NumberResearch Membership · Data 10/01/2026

Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 503-478 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-479 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 CLACKAMAS OR
— 503-480 4XXX5XXX6XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 SALEM OR
— 503-481 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-482 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 STFRD-SNDY OR
— 503-484 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-485 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 SALEM OR
— 503-486 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 STFRD-SNDY OR
— 503-487 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 NEWBERG OR
— 503-488 0XXX5XXX6XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 PORTLAND OR
— 503-489 3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 GRESHAM OR
— 503-490 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-491 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 GRESHAM OR
— 503-492 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 GRESHAM OR
— 503-493 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-494 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-495 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-496 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CLACKAMAS OR
— 503-497 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-498 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 STFRD-SNDY OR
— 503-499 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-502 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-504 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-506 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 STFRD-SNDY OR
— 503-507 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
— 503-508 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALEM OR
— 503-510 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALEM OR
— 503-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 503-512 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 GRESHAM OR
— 503-513 not yet reported which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-514 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-515 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-516 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-517 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
— 503-518 not yet reported which blocks → BEAVER CREEK COOPERATIVE TELEPHONE COMPANY - OR 461J CLACKAMAS OR
— 503-519 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-520 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-521 6XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-522 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-523 3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 BEAVERTON OR
— 503-524 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-525 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-526 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-527 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-528 4XXX6XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-529 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-530 0XXX6XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-531 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-532 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEAVERTON OR
— 503-533 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.