— 325-888 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 ABILENE TX
— 325-893 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 CLYDE TX
— 325-896 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 CHRISTOVAL TX
— 325-903 not yet reported which blocks → TX
— 325-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 325-915 not yet reported which blocks → TX
— 325-928 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MERKEL TX
— 325-931 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 SNYDER TX
— 325-938 none assigned yet which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 BIG VALLEY TX
— 325-942 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-944 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-945 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MORAN TX
— 325-947 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-948 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 STAR TX
— 325-949 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-950 not yet reported which blocks → TX
— 325-958 not yet reported which blocks → TX
— 325-959 not yet reported which blocks → TX
— 325-962 not yet reported which blocks → ALENCO COMMUNICATIONS, INC. 2090 MCCAULLEY TX
— 325-966 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 PRIDDY TX
— 325-972 not yet reported which blocks → TX
— 325-976 not yet reported which blocks → TX
— 325-979 not yet reported which blocks → TX
— 325-985 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 MULLIN TX
— 325-988 not yet reported which blocks → TX
— 325-993 not yet reported which blocks → ALENCO COMMUNICATIONS, INC. 2090 SYLVESTER 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.