N9TPB
FCC License Search
🕒 FCC license data updated today 7:15 am CDT (FCC files through Oct 4, 2026) · next update tomorrow 6:00 am CDT
Ask:
HAMs within 5 miles of N9TPB · Extra class operators in Madison, WI · or try N9TPB · K9* wildcards · Smith, John · 0004797601 (FRN) · 53703 · Madison, WIKJ4YKO HAM
✅ Available for a vanity request — free since Apr 27, 2013.
2x3 call: any licensee can request it.
No pending applications list it.
📬 QSL: LoTW user · last upload May 7, 2011 · eQSL AG member · QRZ · HamQTH
Not currently held · 1 holder on record · available since Apr 27, 2013
Previous holder: Derek T Brown
Held KJ4YKO Sep 16, 2010 → Apr 26, 2011 · first licensed Sep 16, 2010 as KJ4YKO · 2 licenses · FRN 0020198008
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📦 Moved: Chapel Hill, NC → Seattle, WA
- Licensee
- Derek T Brown
- Address
- 402 Prospect St
Seattle, WA 98109
- FRN
- 0020198008
- Previous call
- KJ4YKO (General)
- Last granted
- Jan 28, 2021
- Effective
- Jun 17, 2025
- Last action
- Jun 17, 2025
FCC actions (6)
- Jun 17, 2025 — Administrative update LIAUA
- May 9, 2023 — Administrative update LIAUA
- Jan 28, 2021 — License renewed LIREN
- Jan 26, 2021 — Administrative update LIAUA
- Apr 26, 2011 — Vanity call sign granted VANGRT
- Apr 26, 2011 — License issued LIISS
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- Licensee
- Derek T Brown
- Address
- 104 Beechridge Ct
Chapel Hill, NC 27517
- FRN
- 0020198008
- Last granted
- Sep 16, 2010
- Effective
- Mar 18, 2011
- Last action
- Apr 26, 2011
FCC actions (5)
- Apr 26, 2011 — License canceled LICAN
- Mar 18, 2011 — License modified LIMOD
- Nov 17, 2010 — License modified LIMOD
- Sep 16, 2010 — License issued LIISS
- Sep 16, 2010 — Systematic call sign granted SYSGRT
Address history
From FCC database snapshots (2004 → now). "Seen" dates are the first and last snapshot showing that address.
- Seen Sep 25, 2025 → Oct 4, 2026 · 3 snapshots · as W4DTB
Derek T Brown
402 Prospect St, Seattle, WA 98109 - Seen Oct 17, 2011 → Oct 4, 2026 · 79 snapshots · as KJ4YKO
Derek T Brown
104 Beechridge Ct, Chapel Hill, NC 27517 - Seen Apr 27, 2024 → May 29, 2025 · 9 snapshots · as W4DTB
Derek T Brown
800 High School Way, Apt 110, Mountain View, CA 94041 - Seen Apr 16, 2022 · 1 snapshot · as W4DTB
Derek T Brown
920 5th Ave N, Unit 6, Seattle, WA 98109
📡 On the air: APRS, digital & WSPR spots
No APRS positions, PSK Reporter reports or WSPR spots for KJ4YKO in the last 24 hours. They show up here within seconds of KJ4YKO beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.