NumberResearch Membership · Data 09/24/2026

Recent prefix assignments

349 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
— 903-507 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-508 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TYLER TX
— 903-509 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-510 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 903-520 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TYLER TX
— 903-521 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TYLER TX
— 903-522 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KILGORE TX
— 903-523 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GORDONVL TX
— 903-524 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 WINFIELD TX
— 903-525 6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-526 9XXX which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-527 6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 CADDOMILLS TX
— 903-528 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 TYLER TX
— 903-529 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 MARQUEZ TX
— 903-530 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TYLER TX
— 903-531 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-532 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HOWE TX
— 903-533 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-534 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-535 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-536 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 CENTERVL TX
— 903-537 0XXX1XXX5XXX6XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 MT VERNON TX
— 903-538 6XXX which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 TUCKER TX
— 903-539 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 TYLER TX
— 903-540 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 903-541 1XXX3XXX6XXX7XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 JACKSONVL TX
— 903-542 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 903-543 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 SIMMS TX
— 903-544 6XXX7XXX which blocks → AT&T - LOCAL 7421 LONGVIEW TX
— 903-545 5XXX7XXX · 2 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 OAKWOOD TX
— 903-546 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 TOM BEAN TX
— 903-547 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 HOOKS TX
— 903-548 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DENISON TX
— 903-549 not yet reported which blocks → BRIGHTSPEED OF EASTERN TEXAS, INC. 2084 MONTALBA TX
— 903-551 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GUNTER TX
— 903-552 3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BLOOMNGGRV TX
— 903-553 2XXX which blocks → SOUTHWESTERN BELL 9533 LONGVIEW TX
— 903-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 903-556 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 TEXARKANA TX
— 903-557 2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
— 903-559 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 TEXARKANA TX
— 903-560 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 WILLSPOINT TX
— 903-561 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-562 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 AVINGER TX
— 903-563 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 MTPLEASANT TX
— 903-564 0XXX1XXX2XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 WHITESBORO TX
— 903-565 9XXX which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-566 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-567 8XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 CANTON TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.