NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
— 281-271 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DEER PARK TX
— 281-272 3XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-273 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-274 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-275 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-276 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-277 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-278 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-279 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-280 not yet reported which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-282 7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-283 not yet reported which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-284 not yet reported which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-285 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-286 not yet reported which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-287 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-288 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-289 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-290 4XXX which blocks → SOUTHWESTERN BELL 9533 TOMBALL TX
— 281-291 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEABROOK TX
— 281-292 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-293 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-294 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-295 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-296 3XXX which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-297 8XXX which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-298 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-299 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ALVIN TX
— 281-300 none assigned yet which blocks → METROPCS, INC. 5562 HOUSTON TX
— 281-301 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 BAMMEL TX
— 281-302 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 SUGAR LAND TX
— 281-303 1XXX3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BEACH CITY TX
— 281-304 2XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CYPRESS TX
— 281-307 0XXX5XXX6XXX · 2 holders which blocks → ONVOY, LLC - TX 903C LA PORTE TX
— 281-308 not yet reported which blocks → TELETOUCH COMMUNICATIONS, INC. 6591 BAMMEL TX
— 281-309 1XXX2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 DICKINSON TX
— 281-310 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → AT&T - LOCAL 7421 HSTNSUBURB TX
— 281-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 281-312 9XXX which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 HUMBLE TX
— 281-313 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-314 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-315 0XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-316 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 LEAGUECITY TX
— 281-317 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C FRIENDSWD TX
— 281-318 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 HUMBLE TX
— 281-319 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 HUMBLE TX
— 281-320 4XXX which blocks → SOUTHWESTERN BELL 9533 TOMBALL TX
— 281-321 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-322 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-323 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRING TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.