Apparatus

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sensors Mode-S transponder

4A503A

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-TAZ · ROBINSON R-22 Mariner

Hex
4A503A
Octal
22450072
Decimal
4,870,202
Country
RO
Tail
YR-TAZ
Type
R22
No current signal · last broadcast 1h ago
Flights observed
75
Distinct callsigns
1
Country
RO
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4A503A.

Country allocation

The ICAO 24-bit address 4A503A 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 1 distinct

Callsign Airline Flights Last seen
YRTAZ - 75 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-27 YRTAZ - Jun 27, 17:25 UTCJun 27, 17:55 UTC30m
2026-06-27 YRTAZ - Jun 27, 10:54 UTCJun 27, 11:20 UTC25m
2026-06-27 YRTAZ - Jun 27, 05:29 UTCJun 27, 07:24 UTC1h 55m
2026-06-27 YRTAZ - Jun 27, 03:55 UTCJun 27, 04:49 UTC55m
2026-06-26 YRTAZ - Jun 26, 15:39 UTCJun 26, 16:09 UTC30m
2026-06-26 YRTAZ - Jun 26, 06:09 UTCJun 26, 09:10 UTC3h 0m
2026-06-25 YRTAZ - Jun 25, 15:59 UTCJun 25, 17:09 UTC1h 10m
2026-06-25 YRTAZ - Jun 25, 06:50 UTCJun 25, 09:45 UTC2h 55m
2026-06-21 YRTAZ - Jun 21, 15:09 UTCJun 21, 15:19 UTC10m
2026-06-21 YRTAZ - Jun 21, 05:25 UTCJun 21, 05:35 UTC10m
2026-06-20 YRTAZ - Jun 20, 11:44 UTCJun 20, 12:14 UTC30m
2026-06-17 YRTAZ - Jun 17, 17:30 UTCJun 17, 17:55 UTC25m
2026-06-16 YRTAZ - Jun 16, 10:09 UTCJun 16, 10:40 UTC30m
2026-06-12 YRTAZ - Jun 12, 06:35 UTCJun 12, 06:45 UTC10m
2026-06-11 YRTAZ - Jun 11, 15:20 UTCJun 11, 16:10 UTC50m
2026-06-10 YRTAZ - Jun 10, 17:30 UTCJun 10, 17:40 UTC10m
2026-06-10 YRTAZ - Jun 10, 16:05 UTCJun 10, 16:35 UTC30m
2026-06-10 YRTAZ - Jun 10, 13:00 UTCJun 10, 13:10 UTC10m
2026-06-10 YRTAZ - Jun 10, 11:30 UTCJun 10, 11:50 UTC20m
2026-06-09 YRTAZ - Jun 9, 13:55 UTCJun 9, 14:25 UTC30m
2026-06-09 YRTAZ - Jun 9, 13:05 UTCJun 9, 13:15 UTC10m
2026-06-09 YRTAZ - Jun 9, 09:20 UTCJun 9, 09:30 UTC10m
2026-06-09 YRTAZ - Jun 9, 07:40 UTCJun 9, 08:00 UTC20m
2026-06-09 YRTAZ - Jun 9, 05:35 UTCJun 9, 06:25 UTC50m
2026-06-08 YRTAZ - Jun 8, 16:40 UTCJun 8, 17:15 UTC35m
2026-06-08 YRTAZ - Jun 8, 15:30 UTCJun 8, 15:55 UTC25m
2026-06-08 YRTAZ - Jun 8, 12:15 UTCJun 8, 12:40 UTC25m
2026-06-08 YRTAZ - Jun 8, 10:05 UTCJun 8, 10:35 UTC30m
2026-06-08 YRTAZ - Jun 8, 08:05 UTCJun 8, 08:40 UTC35m
2026-06-08 YRTAZ - Jun 8, 05:25 UTCJun 8, 06:10 UTC45m
2026-06-07 YRTAZ - Jun 7, 13:00 UTCJun 7, 14:00 UTC1h 0m
2026-06-07 YRTAZ - Jun 7, 11:05 UTCJun 7, 11:55 UTC50m
2026-06-07 YRTAZ - Jun 7, 06:25 UTCJun 7, 06:50 UTC25m
2026-06-07 YRTAZ - Jun 7, 05:10 UTCJun 7, 05:35 UTC25m
2026-06-06 YRTAZ - Jun 6, 04:20 UTCJun 6, 04:30 UTC10m
2026-06-05 YRTAZ - Jun 5, 13:20 UTCJun 5, 14:25 UTC1h 5m
2026-06-05 YRTAZ - Jun 5, 08:50 UTCJun 5, 09:20 UTC30m
2026-06-05 YRTAZ - Jun 5, 06:50 UTCJun 5, 07:40 UTC50m
2026-06-04 YRTAZ - Jun 4, 13:40 UTCJun 4, 14:35 UTC55m
2026-06-04 YRTAZ - Jun 4, 05:00 UTCJun 4, 05:15 UTC15m
2026-06-03 YRTAZ - Jun 3, 16:05 UTCJun 3, 16:15 UTC10m
2026-06-03 YRTAZ - Jun 3, 11:25 UTCJun 3, 11:55 UTC30m
2026-06-03 YRTAZ - Jun 3, 07:15 UTCJun 3, 09:35 UTC2h 20m
2026-06-02 YRTAZ - Jun 2, 13:55 UTCJun 2, 14:15 UTC20m
2026-06-02 YRTAZ - Jun 2, 12:00 UTCJun 2, 13:05 UTC1h 5m
2026-06-02 YRTAZ - Jun 2, 08:15 UTCJun 2, 09:30 UTC1h 15m
2026-05-30 YRTAZ - May 30, 17:25 UTCMay 30, 17:55 UTC30m
2026-05-30 YRTAZ - May 30, 09:40 UTCMay 30, 10:20 UTC40m
2026-05-29 YRTAZ - May 29, 11:15 UTCMay 29, 11:45 UTC30m
2026-05-29 YRTAZ - May 29, 07:55 UTCMay 29, 09:25 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-TAZ page for operator, model, and routing details .

Mode-S 4A503A frequently asked

What is Mode-S code 4A503A?
4A503A is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-TAZ.
Where is Mode-S 4A503A registered?
Mode-S code 4A503A is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A503A 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 4A503A, octal 22450072, decimal 4,870,202.
What flights does 4A503A operate?
Mode-S 4A503A has broadcast 1 distinct callsign, including YRTAZ.