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
— 503-938 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-939 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-940 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-941 0XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 BEAVERTON OR
— 503-942 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-943 0XXX6XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
— 503-944 9XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-945 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-946 1XXX3XXX5XXX6XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-947 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-948 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-949 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 SALEM OR
— 503-950 not yet reported which blocks → OR
— 503-951 4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 WOODBURN OR
— 503-952 6XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-955 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-957 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-958 not yet reported which blocks → OR
— 503-959 not yet reported which blocks → OR
— 503-961 0XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
— 503-962 0XXX9XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-963 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-965 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 PACIFIC CY OR
— 503-967 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 SALEM OR
— 503-968 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-969 none assigned yet which blocks → METROPCS, INC. 5562 PORTLAND OR
— 503-970 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-971 not yet reported which blocks → OR
— 503-972 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
— 503-973 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-974 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CLACKAMAS OR
— 503-975 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-976 not yet reported which blocks → OR
— 503-977 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-978 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-980 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 WOODBURN OR
— 503-981 not yet reported which blocks → QWEST CORPORATION 9638 WOODBURN OR
— 503-982 not yet reported which blocks → QWEST CORPORATION 9638 WOODBURN OR
— 503-984 4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WOODBURN OR
— 503-985 2XXX6XXX8XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-986 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-988 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-989 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WOODBURN OR
— 503-990 6XXX7XXX8XXX which blocks → METROPCS, INC. 5562 SALEM OR
— 503-991 2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 SALEM OR
— 503-992 6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-993 not yet reported which blocks → SPOK, INC. 6630 PORTLAND OR
— 503-997 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-998 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-999 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALEM 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.