NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 425
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 122
T-MOBILE USA, INC. 91
QWEST CORPORATION 69
LEVEL 3 COMMUNICATIONS, LLC - WA 49
NEW CINGULAR WIRELESS PCS, LLC 44
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
— 425-814 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-818 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
— 425-820 not yet reported which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K KIRKLAND WA
— 425-821 not yet reported which blocks → ZIPLY FIBER NORTHWEST LLC DBA ZIPLY FIBER 427K KIRKLAND WA
— 425-822 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-823 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-825 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-827 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-828 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-829 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-830 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-831 none assigned yet which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 NORTH BEND WA
— 425-835 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 HALLS LAKE WA
— 425-836 6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-837 2XXX which blocks → QWEST CORPORATION 9638 ISSAQUAH WA
— 425-844 5XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
— 425-861 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-864 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-865 not yet reported which blocks → QWEST CORPORATION 9638 BELLEVUE WA
— 425-867 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-868 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-869 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-870 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
— 425-871 not yet reported which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
— 425-873 0XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RENTON WA
— 425-876 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-877 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 BOTHELL WA
— 425-879 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EVERETT WA
— 425-880 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 AMES LAKE WA
— 425-881 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-882 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-883 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-885 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-888 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 NORTH BEND WA
— 425-889 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-890 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
— 425-891 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-892 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BOTHELL WA
— 425-893 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-894 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
— 425-895 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-896 3XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 KIRKLAND WA
— 425-897 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 KIRKLAND WA
— 425-898 2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-899 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
— 425-902 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 RENTON WA
— 425-903 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 EVERETT WA
— 425-905 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WA 483E EVERETT WA
— 425-906 1XXX2XXX7XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E MAPLE VLY WA
— 425-908 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.