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
2019-07-01 325-266 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ABILENE TX
2019-04-01 325-273 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J SWEETWATER TX
2019-03-27 325-253 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CSC WIRELESS, LLC 425J SAN ANGELO TX
2018-10-29 325-252 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C PUTNAM TX
2018-06-13 325-249 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D SAN ANGELO TX
2018-06-06 325-244 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D ABILENE TX
2018-05-30 325-326 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C ANSON TX
2018-05-30 325-335 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C HAMLIN TX
2018-05-30 325-399 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 2 holders which blocks → ONVOY, LLC - TX 903C STAMFORD TX
2018-05-30 325-425 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C ROBY TX
2018-03-15 325-999 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C ABILENE TX
2018-01-26 325-238 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C ABILENE TX
2018-01-19 325-237 0–9 XXXall 10 · 2 holders which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 BLACKWELL TX
2017-11-13 325-230 0–9 XXXall 10 · 5 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MERKEL TX
2017-08-01 325-225 0–9 XXXall 10 · 6 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 CLYDE TX
2017-04-27 325-413 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C SONORA TX
2017-03-14 325-241 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C BLACKWELL TX
2017-03-14 325-246 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C MORAN TX
2017-02-28 325-777 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SAN ANGELO TX
2016-12-14 325-309 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ALBANY TX
2016-11-28 325-308 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7249 OZONA TX
2016-11-16 325-661 not yet reported which blocks → AMA COMM., LLC DBA AMA*TECHTEL COMMUNICATIONS-TX 0132 PUTNAM TX
2016-11-16 325-946 not yet reported which blocks → AMA COMM., LLC DBA AMA*TECHTEL COMMUNICATIONS-TX 0132 MORAN TX
2016-07-27 325-757 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 TRENT TX
2016-07-26 325-312 0–9 XXXall 10 · 3 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 LORAINE TX
2016-07-26 325-313 0–9 XXXall 10 · 4 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BAIRD TX
2016-07-05 325-221 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BRONTE TX
2016-05-25 325-304 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SAN ANGELO TX
2015-12-22 325-302 4XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BAIRD TX
2015-04-06 325-305 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J ABILENE TX
2015-02-09 325-240 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRADY TX
2013-11-15 325-704 0–9 XXXall 10 · 2 holders which blocks → CSC VOICE, LLC 612K ABILENE TX
2013-11-01 325-703 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K SAN ANGELO TX
2013-03-04 325-301 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 551G SAN ANGELO TX
2012-11-14 325-219 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C SWEETWATER TX
2011-09-23 325-229 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C WESTBROOK TX
2011-02-16 325-500 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → YMAX COMMUNICATIONS CORP. - TX 327E SAN ANGELO TX
2010-11-15 325-400 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C ABILENE TX
2010-09-22 325-307 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 ABILENE TX
2010-05-10 325-264 not yet reported which blocks → AMA COMM., LLC DBA AMA*TECHTEL COMMUNICATIONS-TX 0132 BLACKWELL TX
2010-01-26 325-256 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SWEETWATER TX
2009-09-10 325-272 0XXX1XXX2XXX3XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 MERKEL TX
2009-09-09 325-269 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CLYDE TX
2009-06-10 325-276 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SAN ANGELO TX
2009-05-28 325-300 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SAN ANGELO TX
2009-04-16 325-333 9XXX which blocks → T-MOBILE USA, INC. 6529 ABILENE TX
2009-04-15 325-294 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → HILL COUNTRY TELECOMMUNICATIONS, LLC - TX 413F MASON TX
2008-11-21 325-268 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ABILENE TX
2008-11-12 325-262 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SAN ANGELO TX
2008-10-24 325-263 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SAN ANGELO 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.