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
— 435-878 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 ENTERPRISE UT
— 435-879 1XXX3XXX5XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-880 not yet reported which blocks → UNION TELEPHONE COMPANY 013B DUTCH JOHN UT
— 435-881 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
— 435-882 not yet reported which blocks → QWEST CORPORATION 9636 TOOELE UT
— 435-884 2XXX7XXX which blocks → QWEST CORPORATION 9636 TOOELE UT
— 435-885 not yet reported which blocks → UNION TEL. CO. 2297 DUTCH JOHN UT
— 435-888 not yet reported which blocks → CARBON/EMERY TELCOM, INC. - UT 1190 PRICE UT
— 435-889 not yet reported which blocks → UNION TEL. CO. 2297 GREENDALE UT
— 435-890 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
— 435-893 3XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9636 RICHFIELD UT
— 435-896 none assigned yet which blocks → QWEST CORPORATION 9636 RICHFIELD UT
— 435-899 2XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KANAB UT
— 435-901 5XXX6XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PARK CITY UT
— 435-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 435-915 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - UT 871E LOGAN UT
— 435-919 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E BRIGHAM CY UT
— 435-921 0XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 BRIGHAM CY UT
— 435-928 not yet reported which blocks → UT
— 435-932 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LOGAN UT
— 435-938 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 LOGAN UT
— 435-940 4XXX which blocks → QWEST CORPORATION 9636 PARK CITY UT
— 435-946 not yet reported which blocks → BEAR LAKE COMMUNICATIONS 3032 GARDENCITY UT
— 435-948 not yet reported which blocks → UNION TELEPHONE COMPANY 013B GARDENCITY UT
— 435-950 not yet reported which blocks → UT
— 435-958 not yet reported which blocks → UT
— 435-959 not yet reported which blocks → UT
— 435-962 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PARK CITY UT
— 435-970 not yet reported which blocks → UT
— 435-976 not yet reported which blocks → UT
— 435-979 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RICHFIELD UT
— 435-986 not yet reported which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-988 not yet reported which blocks → UT
— 435-990 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIAN HEAD UT
— 435-994 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LOGAN UT
— 435-999 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
— 436-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OH
— 436-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-700 not yet reported which blocks → OH
— 436-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 436-950 not yet reported which blocks → OH
— 436-958 not yet reported which blocks → OH
— 436-959 not yet reported which blocks → OH
— 436-976 not yet reported which blocks → OH

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.