NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 210
SOUTHWESTERN BELL 281
NEW CINGULAR WIRELESS PCS, LLC - IL 129
T-MOBILE USA, INC. 94
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 54
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 39
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
— 210-871 0XXX1XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-872 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANANTONIO TX
— 210-874 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
— 210-877 4XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-878 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 SANANTONIO TX
— 210-879 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F SANANTONIO TX
— 210-882 0XXX2XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-883 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SANANTONIO TX
— 210-884 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
— 210-885 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
— 210-886 8XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-887 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
— 210-889 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
— 210-892 not yet reported which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - TX 7715 SANANTONIO TX
— 210-893 not yet reported which blocks → MATRIX TELECOM, LLC. S/I/I TNCI - TX 7715 SANANTONIO TX
— 210-900 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
— 210-905 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
— 210-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 210-912 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANANTONIO TX
— 210-913 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANANTONIO TX
— 210-916 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 8434 SANANTONIO TX
— 210-921 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-922 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-923 9XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-924 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-925 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 8434 SANANTONIO TX
— 210-927 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-928 2XXX5XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-930 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-932 3XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-933 0XXX1XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANANTONIO TX
— 210-937 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SANANTONIO TX
— 210-938 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-945 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-946 0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-949 not yet reported which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-950 not yet reported which blocks → TX
— 210-958 not yet reported which blocks → TX
— 210-959 not yet reported which blocks → TX
— 210-966 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SANANTONIO TX
— 210-967 3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-971 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANANTONIO TX
— 210-976 not yet reported which blocks → TX
— 210-977 0XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-978 0XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-979 1XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-989 0XXX which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
— 210-991 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SANANTONIO TX
— 210-994 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C SANANTONIO TX
— 210-999 0XXX1XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.