Apparatus

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sensors Mode-S transponder

504E87

ICAO 24-bit transponder address · allocated to Moldova

Currently assigned to ER-00003 · AIRBUS A-321

Hex
504E87
Octal
24047207
Decimal
5,262,983
Country
MD
Tail
ER-00003
Type
A321
No current signal · last broadcast Jul 26, 19:30 UTC
Flights observed
394
Distinct callsigns
20
Country
MD
Last broadcast
Jul 26, 19:30 UTC

Last known position

Most recent position reported by Mode-S 504E87.

Country allocation

The ICAO 24-bit address 504E87 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
FIA6312 Four Island Air 27 2026-07-26
FIA5711 Four Island Air 23 2026-07-23
FIA5712 Four Island Air 22 2026-07-23
FIA6311 Four Island Air 21 2026-07-25
FIA5326 Four Island Air 21 2026-07-25
FIA5738 - 18 2026-07-22
FIA6822 - 17 2026-07-23
FIA5325 Four Island Air 17 2026-07-25
FIA5737 Four Island Air 16 2026-07-22
FIA6821 - 14 2026-07-23
FIA6344 Four Island Air 14 2026-05-03
FIA5902 Four Island Air 13 2026-07-25
FIA5901 Four Island Air 13 2026-07-25
FIA6343 Four Island Air 10 2026-05-03
FIA5617 Four Island Air 10 2026-07-24
FIA5581 - 10 2026-07-09
FIA5812 - 9 2026-07-18
FIA5638 - 9 2026-07-17
FIE533 - 8 2026-05-24
FIA5811 - 8 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FIA5510 TLV → RMO Jul 26, 17:10 UTCJul 26, 19:30 UTC2h 20m
2026-07-26 FIA5509 RMO → TLV Jul 26, 07:10 UTCJul 26, 15:25 UTC8h 15m
2026-07-26 FIA5685 RMO → DUS Jul 26, 03:15 UTCJul 26, 05:30 UTC2h 15m
2026-07-26 FIA6312 AYT → RMO Jul 26, 00:10 UTCJul 26, 01:35 UTC1h 25m
2026-07-25 FIA6311 RMO → AYT Jul 25, 21:20 UTCJul 25, 22:45 UTC1h 25m
2026-07-25 FIA5902 CDG → RMO Jul 25, 14:55 UTCJul 25, 17:15 UTC2h 20m
2026-07-25 FIA5901 RMO → CDG Jul 25, 10:25 UTCJul 25, 13:05 UTC2h 40m
2026-07-25 FIA5326 IST → RMO Jul 25, 07:00 UTCJul 25, 07:45 UTC45m
2026-07-25 FIA5325 RMO → IST Jul 25, 04:25 UTCJul 25, 05:25 UTC1h 0m
2026-07-24 FIA5618 LTN → RMO Jul 24, 21:50 UTCJul 25, 00:20 UTC2h 30m
2026-07-24 FIA5617 RMO → LTN Jul 24, 17:25 UTCJul 24, 20:25 UTC3h 0m
2026-07-24 FIA5232 BLQ → RMO Jul 24, 07:10 UTCJul 24, 08:45 UTC1h 35m
2026-07-24 FIA5231 RMO → BLQ Jul 24, 03:20 UTCJul 24, 05:10 UTC1h 50m
2026-07-23 FIA5712 DUB → RMO Jul 23, 22:45 UTCJul 24, 01:45 UTC3h 0m
2026-07-23 FIA5711 RMO → DUB Jul 23, 17:35 UTCJul 23, 21:00 UTC3h 25m
2026-07-23 FIA6822 - Jul 23, 13:30 UTCJul 23, 14:30 UTC1h 0m
2026-07-23 FIA6821 - Jul 23, 09:55 UTCJul 23, 10:25 UTC30m
2026-07-23 FIA5326 IST → RMO Jul 23, 06:40 UTCJul 23, 07:25 UTC45m
2026-07-23 FIA5325 RMO → IST Jul 23, 04:45 UTCJul 23, 05:15 UTC30m
