N9TPB
FCC License Search
🕒 FCC license data updated yesterday 9:45 am CDT · next update today 6:00 am CDT
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HAMs within 5 miles of N9TPB · Extra class operators in Madison, WI · or try N9TPB · K9* wildcards · Smith, John · 0004797601 (FRN) · 53703 · Madison, WIK4UDP HAM
✅ Available for a vanity request — free since Oct 6, 2024.
1x3 call: Technician, General, Advanced and Amateur Extra licensees can request it.
No pending applications list it.
📬 QSL: no LoTW uploads on record · not eQSL AG · QRZ · HamQTH
Not currently held · 1 holder on record · available since Oct 6, 2024
Previous holder: Kristjan K Treftz
Held K4UDP Oct 5, 2012 → Oct 5, 2022 · first licensed Nov 17, 2009 as KJ4QMY · 2 licenses · FRN 0019308923
-
- Licensee
- Kristjan K Treftz
- Address
- 3840 Laguna Loop
Hernando, FL 34442
- FRN
- 0019308923
- Previous call
- KJ4QMY (Technician)
- Last granted
- Oct 5, 2012
- Effective
- Oct 5, 2012
- Last action
- Oct 8, 2024
FCC actions (3)
- Oct 8, 2024 — License expired LIEXP
- Oct 5, 2012 — Vanity call sign granted VANGRT
- Oct 5, 2012 — License issued LIISS
-
- Licensee
- Kristjan K Treftz
- Address
- 3840 Laguna Loop
Hernando, FL 34442
- FRN
- 0019308923
- Last granted
- Nov 17, 2009
- Effective
- Nov 17, 2010
- Last action
- Oct 5, 2012
FCC actions (4)
- Oct 5, 2012 — License canceled LICAN
- Nov 17, 2010 — License modified LIMOD
- Nov 17, 2009 — License issued LIISS
- Nov 17, 2009 — 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 May 27, 2010 → Oct 4, 2026 · 89 snapshots · as KJ4QMY
Kristjan K Treftz
3840 Laguna Loop, Hernando, FL 34442
Others requesting K4UDP
3 applications listed K4UDP as a choice, newest first.
| Filed | Award | Applicant | Choice # | Status |
|---|---|---|---|---|
| Dec 15, 2025 | Jan 2, 2026 | KR4IAN · Patrick L Wood · BOWLING GREEN, KY | 4 | Granted |
| Dec 1, 2025 | Dec 19, 2025 | KF7YYT · Alex Teiche · Bainbridge Island, WA | 9 | Granted |
| Sep 17, 2012 | Oct 5, 2012 | KJ4QMY · Kristjan K Treftz · Hernando, FL | 1 | Granted |
📡 On the air: APRS, digital & WSPR spots
No APRS positions, PSK Reporter reports or WSPR spots for K4UDP in the last 24 hours. They show up here within seconds of K4UDP beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.