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
2012-03-30 385-393 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F CLEARFIELD UT
2012-03-28 385-206 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2012-03-06 385-985 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2012-01-23 385-428 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MURRAY UT
2012-01-04 385-275 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
2011-12-30 385-203 0–9 XXXall 10 · 3 holders which blocks → FIRSTDIGITAL TELECOM, LLC - UT 5727 PROVO UT
2011-12-14 385-215 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G SALT LAKE UT
2011-09-28 385-313 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2011-09-27 385-282 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2011-09-20 385-399 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F BOUNTIFUL UT
2011-09-19 385-242 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2011-09-01 385-252 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2011-08-12 385-245 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2011-08-01 385-319 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2011-07-27 385-439 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2011-07-25 385-233 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PLEASATGRV UT
2011-07-12 385-229 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2011-07-06 385-259 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2011-06-16 385-201 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2011-06-13 385-225 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2011-06-13 385-227 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2011-05-26 385-205 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OGDEN UT
2011-05-23 385-200 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SPANIHFORK UT
2011-05-23 385-244 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F OGDEN UT
2011-05-06 385-202 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2011-03-09 385-226 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2010-12-17 385-212 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2010-12-13 385-218 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2010-11-11 385-628 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-09-15 385-232 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2010-04-22 385-208 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2009-08-21 385-351 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
2009-06-29 385-204 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2009-06-11 385-468 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 SALT LAKE UT
2009-06-11 385-743 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 MURRAY UT
2009-05-28 385-221 0–9 XXXall 10 · 2 holders which blocks → QWEST CORPORATION 9636 PROVO UT
2009-04-23 385-322 0–9 XXXwhole prefix which blocks → FIRSTDIGITAL TELECOM, LLC - UT 5727 SALT LAKE UT
2009-04-20 385-234 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 SALT LAKE UT
2009-04-17 385-646 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 385-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT UT
— 385-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT UT
— 385-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT UT
— 385-415 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 385-435 not yet reported which blocks → UT
— 385-466 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
— 385-497 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
— 385-499 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 385-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT UT
— 385-535 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
— 385-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST 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.