Apparatus

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sensors Mode-S transponder

504E81

ICAO 24-bit transponder address · allocated to Moldova

Currently assigned to ER-00011 · AIRBUS A-320

Hex
504E81
Octal
24047201
Decimal
5,262,977
Country
MD
Tail
ER-00011
Type
A320
Broadcasting now · callsign FIA5685 · 38,000 ft
Flights observed
166
Distinct callsigns
20
Country
MD
Last broadcast
5h ago

Current position

504E81 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 504E81 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
FIA5512 - 10 2026-07-12
FIA5511 - 10 2026-07-12
FIA6816 - 8 2026-07-12
FIA6344 - 8 2026-07-11
FIA6343 - 8 2026-07-10
FIA6815 - 7 2026-07-11
FIE533 - 5 2026-05-25
FIA6412 - 4 2026-07-08
FIA5813 Four Island Air 4 2026-06-02
FIA5233 Four Island Air 4 2026-06-12
FIA5216 - 4 2026-07-07
FIA6411 - 3 2026-07-01
FIA5901 Four Island Air 3 2026-04-24
FIA5686 - 3 2026-07-09
FIA5685 - 3 2026-07-09
FIA5608 Four Island Air 3 2026-04-19
FIA5607 Four Island Air 3 2026-04-19
FIA5420 - 3 2026-07-03
FIA5419 - 3 2026-07-03
FIA5402 Four Island Air 3 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FIA5328 - Jul 13, 20:50 UTCJul 13, 21:35 UTC45m
2026-07-13 FIA5327 - Jul 13, 18:40 UTCJul 13, 19:05 UTC25m
2026-07-13 FIA5908 - Jul 13, 13:10 UTCJul 13, 15:15 UTC2h 5m
2026-07-12 FIA6816 - Jul 12, 23:50 UTCJul 13, 10:45 UTC10h 55m
2026-07-12 FIA5512 BCN → AYT Jul 12, 15:35 UTCJul 12, 22:55 UTC7h 20m
2026-07-12 FIA5511 - Jul 12, 10:45 UTCJul 12, 13:50 UTC3h 5m
2026-07-11 FIA6816 - Jul 11, 23:50 UTCJul 12, 01:10 UTC1h 20m
2026-07-11 FIA6815 - Jul 11, 21:50 UTCJul 11, 22:45 UTC55m
2026-07-11 FIA6344 - Jul 11, 09:20 UTCJul 11, 11:35 UTC2h 15m
2026-07-10 FIA6343 - Jul 10, 23:50 UTCJul 11, 07:10 UTC7h 20m
2026-07-10 FIA6815 - Jul 10, 21:10 UTCJul 10, 22:35 UTC1h 25m
2026-07-10 FIA5512 - Jul 10, 15:50 UTCJul 10, 18:15 UTC2h 25m
2026-07-10 FIA5511 - Jul 10, 10:50 UTCJul 10, 14:00 UTC3h 10m
2026-07-10 FIA5232 - Jul 10, 07:15 UTCJul 10, 08:50 UTC1h 35m
2026-07-09 FIA5406 GVA → BLQ Jul 9, 14:35 UTCJul 10, 05:05 UTC14h 30m
2026-07-09 FIA5405 - Jul 9, 10:30 UTCJul 9, 13:00 UTC2h 30m
2026-07-09 FIA5686 - Jul 9, 07:05 UTCJul 9, 09:00 UTC1h 55m
2026-07-09 FIA5685 - Jul 9, 03:10 UTCJul 9, 05:35 UTC2h 25m
2026-07-09 FIA6816 - Jul 9, 00:10 UTCJul 9, 01:35 UTC1h 25m
2026-07-08 FIA6815 - Jul 8, 21:35 UTCJul 8, 23:00 UTC1h 25m
2026-07-08 FIA5512 - Jul 8, 15:15 UTCJul 8, 17:55 UTC2h 40m
