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 |
|---|---|---|---|---|---|---|
| — | 503-802 | not yet reported which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | PORTLAND | OR |
| — | 503-803 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-804 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-805 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-806 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-807 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-808 | 0XXX7XXX8XXX9XXX · 3 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | PORTLAND | OR |
| — | 503-809 | 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | NORTH PL | OR |
| — | 503-810 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | PORTLAND | OR |
| — | 503-811 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | OR |
| — | 503-812 | 4XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR | 5820 | TILLAMOOK | OR |
| — | 503-813 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-815 | not yet reported which blocks → | UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR | 4520 | TILLAMOOK | OR |
| — | 503-816 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-817 | not yet reported which blocks → | SPOK, INC. | 6630 | PORTLAND | OR |
| — | 503-818 | not yet reported which blocks → | SPOK, INC. | 6630 | PORTLAND | OR |
| — | 503-819 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-820 | 1XXX3XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PORTLAND | OR |
| — | 503-821 | 6XXX7XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PORTLAND | OR |
| — | 503-822 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - OR | 3234 | SHERWOOD | OR |
| — | 503-823 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-824 | not yet reported which blocks → | COLTON TEL. CO. | 2364 | COLTON | OR |
| — | 503-825 | 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - OR | 7531 | SHERWOOD | OR |
| — | 503-826 | 2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | STFRD-SNDY | OR |
| — | 503-827 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-828 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - OR | 3234 | BEAVERTON | OR |
| — | 503-829 | not yet reported which blocks → | MOLALLA TEL. CO. | 2383 | MOLALLA | OR |
| — | 503-830 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PORTLAND | OR |
| — | 503-831 | 7XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9638 | DALLAS | OR |
| — | 503-832 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - OR | 750E | STFRD-SNDY | OR |
| — | 503-833 | 2XXX which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-834 | not yet reported which blocks → | CASCADE UTILITIES, INC. | 2371 | ESTACADA | OR |
| — | 503-835 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | AMITY | OR |
| — | 503-837 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - OR | 750E | DALLAS | OR |
| — | 503-838 | not yet reported which blocks → | QWEST CORPORATION | 9638 | DALLAS | OR |
| — | 503-840 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF OREGON, LLC - OR | 7537 | BEAVERTON | OR |
| — | 503-842 | not yet reported which blocks → | UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR | 4520 | TILLAMOOK | OR |
| — | 503-843 | 8XXX9XXX · 2 holders which blocks → | UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR | 4520 | SHERIDAN | OR |
| — | 503-844 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-845 | not yet reported which blocks → | MT. ANGEL TEL. CO. | 2386 | MOUNTANGEL | OR |
| — | 503-846 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | BEAVERTON | OR |
| — | 503-848 | not yet reported which blocks → | ZIPLY FIBER PACIFIC, LLC DBA ZIPLY FIBER | 517K | BEAVERTON | OR |
| — | 503-849 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | PORTLAND | OR |
| — | 503-850 | 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF OREGON, LLC - OR | 7537 | CLACKAMAS | OR |
| — | 503-851 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | SALEM | OR |
| — | 503-852 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR | 4520 | CARLTON | OR |
| — | 503-854 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4323 | DETROIT | OR |
| — | 503-855 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF OREGON, LLC - OR | 7537 | STFRD-SNDY | OR |
| — | 503-856 | 2XXX4XXX5XXX6XXX · 2 holders which blocks → | QWEST CORPORATION | 9638 | SALEM | OR |
| — | 503-857 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF OREGON, LLC - OR | 7537 | MCMINNVL | 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.