Apparatus

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sensors Mode-S transponder

504E77

ICAO 24-bit transponder address · allocated to Moldova

Currently assigned to ER-00009 · AIRBUS A-321

Hex
504E77
Octal
24047167
Decimal
5,262,967
Country
MD
Tail
ER-00009
Type
A321
No current signal · last broadcast 6d ago
Flights observed
179
Distinct callsigns
20
Country
MD
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S 504E77.

Country allocation

The ICAO 24-bit address 504E77 falls within the block assigned to Moldova (MD) by ICAO Annex 10, Volume III. Every aircraft registered in Moldova 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
FIA6319 Four Island Air 22 2026-07-26
FIA6320 Four Island Air 21 2026-07-26
FIA6312 - 11 2026-07-20
FIA6311 - 11 2026-07-19
FIA5901 - 7 2026-07-18
FIA5712 Four Island Air 7 2026-07-24
FIA5711 Four Island Air 7 2026-07-24
FIA5902 - 6 2026-07-18
FIA5836 - 5 2026-07-23
FIA5835 Four Island Air 5 2026-07-23
FIA5812 Four Island Air 5 2026-07-25
FIA5811 Four Island Air 5 2026-07-25
FIA5618 Four Island Air 5 2026-07-26
FIA5617 Four Island Air 5 2026-07-26
FIA5813 Four Island Air 4 2026-07-25
FIA5738 - 4 2026-07-04
FIA5737 - 4 2026-07-04
FIA5233 Four Island Air 4 2026-07-24
FIA5904 Four Island Air 3 2026-07-19
FIA5903 Four Island Air 3 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FIA5618 LTN → RMO Jul 26, 21:25 UTCJul 26, 21:45 UTC20m
2026-07-26 FIA5617 RMO → LTN Jul 26, 16:55 UTCJul 26, 20:00 UTC3h 5m
2026-07-26 FIA6822 TIV → RMO Jul 26, 10:40 UTCJul 26, 14:35 UTC3h 55m
2026-07-26 FIA6320 AYT → RMO Jul 26, 07:35 UTCJul 26, 09:05 UTC1h 30m
2026-07-26 FIA6319 RMO → AYT Jul 26, 04:25 UTCJul 26, 06:05 UTC1h 40m
2026-07-25 FIA5812 LIS → RMO Jul 25, 23:20 UTCJul 26, 02:55 UTC3h 35m
2026-07-25 FIA5811 RMO → LIS Jul 25, 08:55 UTCJul 25, 21:20 UTC12h 25m
2026-07-25 FIA5813 RMO → ALC Jul 25, 03:20 UTCJul 25, 06:50 UTC3h 30m
2026-07-24 FIA5712 DUB → RMO Jul 24, 22:50 UTCJul 25, 01:50 UTC3h 0m
2026-07-24 FIA5711 RMO → DUB Jul 24, 12:55 UTCJul 24, 21:20 UTC8h 25m
2026-07-24 FIA5233 RMO → VRN Jul 24, 10:10 UTCJul 24, 11:20 UTC1h 10m
2026-07-24 FIA5638 HHN → RMO Jul 24, 06:00 UTCJul 24, 07:50 UTC1h 50m
2026-07-24 FIA5637 RMO → HHN Jul 24, 02:10 UTCJul 24, 04:25 UTC2h 15m
2026-07-23 FIA5836 - Jul 23, 14:55 UTCJul 23, 17:05 UTC2h 10m
2026-07-23 FIA5835 RMO → BRU Jul 23, 07:20 UTCJul 23, 13:10 UTC5h 50m
2026-07-23 FIA6319 RMO → AYT Jul 23, 04:40 UTCJul 23, 05:55 UTC1h 15m
2026-07-22 FIA5812 LIS → RMO Jul 22, 22:50 UTCJul 23, 02:25 UTC3h 35m
2026-07-22 FIA5811 RMO → LIS Jul 22, 17:20 UTCJul 22, 21:05 UTC3h 45m
2026-07-21 FIA5712 DUB → RMO Jul 21, 22:30 UTCJul 22, 05:25 UTC6h 55m
