NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, 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
Clear Download CSV ↓
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 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.