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sensors Mode-S transponder

4A2184

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-HLD · BOEING 737-800

Hex
4A2184
Octal
22420604
Decimal
4,858,244
Country
RO
Tail
YR-HLD
Type
B738
No current signal · last broadcast 10h ago
Flights observed
285
Distinct callsigns
20
Country
RO
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 4A2184.

Country allocation

The ICAO 24-bit address 4A2184 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
AEZ965S - 23 2026-07-12
AEZ2118 - 22 2026-07-12
AEZ218D - 21 2026-07-12
AEZ2121 - 21 2026-07-12
AEZ2119 - 21 2026-06-21
AEZ2114 - 20 2026-06-22
AEZ842V - 15 2026-07-13
AEZ2364 - 15 2026-07-13
AEZ69FS - 13 2026-07-13
AEZ75HH - 12 2026-07-13
AEZ8765 - 11 2026-07-13
AEZ94GL - 9 2026-07-13
AEZ836S - 8 2026-07-13
AEZ8041 - 8 2026-07-10
AEZ48LG - 8 2026-07-10
AEZ38TM - 8 2026-07-13
AEZ112X - 7 2026-07-09
AEZ81GR - 6 2026-07-09
AEZ2349 - 6 2026-07-12
AEZ842T Aerial Transit Company 4 2026-04-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AEZ842V - Jul 13, 20:05 UTCJul 13, 20:55 UTC50m
2026-07-13 AEZ2364 - Jul 13, 18:05 UTCJul 13, 19:00 UTC55m
2026-07-13 AEZ69FS - Jul 13, 15:50 UTCJul 13, 16:45 UTC55m
2026-07-13 AEZ75HH - Jul 13, 13:40 UTCJul 13, 14:35 UTC55m
2026-07-13 AEZ8765 - Jul 13, 11:25 UTCJul 13, 12:15 UTC50m
2026-07-13 AEZ38TM - Jul 13, 09:15 UTCJul 13, 10:00 UTC45m
2026-07-13 AEZ836S - Jul 13, 07:15 UTCJul 13, 08:05 UTC50m
2026-07-13 AEZ94GL - Jul 13, 05:15 UTCJul 13, 06:15 UTC1h 0m
2026-07-12 AEZ2349 - Jul 12, 20:30 UTCJul 12, 21:05 UTC35m
2026-07-12 AEZ2118 - Jul 12, 16:45 UTCJul 12, 17:45 UTC1h 0m
2026-07-12 AEZ2121 - Jul 12, 13:45 UTCJul 12, 15:10 UTC1h 25m
2026-07-12 AEZ965S - Jul 12, 10:15 UTCJul 12, 11:50 UTC1h 35m
2026-07-12 AEZ218D - Jul 12, 07:45 UTCJul 12, 08:40 UTC55m
2026-07-12 AEZ20GR - Jul 12, 05:50 UTCJul 12, 06:35 UTC45m
2026-07-11 AEZ842V - Jul 11, 21:20 UTCJul 11, 22:25 UTC1h 5m
2026-07-11 AEZ2364 - Jul 11, 19:15 UTCJul 11, 20:20 UTC1h 5m
2026-07-11 AEZ69FS LIN → DCI Jul 11, 17:05 UTCJul 11, 18:05 UTC1h 0m
2026-07-11 AEZ75HH - Jul 11, 15:00 UTCJul 11, 16:05 UTC1h 5m
2026-07-11 AEZ8765 - Jul 11, 12:30 UTCJul 11, 13:30 UTC1h 0m
2026-07-11 AEZ38TM - Jul 11, 09:50 UTCJul 11, 10:35 UTC45m
2026-07-11 AEZ836S - Jul 11, 07:15 UTCJul 11, 08:01 UTC45m
2026-07-11 AEZ94GL - Jul 11, 05:15 UTCJul 11, 06:10 UTC55m
2026-07-10 AEZ842V - Jul 10, 21:10 UTCJul 10, 22:10 UTC1h 0m
2026-07-10 AEZ2364 - Jul 10, 18:55 UTCJul 10, 20:00 UTC1h 5m
2026-07-10 AEZ69FS - Jul 10, 16:40 UTCJul 10, 17:45 UTC1h 5m
2026-07-10 AEZ75HH - Jul 10, 14:20 UTCJul 10, 15:20 UTC1h 0m
2026-07-10 AEZ8765 - Jul 10, 11:40 UTCJul 10, 12:35 UTC55m
2026-07-10 AEZ41ST - Jul 10, 09:25 UTCJul 10, 10:25 UTC1h 0m
2026-07-10 AEZ8041 - Jul 10, 06:25 UTCJul 10, 07:40 UTC1h 15m
2026-07-10 AEZ48LG - Jul 10, 04:10 UTCJul 10, 05:05 UTC55m
2026-07-09 AEZ842V - Jul 9, 20:15 UTCJul 9, 21:10 UTC55m
2026-07-09 AEZ2364 - Jul 9, 18:20 UTCJul 9, 19:15 UTC55m
2026-07-09 AEZ69FS - Jul 9, 16:10 UTCJul 9, 17:00 UTC50m
2026-07-09 AEZ75HH - Jul 9, 14:15 UTCJul 9, 15:10 UTC55m
2026-07-09 AEZ112X - Jul 9, 12:10 UTCJul 9, 12:50 UTC40m
2026-07-09 AEZ81GR - Jul 9, 08:30 UTCJul 9, 09:15 UTC45m
2026-07-09 AEZ8041 - Jul 9, 06:25 UTCJul 9, 07:20 UTC55m
2026-07-09 AEZ48LG - Jul 9, 04:25 UTCJul 9, 05:20 UTC55m
2026-07-08 AEZ842V - Jul 8, 21:15 UTCJul 8, 22:10 UTC55m
2026-07-08 AEZ2364 - Jul 8, 19:05 UTCJul 8, 20:05 UTC1h 0m
2026-07-08 AEZ69FS - Jul 8, 16:50 UTCJul 8, 17:50 UTC1h 0m
2026-07-08 AEZ75HH CAG → LIN Jul 8, 14:30 UTCJul 8, 15:40 UTC1h 10m
2026-07-08 AEZ8765 - Jul 8, 11:40 UTCJul 8, 12:40 UTC1h 0m
2026-07-08 AEZ38TM OLB → LIN Jul 8, 09:05 UTCJul 8, 09:55 UTC50m
2026-07-08 AEZ836S LIN → OLB Jul 8, 07:20 UTCJul 8, 08:10 UTC50m
2026-07-08 AEZ94GL - Jul 8, 05:15 UTCJul 8, 06:20 UTC1h 5m
2026-07-07 AEZ842V - Jul 7, 20:40 UTCJul 7, 21:45 UTC1h 5m
2026-07-07 AEZ2364 - Jul 7, 18:30 UTCJul 7, 19:30 UTC1h 0m
2026-07-07 AEZ69FS - Jul 7, 16:10 UTCJul 7, 17:00 UTC50m
2026-07-07 AEZ75HH - Jul 7, 14:00 UTCJul 7, 15:00 UTC1h 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 YR-HLD page for operator, model, and routing details .

Mode-S 4A2184 frequently asked

What is Mode-S code 4A2184?
4A2184 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-HLD.
Where is Mode-S 4A2184 registered?
Mode-S code 4A2184 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A2184 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A2184, octal 22420604, decimal 4,858,244.
What flights does 4A2184 operate?
Mode-S 4A2184 has broadcast 20 distinct callsigns, including AEZ965S, AEZ2118, AEZ218D, AEZ2121, AEZ2119.