Apparatus

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sensors Mode-S transponder

4A2183

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-HLC · BOEING 737-800

Hex
4A2183
Octal
22420603
Decimal
4,858,243
Country
RO
Tail
YR-HLC
Type
B738
No current signal · last broadcast 3h ago
Flights observed
266
Distinct callsigns
19
Country
RO
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4A2183.

Country allocation

The ICAO 24-bit address 4A2183 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 19 distinct

Callsign Airline Flights Last seen
AEZ2119 Aerial Transit Company 38 2026-05-29
AEZ2114 Aerial Transit Company 37 2026-05-29
AEZ965S Aerial Transit Company 31 2026-05-29
AEZ2121 Aerial Transit Company 31 2026-05-29
AEZ2118 Aerial Transit Company 31 2026-05-29
AEZ218D - 30 2026-05-29
HLJ2EY - 15 2026-04-18
HLJ2VV - 14 2026-04-21
AEZ842T Aerial Transit Company 7 2026-05-17
AEZ168T Aerial Transit Company 7 2026-05-17
AEZ514C Aerial Transit Company 6 2026-05-17
AEZ155Z Aerial Transit Company 6 2026-05-17
HLJ2GJ - 4 2026-04-18
HLJ2953 - 3 2026-04-17
HLJ2954 - 2 2026-04-17
HLJ816F - 1 2026-04-22
HLJ3BF - 1 2026-04-20
AEZ7117 - 1 2026-04-23
AEZ60RG Aerial Transit Company 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AEZ2119 FCO → CIY May 29, 19:15 UTCMay 29, 20:05 UTC50m
2026-05-29 AEZ2118 CIY → FCO May 29, 16:55 UTCMay 29, 17:50 UTC55m
2026-05-29 AEZ2121 BGY → CIY May 29, 13:55 UTCMay 29, 15:25 UTC1h 30m
2026-05-29 AEZ965S CIY → BGY May 29, 10:15 UTCMay 29, 11:50 UTC1h 35m
2026-05-29 AEZ218D - May 29, 07:55 UTCMay 29, 08:55 UTC1h 0m
2026-05-29 AEZ2114 FCO → CIY May 29, 05:20 UTCMay 29, 06:20 UTC1h 0m
2026-05-28 AEZ2119 FCO → CIY May 28, 19:10 UTCMay 28, 20:00 UTC50m
2026-05-28 AEZ2118 CIY → FCO May 28, 16:50 UTCMay 28, 17:55 UTC1h 5m
2026-05-28 AEZ2121 BGY → CIY May 28, 13:45 UTCMay 28, 15:15 UTC1h 30m
2026-05-28 AEZ965S CIY → BGY May 28, 10:30 UTCMay 28, 12:00 UTC1h 30m
2026-05-28 AEZ218D - May 28, 07:55 UTCMay 28, 08:45 UTC50m
2026-05-28 AEZ2114 FCO → CIY May 28, 05:20 UTCMay 28, 06:25 UTC1h 5m
2026-05-27 AEZ2119 FCO → CIY May 27, 19:05 UTCMay 27, 20:00 UTC55m
2026-05-27 AEZ2118 CIY → FCO May 27, 16:45 UTCMay 27, 17:45 UTC1h 0m
2026-05-27 AEZ2121 BGY → CIY May 27, 13:45 UTCMay 27, 15:10 UTC1h 25m
2026-05-27 AEZ965S CIY → BGY May 27, 10:20 UTCMay 27, 11:45 UTC1h 25m
2026-05-27 AEZ218D - May 27, 07:50 UTCMay 27, 08:45 UTC55m
2026-05-27 AEZ2114 FCO → CIY May 27, 05:24 UTCMay 27, 06:20 UTC55m
2026-05-26 AEZ2119 FCO → CIY May 26, 19:10 UTCMay 26, 20:05 UTC55m
2026-05-26 AEZ2118 CIY → FCO May 26, 16:50 UTCMay 26, 17:50 UTC1h 0m
