NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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 475
ONVOY, LLC - CT 2
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
2021-10-05 475-308 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2021-09-29 475-315 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F CHESHIRE CT
2021-09-27 475-291 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2021-09-27 475-296 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2021-09-27 475-297 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F NEWTOWN CT
2021-09-09 475-309 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-08-31 475-290 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2021-08-12 475-305 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2021-07-21 475-294 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CT 639C MILFORD CT
2021-07-16 475-287 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2021-07-02 475-276 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT
2021-06-24 475-293 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CT 639C WALLINGFD CT
2021-06-23 475-286 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H BRANFORD CT
2021-04-27 475-295 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
2021-03-26 475-280 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-03-23 475-447 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H BYRAM CT
2021-02-28 475-278 0–9 XXXall 10 · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 GREENWICH CT
2021-02-16 475-260 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H HUNTINGTON CT
2021-02-12 475-410 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H WOODBURY CT
2021-02-04 475-474 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CT 639C TRUMBULL CT
2020-12-07 475-281 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2020-10-30 475-312 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2020-10-29 475-837 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NEW HAVEN CT
2020-10-26 475-454 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CT 639C DANBURY CT
2020-09-18 475-284 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J BRIDGEPORT CT
2020-09-03 475-303 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J GREENWICH CT
2020-07-22 475-377 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H WATERBURY CT
2020-07-22 475-755 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H NORWALK CT
2020-07-22 475-758 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H NEW CANAAN CT
2020-07-22 475-766 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H NEW HAVEN CT
2020-07-22 475-877 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H REDDING CT
2020-07-22 475-977 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H STAMFORD CT
2020-07-21 475-336 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H DARIEN CT
2020-07-21 475-345 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BRIDGEPORT CT
2020-07-21 475-455 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ANSONIDRBY CT
2020-07-21 475-688 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MERIDEN CT
2020-07-21 475-946 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H OLDGRNWICH CT
2020-07-15 475-274 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F GUILFORD CT
2020-07-15 475-285 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F NAUGATUCK CT
2020-06-22 475-273 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F BRIDGEPORT CT
2020-06-12 475-271 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CT 639C MILFORD CT
2020-06-11 475-445 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CT 639C NEWTOWN CT
2020-06-11 475-501 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CT 639C GEORGETOWN CT
2020-06-03 475-272 0–9 XXXall 10 · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 FAIRFIELD CT
2020-05-28 475-270 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CT 639C WALLINGFD CT
2020-05-28 475-405 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CT 639C CHESHIRE CT
2020-05-13 475-575 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CT 639C RIDGEFIELD CT
2020-03-27 475-267 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2020-03-18 475-348 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2020-02-13 475-268 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT

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.