NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

5 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, last 30 days — NPA 435
UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 4
TDS BROADBAND SERVICE LLC 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 435-381 not yet reported which blocks → EMERY TELEPHONE DBA EMERY TELCOM 2278 CASTLEDALE UT
— 435-383 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - UT 871E CEDAR CITY UT
— 435-384 not yet reported which blocks → EMERY TELEPHONE DBA EMERY TELCOM 2278 CASTLEDALE UT
— 435-385 not yet reported which blocks → UT
— 435-386 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 MINERSVL UT
— 435-387 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 MILFORD UT
— 435-406 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 DELTA UT
— 435-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 435-417 not yet reported which blocks → ONVOY, LLC - UT 871E NEPHI UT
— 435-418 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BEAVER UT
— 435-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MONTICELLO UT
— 435-421 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BEAVER UT
— 435-425 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 BICKNELL UT
— 435-427 not yet reported which blocks → CENTRAL UTAH TEL., INC. 2277 FAIRVIEW UT
— 435-433 not yet reported which blocks → SKYLINE TELECOM 2283 EUREKA UT
— 435-435 not yet reported which blocks → UT
— 435-436 not yet reported which blocks → SKYLINE TELECOM 2283 MORONI UT
— 435-438 4XXX which blocks → QWEST CORPORATION 9636 BEAVER UT
— 435-439 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 BERYL UT
— 435-445 not yet reported which blocks → CENTRAL UTAH TEL., INC. 2277 FOUNTAGREN UT
— 435-448 not yet reported which blocks → CENTRAL UTAH TEL., INC. 2277 SCOFIELD UT
— 435-452 none assigned yet which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 BEARRIV CY UT
— 435-454 not yet reported which blocks → UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS 2287 ALTAMONT UT
— 435-456 not yet reported which blocks → BEEHIVE TELEPHONE COMPANY, INC. (UTAH) 4611 CAINEVILLE UT
— 435-458 none assigned yet which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 FIELDING UT
— 435-459 6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MONTICELLO UT
— 435-462 not yet reported which blocks → CENTRAL UTAH TEL., INC. 2277 MTPLEASANT UT
— 435-463 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 CEDAR CITY UT
— 435-467 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 ST GEORGE UT
— 435-469 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MTPLEASANT UT
— 435-471 not yet reported which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 HOWELL UT
— 435-472 not yet reported which blocks → CARBON/EMERY TELCOM, INC. - UT 1190 PRICE UT
— 435-473 not yet reported which blocks → NORTH COUNTY COMMUNICATIONS CORPORATION - UT 872A HOWELL UT
— 435-477 2XXX4XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9636 PAROWAN UT
— 435-487 not yet reported which blocks → XO UTAH, INC. 7541 PARK CITY UT
— 435-496 1XXX2XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 TOOELE UT
— 435-503 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HEBER CITY UT
— 435-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 435-512 not yet reported which blocks → T-MOBILE USA, INC. 6529 LOGAN UT
— 435-513 3XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PARK CITY UT
— 435-514 0XXX1XXX2XXX3XXX5XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 LOGAN UT
— 435-518 not yet reported which blocks → ONVOY, LLC - UT 871E SALINA UT
— 435-527 2XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 MONROE UT
— 435-528 not yet reported which blocks → GUNNISON TEL. CO. 2279 GUNNISON UT
— 435-529 8XXX which blocks → QWEST CORPORATION 9636 SALINA UT
— 435-531 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CEDAR CITY UT
— 435-535 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 LOGAN UT
— 435-542 not yet reported which blocks → HANKSVILLE TELCOM, INC. - UT 1192 HANKSVILLE UT
— 435-545 not yet reported which blocks → UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS 2287 RANDLETT UT
— 435-548 not yet reported which blocks → UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS 2287 FRUITLAND UT

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.