Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AE5A23

ICAO 24-bit transponder address

Currently assigned to 17-08232 · BOEING-VERTOL CH-47 Chinook

Hex
AE5A23
Octal
53455043
Decimal
11,426,339
Tail
17-08232
Type
H47
No current signal · last broadcast 19h ago
Flights observed
3
Distinct callsigns
1
Country
-
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S AE5A23.

Callsign history 1 distinct

Callsign Airline Flights Last seen
URSA19 - 3 2026-04-14

Recent flights last 3

DateFlightRouteTakeoffLandingDuration
2026-04-14 URSA19 - Apr 14, 10:00 UTCApr 14, 10:45 UTC45m
2026-04-14 URSA19 - Apr 14, 08:35 UTCApr 14, 08:55 UTC20m
2026-04-14 URSA19 FBK → FBK Apr 14, 08:05 UTCApr 14, 08:10 UTC5m

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.

Prefer a tail-number view? See the 17-08232 page for operator, model, and routing details .

Mode-S AE5A23 frequently asked

What is Mode-S code AE5A23?
AE5A23 is an ICAO 24-bit transponder address. Assigned to 17-08232.
Is AE5A23 broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE5A23, octal 53455043, decimal 11,426,339.
What flights does AE5A23 operate?
Mode-S AE5A23 has broadcast 1 distinct callsign, including URSA19.