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 503
ONVOY, LLC - OR 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
— 503-267 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-268 2XXX3XXX7XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-269 1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALEM OR
— 503-270 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-271 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-272 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 GOVENTCAMP OR
— 503-273 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-274 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-275 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-276 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-277 0XXX3XXX8XXX9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-279 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-280 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-281 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-282 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-283 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-284 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-285 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-286 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-287 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-288 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-289 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-290 3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PORTLAND OR
— 503-291 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-292 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-293 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-294 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-295 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-296 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-297 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-299 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-301 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-302 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
— 503-303 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLACKAMAS OR
— 503-304 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-305 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CLACKAMAS OR
— 503-306 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-307 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-308 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLATSKANIE OR
— 503-309 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-310 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 503-312 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-313 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-314 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-315 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-316 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-317 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-318 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-319 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR

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.