NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 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, last 30 days
8X8, INC. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 254-510 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 254-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 254-518 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 COPPERASCV TX
— 254-519 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-520 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-522 3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BRECKENRDG TX
— 254-526 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-527 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BARTLETT TX
— 254-532 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-533 6XXX which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 MALONE TX
— 254-534 6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 TEMPLE TX
— 254-535 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
— 254-537 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 WACO TX
— 254-539 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-541 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TEMPLE TX
— 254-542 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 COPPERASCV TX
— 254-546 0XXX1XXX2XXX3XXX6XXX7XXX9XXX · 3 holders which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 CHILTON TX
— 254-547 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 COPPERASCV TX
— 254-548 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 WACO TX
— 254-549 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BRECKENRDG TX
— 254-554 none assigned yet which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST TX
— 254-559 none assigned yet which blocks → SOUTHWESTERN BELL 9533 BRECKENRDG TX
— 254-562 not yet reported which blocks → SOUTHWESTERN BELL 9533 MEXIA TX
— 254-564 0XXX6XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WALNUT SPG TX
— 254-572 1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 STRAWN TX
— 254-576 6XXX which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 HUBBARD TX
— 254-578 6XXX which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 DAWSON TX
— 254-580 none assigned yet which blocks → SOUTHWESTERN BELL 9533 HILLSBORO TX
— 254-582 not yet reported which blocks → SOUTHWESTERN BELL 9533 HILLSBORO TX
— 254-583 not yet reported which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 ROSEBUD TX
— 254-584 6XXX which blocks → VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 1181 LOTT TX
— 254-587 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 REAGAN TX
— 254-592 0XXX which blocks → T-MOBILE USA, INC. 6529 STEPHENVL TX
— 254-593 7XXX which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 BUCKHOLTS TX
— 254-597 5XXX which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 CRANFILSGP TX
— 254-598 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 TEMPLE TX
— 254-602 4XXX5XXX which blocks → SOUTHWESTERN BELL 9533 HILLSBORO TX
— 254-605 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CAMERON TX
— 254-609 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 254-610 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 254-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 254-613 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BELTON TX
— 254-616 0XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-618 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN TX
— 254-622 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 LAGUNA PK TX
— 254-623 0XXX which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 BYNUM TX
— 254-624 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 TEMPLE TX
— 254-625 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEXIA TX
— 254-628 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 KILLEEN 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.