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 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
— 409-386 3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SILSBEE TX
— 409-389 none assigned yet which blocks → TEXAS WINDSTREAM, LLC 2153 WALLISVL TX
— 409-392 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GALVESTON TX
— 409-397 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BON WIER TX
— 409-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 409-420 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 KIRBYVILLE TX
— 409-423 8XXX which blocks → SOUTHWESTERN BELL 9533 KIRBYVILLE TX
— 409-429 2XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPURGER TX
— 409-440 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HTCHCCKSNF TX
— 409-454 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 BEAUMONT TX
— 409-455 5XXX which blocks → METROPCS, INC. 5562 BEAUMONT TX
— 409-456 not yet reported which blocks → SPOK, INC. 6630 BEAUMONT TX
— 409-460 3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 PORTARTHUR TX
— 409-466 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 BEAUMONT TX
— 409-474 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 BRIDGECITY TX
— 409-489 4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 JASPER TX
— 409-497 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GALVESTON TX
— 409-502 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GALVESTON TX
— 409-504 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEAUMONT TX
— 409-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 409-515 3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GALVESTON TX
— 409-519 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NDLDPTNCHS TX
— 409-525 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PINELAND TX
— 409-526 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GALVESTON TX
— 409-547 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WARREN TX
— 409-550 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BEAUMONT TX
— 409-553 none assigned yet which blocks → METROPCS, INC. 5562 VIDOR TX
— 409-554 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BEAUMONT TX
— 409-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 409-565 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BURKEVILLE TX
— 409-571 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BUNA TX
— 409-572 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 GALVESTON TX
— 409-579 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 FAIRMOUNT TX
— 409-584 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 PINELAND TX
— 409-586 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BRONSON TX
— 409-599 2XXX which blocks → AERIAL COMMUNICATIONS, INC. 6701 GALVESTON TX
— 409-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 409-617 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BEAUMONT TX
— 409-621 2XXX4XXX which blocks → SOUTHWESTERN BELL 9533 GALVESTON TX
— 409-625 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MILAM TX
— 409-626 none assigned yet which blocks → SOUTHWESTERN BELL 9533 NDLDPTNCHS TX
— 409-641 not yet reported which blocks → SOUTHWESTERN BELL 9533 TXSCYMARQU TX
— 409-643 not yet reported which blocks → SOUTHWESTERN BELL 9533 TXSCYMARQU TX
— 409-645 not yet reported which blocks → SOUTHWESTERN BELL 9533 TXSCYMARQU TX
— 409-651 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BEAUMONT TX
— 409-654 none assigned yet which blocks → SOUTHWESTERN BELL 9533 BEAUMONT TX
— 409-655 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TXSCYMARQU TX
— 409-656 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BEAUMONT TX
— 409-658 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BEAUMONT TX
— 409-659 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 BEAUMONT 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.