Apparatus

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sensors Mode-S transponder

4A1923

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-FIC · AIRBUS A-321

Hex
4A1923
Octal
22414443
Decimal
4,856,099
Country
RO
Tail
YR-FIC
Type
A321
No current signal · last broadcast 17h ago
Flights observed
153
Distinct callsigns
20
Country
RO
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 4A1923.

Country allocation

The ICAO 24-bit address 4A1923 falls within the block assigned to Romania (RO) by ICAO Annex 10, Volume III. Every aircraft registered in Romania 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
FOE8442 - 12 2026-07-05
FOE8441 - 12 2026-07-05
FOE8361 - 10 2026-07-04
FOE8362 - 8 2026-07-04
FOE7502 - 8 2026-07-06
FOE7501 - 8 2026-07-06
BNL101 - 8 2026-07-17
BNL104 - 7 2026-07-15
BNL103 - 7 2026-07-15
BNL303 - 6 2026-04-19
BNL102 - 6 2026-07-17
FOE8350 - 5 2026-07-04
FOE8349 - 5 2026-07-04
BNL304 Blue Nile Ethiopia Trading 5 2026-04-19
BNL451 - 4 2026-07-14
FOE8514 - 3 2026-06-30
FOE8513 - 3 2026-06-30
FOE8404 - 3 2026-06-29
FOE8403 - 3 2026-06-29
FOE8348 - 3 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 BNL400 - Jul 17, 13:05 UTCJul 17, 13:15 UTC10m
2026-07-17 BNL102 - Jul 17, 09:45 UTCJul 17, 11:04 UTC1h 20m
2026-07-17 BNL101 - Jul 17, 07:05 UTCJul 17, 08:00 UTC55m
2026-07-16 BML236 MJI → BEN Jul 16, 22:55 UTCJul 16, 23:59 UTC1h 5m
2026-07-16 BNL235 BEN → MJI Jul 16, 19:45 UTCJul 16, 20:49 UTC1h 5m
2026-07-16 BNL102 - Jul 16, 16:15 UTCJul 16, 17:35 UTC1h 20m
2026-07-16 BNL121 - Jul 16, 13:30 UTCJul 16, 14:15 UTC45m
2026-07-16 BNL122 - Jul 16, 10:55 UTCJul 16, 11:45 UTC50m
2026-07-16 BNL101 - Jul 16, 07:10 UTCJul 16, 08:25 UTC1h 15m
2026-07-15 BNL104 TUN → BEN Jul 15, 21:15 UTCJul 15, 22:40 UTC1h 25m
2026-07-15 BNL103 - Jul 15, 16:40 UTCJul 15, 18:00 UTC1h 20m
2026-07-15 BNL1501 - Jul 15, 06:10 UTCJul 15, 11:45 UTC5h 35m
2026-07-14 BNL104 - Jul 14, 19:50 UTCJul 14, 21:05 UTC1h 15m
2026-07-14 BNL103 - Jul 14, 16:45 UTCJul 14, 18:20 UTC1h 35m
2026-07-14 BNL451 - Jul 14, 11:10 UTCJul 14, 11:45 UTC35m
2026-07-13 BNL104 - Jul 13, 19:55 UTCJul 13, 21:25 UTC1h 30m
2026-07-13 BNL103 - Jul 13, 16:40 UTCJul 13, 18:05 UTC1h 25m
2026-07-13 BNL1512 - Jul 13, 11:35 UTCJul 13, 12:15 UTC40m
2026-07-12 BNL104 - Jul 12, 19:55 UTCJul 12, 21:20 UTC1h 25m
2026-07-12 BNL103 - Jul 12, 16:45 UTCJul 12, 18:01 UTC1h 15m
2026-07-12 BNL451 - Jul 12, 13:25 UTCJul 12, 13:30 UTC5m
2026-07-11 BNL451 - Jul 11, 20:20 UTCJul 11, 20:50 UTC30m
2026-07-11 BNL450 - Jul 11, 18:15 UTCJul 11, 18:25 UTC10m
2026-07-11 BNL102 - Jul 11, 09:40 UTCJul 11, 10:45 UTC1h 5m
2026-07-11 BNL101 - Jul 11, 06:50 UTCJul 11, 08:05 UTC1h 15m
2026-07-10 BNL104 - Jul 10, 19:35 UTCJul 10, 21:05 UTC1h 30m
2026-07-10 BNL102 - Jul 10, 09:35 UTCJul 10, 18:05 UTC8h 30m
2026-07-10 BNL101 - Jul 10, 06:45 UTCJul 10, 07:45 UTC1h 0m
2026-07-09 BNL451 - Jul 9, 11:00 UTCJul 9, 11:15 UTC15m
2026-07-08 BNL1902 OTP → BEN Jul 8, 13:35 UTCJul 8, 15:55 UTC2h 20m
2026-07-06 FOE7502 - Jul 6, 08:30 UTCJul 6, 10:40 UTC2h 10m
2026-07-06 FOE7501 - Jul 6, 04:30 UTCJul 6, 07:05 UTC2h 35m
2026-07-05 FOE8442 - Jul 5, 04:50 UTCJul 5, 06:15 UTC1h 25m
2026-07-05 FOE8441 - Jul 5, 01:50 UTCJul 5, 03:20 UTC1h 30m
2026-07-04 FOE8442 - Jul 4, 18:20 UTCJul 4, 19:50 UTC1h 30m
2026-07-04 FOE8441 - Jul 4, 15:20 UTCJul 4, 17:05 UTC1h 45m
2026-07-04 FOE8362 - Jul 4, 12:20 UTCJul 4, 13:55 UTC1h 35m
2026-07-04 FOE8349 - Jul 4, 08:40 UTCJul 4, 10:15 UTC1h 35m
2026-07-04 FOE8350 - Jul 4, 05:25 UTCJul 4, 07:15 UTC1h 50m
2026-07-04 FOE8361 - Jul 4, 02:15 UTCJul 4, 03:40 UTC1h 25m
2026-07-03 FOE7502 - Jul 3, 18:20 UTCJul 3, 20:30 UTC2h 10m
2026-07-03 FOE7501 - Jul 3, 14:20 UTCJul 3, 16:50 UTC2h 30m
2026-07-03 FOE8362 - Jul 3, 11:40 UTCJul 3, 13:05 UTC1h 25m
2026-07-03 FOE8347 - Jul 3, 08:35 UTCJul 3, 10:15 UTC1h 40m
2026-07-03 FOE8348 - Jul 3, 05:10 UTCJul 3, 06:50 UTC1h 40m
2026-07-03 FOE8361 OTP → AYT Jul 3, 02:05 UTCJul 3, 03:45 UTC1h 40m
2026-07-02 AWG611 - Jul 2, 12:45 UTCJul 2, 15:10 UTC2h 25m
2026-07-02 AWG610 - Jul 2, 08:45 UTCJul 2, 11:15 UTC2h 30m
2026-07-02 FOE8442 - Jul 2, 06:00 UTCJul 2, 07:20 UTC1h 20m
2026-07-02 FOE8441 - Jul 2, 03:10 UTCJul 2, 04:40 UTC1h 30m

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 YR-FIC page for operator, model, and routing details .

Mode-S 4A1923 frequently asked

What is Mode-S code 4A1923?
4A1923 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-FIC.
Where is Mode-S 4A1923 registered?
Mode-S code 4A1923 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A1923 broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A1923, octal 22414443, decimal 4,856,099.
What flights does 4A1923 operate?
Mode-S 4A1923 has broadcast 20 distinct callsigns, including FOE8442, FOE8441, FOE8361, FOE8362, FOE7502.