Found 8 targets:

callsign		age	comment
W4HDJ B		356d 4h47m	70cm Voice (D-Star) 434.85000MHz +0.0000MHz
W4HDJ-B		356d 4h46m	70cm Voice (D-Star) 434.85000MHz +0.0000MHz
W4HDJ-D		358d 6h19m	70cm MMDVM Voice (DMR) 434.85000MHz +0.0000MHz, APRS for DMRGateway
W4HDJ A		352d 21h51m	70cm Voice (D-Star) 434.85000MHz +0.0000MHz
W4HDJ-A		352d 21h51m	70cm Voice (D-Star) 434.85000MHz +0.0000MHz
W4HDJ		11d 8h52m	HELLO
W4HDJ-10		184d 3h53m	https://aprsdroid.org/
W4HDJ-N		9d 23h46m	2m MMDVM Voice (NXDN) 144.95000MHz +0.0000MHz, W4HDJ_Pi-Star_ND

This page shows real-time information collected from the Automatic Position Reporting System Internet network (APRS-IS). APRS is used by amateur (ham) radio operators to transmit real-time position information, weather data, telemetry and messages over the radio. A vehicle equipped with a GPS receiver, a VHF transmitter or HF transceiver and a small computer device called a tracker transmits it's location, speed and course in a small data packet, which is then received by a nearby iGate receiving site which forwards the packet on the Internet. Systems connected to the Internet can send information on the APRS-IS without a radio transmitter, or collect and display information transmitted anywhere in the world.