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
No current signal · last broadcast 1h ago
Flights observed
76
Distinct callsigns
20
Country
MD
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 504E81.

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
FIE533 - 5 2026-05-25
FIA5512 Four Island Air 5 2026-05-06
FIA5511 Four Island Air 5 2026-05-06
FIA6343 Four Island Air 4 2026-05-10
FIA6344 Four Island Air 3 2026-05-10
FIA5901 Four Island Air 3 2026-04-24
FIA5813 Four Island Air 3 2026-04-18
FIA5608 Four Island Air 3 2026-04-19
FIA5607 Four Island Air 3 2026-04-19
FIA5233 Four Island Air 3 2026-04-23
FIA5216 - 3 2026-04-22
FIE534 - 2 2026-05-05
FIA6816 - 2 2026-05-29
FIA6815 - 2 2026-05-29
FIA6742 Four Island Air 2 2026-04-17
FIA6741 Four Island Air 2 2026-04-17
FIA5738 Four Island Air 2 2026-05-11
FIA5737 Four Island Air 2 2026-05-11
FIA5618 Four Island Air 2 2026-04-15
FIA5617 - 2 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 FIA6816 - May 29, 23:35 UTCMay 30, 00:15 UTC40m
2026-05-29 FIA6815 - May 29, 21:10 UTCMay 29, 22:30 UTC1h 20m
2026-05-25 FIE533 - May 25, 04:25 UTCMay 25, 05:15 UTC50m
2026-05-24 FIA6518 - May 24, 18:50 UTCMay 24, 23:30 UTC4h 40m
2026-05-24 FIA6517 - May 24, 02:55 UTCMay 24, 17:30 UTC14h 35m
2026-05-24 FIA6801 - May 24, 01:00 UTCMay 24, 01:35 UTC35m
2026-05-23 FIA6816 - May 23, 00:20 UTCMay 23, 01:45 UTC1h 25m
2026-05-22 FIA6815 - May 22, 21:35 UTCMay 22, 23:05 UTC1h 30m
2026-05-11 FIA5738 AMS → RMO May 11, 14:05 UTCMay 11, 16:15 UTC2h 10m
2026-05-11 FIA5737 RMO → AMS May 11, 09:35 UTCMay 11, 12:00 UTC2h 25m
2026-05-10 FIE533 - May 10, 21:44 UTCMay 11, 05:25 UTC7h 40m
2026-05-10 FIA6344 SSH → RMO May 10, 10:40 UTCMay 10, 13:05 UTC2h 25m
2026-05-10 FIA6343 RMO → SSH May 10, 06:10 UTCMay 10, 08:35 UTC2h 25m
2026-05-09 FIA6312 AYT → RMO May 9, 00:05 UTCMay 9, 01:25 UTC1h 20m
2026-05-08 FIA6311 RMO → AYT May 8, 21:20 UTCMay 8, 22:50 UTC1h 30m
2026-05-07 FIA6344 SSH → RMO May 7, 06:05 UTCMay 7, 13:10 UTC7h 6m
2026-05-06 FIA5512 BCN → RMO May 6, 15:25 UTCMay 6, 18:00 UTC2h 35m
2026-05-06 FIA5511 RMO → BCN May 6, 04:45 UTCMay 6, 13:25 UTC8h 40m
2026-05-05 FIE534 - May 5, 21:50 UTCMay 5, 23:30 UTC1h 40m
2026-05-05 FIA6343 RMO → SSH May 5, 06:05 UTCMay 5, 13:10 UTC7h 5m
2026-04-26 FIA5836 BRU → RMO Apr 26, 14:55 UTCApr 26, 17:00 UTC2h 5m
2026-04-26 FIA5835 RMO → BRU Apr 26, 11:15 UTCApr 26, 13:55 UTC2h 40m
2026-04-25 FIA5738 AMS → RMO Apr 25, 14:05 UTCApr 25, 16:05 UTC2h 0m
2026-04-24 FIA5737 RMO → AMS Apr 24, 23:55 UTCApr 25, 12:10 UTC12h 15m
2026-04-24 FIA5902 CDG → RMO Apr 24, 14:45 UTCApr 24, 22:55 UTC8h 10m
2026-04-24 FIA5901 RMO → CDG Apr 24, 10:20 UTCApr 24, 12:45 UTC2h 25m
2026-04-23 FIA5901 RMO → CDG Apr 23, 14:20 UTCApr 24, 12:45 UTC22h 25m
2026-04-23 FIA5901 RMO → CDG Apr 23, 14:00 UTCApr 24, 12:15 UTC22h 15m
2026-04-23 FIA5233 RMO → VRN Apr 23, 10:45 UTCApr 23, 12:30 UTC1h 45m
2026-04-23 FIE533 - Apr 23, 05:10 UTCApr 23, 06:10 UTC1h 0m
2026-04-22 FIE534 - Apr 22, 21:45 UTCApr 22, 23:20 UTC1h 35m
2026-04-22 FIA5216 - Apr 22, 13:30 UTCApr 22, 15:15 UTC1h 45m
2026-04-22 FIA5686 DUS → RMO Apr 22, 06:45 UTCApr 22, 12:20 UTC5h 35m
2026-04-22 FIA5685 RMO → DUS Apr 22, 02:35 UTCApr 22, 04:50 UTC2h 15m
2026-04-21 FIA5326 IST → RMO Apr 21, 06:45 UTCApr 21, 07:30 UTC45m
2026-04-19 FIA5608 BRE → RMO Apr 19, 06:40 UTCApr 19, 08:35 UTC1h 55m
2026-04-19 FIA5607 RMO → BRE Apr 19, 03:20 UTCApr 19, 05:30 UTC2h 10m
2026-04-18 FIA5548 STN → RMO Apr 18, 17:20 UTCApr 18, 19:50 UTC2h 30m
2026-04-18 FIA5547 - Apr 18, 13:10 UTCApr 18, 15:50 UTC2h 40m
2026-04-18 FIA5814 ALC → RMO Apr 18, 08:10 UTCApr 18, 11:25 UTC3h 15m
2026-04-18 FIA5813 RMO → ALC Apr 18, 05:25 UTCApr 18, 06:55 UTC1h 30m
2026-04-18 FIA5813 RMO → ALC Apr 18, 04:45 UTCApr 18, 06:40 UTC1h 55m
2026-04-18 FIA5813 RMO → ALC Apr 18, 04:00 UTCApr 18, 05:20 UTC1h 20m
2026-04-17 FIA5512 - Apr 17, 17:25 UTCApr 17, 19:20 UTC1h 55m
2026-04-17 FIA5512 - Apr 17, 16:40 UTCApr 17, 17:15 UTC35m
2026-04-17 FIA5511 RMO → BCN Apr 17, 13:20 UTCApr 17, 14:55 UTC1h 35m
2026-04-17 FIA5511 RMO → BCN Apr 17, 11:55 UTCApr 17, 13:15 UTC1h 20m
2026-04-17 FIA6742 SSH → RMO Apr 17, 09:25 UTCApr 17, 10:10 UTC45m
2026-04-17 FIA6742 SSH → RMO Apr 17, 08:00 UTCApr 17, 09:15 UTC1h 15m
2026-04-17 FIA6741 RMO → SSH Apr 17, 05:20 UTCApr 17, 05:50 UTC30m

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?
No active broadcast right now. Last signal was 1h ago.
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 FIE533, FIA5512, FIA5511, FIA6343, FIA6344.