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
— 435-513 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
— 435-554 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 LOGAN UT
— 435-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST UT
— 435-559 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CEDAR CITY UT
— 435-563 not yet reported which blocks → QWEST CORPORATION 9636 LOGAN UT
— 435-564 not yet reported which blocks → EMERY TELEPHONE DBA EMERY TELCOM 2278 GREENRIVER UT
— 435-574 1XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-577 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 CIRCLEVL UT
— 435-578 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TOOELE UT
— 435-579 5XXX6XXX · 2 holders which blocks → XO UTAH, INC. 7541 TOOELE UT
— 435-586 not yet reported which blocks → QWEST CORPORATION 9636 CEDAR CITY UT
— 435-587 not yet reported which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 MONTICELLO UT
— 435-590 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 CEDAR CITY UT
— 435-592 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 CEDAR CITY UT
— 435-602 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 PARK CITY UT
— 435-604 5XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 PARK CITY UT
— 435-608 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PARK CITY UT
— 435-609 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 CASTLEDALE UT
— 435-610 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 NEPHI UT
— 435-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 435-613 not yet reported which blocks → CARBON/EMERY TELCOM, INC. - UT 1190 PRICE UT
— 435-615 not yet reported which blocks → QWEST CORPORATION 9636 PARK CITY UT
— 435-616 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 PANGUITCH UT
— 435-618 1XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PANGUITCH UT
— 435-619 8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
— 435-622 none assigned yet which blocks → UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS 2287 FLATTOP UT
— 435-623 none assigned yet which blocks → QWEST CORPORATION 9636 NEPHI UT
— 435-624 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 ANTIMONY UT
— 435-627 3XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-628 not yet reported which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-630 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PRICE UT
— 435-632 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
— 435-634 not yet reported which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-635 not yet reported which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-636 not yet reported which blocks → CARBON/EMERY TELCOM, INC. - UT 1190 PRICE UT
— 435-637 not yet reported which blocks → CARBON/EMERY TELCOM, INC. - UT 1190 PRICE UT
— 435-638 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 KOOSHAREM UT
— 435-640 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
— 435-642 not yet reported which blocks → UNION TEL. CO. 2297 CHRISTMMDW UT
— 435-644 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 KANAB 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.