Apparatus

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sensors Mode-S transponder

AE4873

ICAO 24-bit transponder address

Hex
AE4873
Octal
53444163
Decimal
11,421,811
No current signal · last broadcast 16h ago
Flights observed
4
Distinct callsigns
1
Country
-
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S AE4873.

Callsign history 1 distinct

Callsign Airline Flights Last seen
PAT61 - 4 2026-05-29

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-05-29 PAT61 DAA → DAA May 29, 17:55 UTCMay 29, 18:25 UTC30m
2026-05-29 PAT61 DAA → DAA May 29, 16:20 UTCMay 29, 16:40 UTC20m
2026-05-29 PAT61 - May 29, 13:55 UTCMay 29, 14:15 UTC20m
2026-05-28 PAT61 - May 28, 15:55 UTCMay 28, 16:55 UTC1h 0m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Mode-S AE4873 frequently asked

What is Mode-S code AE4873?
AE4873 is an ICAO 24-bit transponder address.
Is AE4873 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE4873, octal 53444163, decimal 11,421,811.
What flights does AE4873 operate?
Mode-S AE4873 has broadcast 1 distinct callsign, including PAT61.