Apparatus

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sensors Mode-S transponder

AFCA1F

ICAO 24-bit transponder address

Currently assigned to 24-21307 · SIKORSKY UH-60 Black Hawk

Hex
AFCA1F
Octal
53745037
Decimal
11,520,543
Tail
24-21307
Type
H60
No current signal · last broadcast Jul 22, 22:00 UTC
Flights observed
13
Distinct callsigns
4
Country
-
Last broadcast
Jul 22, 22:00 UTC

Last known position

Most recent position reported by Mode-S AFCA1F.

Callsign history 4 distinct

Callsign Airline Flights Last seen
HOPE36 - 5 2026-06-07
HOPE20 - 5 2026-07-22
HOPE46 - 2 2026-07-17
HOPE25 - 1 2026-07-16

Recent flights last 13

DateFlightRouteTakeoffLandingDuration
2026-07-22 HOPE20 NCO → NCO Jul 22, 21:30 UTCJul 22, 22:00 UTC30m
2026-07-17 HOPE46 - Jul 17, 00:40 UTCJul 17, 01:35 UTC55m
2026-07-16 HOPE46 - Jul 16, 21:25 UTCJul 16, 22:40 UTC1h 15m
2026-07-16 HOPE25 - Jul 16, 00:35 UTCJul 16, 01:55 UTC1h 20m
2026-07-10 HOPE20 - Jul 10, 01:40 UTCJul 10, 02:15 UTC35m
2026-06-07 HOPE36 - Jun 7, 20:05 UTCJun 7, 20:35 UTC30m
2026-06-07 HOPE36 - Jun 7, 16:35 UTCJun 7, 18:15 UTC1h 40m
2026-06-05 HOPE36 - Jun 5, 18:40 UTCJun 5, 19:35 UTC55m
2026-06-03 HOPE36 - Jun 3, 15:25 UTCJun 3, 15:45 UTC20m
2026-05-27 HOPE36 - May 27, 19:55 UTCMay 27, 20:20 UTC25m
2026-05-01 HOPE20 - May 1, 01:30 UTCMay 1, 02:35 UTC1h 5m
2026-04-30 HOPE20 - Apr 30, 23:10 UTCApr 30, 23:45 UTC35m
2026-04-14 HOPE20 - Apr 14, 17:40 UTCApr 14, 18:30 UTC50m

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 24-21307 page for operator, model, and routing details .

Mode-S AFCA1F frequently asked

What is Mode-S code AFCA1F?
AFCA1F is an ICAO 24-bit transponder address. Assigned to 24-21307.
Is AFCA1F broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AFCA1F, octal 53745037, decimal 11,520,543.
What flights does AFCA1F operate?
Mode-S AFCA1F has broadcast 4 distinct callsigns, including HOPE36, HOPE20, HOPE46, HOPE25.