2026-05-26 AEZ2121 BGY → CIY May 26, 13:54 UTCMay 26, 15:24 UTC1h 30m
2026-05-26 AEZ965S CIY → BGY May 26, 10:20 UTCMay 26, 11:44 UTC1h 25m
2026-05-26 AEZ218D - May 26, 07:45 UTCMay 26, 08:45 UTC1h 0m
2026-05-26 AEZ2114 FCO → CIY May 26, 05:25 UTCMay 26, 06:25 UTC1h 0m
2026-05-25 AEZ2119 FCO → CIY May 25, 19:05 UTCMay 25, 19:59 UTC55m
2026-05-25 AEZ2118 CIY → FCO May 25, 16:40 UTCMay 25, 17:40 UTC1h 0m
2026-05-25 AEZ2121 BGY → CIY May 25, 13:40 UTCMay 25, 15:10 UTC1h 30m
2026-05-25 AEZ965S CIY → BGY May 25, 10:10 UTCMay 25, 11:40 UTC1h 30m
2026-05-25 AEZ218D - May 25, 08:00 UTCMay 25, 09:00 UTC1h 0m
2026-05-25 AEZ2114 FCO → CIY May 25, 05:20 UTCMay 25, 06:25 UTC1h 5m
2026-05-24 AEZ2119 FCO → CIY May 24, 19:15 UTCMay 24, 20:10 UTC55m
2026-05-24 AEZ2118 CIY → FCO May 24, 17:00 UTCMay 24, 17:55 UTC55m
2026-05-24 AEZ2121 BGY → CIY May 24, 13:50 UTCMay 24, 15:15 UTC1h 25m
2026-05-24 AEZ965S CIY → BGY May 24, 10:30 UTCMay 24, 12:05 UTC1h 35m
2026-05-24 AEZ218D - May 24, 08:05 UTCMay 24, 09:00 UTC55m
2026-05-24 AEZ2114 FCO → CIY May 24, 05:25 UTCMay 24, 06:25 UTC1h 0m
2026-05-23 AEZ2119 FCO → CIY May 23, 19:25 UTCMay 23, 20:20 UTC55m
2026-05-23 AEZ2118 CIY → FCO May 23, 16:35 UTCMay 23, 17:35 UTC1h 0m
2026-05-23 AEZ2121 BGY → CIY May 23, 13:45 UTCMay 23, 15:15 UTC1h 30m
2026-05-23 AEZ965S CIY → BGY May 23, 10:35 UTCMay 23, 12:05 UTC1h 30m
2026-05-23 AEZ218D - May 23, 07:55 UTCMay 23, 08:50 UTC55m
2026-05-23 AEZ2114 FCO → CIY May 23, 05:25 UTCMay 23, 06:25 UTC1h 0m
2026-05-22 AEZ2119 FCO → CIY May 22, 19:10 UTCMay 22, 20:05 UTC55m
2026-05-22 AEZ2118 CIY → FCO May 22, 16:40 UTCMay 22, 17:45 UTC1h 5m
2026-05-22 AEZ2121 BGY → CIY May 22, 13:35 UTCMay 22, 15:10 UTC1h 35m
2026-05-22 AEZ965S CIY → BGY May 22, 10:25 UTCMay 22, 11:55 UTC1h 30m
2026-05-22 AEZ218D - May 22, 07:50 UTCMay 22, 08:45 UTC55m
2026-05-22 AEZ2114 FCO → CIY May 22, 05:25 UTCMay 22, 06:25 UTC1h 0m
2026-05-21 AEZ2119 FCO → CIY May 21, 19:05 UTCMay 21, 20:00 UTC55m
2026-05-21 AEZ2118 CIY → FCO May 21, 16:40 UTCMay 21, 17:40 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-HLC page for operator, model, and routing details .

Mode-S 4A2183 frequently asked

What is Mode-S code 4A2183?
4A2183 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-HLC.
Where is Mode-S 4A2183 registered?
Mode-S code 4A2183 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A2183 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A2183, octal 22420603, decimal 4,858,243.
What flights does 4A2183 operate?
Mode-S 4A2183 has broadcast 19 distinct callsigns, including AEZ2119, AEZ2114, AEZ965S, AEZ2121, AEZ2118.