NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 480
TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 1
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
— 480-348 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-350 7XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-354 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-357 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-358 5XXX7XXX8XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-363 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
— 480-366 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-367 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-368 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-373 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-375 0XXX1XXX5XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-377 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-379 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-380 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-383 3XXX6XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-384 0XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-385 8XXX9XXX which blocks → LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 PHOENIX AZ
— 480-387 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-390 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
— 480-391 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-394 1XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-396 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-397 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-403 1XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-410 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 480-413 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-419 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-421 8XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-422 8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
— 480-423 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-424 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-425 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-429 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-437 0XXX4XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-441 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-443 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-444 6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-445 9XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-446 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-449 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-451 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-452 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-456 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-457 0XXX9XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-459 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 480-460 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-461 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-464 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ

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.