Apparatus

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sensors Mode-S transponder

503FC4

ICAO 24-bit transponder address · allocated to Lithuania

Hex
503FC4
Octal
24037704
Decimal
5,259,204
Country
LT
No current signal · last broadcast 13h ago
Flights observed
154
Distinct callsigns
20
Country
LT
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 503FC4.

Country allocation

The ICAO 24-bit address 503FC4 falls within the block assigned to Lithuania (LT) by ICAO Annex 10, Volume III. Every aircraft registered in Lithuania 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 20 distinct

Callsign Airline Flights Last seen
ELY5488 - 11 2026-07-16
ELY5487 - 10 2026-07-16
ELY5129 - 9 2026-07-16
ELY5130 - 8 2026-07-16
ELY5182 - 7 2026-07-12
ELY5181 - 7 2026-07-12
ELY5414 - 5 2026-07-13
ELY5413 - 5 2026-07-13
ELY5137 El Al Israel Airlines 5 2026-07-17
ELY5102 - 5 2026-07-15
ELY5101 - 5 2026-07-15
ELY5426 - 4 2026-07-13
ELY5425 - 4 2026-07-13
ELY5188 El Al Israel Airlines 4 2026-07-17
ELY5187 El Al Israel Airlines 4 2026-07-17
ELY5138 - 4 2026-06-28
ELY5484 El Al Israel Airlines 2 2026-06-20
ELY5468 - 2 2026-06-23
ELY5467 - 2 2026-06-23
ELY5437 El Al Israel Airlines 2 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 ELY5137 TLV → PFO Jul 17, 12:45 UTCJul 17, 13:29 UTC45m
2026-07-17 ELY5188 DBV → TLV Jul 17, 08:35 UTCJul 17, 10:55 UTC2h 20m
2026-07-17 ELY5187 TLV → DBV Jul 17, 03:59 UTCJul 17, 06:45 UTC2h 45m
2026-07-16 ELY5130 - Jul 16, 18:59 UTCJul 16, 21:15 UTC2h 15m
2026-07-16 ELY5129 - Jul 16, 14:55 UTCJul 16, 17:10 UTC2h 15m
2026-07-16 ELY5488 - Jul 16, 10:04 UTCJul 16, 12:49 UTC2h 45m
2026-07-16 ELY5487 - Jul 16, 04:30 UTCJul 16, 07:30 UTC3h 0m
2026-07-15 ELY5129 TLV → TLV Jul 15, 13:50 UTCJul 15, 20:15 UTC6h 25m
2026-07-15 ELY5102 - Jul 15, 07:55 UTCJul 15, 11:10 UTC3h 15m
2026-07-15 ELY5101 TLV → WAW Jul 15, 02:55 UTCJul 15, 06:25 UTC3h 30m
2026-07-14 ELY5120 - Jul 14, 20:30 UTCJul 14, 23:30 UTC2h 59m
2026-07-14 ELY5119 - Jul 14, 15:40 UTCJul 14, 18:50 UTC3h 10m
2026-07-14 ELY5102 - Jul 14, 10:05 UTCJul 14, 13:25 UTC3h 20m
2026-07-14 ELY5101 TLV → WAW Jul 14, 04:55 UTCJul 14, 08:15 UTC3h 20m
2026-07-13 ELY5426 - Jul 13, 21:35 UTCJul 13, 23:55 UTC2h 20m
2026-07-13 ELY5425 - Jul 13, 16:50 UTCJul 13, 19:30 UTC2h 40m
2026-07-13 ELY5414 - Jul 13, 10:15 UTCJul 13, 13:50 UTC3h 35m
2026-07-13 ELY5413 - Jul 13, 04:25 UTCJul 13, 08:25 UTC4h 0m
2026-07-12 ELY5182 - Jul 12, 23:25 UTCJul 13, 02:15 UTC2h 50m