2026-07-22 FIA5712 DUB → RMO Jul 22, 23:20 UTCJul 23, 02:20 UTC3h 0m
2026-07-22 FIA5711 RMO → DUB Jul 22, 18:25 UTCJul 22, 21:15 UTC2h 50m
2026-07-22 FIA5738 - Jul 22, 14:10 UTCJul 22, 16:15 UTC2h 5m
2026-07-22 FIA5737 RMO → AMS Jul 22, 10:20 UTCJul 22, 12:20 UTC2h 0m
2026-07-22 FIA5637 - Jul 22, 02:50 UTCJul 22, 04:30 UTC1h 40m
2026-07-21 FIA5548 STN → RMO Jul 21, 19:40 UTCJul 21, 22:05 UTC2h 25m
2026-07-21 FIA5547 RMO → STN Jul 21, 14:50 UTCJul 21, 17:50 UTC3h 0m
2026-07-21 FIA5686 - Jul 21, 07:40 UTCJul 21, 09:30 UTC1h 50m
2026-07-21 FIA5685 - Jul 21, 03:30 UTCJul 21, 05:50 UTC2h 20m
2026-07-20 FIA5738 - Jul 20, 14:05 UTCJul 20, 16:10 UTC2h 5m
2026-07-20 FIA5737 RMO → AMS Jul 20, 09:50 UTCJul 20, 12:30 UTC2h 40m
2026-07-19 FIA5618 - Jul 19, 21:40 UTCJul 20, 00:10 UTC2h 30m
2026-07-19 FIA5617 - Jul 19, 16:55 UTCJul 19, 19:55 UTC3h 0m
2026-07-19 FIA6822 - Jul 19, 12:40 UTCJul 19, 13:40 UTC1h 0m
2026-07-18 FIA5812 - Jul 18, 22:55 UTCJul 19, 10:45 UTC11h 50m
2026-07-18 FIA5811 - Jul 18, 13:25 UTCJul 18, 21:30 UTC8h 5m
2026-07-17 FIA5712 - Jul 17, 22:49 UTCJul 18, 11:55 UTC13h 6m
2026-07-17 FIA5711 RMO → DUB Jul 17, 18:00 UTCJul 17, 21:25 UTC3h 25m
2026-07-17 FIA5738 - Jul 17, 14:24 UTCJul 17, 16:40 UTC2h 15m
2026-07-17 FIA5737 - Jul 17, 10:05 UTCJul 17, 12:35 UTC2h 30m
2026-07-17 FIA5638 - Jul 17, 06:45 UTCJul 17, 08:40 UTC1h 55m
2026-07-17 FIA5637 - Jul 17, 02:54 UTCJul 17, 05:10 UTC2h 15m
2026-07-16 FIA6822 - Jul 16, 12:20 UTCJul 16, 13:20 UTC1h 0m
2026-07-16 FIA6821 - Jul 16, 09:15 UTCJul 16, 10:10 UTC55m
2026-07-16 FIA5326 - Jul 16, 06:30 UTCJul 16, 07:15 UTC45m
2026-07-16 FIA6312 - Jul 16, 00:20 UTCJul 16, 01:45 UTC1h 25m
2026-07-15 FIA5904 NCE → AYT Jul 15, 17:05 UTCJul 15, 22:45 UTC5h 40m
2026-07-15 FIA5903 - Jul 15, 13:10 UTCJul 15, 15:00 UTC1h 50m
2026-07-15 FIA5638 - Jul 15, 09:00 UTCJul 15, 10:45 UTC1h 45m
2026-07-14 FIA5712 - Jul 14, 22:50 UTCJul 15, 07:05 UTC8h 15m
2026-07-14 FIA5711 - Jul 14, 17:40 UTCJul 14, 21:05 UTC3h 25m

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-00003 page for operator, model, and routing details .

Mode-S 504E87 frequently asked

What is Mode-S code 504E87?
504E87 is an ICAO 24-bit transponder address. Allocated to Moldova. Assigned to ER-00003.
Where is Mode-S 504E87 registered?
Mode-S code 504E87 is allocated to Moldova (MD). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 504E87 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 504E87, octal 24047207, decimal 5,262,983.
What flights does 504E87 operate?
Mode-S 504E87 has broadcast 20 distinct callsigns, including FIA6312, FIA5711, FIA5712, FIA6311, FIA5326.