NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

375 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026

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 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
— 541-530 4XXX5XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ROSEBURG OR
— 541-531 0–9 XXXall 10 · 3 holders which blocks → UNITED STATES CELLULAR - OR 6349 MEDFORD OR
— 541-533 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SPRAGUERIV OR
— 541-534 0XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 IMBLER OR
— 541-535 not yet reported which blocks → QWEST CORPORATION 9638 PHOENIX OR
— 541-536 4XXX which blocks → QWEST CORPORATION 9638 LAPINE OR
— 541-538 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 WHITE CITY OR
— 541-542 6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SENECA OR
— 541-543 2XXX which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-544 4XXX7XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 WAMIC OR
— 541-545 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 BONANZA OR
— 541-546 0XXX1XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9638 CULVER OR
— 541-547 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 YACHATS OR
— 541-548 not yet reported which blocks → QWEST CORPORATION 9638 REDMOND OR
— 541-549 not yet reported which blocks → QWEST CORPORATION 9638 SISTERS OR
— 541-552 3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9638 ASHLAND OR
— 541-553 not yet reported which blocks → QWEST CORPORATION 9638 MADRAS OR
— 541-554 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OR
— 541-556 4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-557 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 LINCOLN CY OR
— 541-558 none assigned yet which blocks → QWEST CORPORATION 9638 STATELINE OR
— 541-559 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OR 750E MYRTLE PT OR
— 541-560 5XXX6XXX7XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 PROSPECT OR
— 541-561 1XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 HERMISTON OR
— 541-562 0XXX2XXX3XXX4XXX7XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 UNION OR
— 541-563 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 WALDPORT OR
— 541-564 not yet reported which blocks → QWEST CORPORATION 9638 HERMISTON OR
— 541-565 4XXX6XXX7XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 MORO OR
— 541-566 4XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 ATHENA OR
— 541-567 not yet reported which blocks → QWEST CORPORATION 9638 HERMISTON OR
— 541-568 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 COVE OR
— 541-569 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LOSTINE OR
— 541-570 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 LEBANON OR
— 541-571 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 HERMISTON OR
— 541-572 6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-573 9XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 BURNS OR
— 541-574 not yet reported which blocks → QWEST CORPORATION 9638 NEWPORT OR
— 541-575 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 JOHN DAY OR
— 541-576 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SILVERLAKE OR
— 541-577 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 JOSEPH OR
— 541-578 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 MOSIER OR
— 541-579 2XXX8XXX which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-580 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ROSEBURG OR
— 541-582 7XXX which blocks → QWEST CORPORATION 9638 ROGUERIVER OR
— 541-584 not yet reported which blocks → CASCADE UTILITIES, INC. 2371 ELKTON OR
— 541-585 not yet reported which blocks → ONVOY, LLC - OR 750E BEND OR
— 541-586 not yet reported which blocks → OREGON-IDAHO UTILITIES, INC. 2390 JORDAN VLY OR
— 541-587 not yet reported which blocks → CASCADE UTILITIES, INC. 2371 SCOTTSBURG OR
— 541-588 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 SISTERS OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.