N9TPB FCC License Search
🕒 FCC license data updated today 7:15 am CDT (FCC files through Oct 8, 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 · old CB calls like KHC1939 or 18Q3518 (1962–63 CB call books) · (205) 546-1767 (1990s CB directory phones)

KO4EO HAM

✅ Available for a vanity request — KO4EO was last held in the 1990s (license expired Jul 9, 2001), before the FCC's online records begin, so the two-year wait is long over. Confirm in the FCC's vanity system before applying.
2x2 call: Advanced and Amateur Extra licensees can request it. No pending applications list it.

Not in the FCC's online records (1999 → now), but held before then: see below.

Held Before 1999

KO4EO in the 1993–2003 Callbooks
From the FCC amateur database as published on the QRZ! callsign CD-ROMs, 1993–2003, before and alongside the FCC's online records (which start in 1999). "Seen" dates are the first and last disc showing that record; the issue date is the FCC's, so it can be a renewal of an even older license.
KO4EO in the Printed Callbooks, 1909–1997
From scanned copies of the printed callbooks (government lists from 1913, then the Radio Amateur Callbook to 1997), read by OCR, so names and streets can carry typos. Each line is one or more editions in a row showing the same name at the same address.