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
— 281-878 9XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-879 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-880 not yet reported which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-882 3XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-883 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 HUMBLE TX
— 281-884 2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 DEER PARK TX
— 281-885 8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 BAMMEL TX
— 281-886 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 HSTNSUBURB TX
— 281-890 not yet reported which blocks → SOUTHWESTERN BELL 9533 SATSUMA TX
— 281-891 0XXX3XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-892 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 HSTNSUBURB TX
— 281-893 not yet reported which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-894 not yet reported which blocks → SOUTHWESTERN BELL 9533 SATSUMA TX
— 281-895 1XXX2XXX3XXX which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-897 not yet reported which blocks → SOUTHWESTERN BELL 9533 SATSUMA TX
— 281-899 0XXX5XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-901 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 HSTNSUBURB TX
— 281-902 2XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 HSTNSUBURB TX
— 281-903 0XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 SUGAR LAND TX
— 281-907 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 SPRING TX
— 281-909 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SEABROOK TX
— 281-910 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 DICKINSON TX
— 281-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 281-913 5XXX6XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 HUMBLE TX
— 281-914 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HOUSTON TX
— 281-915 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ARCOLA TX
— 281-919 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-920 1XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-921 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 HSTNSUBURB TX
— 281-922 0XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-923 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LANGHAMCRK TX
— 281-924 none assigned yet which blocks → METROPCS, INC. 5562 HSTNSUBURB TX
— 281-925 7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HSTNSUBURB TX
— 281-926 not yet reported which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-927 not yet reported which blocks → SOUTHWESTERN BELL 9533 BAMMEL TX
— 281-929 0XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-930 5XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DEER PARK TX
— 281-931 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-932 none assigned yet which blocks → METROPCS, INC. 5562 HOUSTON TX
— 281-933 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-934 0XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CONSOLIDATED COMMUNICATIONS OF TEXAS COMPANY 2109 BROOKSHIRE TX
— 281-935 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
— 281-937 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SMITHERSLK TX
— 281-938 not yet reported which blocks → ONVOY, LLC - TX 903C APOLLO TX
— 281-940 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - TX 903C HSTNSUBURB TX
— 281-941 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 LA PORTE TX
— 281-942 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SEABROOK TX
— 281-943 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 BAMMEL TX
— 281-944 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 BARKER TX
— 281-946 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J DEER PARK 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.