NumberResearchRecent prefix assignments
374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026
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
New assignments by month
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Quick find in this area code:
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 503-591 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-592 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 TELECOM OF OREGON, LLC - OR | 7537 | CANBYNEEDY | OR |
| — | 503-594 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | CLACKAMAS | OR |
| — | 503-595 | not yet reported which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | PORTLAND | OR |
| — | 503-596 | 2XXX which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-597 | 4XXX6XXX8XXX9XXX · 3 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | BEAVERTON | OR |
| — | 503-598 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-599 | not yet reported which blocks → | SPOK, INC. | 6630 | PORTLAND | OR |
| — | 503-601 | 9XXX which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | BEAVERTON | OR |
| — | 503-602 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | SALEM | OR |
| — | 503-603 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-604 | not yet reported which blocks → | SPOK, INC. | 6630 | PORTLAND | OR |
| — | 503-605 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-606 | 6XXX7XXX8XXX · 2 holders which blocks → | QWEST CORPORATION | 9638 | DALLAS | OR |
| — | 503-607 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | CLACKAMAS | OR |
| — | 503-608 | 0XXX2XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF OREGON, LLC - OR | 7537 | BEAVERTON | OR |
| — | 503-610 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SHERWOOD | OR |
| — | 503-611 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | OR |
| — | 503-612 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | STFRD-SNDY | OR |
| — | 503-613 | not yet reported which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEAVERTON | OR |
| — | 503-614 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-615 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-616 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BEAVERTON | OR |
| — | 503-617 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-618 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | GRESHAM | OR |
| — | 503-619 | 1XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | BEAVERTON | OR |
| — | 503-620 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-621 | 2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-622 | 8XXX9XXX · 2 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | HOOD LAND | OR |
| — | 503-623 | not yet reported which blocks → | QWEST CORPORATION | 9638 | DALLAS | OR |
| — | 503-624 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-625 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | SHERWOOD | OR |
| — | 503-626 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-627 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-628 | 9XXX which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-629 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-630 | not yet reported which blocks → | CASCADE UTILITIES, INC. | 2371 | ESTACADA | OR |
| — | 503-631 | not yet reported which blocks → | CLEAR CREEK MUTUAL TEL. CO. | 2363 | REDLAND | OR |
| — | 503-632 | not yet reported which blocks → | BEAVER CREEK COOP. TEL. CO. | 2359 | BEAVER CRK | OR |
| — | 503-633 | not yet reported which blocks → | ST. PAUL COOP. TEL. ASSN. | 2396 | ST PAUL | OR |
| — | 503-634 | not yet reported which blocks → | MONITOR COOP. TEL. CO. | 2384 | MONITOR | OR |
| — | 503-635 | not yet reported which blocks → | QWEST CORPORATION | 9638 | CLACKAMAS | OR |
| — | 503-636 | not yet reported which blocks → | QWEST CORPORATION | 9638 | CLACKAMAS | OR |
| — | 503-637 | not yet reported which blocks → | CASCADE UTILITIES, INC. | 2371 | ESTACADA | OR |
| — | 503-638 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | STFRD-SNDY | OR |
| — | 503-639 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-640 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-641 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-642 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-643 | 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.