Apparatus

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sensors Mode-S transponder

3F77EF

ICAO 24-bit transponder address · allocated to Germany

Hex
3F77EF
Octal
17673757
Decimal
4,159,471
Country
DE
No current signal · last broadcast 20d ago
Flights observed
40
Distinct callsigns
13
Country
DE
Last broadcast
20d ago

Last known position

Most recent position reported by Mode-S 3F77EF.

Country allocation

The ICAO 24-bit address 3F77EF falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 13 distinct

Callsign Airline Flights Last seen
RESQ63 - 8 2026-06-16
JOKER53 - 5 2026-06-25
JOKER31 - 5 2026-06-23
JOKER82 - 4 2026-06-30
JOKER68 - 4 2026-06-25
GAM12S - 4 2026-06-11
JOKER50 - 3 2026-06-25
JOKER35 - 2 2026-06-03
JOKER81 - 1 2026-06-30
JOKER57 - 1 2026-06-18
JOKER44 - 1 2026-06-18
JOKER36 - 1 2026-06-26
JOKER11 - 1 2026-06-18

Recent flights last 40

DateFlightRouteTakeoffLandingDuration
2026-06-30 JOKER81 - Jun 30, 12:05 UTCJun 30, 14:00 UTC1h 55m
2026-06-30 JOKER82 - Jun 30, 07:30 UTCJun 30, 09:30 UTC2h 0m
2026-06-29 JOKER82 - Jun 29, 10:04 UTCJun 29, 11:45 UTC1h 40m
2026-06-26 JOKER36 - Jun 26, 06:15 UTCJun 26, 08:15 UTC2h 0m
2026-06-25 JOKER50 - Jun 25, 12:15 UTCJun 25, 13:45 UTC1h 30m
2026-06-25 JOKER53 - Jun 25, 10:20 UTCJun 25, 11:30 UTC1h 10m
2026-06-25 JOKER68 - Jun 25, 07:49 UTCJun 25, 08:55 UTC1h 5m
2026-06-25 JOKER68 - Jun 25, 07:25 UTCJun 25, 07:45 UTC20m
2026-06-24 JOKER53 - Jun 24, 12:40 UTCJun 24, 12:54 UTC15m
2026-06-24 JOKER68 - Jun 24, 09:49 UTCJun 24, 11:14 UTC1h 25m
2026-06-24 JOKER50 - Jun 24, 07:10 UTCJun 24, 08:35 UTC1h 25m
2026-06-23 JOKER31 - Jun 23, 13:19 UTCJun 23, 14:44 UTC1h 25m
2026-06-23 JOKER31 - Jun 23, 11:19 UTCJun 23, 12:55 UTC1h 35m
2026-06-23 JOKER31 - Jun 23, 08:54 UTCJun 23, 10:10 UTC1h 15m
2026-06-23 JOKER31 - Jun 23, 08:25 UTCJun 23, 08:50 UTC25m
2026-06-23 JOKER31 - Jun 23, 06:04 UTCJun 23, 07:40 UTC1h 35m
2026-06-22 JOKER68 - Jun 22, 12:05 UTCJun 22, 13:59 UTC1h 55m
2026-06-22 JOKER82 - Jun 22, 09:00 UTCJun 22, 09:10 UTC10m
2026-06-22 JOKER82 - Jun 22, 07:40 UTCJun 22, 08:54 UTC1h 15m
2026-06-19 JOKER53 - Jun 19, 07:29 UTCJun 19, 09:24 UTC1h 55m
2026-06-18 JOKER11 - Jun 18, 20:15 UTCJun 18, 22:20 UTC2h 5m
2026-06-18 JOKER57 - Jun 18, 16:25 UTCJun 18, 17:35 UTC1h 10m
2026-06-18 JOKER44 - Jun 18, 13:05 UTCJun 18, 15:05 UTC2h 0m
2026-06-17 JOKER53 - Jun 17, 21:55 UTCJun 17, 22:10 UTC15m
2026-06-17 JOKER53 - Jun 17, 20:30 UTCJun 17, 21:20 UTC50m
2026-06-17 JOKER50 - Jun 17, 15:40 UTCJun 17, 17:20 UTC1h 40m
2026-06-16 RESQ63 - Jun 16, 13:34 UTCJun 16, 14:15 UTC40m
2026-06-16 RESQ63 - Jun 16, 11:45 UTCJun 16, 13:00 UTC1h 15m
2026-06-16 RESQ63 - Jun 16, 08:15 UTCJun 16, 09:34 UTC1h 20m
2026-06-16 RESQ63 - Jun 16, 07:25 UTCJun 16, 08:00 UTC35m
2026-06-11 GAM12S - Jun 11, 13:55 UTCJun 11, 16:40 UTC2h 45m
2026-06-11 GAM12S - Jun 11, 13:00 UTCJun 11, 13:15 UTC15m
2026-06-11 GAM12S - Jun 11, 12:30 UTCJun 11, 12:55 UTC25m
2026-06-11 GAM12S - Jun 11, 10:35 UTCJun 11, 12:25 UTC1h 50m
2026-06-07 RESQ63 - Jun 7, 08:35 UTCJun 7, 09:45 UTC1h 10m
2026-06-07 RESQ63 - Jun 7, 06:25 UTCJun 7, 07:50 UTC1h 25m
2026-06-05 RESQ63 - Jun 5, 10:00 UTCJun 5, 11:10 UTC1h 10m
2026-06-05 RESQ63 - Jun 5, 07:35 UTCJun 5, 09:25 UTC1h 50m
2026-06-03 JOKER35 - Jun 3, 07:35 UTCJun 3, 09:50 UTC2h 15m
2026-06-02 JOKER35 - Jun 2, 08:20 UTCJun 2, 10:15 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.

Mode-S 3F77EF frequently asked

What is Mode-S code 3F77EF?
3F77EF is an ICAO 24-bit transponder address. Allocated to Germany.
Where is Mode-S 3F77EF registered?
Mode-S code 3F77EF is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3F77EF broadcasting right now?
No active broadcast right now. Last signal was 20d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3F77EF, octal 17673757, decimal 4,159,471.
What flights does 3F77EF operate?
Mode-S 3F77EF has broadcast 13 distinct callsigns, including RESQ63, JOKER53, JOKER31, JOKER82, JOKER68.