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 512
SOUTHWESTERN BELL 274
NEW CINGULAR WIRELESS PCS, LLC - IL 98
T-MOBILE USA, INC. 70
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 49
LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 45
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
— 512-843 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN TX
— 512-844 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-845 none assigned yet which blocks → METROPCS, INC. 5562 AUSTIN TX
— 512-846 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 HUTTO TX
— 512-847 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 WIMBERLEY TX
— 512-848 none assigned yet which blocks → METROPCS, INC. 5562 AUSTIN TX
— 512-849 not yet reported which blocks → SPOK, INC. 6630 AUSTIN TX
— 512-851 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-853 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7249 AUSTIN TX
— 512-854 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-856 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 COUPLAND TX
— 512-857 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 AUSTIN TX
— 512-858 6XXX8XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 DRIPPNGSPG TX
— 512-859 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GRANGER TX
— 512-860 2XXX which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-861 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
— 512-862 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SANGABRIEL TX
— 512-863 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GEORGETOWN TX
— 512-864 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GEORGETOWN TX
— 512-867 5XXX which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-868 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GEORGETOWN TX
— 512-869 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GEORGETOWN TX
— 512-870 7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-873 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-874 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 AUSTIN TX
— 512-875 not yet reported which blocks → SPOK, INC. 6630 AUSTIN TX
— 512-876 0XXX1XXX2XXX · 3 holders which blocks → METROPCS, INC. 5562 GEORGETOWN TX
— 512-878 3XXX6XXX7XXX9XXX · 2 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 SAN MARCOS TX
— 512-879 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 AUSTIN TX
— 512-891 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-892 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-894 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 DRIPPNGSPG TX
— 512-895 0XXX9XXX which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-896 not yet reported which blocks → SPOK, INC. 6630 AUSTIN TX
— 512-898 3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 THORNDTHRL TX
— 512-899 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-901 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 AUSTIN TX
— 512-907 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-908 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 512-912 6XXX which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-913 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-914 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-916 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-917 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-918 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-919 0XXX2XXX4XXX6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-921 6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-922 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-923 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN 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.