N9TPB FCC License Search

🕒 FCC license data updated today 7:15 am CDT (FCC files through Oct 5, 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, WI

N4ISD HAM

✅ Available for a vanity request — free since Apr 28, 2011.

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 Apr 28, 2011

Previous holder: David U O'Kain

Held N4ISD Apr 27, 1999 → Apr 27, 2009 · first licensed Apr 27, 1999 as N4ISD · 1 license · FRN 0012184495

N4ISD Expired General Apr 27, 1999 → Apr 27, 2009 (expired)

Licensee
David U O'Kain

Address
2660 Oak Ridge Trnpke
Oak Ridge, TN 37830
35.9665, -84.2905 (ZIP center) · Grid EM75ux · CQ 4 · ITU 8 · map ↗

FRN
0012184495

Last granted
Apr 27, 1999

Effective
Nov 22, 2004

Last action
Apr 28, 2011
FCC actions (3)
- Apr 28, 2011 — License expired LIEXP
- Nov 22, 2004 — License modified LIMOD
- Nov 22, 2004 — FCC action LITIN

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 · 47 snapshots · as N4ISD
David U O'Kain
2660 Oak Ridge Trnpke, Oak Ridge, TN 37830
35.9665, -84.2905 (ZIP center) · Grid EM75ux · CQ 4 · ITU 8 · map ↗
Seen Nov 7, 2004 · 1 snapshot · as N4ISD
DAVID U O KAIN
2660 OAK RIDGE TRNPKE, OAK RIDGE, TN 37830
35.9665, -84.2905 (ZIP center) · Grid EM75ux · CQ 4 · ITU 8 · map ↗

📡 On the air: APRS, digital & WSPR spots

No APRS positions, PSK Reporter reports or WSPR spots for N4ISD in the last 24 hours. They show up here within seconds of N4ISD beaconing on APRS, being heard on FT8, FT4 and other digital modes, or sending a WSPR beacon.