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 281
SOUTHWESTERN BELL 283
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 66
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 57
NEW CINGULAR WIRELESS PCS, LLC - IL 50
WINDSTREAM SUGAR LAND, LLC 38
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
— 281-822 not yet reported which blocks → ONVOY, LLC - TX 903C HOUSTON TX
— 281-823 2XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 APOLLO TX
— 281-824 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ALVIN TX
— 281-825 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-826 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 TOMBALL TX
— 281-827 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 HOUSTON TX
— 281-828 5XXX which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 BARKER TX
— 281-829 4XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BARKER TX
— 281-830 none assigned yet which blocks → METROPCS, INC. 5562 HSTNSUBURB TX
— 281-831 none assigned yet which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
— 281-833 7XXX which blocks → ONVOY, LLC - TX 903C HOUSTON TX
— 281-834 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BAYTOWN TX
— 281-835 4XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-836 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 BAMMEL TX
— 281-837 3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BAYTOWN TX
— 281-838 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BAYTOWN TX
— 281-839 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BAYTOWN TX
— 281-842 2XXX which blocks → SOUTHWESTERN BELL 9533 LA PORTE TX
— 281-843 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 HIGHLANDS TX
— 281-844 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
— 281-845 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 ARCOLA TX
— 281-846 0–9 XXXall 10 · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HOUSTON TX
— 281-847 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-848 8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HSTNSUBURB TX
— 281-849 1XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 LANGHAMCRK TX
— 281-850 none assigned yet which blocks → METROPCS, INC. 5562 HSTNSUBURB TX
— 281-851 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
— 281-852 not yet reported which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 HUMBLE TX
— 281-853 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-854 4XXX5XXX7XXX8XXX9XXX which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 HSTNSUBURB TX
— 281-855 not yet reported which blocks → SOUTHWESTERN BELL 9533 LANGHAMCRK TX
— 281-856 not yet reported which blocks → SOUTHWESTERN BELL 9533 LANGHAMCRK TX
— 281-858 2XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LANGHAMCRK TX
— 281-859 not yet reported which blocks → SOUTHWESTERN BELL 9533 LANGHAMCRK TX
— 281-860 2XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CHANNELVW TX
— 281-861 1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LANGHAMCRK TX
— 281-862 3XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CHANNELVW TX
— 281-863 7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-864 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CHANNELVW TX
— 281-866 1XXX4XXX5XXX which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-867 5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LA PORTE TX
— 281-869 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 WESTFIELD TX
— 281-870 2XXX3XXX4XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-871 0XXX1XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-872 6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-873 not yet reported which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-874 not yet reported which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-875 5XXX which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-876 7XXX which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-877 2XXX which blocks → SOUTHWESTERN BELL 9533 BAMMEL 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.