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
— 435-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 435-324 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E HEBER CITY UT
— 435-326 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 MARYSVALE UT
— 435-335 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 BOULDER UT
— 435-338 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TOOELE UT
— 435-340 2XXX6XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EPHRAIM UT
— 435-347 not yet reported which blocks → UT
— 435-349 not yet reported which blocks → UT
— 435-353 not yet reported which blocks → UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS 2287 NEOLA UT
— 435-359 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E ST GEORGE UT
— 435-363 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 LOGAN UT
— 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

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.