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 817
SOUTHWESTERN BELL 302
NEW CINGULAR WIRELESS PCS, LLC - IL 88
T-MOBILE USA, INC. 54
LEVEL 3 COMMUNICATIONS, LLC - TX 45
ONVOY, LLC - TX 43
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
— 817-931 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-932 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-934 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C ATLAS TX
— 817-935 0XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-937 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-938 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-939 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-942 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-944 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-946 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
— 817-947 0–9 XXXall 10 · 3 holders which blocks → EXIANT COMMUNICATIONS LLC 114J KENNEDALE TX
— 817-949 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GRAPEVINE TX
— 817-950 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 817-952 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-953 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
— 817-955 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 817-956 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-957 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-958 not yet reported which blocks → TX
— 817-959 not yet reported which blocks → TX
— 817-961 1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ROANOKE TX
— 817-962 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-963 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-966 not yet reported which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-967 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-968 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 NRICHLDHLS TX
— 817-969 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C KENNEDALE TX
— 817-972 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 817-974 not yet reported which blocks → TX
— 817-975 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
— 817-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 817-978 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-979 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-980 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-983 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLINGTON TX
— 817-984 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FORT WORTH TX
— 817-985 3XXX4XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - TX 903C KENNEDALE TX
— 817-986 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
— 817-987 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 ARLINGTON TX
— 817-988 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-989 0XXX2XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-991 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-992 2XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-993 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KELLER TX
— 817-994 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-996 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-999 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE 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.