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 TVS8TY · 36,000 ft
Flights observed
217
Distinct callsigns
20
Country
MD
Last broadcast
Jul 26, 22:15 UTC

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
FIA6816 - 12 2026-07-25
FIA5512 Four Island Air 12 2026-07-26
FIA5511 Four Island Air 12 2026-07-25
FIA6815 - 11 2026-07-26
FIA6343 - 10 2026-07-20
FIA6344 Four Island Air 9 2026-07-21
FIA6412 - 6 2026-07-17
FIA5216 Four Island Air 6 2026-07-25
FIE533 - 5 2026-05-25
FIA5813 Four Island Air 5 2026-07-18
FIA5686 - 5 2026-07-16
FIA5582 Four Island Air 5 2026-07-23
FIA5581 Four Island Air 5 2026-07-23
FIA6411 - 4 2026-07-17
FIA5685 - 4 2026-07-14
FIA5617 Four Island Air 4 2026-07-25
FIA5420 Four Island Air 4 2026-07-24
FIA5419 Four Island Air 4 2026-07-24
FIA5402 Four Island Air 4 2026-07-19
FIA5401 - 4 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FIA6815 - Jul 26, 21:20 UTCJul 26, 22:15 UTC55m
2026-07-26 FIA5512 BCN → RMO Jul 26, 15:55 UTCJul 26, 18:40 UTC2h 45m
2026-07-25 FIA5511 RMO → BCN Jul 25, 21:30 UTCJul 26, 14:30 UTC17h 1m
2026-07-25 FIA5617 RMO → LTN Jul 25, 17:05 UTCJul 25, 19:35 UTC2h 30m
2026-07-25 FIA5216 PMF → RMO Jul 25, 13:05 UTCJul 25, 14:50 UTC1h 45m
2026-07-25 FIA5215 RMO → PMF Jul 25, 09:40 UTCJul 25, 11:40 UTC2h 0m
2026-07-25 FIA6816 - Jul 25, 00:05 UTCJul 25, 01:25 UTC1h 20m
2026-07-24 FIA6815 - Jul 24, 22:05 UTCJul 24, 22:50 UTC45m
2026-07-24 FIA5328 IST → RMO Jul 24, 18:50 UTCJul 24, 19:35 UTC45m
2026-07-24 FIA5327 RMO → IST Jul 24, 17:00 UTCJul 24, 17:35 UTC35m
2026-07-24 FIA5420 PMI → RMO Jul 24, 10:55 UTCJul 24, 13:40 UTC2h 45m
2026-07-24 FIA5419 RMO → PMI Jul 24, 05:55 UTCJul 24, 08:50 UTC2h 55m
2026-07-23 FIA5582 TBS → RMO Jul 23, 22:15 UTCJul 23, 23:30 UTC1h 15m
2026-07-23 FIA5581 RMO → TBS Jul 23, 20:25 UTCJul 23, 20:45 UTC20m
2026-07-23 FIA5581 RMO → TBS Jul 23, 18:45 UTCJul 23, 19:25 UTC40m
2026-07-23 FIA5714 PRG → RMO Jul 23, 14:15 UTCJul 23, 15:35 UTC1h 20m
2026-07-23 FIA5713 RMO → PRG Jul 23, 07:35 UTCJul 23, 12:50 UTC5h 15m
2026-07-23 FIA5921 RMO → BUS Jul 23, 05:55 UTCJul 23, 06:00 UTC5m
2026-07-23 FIA6816 - Jul 23, 00:05 UTCJul 23, 01:30 UTC1h 25m
2026-07-22 FIA5512 BCN → RMO Jul 22, 15:20 UTCJul 22, 22:45 UTC7h 25m
2026-07-22 FIA5511 RMO → BCN Jul 22, 11:10 UTCJul 22, 13:25 UTC2h 15m
2026-07-22 FIA5611 RMO → BER Jul 22, 03:05 UTCJul 22, 04:55 UTC1h 50m
2026-07-21 FIA6816 - Jul 21, 23:50 UTCJul 22, 01:10 UTC1h 20m
2026-07-21 FIA6815 - Jul 21, 21:55 UTCJul 21, 22:50 UTC55m
2026-07-21 FIA6344 SSH → RMO Jul 21, 09:00 UTCJul 21, 11:20 UTC2h 20m
2026-07-20 FIA6343 - Jul 20, 20:50 UTCJul 21, 07:05 UTC10h 15m
2026-07-20 FIA5327 RMO → IST Jul 20, 18:20 UTCJul 20, 19:10 UTC50m
2026-07-19 FIA6343 - Jul 19, 23:30 UTCJul 20, 11:15 UTC11h 45m
2026-07-19 FIA5921 - Jul 19, 20:30 UTCJul 19, 21:20 UTC50m
2026-07-19 FIA5402 AGP → RMO Jul 19, 12:05 UTCJul 19, 15:20 UTC3h 15m
2026-07-19 FIA5401 - Jul 19, 06:40 UTCJul 19, 10:40 UTC4h 0m
2026-07-18 FIA6816 - Jul 18, 23:45 UTCJul 19, 01:10 UTC1h 25m
2026-07-18 FIA6815 - Jul 18, 21:20 UTCJul 18, 22:40 UTC1h 20m
2026-07-18 FIA5548 STN → RMO Jul 18, 17:25 UTCJul 18, 19:50 UTC2h 25m
2026-07-18 FIA5547 RMO → STN Jul 18, 13:25 UTCJul 18, 16:00 UTC2h 35m
2026-07-18 FIA5814 ALC → RMO Jul 18, 08:20 UTCJul 18, 11:10 UTC2h 50m
2026-07-18 FIA5813 RMO → ALC Jul 18, 03:25 UTCJul 18, 06:55 UTC3h 30m
2026-07-17 FIA5582 - Jul 17, 22:20 UTCJul 17, 23:25 UTC1h 5m
2026-07-17 FIA5582 - Jul 17, 20:25 UTCJul 17, 20:44 UTC20m
2026-07-17 FIA5581 - Jul 17, 18:44 UTCJul 17, 19:25 UTC40m
2026-07-17 FIA6412 - Jul 17, 04:39 UTCJul 17, 06:20 UTC1h 40m
2026-07-17 FIA6411 - Jul 17, 01:35 UTCJul 17, 03:10 UTC1h 35m
2026-07-16 FIA5714 - Jul 16, 14:40 UTCJul 16, 16:00 UTC1h 20m
2026-07-16 FIA5713 - Jul 16, 11:10 UTCJul 16, 12:44 UTC1h 35m
2026-07-16 FIA5686 - Jul 16, 07:05 UTCJul 16, 09:00 UTC1h 55m
2026-07-15 FIA5618 - Jul 15, 21:30 UTCJul 16, 05:50 UTC8h 20m
2026-07-15 FIA5617 - Jul 15, 12:45 UTCJul 15, 19:50 UTC7h 5m
2026-07-15 FIA6412 - Jul 15, 04:30 UTCJul 15, 11:20 UTC6h 50m
2026-07-14 FIA5216 - Jul 14, 14:10 UTCJul 15, 03:00 UTC12h 49m
2026-07-14 FIA5686 - Jul 14, 06:45 UTCJul 14, 12:45 UTC6h 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 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 FIA6816, FIA5512, FIA5511, FIA6815, FIA6343.