NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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, last 30 days
8X8, INC. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
— 276-950 not yet reported which blocks → VA
— 276-952 9XXX which blocks → BRIGHTSPEED OF VIRGINIA, LLC 0254 MEADOWSDAN VA
— 276-954 not yet reported which blocks → VERIZON SOUTH, INC. - VA 4337 BLUEFIELD VA
— 276-956 not yet reported which blocks → BRIGHTSPEED OF VIRGINIA, LLC 0254 RIDGEWAY VA
— 276-957 not yet reported which blocks → BRIGHTSPEED OF VIRGINIA, LLC 0254 SPENCER VA
— 276-958 not yet reported which blocks → VA
— 276-959 not yet reported which blocks → VA
— 276-963 not yet reported which blocks → VERIZON SOUTH, INC. - VA 4337 RICHLANDS VA
— 276-964 not yet reported which blocks → VERIZON SOUTH, INC. - VA 4337 RICHLANDS VA
— 276-970 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RICHLANDS VA
— 276-971 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 RICHLANDS VA
— 276-973 6XXX which blocks → VERIZON VIRGINIA, INC. 9213 NORTON VA
— 276-976 not yet reported which blocks → VA
— 276-979 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON SOUTH, INC. - VA 4337 TAZEWELL VA
— 276-988 not yet reported which blocks → VERIZON SOUTH, INC. - VA 4337 TAZEWELL VA
— 276-991 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON VIRGINIA, INC. 9213 HONAKER VA
— 276-995 not yet reported which blocks → SCOTT COUNTY TEL. COOP., INC. 0248 FT BLACKMR VA
— 279-200 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J SCRM MAIN CA
— 279-209 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ELK GROVE CA
— 279-210 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SCRM MAIN CA
— 279-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-231 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J SCRM MAIN CA
— 279-233 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J SCRM NORTH CA
— 279-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-321 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C FOLSOM CA
— 279-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST CA
— 279-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-700 not yet reported which blocks → CA
— 279-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-950 not yet reported which blocks → CA
— 279-958 not yet reported which blocks → CA
— 279-959 not yet reported which blocks → CA
— 279-976 not yet reported which blocks → CA
— 281-200 1XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - TX 903C LANGHAMCRK TX
— 281-201 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AT&T - LOCAL 7421 SUGAR LAND TX
— 281-202 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 RICHMNRNBG TX
— 281-203 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SPRING TX
— 281-204 2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 APOLLO TX
— 281-205 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 TOMBALL TX
— 281-206 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → AT&T - LOCAL 7421 BARKER TX
— 281-207 6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 SUGAR LAND TX
— 281-208 7XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 STAFFORD TX
— 281-209 5XXX which blocks → SOUTHWESTERN BELL 9533 WESTFIELD TX
— 281-210 4XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7074 SPRING TX
— 281-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 281-212 0XXX3XXX4XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 APOLLO TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.