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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 10h ago
Flights observed
403
Distinct callsigns
20
Country
RO
Last broadcast
10h 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 20 distinct

Callsign Airline Flights Last seen
AEZ2119 Aerial Transit Company 51 2026-06-11
AEZ2114 - 50 2026-06-12
AEZ965S Aerial Transit Company 45 2026-06-12
AEZ2121 Aerial Transit Company 45 2026-06-12
AEZ2118 Aerial Transit Company 45 2026-06-12
AEZ218D - 44 2026-06-12
HLJ2EY - 21 2026-07-13
HLJ2VV - 20 2026-07-13
HLJ3BF - 10 2026-07-11
AEZ842T Aerial Transit Company 7 2026-05-17
AEZ168T Aerial Transit Company 7 2026-05-17
HLJ2GJ - 6 2026-07-09
AEZ514C Aerial Transit Company 6 2026-05-17
AEZ155Z Aerial Transit Company 6 2026-05-17
HLJ4AB - 5 2026-07-12
HLJ1025 - 5 2026-07-11
HLJ1GL - 4 2026-07-10
HLJ1AM - 4 2026-07-10
HLJ2953 - 3 2026-04-17
HLJ1024 - 3 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 HLJ2VV - Jul 13, 12:20 UTCJul 13, 14:55 UTC2h 35m
2026-07-13 HLJ2EY - Jul 13, 05:10 UTCJul 13, 12:05 UTC6h 55m
2026-07-12 HLJ4AB PRG → PRG Jul 12, 05:45 UTCJul 12, 14:55 UTC9h 10m
2026-07-11 HLJ3BF - Jul 11, 05:31 UTCJul 11, 15:15 UTC9h 45m
2026-07-11 HLJ1025 - Jul 11, 01:25 UTCJul 11, 04:05 UTC2h 40m
2026-07-10 HLJ1024 - Jul 10, 18:15 UTCJul 11, 01:20 UTC7h 5m
2026-07-10 HLJ1AM - Jul 10, 08:05 UTCJul 10, 10:00 UTC1h 55m
2026-07-10 HLJ1GL - Jul 10, 05:15 UTCJul 10, 06:45 UTC1h 30m
2026-07-09 HLJ2GJ PED → PRG Jul 9, 17:45 UTCJul 10, 03:50 UTC10h 5m
2026-07-09 HLJ2TT PRG → PED Jul 9, 05:20 UTCJul 9, 15:15 UTC9h 55m
2026-07-08 HLJ3BF PRG → PRG Jul 8, 05:35 UTCJul 8, 14:50 UTC9h 15m
2026-07-07 HLJ1024 PRG → PRG Jul 7, 17:55 UTCJul 8, 04:05 UTC10h 10m
2026-07-07 HLJ1AM - Jul 7, 14:05 UTCJul 7, 16:00 UTC1h 55m
2026-07-07 HLJ5TS PED → BOJ Jul 7, 11:30 UTCJul 7, 13:05 UTC1h 35m
2026-07-07 HLJ3WT - Jul 7, 08:05 UTCJul 7, 09:55 UTC1h 50m
2026-07-07 HLJ1GL - Jul 7, 05:10 UTCJul 7, 06:50 UTC1h 40m
2026-07-06 HLJ2VV - Jul 6, 05:20 UTCJul 6, 15:05 UTC9h 45m
2026-07-05 HLJ3BF - Jul 5, 12:30 UTCJul 5, 15:15 UTC2h 45m
2026-07-05 HLJ4AB - Jul 5, 05:30 UTCJul 5, 12:20 UTC6h 50m
2026-07-04 HLJ3BF PRG → PRG Jul 4, 05:20 UTCJul 4, 14:55 UTC9h 35m