2026-07-08 FIA5511 - Jul 8, 10:15 UTCJul 8, 13:15 UTC3h 0m
2026-07-08 FIA6412 - Jul 8, 07:05 UTCJul 8, 08:45 UTC1h 40m
2026-07-07 FIA5216 - Jul 7, 14:00 UTCJul 8, 05:40 UTC15h 40m
2026-07-07 FIA5215 - Jul 7, 10:35 UTCJul 7, 12:35 UTC2h 0m
2026-07-07 FIA5326 - Jul 7, 06:55 UTCJul 7, 07:35 UTC40m
2026-07-07 FIA5325 - Jul 7, 05:05 UTCJul 7, 05:20 UTC15m
2026-07-06 FIA5812 - Jul 6, 22:20 UTCJul 7, 02:10 UTC3h 50m
2026-07-06 FIA5811 CLJ → LIS Jul 6, 16:50 UTCJul 6, 20:45 UTC3h 55m
2026-07-06 FIA6344 - Jul 6, 05:00 UTCJul 6, 11:20 UTC6h 20m
2026-07-05 FIA5922 - Jul 5, 23:35 UTCJul 6, 00:20 UTC45m
2026-07-05 FIA5921 - Jul 5, 22:05 UTCJul 5, 22:10 UTC5m
2026-07-05 FIA5512 - Jul 5, 16:15 UTCJul 5, 18:55 UTC2h 40m
2026-07-05 FIA5511 - Jul 5, 10:50 UTCJul 5, 13:50 UTC3h 0m
2026-07-05 FIA5686 - Jul 5, 07:10 UTCJul 5, 09:05 UTC1h 55m
2026-07-04 FIA5685 - Jul 4, 10:20 UTCJul 5, 05:35 UTC19h 15m
2026-07-04 FIA6344 - Jul 4, 09:10 UTCJul 5, 05:35 UTC20h 25m
2026-07-04 FIA6343 - Jul 4, 04:40 UTCJul 4, 07:10 UTC2h 30m
2026-07-03 FIA5812 - Jul 3, 22:05 UTCJul 4, 01:50 UTC3h 45m
2026-07-03 FIA5811 - Jul 3, 16:25 UTCJul 3, 20:45 UTC4h 20m
2026-07-03 FIA5420 - Jul 3, 11:00 UTCJul 3, 13:55 UTC2h 55m
2026-07-03 FIA5419 - Jul 3, 06:00 UTCJul 3, 08:55 UTC2h 55m
2026-07-02 FIA5402 AGP → RMO Jul 2, 11:35 UTCJul 2, 15:20 UTC3h 45m
2026-07-02 FIA5401 RMO → AGP Jul 2, 06:30 UTCJul 2, 09:50 UTC3h 20m
2026-07-01 FIA5904 NCE → RMO Jul 1, 16:30 UTCJul 1, 18:40 UTC2h 10m
2026-07-01 FIA5903 RMO → NCE Jul 1, 13:05 UTCJul 1, 15:00 UTC1h 55m
2026-07-01 FIA6412 - Jul 1, 05:35 UTCJul 1, 07:10 UTC1h 35m
2026-07-01 FIA6411 - Jul 1, 02:10 UTCJul 1, 03:35 UTC1h 25m
2026-06-30 FIA5908 - Jun 30, 13:40 UTCJun 30, 14:40 UTC1h 0m
2026-06-30 FIA5907 - Jun 30, 10:05 UTCJun 30, 11:45 UTC1h 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-00011 page for operator, model, and routing details .

Mode-S 504E81 frequently asked

What is Mode-S code 504E81?
504E81 is an ICAO 24-bit transponder address. Allocated to Moldova. Assigned to ER-00011.
Where is Mode-S 504E81 registered?
Mode-S code 504E81 is allocated to Moldova (MD). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 504E81 broadcasting right now?
Yes. Mode-S 504E81 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 504E81, octal 24047201, decimal 5,262,977.
What flights does 504E81 operate?
Mode-S 504E81 has broadcast 20 distinct callsigns, including FIA5512, FIA5511, FIA6816, FIA6344, FIA6343.