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 409
SOUTHWESTERN BELL 142
NEW CINGULAR WIRELESS PCS, LLC - IL 50
ONVOY, LLC - TX 37
AERIAL COMMUNICATIONS, INC. 28
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 26
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
2001-02-08 409-671 not yet reported which blocks → SPOK, INC. 6630 TXSCYMARQU TX
— 409-206 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C MAURICEVL TX
— 409-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 409-217 0–9 XXXall 10 · 8 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K PORTARTHUR TX
— 409-220 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GALVESTON TX
— 409-225 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 BEAUMONT TX
— 409-233 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 MAURICEVL TX
— 409-234 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BEAUMONT TX
— 409-241 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BEAUMONT TX
— 409-242 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BEAUMONT TX
— 409-243 not yet reported which blocks → TEXAS WINDSTREAM, LLC 2153 HAMSHIRE TX
— 409-246 0XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 KOUNTZE TX
— 409-251 not yet reported which blocks → CEBRIDGE TELECOM TX , L.P. - TX 318C HIGHISLAND TX
— 409-252 2XXX which blocks → TEXAS WINDSTREAM, LLC 2153 DOUBLEBYOU TX
— 409-253 not yet reported which blocks → CAMERON TEL CO 0425 NOME TX
— 409-255 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GALVESTON TX
— 409-256 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 GALVESTON TX
— 409-260 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C KOUNTZE TX
— 409-267 9XXX which blocks → TEXAS WINDSTREAM, LLC 2153 ANAHUAC TX
— 409-276 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 EVADALE TX
— 409-279 0XXX1XXX2XXX7XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K KIRBYVILLE TX
— 409-280 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J PORTARTHUR TX
— 409-283 9XXX which blocks → SOUTHWESTERN BELL 9533 WOODVILLE TX
— 409-284 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 BEAUMONT TX
— 409-286 not yet reported which blocks → CAMERON TEL CO 0425 HIGHISLAND TX
— 409-287 0XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SOUR LAKE TX
— 409-296 1XXX which blocks → TEXAS WINDSTREAM, LLC 2153 WINNIE TX
— 409-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 409-313 5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRIDGECITY TX
— 409-316 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HTCHCCKSNF TX
— 409-331 2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WOODVILLE TX
— 409-338 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 BEAUMONT TX
— 409-347 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BEAUMONT TX
— 409-350 3XXX4XXX6XXX · 2 holders which blocks → METROPCS, INC. 5562 BEAUMONT TX
— 409-351 3XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 BEAUMONT TX
— 409-353 not yet reported which blocks → SPOK, INC. 6630 BEAUMONT TX
— 409-354 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 GALVESTON TX
— 409-355 5XXX which blocks → TEXAS WINDSTREAM, LLC 2153 SMITHPOINT TX
— 409-356 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 GALVESTON TX
— 409-359 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 TXSCYMARQU TX
— 409-363 5XXX6XXX7XXX8XXX · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BEAUMONT TX
— 409-370 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GALVESTON TX
— 409-373 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SILSBEE TX
— 409-374 none assigned yet which blocks → TEXAS WINDSTREAM, LLC 2153 HANKAMER TX
— 409-379 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 NEWTON TX
— 409-381 not yet reported which blocks → SOUTHWESTERN BELL 9533 JASPER TX
— 409-382 none assigned yet which blocks → SOUTHWESTERN BELL 9533 JASPER TX
— 409-383 3XXX4XXX7XXX8XXX which blocks → SOUTHWESTERN BELL 9533 JASPER TX
— 409-384 not yet reported which blocks → SOUTHWESTERN BELL 9533 JASPER TX
— 409-385 9XXX which blocks → SOUTHWESTERN BELL 9533 SILSBEE 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.