Apparatus

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sensors Mode-S transponder

AE21DC

ICAO 24-bit transponder address

Currently assigned to 83-23662 · SIKORSKY UH-60 Black Hawk

Hex
AE21DC
Octal
53420734
Decimal
11,411,932
Tail
83-23662
Type
H60
No current signal · last broadcast Jul 24, 20:25 UTC
Flights observed
20
Distinct callsigns
1
Country
-
Last broadcast
Jul 24, 20:25 UTC

Last known position

Most recent position reported by Mode-S AE21DC.

Callsign history 1 distinct

Callsign Airline Flights Last seen
TSTR63 - 20 2026-07-24

Recent flights last 20

DateFlightRouteTakeoffLandingDuration
2026-07-24 TSTR63 - Jul 24, 18:35 UTCJul 24, 20:25 UTC1h 50m
2026-07-22 TSTR63 - Jul 22, 17:45 UTCJul 22, 19:45 UTC2h 0m
2026-07-22 TSTR63 LTW → NHK Jul 22, 13:45 UTCJul 22, 15:30 UTC1h 45m
2026-07-21 TSTR63 NHK → NHK Jul 21, 14:00 UTCJul 21, 15:05 UTC1h 5m
2026-07-20 TSTR63 NHK → NHK Jul 20, 14:00 UTCJul 20, 14:25 UTC25m
2026-07-20 TSTR63 NHK → NHK Jul 20, 12:30 UTCJul 20, 12:40 UTC10m
2026-07-10 TSTR63 - Jul 10, 13:30 UTCJul 10, 15:10 UTC1h 40m
2026-07-09 TSTR63 - Jul 9, 17:45 UTCJul 9, 19:00 UTC1h 15m
2026-07-02 TSTR63 - Jul 2, 14:20 UTCJul 2, 15:35 UTC1h 15m
2026-06-26 TSTR63 - Jun 26, 17:59 UTCJun 26, 19:20 UTC1h 20m
2026-06-22 TSTR63 - Jun 22, 19:14 UTCJun 22, 19:29 UTC15m
2026-06-22 TSTR63 - Jun 22, 13:05 UTCJun 22, 13:19 UTC15m
2026-06-15 TSTR63 - Jun 15, 14:15 UTCJun 15, 16:04 UTC1h 50m
2026-06-11 TSTR63 - Jun 11, 14:50 UTCJun 11, 15:15 UTC25m
2026-06-11 TSTR63 - Jun 11, 13:45 UTCJun 11, 14:05 UTC20m
2026-06-09 TSTR63 - Jun 9, 13:35 UTCJun 9, 14:20 UTC45m
2026-06-05 TSTR63 - Jun 5, 12:50 UTCJun 5, 13:40 UTC50m
2026-06-04 TSTR63 - Jun 4, 17:40 UTCJun 4, 18:00 UTC20m
2026-06-04 TSTR63 - Jun 4, 15:20 UTCJun 4, 16:00 UTC40m
2026-06-04 TSTR63 NHK → NHK Jun 4, 13:15 UTCJun 4, 14:00 UTC45m

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 83-23662 page for operator, model, and routing details .

Mode-S AE21DC frequently asked

What is Mode-S code AE21DC?
AE21DC is an ICAO 24-bit transponder address. Assigned to 83-23662.
Is AE21DC broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 20:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE21DC, octal 53420734, decimal 11,411,932.
What flights does AE21DC operate?
Mode-S AE21DC has broadcast 1 distinct callsign, including TSTR63.