NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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 385
LEVEL 3 COMMUNICATIONS, LLC - UT 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-02-22 385-337 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
2018-02-02 385-260 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2018-01-11 385-437 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPANIHFORK UT
2017-12-28 385-867 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H SALT LAKE UT
2017-12-21 385-300 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E BOUNTIFUL UT
2017-12-19 385-522 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SALT LAKE UT
2017-12-18 385-666 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E PROVO UT
2017-12-13 385-465 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2017-12-08 385-787 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2017-11-08 385-450 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2017-10-25 385-293 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E AMERCNFORK UT
2017-09-25 385-279 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
2017-08-07 385-381 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FARMINGTON UT
2017-08-04 385-447 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2017-07-18 385-421 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ALTA UT
2017-07-17 385-422 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PAYSON UT
2017-07-17 385-602 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H SALT LAKE UT
2017-07-07 385-377 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2017-06-29 385-271 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D SALT LAKE UT
2017-06-08 385-505 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2017-03-30 385-274 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H MIDVALE UT
2017-03-28 385-264 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OGDEN UT
2017-03-28 385-278 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J KAYSVILLE UT
2017-03-28 385-484 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LEHI UT
2017-03-22 385-394 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2017-03-03 385-485 0–9 XXXall 10 · 5 holders which blocks → WIDE VOICE, LLC - UT 659H MURRAY UT
2017-01-16 385-285 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - UT 659H SALT LAKE UT
2016-12-30 385-277 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2016-12-30 385-423 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J CLEARFIELD UT
2016-12-14 385-429 0–9 XXXall 10 · 2 holders which blocks → TELNYX LLC 073H SALT LAKE UT
2016-11-30 385-266 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2016-11-30 385-425 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E MURRAY UT
2016-11-23 385-261 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SALT LAKE UT
2016-11-01 385-515 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2016-10-31 385-434 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2016-08-18 385-440 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PLEASATGRV UT
2016-07-28 385-289 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F OGDEN UT
2016-07-22 385-267 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SALT LAKE UT
2016-07-22 385-482 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2016-07-19 385-256 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2016-07-18 385-254 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E PROVO UT
2016-06-28 385-441 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2016-06-06 385-297 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 SALT LAKE UT
2016-05-26 385-268 0–9 XXXall 10 · 4 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D PROVO UT
2016-04-20 385-258 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2016-04-08 385-253 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2016-04-01 385-251 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2016-02-18 385-489 0–9 XXXall 10 · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOUNTIFUL UT
2016-01-28 385-331 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AMERCNFORK UT
2016-01-15 385-263 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E ALTA 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.