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 903
SOUTHWESTERN BELL 130
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 96
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 89
NEW CINGULAR WIRELESS PCS, LLC - IL 70
LEVEL 3 COMMUNICATIONS, LLC - TX 64
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
— 903-587 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 LEONARD TX
— 903-588 0XXX8XXX which blocks → PEOPLES TEL. COOP. 2130 GLADEBRNCH TX
— 903-589 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 JACKSONVL TX
— 903-590 0XXX6XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-591 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-592 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-593 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-594 4XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-595 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-596 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-597 not yet reported which blocks → SOUTHWESTERN BELL 9533 TYLER TX
— 903-598 1XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 POINT TX
— 903-599 none assigned yet which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 STREETMAN TX
— 903-610 not yet reported which blocks → SOUTHWESTERN BELL 9533 LONGVIEW TX
— 903-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 903-612 not yet reported which blocks → CUMBY TELEPHONE COOPERATIVE, INC. 4042 BRASHEAR TX
— 903-614 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA TX
— 903-615 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KILGORE TX
— 903-618 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 OWENTOWN TX
— 903-620 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 DENISON TX
— 903-621 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 GREENVILLE TX
— 903-622 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 DEADWOOD TX
— 903-623 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 WINDOM TX
— 903-624 7XXX which blocks → METROPCS, INC. 5562 DENISON TX
— 903-625 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - TX 903C JACKSONVL TX
— 903-626 0XXX2XXX3XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JEWETT TX
— 903-627 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 VANALSTYNE TX
— 903-628 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 NEW BOSTON TX
— 903-629 none assigned yet which blocks → PEOPLES TEL. COOP. 2130 SANDYCREEK TX
— 903-631 0XXX2XXX3XXX5XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 CARTHAGE TX
— 903-632 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 BOGATA TX
— 903-633 not yet reported which blocks → EASTEX TEL. COOP., INC. 2068 ELYSINFLDS TX
— 903-634 7XXX which blocks → CUMBY TELEPHONE COOPERATIVE, INC. 4042 LONE OAK TX
— 903-635 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONGVIEW TX
— 903-636 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 BIG SANDY TX
— 903-637 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PITTSBURG TX
— 903-639 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 HUGHES SPG TX
— 903-640 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BONHAM TX
— 903-641 1XXX5XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 CORSICANA TX
— 903-642 1XXX2XXX4XXX6XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 OAKWOOD TX
— 903-643 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LONGVIEW TX
— 903-645 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 DAINGERFLD TX
— 903-646 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HENDERSON TX
— 903-647 3XXX5XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 DENISON TX
— 903-648 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 WEAVER TX
— 903-649 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HENDERSON TX
— 903-651 0XXX2XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 WHITESBORO TX
— 903-652 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 DEPORT TX
— 903-653 0XXX1XXX2XXX4XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 LONGVIEW TX
— 903-654 9XXX which blocks → SOUTHWESTERN BELL 9533 CORSICANA 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.