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
— 512-763 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GEORGETOWN TX
— 512-764 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 DALE/LTNSP TX
— 512-767 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-768 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ADAMSVILLE TX
— 512-770 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 AUSTIN TX
— 512-771 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-772 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BASTROP TX
— 512-773 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-775 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-778 0XXX2XXX3XXX4XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 LIBERTY HL TX
— 512-779 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-782 0–9 XXXall 10 · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-784 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-785 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-787 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS TX
— 512-789 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-791 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-793 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 BUCHANNDAM TX
— 512-794 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-795 1XXX4XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-796 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-797 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-798 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - TX 7715 SMITHVILLE TX
— 512-799 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-801 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-802 not yet reported which blocks → SPOK, INC. 6630 AUSTIN TX
— 512-804 6XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-805 none assigned yet which blocks → BRIGHTSPEED OF SOUTHERN TEXAS, INC. 2140 SAN MARCOS TX
— 512-809 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
— 512-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 512-818 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GEORGETOWN TX
— 512-819 1XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GEORGETOWN TX
— 512-821 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-823 0XXX1XXX2XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-824 not yet reported which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - TX 7715 TAYLOR TX
— 512-825 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-826 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
— 512-827 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
— 512-828 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-829 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 DRIPPNGSPG TX
— 512-830 not yet reported which blocks → TX
— 512-832 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-833 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-834 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-835 8XXX which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-836 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-837 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-838 1XXX3XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-841 not yet reported which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
— 512-842 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 WIMBERLEY 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.