Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AED549

ICAO 24-bit transponder address

Hex
AED549
Octal
53552511
Decimal
11,457,865
No current signal · last broadcast Jun 12, 19:15 UTC
Flights observed
2
Distinct callsigns
2
Country
-
Last broadcast
Jun 12, 19:15 UTC

Last known position

Most recent position reported by Mode-S AED549.

Callsign history 2 distinct

Callsign Airline Flights Last seen
MAINT24 - 1 2026-06-12
MAINT13 - 1 2026-05-12

Recent flights last 2

DateFlightRouteTakeoffLandingDuration
2026-06-12 MAINT24 - Jun 12, 18:05 UTCJun 12, 19:15 UTC1h 10m
2026-05-12 MAINT13 - May 12, 16:45 UTCMay 12, 18:30 UTC1h 45m

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 AED549 frequently asked

What is Mode-S code AED549?
AED549 is an ICAO 24-bit transponder address.
Is AED549 broadcasting right now?
No active broadcast right now. Last signal was Jun 12, 19:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AED549, octal 53552511, decimal 11,457,865.
What flights does AED549 operate?
Mode-S AED549 has broadcast 2 distinct callsigns, including MAINT24, MAINT13.