2026-07-12 ELY5181 - Jul 12, 18:25 UTCJul 12, 21:15 UTC2h 50m
2026-07-12 ELY5488 - Jul 12, 09:30 UTCJul 12, 12:30 UTC3h 0m
2026-07-12 ELY5487 - Jul 12, 04:15 UTCJul 12, 07:35 UTC3h 20m
2026-07-11 ELY5248 SKG → TLV Jul 11, 21:50 UTCJul 11, 23:40 UTC1h 50m
2026-07-10 ELY5247 TLV → SKG Jul 10, 12:30 UTCJul 10, 14:35 UTC2h 5m
2026-07-10 ELY5188 DBV → TLV Jul 10, 08:05 UTCJul 10, 10:25 UTC2h 20m
2026-07-10 ELY5187 TLV → DBV Jul 10, 04:10 UTCJul 10, 06:55 UTC2h 45m
2026-07-09 ELY5130 - Jul 9, 19:00 UTCJul 9, 21:25 UTC2h 25m
2026-07-09 ELY5129 - Jul 9, 14:50 UTCJul 9, 17:10 UTC2h 20m
2026-07-09 ELY5488 - Jul 9, 09:30 UTCJul 9, 12:30 UTC3h 0m
2026-07-09 ELY5487 - Jul 9, 04:15 UTCJul 9, 07:20 UTC3h 5m
2026-07-08 ELY5130 - Jul 8, 18:20 UTCJul 8, 20:35 UTC2h 15m
2026-07-08 ELY5129 - Jul 8, 14:00 UTCJul 8, 16:10 UTC2h 10m
2026-07-08 ELY5102 - Jul 8, 08:10 UTCJul 8, 11:25 UTC3h 15m
2026-07-08 ELY5101 TLV → WAW Jul 8, 03:00 UTCJul 8, 06:45 UTC3h 45m
2026-07-07 ELY5182 - Jul 7, 21:25 UTCJul 8, 00:00 UTC2h 35m
2026-07-07 ELY5181 - Jul 7, 16:40 UTCJul 7, 19:40 UTC3h 0m
2026-07-07 ELY5156 - Jul 7, 08:15 UTCJul 7, 10:15 UTC2h 0m
2026-07-07 ELY5155 - Jul 7, 04:35 UTCJul 7, 06:30 UTC1h 55m
2026-07-06 ELY5414 - Jul 6, 11:30 UTCJul 6, 15:05 UTC3h 35m
2026-07-06 ELY5413 - Jul 6, 05:40 UTCJul 6, 09:45 UTC4h 5m
2026-07-05 ELY5182 - Jul 5, 21:05 UTCJul 5, 23:50 UTC2h 45m
2026-07-05 ELY5181 - Jul 5, 16:10 UTCJul 5, 19:15 UTC3h 5m
2026-07-05 ELY5488 - Jul 5, 10:30 UTCJul 5, 13:25 UTC2h 55m
2026-07-05 ELY5487 - Jul 5, 04:35 UTCJul 5, 07:45 UTC3h 10m
2026-07-04 ELY5436 - Jul 4, 21:25 UTCJul 4, 22:05 UTC40m
2026-07-03 ELY5435 TLV → LCA Jul 3, 12:50 UTCJul 3, 13:30 UTC40m
2026-07-03 ELY5188 DBV → TLV Jul 3, 08:45 UTCJul 3, 11:10 UTC2h 25m
2026-07-03 ELY5187 TLV → DBV Jul 3, 03:45 UTCJul 3, 06:30 UTC2h 45m
2026-07-02 ELY5130 RMO → TLV Jul 2, 20:10 UTCJul 2, 21:40 UTC1h 30m
2026-07-02 ELY5129 - Jul 2, 15:25 UTCJul 2, 17:35 UTC2h 10m

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 503FC4 frequently asked

What is Mode-S code 503FC4?
503FC4 is an ICAO 24-bit transponder address. Allocated to Lithuania.
Where is Mode-S 503FC4 registered?
Mode-S code 503FC4 is allocated to Lithuania (LT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 503FC4 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 503FC4, octal 24037704, decimal 5,259,204.
What flights does 503FC4 operate?
Mode-S 503FC4 has broadcast 20 distinct callsigns, including ELY5488, ELY5487, ELY5129, ELY5130, ELY5182.