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
— 281-947 1XXX2XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J FRIENDSWD TX
— 281-948 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAMMEL TX
— 281-949 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 SATSUMA TX
— 281-950 not yet reported which blocks → TX
— 281-951 0XXX1XXX4XXX which blocks → ONVOY, LLC - TX 903C WESTFIELD TX
— 281-952 not yet reported which blocks → SPOK, INC. 6630 HOUSTON TX
— 281-953 not yet reported which blocks → ONVOY, LLC - TX 903C HOUSTON TX
— 281-954 1XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J APOLLO TX
— 281-955 not yet reported which blocks → SOUTHWESTERN BELL 9533 SATSUMA TX
— 281-956 0XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C APOLLO TX
— 281-957 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 KEMAH TX
— 281-958 not yet reported which blocks → TX
— 281-959 not yet reported which blocks → TX
— 281-960 none assigned yet which blocks → METROPCS, INC. 5562 HSTNSUBURB TX
— 281-961 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LANGHAMCRK TX
— 281-962 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 SHELDON TX
— 281-963 not yet reported which blocks → SPOK, INC. 6630 HOUSTON TX
— 281-964 5XXX7XXX8XXX9XXX which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 HUMBLE TX
— 281-965 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX
— 281-966 5XXX8XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-968 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ALVIN TX
— 281-969 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 STAFFORD TX
— 281-970 not yet reported which blocks → SOUTHWESTERN BELL 9533 SATSUMA TX
— 281-971 7XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HSTNSUBURB TX
— 281-972 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 ARCOLA TX
— 281-973 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HUMBLE TX
— 281-974 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 HOUSTON TX
— 281-975 3XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 BAMMEL TX
— 281-976 not yet reported which blocks → TX
— 281-977 0XXX9XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HSTNSUBURB TX
— 281-978 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-980 not yet reported which blocks → WINDSTREAM SUGAR LAND, LLC 2147 SUGAR LAND TX
— 281-981 not yet reported which blocks → SPOK, INC. 6630 HOUSTON TX
— 281-982 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 WESTFIELD TX
— 281-983 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-984 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C APOLLO TX
— 281-985 1XXX5XXX9XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-986 0XXX7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-987 4XXX5XXX which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-988 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-989 none assigned yet which blocks → METROPCS, INC. 5562 HOUSTON TX
— 281-990 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 APOLLO TX
— 281-991 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-992 6XXX which blocks → SOUTHWESTERN BELL 9533 FRIENDSWD TX
— 281-993 4XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FRIENDSWD TX
— 281-994 3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 BARKER TX
— 281-996 not yet reported which blocks → SOUTHWESTERN BELL 9533 FRIENDSWD TX
— 281-997 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-998 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB TX
— 281-999 not yet reported which blocks → SOUTHWESTERN BELL 9533 HSTNSUBURB 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.