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
— 503-858 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
— 503-868 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 GRAND IS OR
— 503-869 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-870 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-871 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
— 503-872 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-873 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 SILVERTON OR
— 503-874 3XXX4XXX5XXX6XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 SILVERTON OR
— 503-876 9XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 WILLAMINA OR
— 503-878 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 STFRD-SNDY OR
— 503-879 7XXX8XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 GRANDRONDE OR
— 503-880 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-881 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALEM OR
— 503-882 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 CLACKAMAS OR
— 503-883 1XXX3XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 MCMINNVL OR
— 503-884 6XXX which blocks → T-MOBILE USA, INC. 6529 SALEM OR
— 503-885 3XXX4XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 STFRD-SNDY OR
— 503-886 8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-887 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-888 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-889 0XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-890 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-891 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-892 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-897 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MILL CITY OR
— 503-899 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 NEWBERG OR
— 503-901 2XXX3XXX4XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-903 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-904 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-905 3XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CLACKAMAS OR
— 503-906 0XXX2XXX5XXX8XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-907 2XXX3XXX4XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 GRESHAM OR
— 503-908 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J CLACKAMAS OR
— 503-909 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-910 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
— 503-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 503-913 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-914 3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-916 9XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-917 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 DALLAS OR
— 503-919 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CLACKAMAS OR
— 503-920 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-921 not yet reported which blocks → SPOK, INC. 6630 PORTLAND 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.