Apparatus

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sensors Mode-S transponder

4C3C84

ICAO 24-bit transponder address · allocated to Serbia

Currently assigned to YU-PEE · EMBRAER ERJ-145

Hex
4C3C84
Octal
23036204
Decimal
4,996,228
Country
RS
Tail
YU-PEE
Type
E145
No current signal · last broadcast Jul 26, 15:50 UTC
Flights observed
139
Distinct callsigns
1
Country
RS
Last broadcast
Jul 26, 15:50 UTC

Last known position

Most recent position reported by Mode-S 4C3C84.

Country allocation

The ICAO 24-bit address 4C3C84 falls within the block assigned to Serbia (RS) by ICAO Annex 10, Volume III. Every aircraft registered in Serbia 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 1 distinct

Callsign Airline Flights Last seen
FUU121E - 139 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FUU121E - Jul 26, 13:10 UTCJul 26, 15:50 UTC2h 40m
2026-07-25 FUU121E - Jul 25, 16:20 UTCJul 25, 17:30 UTC1h 10m
2026-07-25 FUU121E - Jul 25, 13:05 UTCJul 25, 15:25 UTC2h 20m
2026-07-25 FUU121E - Jul 25, 09:00 UTCJul 25, 11:45 UTC2h 45m
2026-07-24 FUU121E - Jul 24, 10:35 UTCJul 24, 13:40 UTC3h 5m
2026-07-24 FUU121E - Jul 24, 06:15 UTCJul 24, 07:10 UTC55m
2026-07-24 FUU121E - Jul 24, 04:05 UTCJul 24, 04:50 UTC45m
2026-07-23 FUU121E - Jul 23, 17:50 UTCJul 23, 19:05 UTC1h 15m
2026-07-23 FUU121E - Jul 23, 14:25 UTCJul 23, 17:10 UTC2h 45m
2026-07-23 FUU121E - Jul 23, 11:10 UTCJul 23, 12:25 UTC1h 15m
2026-07-21 FUU121E BEG → NCE Jul 21, 13:40 UTCJul 21, 15:40 UTC2h 0m
2026-07-20 FUU121E - Jul 20, 13:05 UTCJul 20, 15:20 UTC2h 15m
2026-07-20 FUU121E - Jul 20, 11:00 UTCJul 20, 12:20 UTC1h 20m
2026-07-20 FUU121E - Jul 20, 08:00 UTCJul 20, 09:20 UTC1h 20m
2026-07-19 FUU121E - Jul 19, 08:10 UTCJul 19, 10:25 UTC2h 15m
2026-07-19 FUU121E - Jul 19, 07:05 UTCJul 19, 07:25 UTC20m
2026-07-18 FUU121E - Jul 18, 14:35 UTCJul 18, 16:40 UTC2h 5m
2026-07-18 FUU121E - Jul 18, 12:10 UTCJul 18, 13:00 UTC50m
2026-07-18 FUU121E - Jul 18, 09:30 UTCJul 18, 11:05 UTC1h 35m
2026-07-17 FUU121E - Jul 17, 13:20 UTCJul 17, 14:10 UTC50m
2026-07-17 FUU121E IBZ → NCE Jul 17, 11:04 UTCJul 17, 12:19 UTC1h 15m
2026-07-17 FUU121E - Jul 17, 06:45 UTCJul 17, 09:35 UTC2h 50m
2026-07-16 FUU121E - Jul 16, 14:05 UTCJul 16, 14:55 UTC50m
2026-07-16 FUU121E - Jul 16, 11:15 UTCJul 16, 13:10 UTC1h 55m
2026-07-15 FUU121E - Jul 15, 15:15 UTCJul 15, 16:00 UTC45m
2026-07-15 FUU121E - Jul 15, 12:35 UTCJul 15, 14:20 UTC1h 45m
2026-07-15 FUU121E BRU → BQH Jul 15, 10:10 UTCJul 15, 11:00 UTC50m
2026-07-14 FUU121E - Jul 14, 13:10 UTCJul 14, 15:25 UTC2h 15m
2026-07-12 FUU121E - Jul 12, 14:45 UTCJul 12, 16:01 UTC1h 15m
2026-07-12 FUU121E - Jul 12, 11:45 UTCJul 12, 13:50 UTC2h 5m
2026-07-12 FUU121E - Jul 12, 08:35 UTCJul 12, 09:55 UTC1h 20m
2026-07-11 FUU121E - Jul 11, 17:15 UTCJul 11, 17:50 UTC35m
2026-07-11 FUU121E - Jul 11, 08:30 UTCJul 11, 09:55 UTC1h 25m
2026-07-10 FUU121E - Jul 10, 13:50 UTCJul 10, 15:35 UTC1h 45m
2026-07-10 FUU121E - Jul 10, 11:20 UTCJul 10, 12:40 UTC1h 20m
2026-07-09 FUU121E - Jul 9, 14:40 UTCJul 9, 15:55 UTC1h 15m
2026-07-09 FUU121E - Jul 9, 12:35 UTCJul 9, 13:25 UTC50m
2026-07-09 FUU121E - Jul 9, 10:10 UTCJul 9, 11:10 UTC1h 0m
2026-07-07 FUU121E BRU → TPS Jul 7, 10:25 UTCJul 7, 12:35 UTC2h 10m
2026-07-07 FUU121E - Jul 7, 07:40 UTCJul 7, 09:15 UTC1h 35m
2026-07-06 FUU121E - Jul 6, 11:50 UTCJul 6, 13:45 UTC1h 55m
2026-07-06 FUU121E BEG → DBV Jul 6, 10:05 UTCJul 6, 10:45 UTC40m
2026-07-06 FUU121E - Jul 6, 08:10 UTCJul 6, 08:50 UTC40m
2026-07-06 FUU121E - Jul 6, 06:10 UTCJul 6, 06:55 UTC45m
2026-07-05 FUU121E - Jul 5, 12:30 UTCJul 5, 14:00 UTC1h 30m
2026-07-05 FUU121E - Jul 5, 11:10 UTCJul 5, 11:35 UTC25m
2026-07-05 FUU121E - Jul 5, 08:25 UTCJul 5, 09:55 UTC1h 30m
2026-07-05 FUU121E SKG → EFL Jul 5, 06:30 UTCJul 5, 07:20 UTC50m
2026-07-03 FUU121E - Jul 3, 15:35 UTCJul 3, 16:30 UTC55m
2026-07-03 FUU121E - Jul 3, 12:45 UTCJul 3, 14:45 UTC2h 0m

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 YU-PEE page for operator, model, and routing details .

Mode-S 4C3C84 frequently asked

What is Mode-S code 4C3C84?
4C3C84 is an ICAO 24-bit transponder address. Allocated to Serbia. Assigned to YU-PEE.
Where is Mode-S 4C3C84 registered?
Mode-S code 4C3C84 is allocated to Serbia (RS). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4C3C84 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4C3C84, octal 23036204, decimal 4,996,228.
What flights does 4C3C84 operate?
Mode-S 4C3C84 has broadcast 1 distinct callsign, including FUU121E.