2026-07-21 FIA5711 RMO → DUB Jul 21, 17:30 UTCJul 21, 20:55 UTC3h 25m
2026-07-21 FIA6822 - Jul 21, 13:05 UTCJul 21, 14:05 UTC1h 0m
2026-07-21 FIA6821 - Jul 21, 09:35 UTCJul 21, 10:45 UTC1h 10m
2026-07-21 FIA6320 AYT → RMO Jul 21, 06:45 UTCJul 21, 08:10 UTC1h 25m
2026-07-21 FIA6319 RMO → AYT Jul 21, 04:20 UTCJul 21, 05:20 UTC1h 0m
2026-07-20 FIA5234 - Jul 20, 13:50 UTCJul 20, 15:25 UTC1h 35m
2026-07-20 FIA5233 RMO → VRN Jul 20, 07:20 UTCJul 20, 12:35 UTC5h 15m
2026-07-20 FIA6319 RMO → AYT Jul 20, 04:05 UTCJul 20, 05:35 UTC1h 30m
2026-07-20 FIA6312 - Jul 20, 00:45 UTCJul 20, 02:05 UTC1h 20m
2026-07-19 FIA6311 - Jul 19, 22:40 UTCJul 19, 23:30 UTC50m
2026-07-19 FIA5904 NCE → RMO Jul 19, 18:35 UTCJul 19, 20:30 UTC1h 55m
2026-07-19 FIA5903 RMO → NCE Jul 19, 14:40 UTCJul 19, 17:20 UTC2h 40m
2026-07-19 FIA5686 - Jul 19, 07:30 UTCJul 19, 09:20 UTC1h 50m
2026-07-19 FIA5685 - Jul 19, 00:05 UTCJul 19, 05:50 UTC5h 45m
2026-07-18 FIA6311 - Jul 18, 21:25 UTCJul 18, 22:50 UTC1h 25m
2026-07-18 FIA5902 - Jul 18, 15:20 UTCJul 18, 17:35 UTC2h 15m
2026-07-18 FIA5901 - Jul 18, 10:25 UTCJul 18, 13:05 UTC2h 40m
2026-07-18 FIA6320 - Jul 18, 07:30 UTCJul 18, 08:55 UTC1h 25m
2026-07-18 FIA6319 - Jul 18, 04:25 UTCJul 18, 06:15 UTC1h 50m
2026-07-18 FIA6312 - Jul 18, 00:04 UTCJul 18, 01:34 UTC1h 30m
2026-07-17 FIA5902 - Jul 17, 14:00 UTCJul 17, 22:45 UTC8h 45m
2026-07-17 FIA5901 - Jul 17, 09:50 UTCJul 17, 12:30 UTC2h 40m
2026-07-17 FIA6320 - Jul 17, 07:05 UTCJul 17, 08:30 UTC1h 25m
2026-07-17 FIA6319 - Jul 17, 04:20 UTCJul 17, 05:30 UTC1h 10m
2026-07-17 FIA6312 - Jul 17, 00:10 UTCJul 17, 01:39 UTC1h 30m
2026-07-16 FIA6311 - Jul 16, 21:25 UTCJul 16, 22:55 UTC1h 30m
2026-07-16 FIA5836 - Jul 16, 15:10 UTCJul 16, 17:10 UTC2h 0m
2026-07-16 FIA5835 - Jul 16, 11:25 UTCJul 16, 13:49 UTC2h 25m
2026-07-16 FIA6320 - Jul 16, 08:35 UTCJul 16, 10:00 UTC1h 25m
2026-07-15 FIA5812 LIS → AYT Jul 15, 23:30 UTCJul 16, 07:20 UTC7h 50m
2026-07-15 FIA5811 - Jul 15, 16:40 UTCJul 15, 21:20 UTC4h 40m

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 ER-00009 page for operator, model, and routing details .

Mode-S 504E77 frequently asked

What is Mode-S code 504E77?
504E77 is an ICAO 24-bit transponder address. Allocated to Moldova. Assigned to ER-00009.
Where is Mode-S 504E77 registered?
Mode-S code 504E77 is allocated to Moldova (MD). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 504E77 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 504E77, octal 24047167, decimal 5,262,967.
What flights does 504E77 operate?
Mode-S 504E77 has broadcast 20 distinct callsigns, including FIA6319, FIA6320, FIA6312, FIA6311, FIA5901.