2026-07-03 HLJ1025 PRG → PRG Jul 3, 18:30 UTCJul 4, 04:10 UTC9h 40m
2026-07-03 HLJ1AM - Jul 3, 08:15 UTCJul 3, 10:05 UTC1h 50m
2026-07-03 HLJ1GL - Jul 3, 05:10 UTCJul 3, 06:50 UTC1h 40m
2026-07-02 HLJ2GJ - Jul 2, 17:30 UTCJul 3, 03:40 UTC10h 10m
2026-07-02 HLJ2TT PRG → PED Jul 2, 05:15 UTCJul 2, 15:10 UTC9h 55m
2026-07-01 HLJ2EY PRG → PRG Jul 1, 04:20 UTCJul 1, 15:10 UTC10h 50m
2026-06-30 HLJ2EY PRG → PRG Jun 30, 05:20 UTCJun 30, 15:05 UTC9h 45m
2026-06-29 HLJ2EY PRG → PRG Jun 29, 05:09 UTCJun 29, 14:39 UTC9h 30m
2026-06-28 HLJ4AB PRG → PRG Jun 28, 05:34 UTCJun 28, 15:05 UTC9h 30m
2026-06-27 HLJ3HJ PRG → PRG Jun 27, 18:39 UTCJun 28, 03:59 UTC9h 20m
2026-06-27 HLJ4AB PRG → PRG Jun 27, 05:10 UTCJun 27, 14:45 UTC9h 35m
2026-06-26 HLJ1024 PRG → PRG Jun 26, 18:29 UTCJun 27, 03:40 UTC9h 10m
2026-06-26 HLJ1AM - Jun 26, 08:24 UTCJun 26, 10:10 UTC1h 45m
2026-06-26 HLJ1GL - Jun 26, 05:24 UTCJun 26, 07:05 UTC1h 40m
2026-06-25 HLJ4AB PRG → PRG Jun 25, 18:29 UTCJun 26, 04:00 UTC9h 30m
2026-06-25 HLJ155 RHO → PRG Jun 25, 09:40 UTCJun 25, 12:15 UTC2h 35m
2026-06-25 HLJ154 PRG → RHO Jun 25, 05:20 UTCJun 25, 07:54 UTC2h 35m
2026-06-24 HLJ2VV - Jun 24, 17:40 UTCJun 24, 20:44 UTC3h 5m
2026-06-24 HLJ2EY - Jun 24, 09:00 UTCJun 24, 11:34 UTC2h 35m
2026-06-23 HLJ1025 PRG → PRG Jun 23, 17:50 UTCJun 24, 03:50 UTC10h 0m
2026-06-23 HLJ2VV PRG → PRG Jun 23, 05:15 UTCJun 23, 14:59 UTC9h 45m
2026-06-22 HLJ2VV PRG → PRG Jun 22, 05:10 UTCJun 22, 15:10 UTC10h 0m
2026-06-21 HLJ3BF PRG → PRG Jun 21, 05:30 UTCJun 21, 15:15 UTC9h 45m
2026-06-20 HLJ3BF PRG → PRG Jun 20, 05:24 UTCJun 20, 14:50 UTC9h 25m
2026-06-19 HLJ1025 PRG → PRG Jun 19, 18:20 UTCJun 20, 04:09 UTC9h 50m
2026-06-18 HLJ1025 PRG → PRG Jun 18, 18:50 UTCJun 19, 04:25 UTC9h 34m
2026-06-18 HLJ155 RHO → PRG Jun 18, 09:25 UTCJun 18, 12:05 UTC2h 40m
2026-06-18 HLJ154 PRG → RHO Jun 18, 05:15 UTCJun 18, 07:50 UTC2h 35m
2026-06-17 HLJ2EY PRG → PRG Jun 17, 04:30 UTCJun 17, 14:45 UTC10h 15m
2026-06-16 HLJ2VV PRG → PRG Jun 16, 04:35 UTCJun 16, 14:30 UTC9h 55m

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 10h 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 20 distinct callsigns, including AEZ2119, AEZ2114, AEZ965S, AEZ2121, AEZ2118.