Apparatus

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sensors Mode-S transponder

AE51AA

ICAO 24-bit transponder address

Currently assigned to 11-20358 · SIKORSKY UH-60 Black Hawk

Hex
AE51AA
Octal
53450652
Decimal
11,424,170
Tail
11-20358
Type
H60
No current signal · last broadcast 22h ago
Flights observed
26
Distinct callsigns
8
Country
-
Last broadcast
22h ago

Last known position

Most recent position reported by Mode-S AE51AA.

Callsign history 8 distinct

Callsign Airline Flights Last seen
SPADE33 - 7 2026-06-11
DUKE11 - 4 2026-06-03
SPADE22 - 3 2026-07-17
SPADE10 - 3 2026-06-08
SPADE08 - 3 2026-06-09
SPADE12 - 2 2026-07-07
HAZE07 - 2 2026-04-13
HAZE22 - 1 2026-04-29

Recent flights last 26

DateFlightRouteTakeoffLandingDuration
2026-07-17 SPADE22 - Jul 17, 11:10 UTCJul 17, 12:15 UTC1h 5m
2026-07-16 SPADE22 - Jul 16, 15:14 UTCJul 16, 16:00 UTC45m
2026-07-16 SPADE22 - Jul 16, 11:54 UTCJul 16, 13:54 UTC2h 0m
2026-07-07 SPADE12 WIE → WIE Jul 7, 12:20 UTCJul 7, 12:25 UTC5m
2026-07-07 SPADE12 WIE → WIE Jul 7, 11:40 UTCJul 7, 12:15 UTC35m
2026-06-11 SPADE33 - Jun 11, 14:55 UTCJun 11, 15:25 UTC30m
2026-06-11 SPADE33 - Jun 11, 13:50 UTCJun 11, 14:20 UTC30m
2026-06-11 SPADE33 WIE → WIE Jun 11, 13:30 UTCJun 11, 13:45 UTC15m
2026-06-11 SPADE33 - Jun 11, 11:15 UTCJun 11, 12:15 UTC1h 0m
2026-06-11 SPADE33 WIE → WIE Jun 11, 10:55 UTCJun 11, 11:10 UTC15m
2026-06-11 SPADE33 WIE → WIE Jun 11, 10:30 UTCJun 11, 10:50 UTC20m
2026-06-11 SPADE33 WIE → WIE Jun 11, 10:20 UTCJun 11, 10:25 UTC5m
2026-06-09 SPADE08 WIE → WIE Jun 9, 21:40 UTCJun 9, 22:15 UTC35m
2026-06-09 SPADE08 WIE → WIE Jun 9, 21:00 UTCJun 9, 21:35 UTC35m
2026-06-09 SPADE08 WIE → WIE Jun 9, 17:15 UTCJun 9, 18:45 UTC1h 30m
2026-06-08 SPADE10 - Jun 8, 11:40 UTCJun 8, 12:30 UTC50m
2026-06-08 SPADE10 WIE → RMS Jun 8, 08:00 UTCJun 8, 08:40 UTC40m
2026-06-08 SPADE10 WIE → WIE Jun 8, 07:50 UTCJun 8, 07:55 UTC5m
2026-06-03 DUKE11 - Jun 3, 17:15 UTCJun 3, 18:10 UTC55m
2026-06-03 DUKE11 - Jun 3, 15:25 UTCJun 3, 16:10 UTC45m
2026-06-03 DUKE11 - Jun 3, 14:40 UTCJun 3, 15:15 UTC35m
2026-06-03 DUKE11 WIE → WIE Jun 3, 14:25 UTCJun 3, 14:30 UTC5m
2026-04-29 HAZE22 ILH → ILH Apr 29, 09:10 UTCApr 29, 09:35 UTC25m
2026-04-13 - - Apr 13, 21:30 UTCApr 13, 21:45 UTC15m
2026-04-13 HAZE07 - Apr 13, 20:25 UTCApr 13, 20:35 UTC10m
2026-04-13 HAZE07 - Apr 13, 17:50 UTCApr 13, 19:45 UTC1h 55m

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 11-20358 page for operator, model, and routing details .

Mode-S AE51AA frequently asked

What is Mode-S code AE51AA?
AE51AA is an ICAO 24-bit transponder address. Assigned to 11-20358.
Is AE51AA broadcasting right now?
No active broadcast right now. Last signal was 22h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AE51AA, octal 53450652, decimal 11,424,170.
What flights does AE51AA operate?
Mode-S AE51AA has broadcast 8 distinct callsigns, including SPADE33, DUKE11, SPADE22, SPADE10, SPADE08.