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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 503-858 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 BEAVERTON OR
— 503-859 not yet reported which blocks → PEOPLES TEL. CO. 2391 LYONS OR
— 503-860 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-861 8XXX which blocks → QWEST CORPORATION 9638 WARRENTON OR
— 503-862 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 SHERWOOD OR
— 503-864 0XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 DAYTON OR
— 503-865 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-866 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 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.