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
KX4XC
Not currently held
· 1 holder on record
· available since Mar 1, 2022
Previous holder: Kostadinos G Vasilopoulos
Held KX4XC Feb 10, 2020 → Feb 29, 2020
· first licensed Feb 10, 2020 as KX4XC
· 5 licenses · FRN 0029208188
W4DS
Active
Amateur Extra · vanity
Jun 6, 2025 → expires Jun 6, 2035
Licensee Kostadinos G Vasilopoulos
Address Attn: kostadinos vasilopoulos PO Box 33647 10264 Estuary Dr Tampa, FL 33647
28.1324, -82.3126 (street) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
FRN 0029208188
Previous call N4BJ
Last granted Jun 6, 2025
Effective Jun 13, 2025
Last action Jun 13, 2025
FCC actions (3)
Jun 13, 2025 — FCC action LIAUA Jun 6, 2025 — Vanity call sign granted VANGRT Jun 6, 2025 — License issued LIISS
N4BJ
Canceled
Amateur Extra · vanity
Jun 11, 2021 → Jun 6, 2025 (canceled)
Licensee Kostadinos G Vasilopoulos
Address 17929 Timber View St Tampa, FL 33647
28.1519, -82.3182 (ZIP center) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
FRN 0029208188
Previous call WV4A
Last granted Jun 11, 2021
Effective Jun 11, 2021
Last action Jun 6, 2025
FCC actions (3)
Jun 6, 2025 — License canceled LICAN Jun 11, 2021 — Vanity call sign granted VANGRT Jun 11, 2021 — License issued LIISS
WV4A
Canceled
Amateur Extra · vanity
Mar 13, 2021 → Jun 11, 2021 (canceled)
Licensee Kostadinos G Vasilopoulos
Address 17929 Timber View St Tampa, FL 33647
28.1519, -82.3182 (ZIP center) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
FRN 0029208188
Previous call KV4SA
Last granted Mar 13, 2021
Effective Mar 13, 2021
Last action Jun 11, 2021
FCC actions (3)
Jun 11, 2021 — License canceled LICAN Mar 13, 2021 — Vanity call sign granted VANGRT Mar 13, 2021 — License issued LIISS
KV4SA
Canceled
Amateur Extra · vanity
Feb 29, 2020 → Mar 13, 2021 (canceled)
Licensee Kostadinos G Vasilopoulos
Address 17929 Timber View St Tampa, FL 33647
28.1519, -82.3182 (ZIP center) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
FRN 0029208188
Previous call KX4XC
Last granted Feb 29, 2020
Effective Feb 29, 2020
Last action Mar 13, 2021
FCC actions (3)
Mar 13, 2021 — License canceled LICAN Feb 29, 2020 — Vanity call sign granted VANGRT Feb 29, 2020 — License issued LIISS
KX4XC
Canceled
Amateur Extra
Feb 10, 2020 → Feb 29, 2020 (canceled)
Licensee Konstadinos G Vasilopoulos
Address 17929 Timber View St Tampa, FL 33647
28.1519, -82.3182 (ZIP center) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
FRN 0029208188
Last granted Feb 10, 2020
Effective Feb 10, 2020
Last action Feb 29, 2020
FCC actions (3)
Feb 29, 2020 — License canceled LICAN Feb 10, 2020 — License issued LIISS Feb 10, 2020 — 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 → Sep 27, 2026 · 2 snapshots · as W4DS
Kostadinos G Vasilopoulos
Attn: kostadinos vasilopoulos PO Box 33647 10264 Estuary Dr, Tampa, FL 33647
28.1324, -82.3126 (street) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
Seen Apr 16, 2022 → Sep 27, 2026 · 12 snapshots · as KX4XC
Konstadinos G Vasilopoulos
17929 Timber View St, Tampa, FL 33647
28.1519, -82.3182 (ZIP center) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
Seen Apr 16, 2022 → Sep 27, 2026 · 36 snapshots · as KV4SA
Kostadinos G Vasilopoulos
17929 Timber View St, Tampa, FL 33647
28.1519, -82.3182 (ZIP center) · Grid
EL88ud · CQ 5 · ITU 8 ·
map ↗
Data: FCC Universal Licensing System, amateur service · refreshed nightly
n9tpb.com · 73 de N9TPB