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sensors Mode-S transponder

4A3499

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-MDY · TECNAM P-2008

Hex
4A3499
Octal
22432231
Decimal
4,863,129
Country
RO
Tail
YR-MDY
Type
P208
No current signal · last broadcast Jul 23, 19:25 UTC
Flights observed
66
Distinct callsigns
1
Country
RO
Last broadcast
Jul 23, 19:25 UTC

Last known position

Most recent position reported by Mode-S 4A3499.

Country allocation

The ICAO 24-bit address 4A3499 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
YRMDY - 66 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 YRMDY - Jul 23, 16:10 UTCJul 23, 19:25 UTC3h 15m
2026-07-23 YRMDY - Jul 23, 09:10 UTCJul 23, 10:05 UTC55m
2026-07-23 YRMDY - Jul 23, 05:25 UTCJul 23, 07:15 UTC1h 50m
2026-07-22 YRMDY - Jul 22, 13:10 UTCJul 22, 15:00 UTC1h 50m
2026-07-21 YRMDY - Jul 21, 16:10 UTCJul 21, 20:25 UTC4h 15m
2026-07-16 YRMDY - Jul 16, 16:05 UTCJul 16, 20:05 UTC4h 0m
2026-07-15 YRMDY - Jul 15, 16:10 UTCJul 15, 20:00 UTC3h 50m
2026-07-14 YRMDY - Jul 14, 19:40 UTCJul 14, 19:50 UTC10m
2026-07-14 YRMDY - Jul 14, 17:00 UTCJul 14, 19:00 UTC2h 0m
2026-07-14 YRMDY - Jul 14, 16:10 UTCJul 14, 16:20 UTC10m
2026-06-18 YRMDY - Jun 18, 08:40 UTCJun 18, 11:45 UTC3h 5m
2026-06-18 YRMDY - Jun 18, 07:35 UTCJun 18, 08:10 UTC35m
2026-06-18 YRMDY - Jun 18, 05:35 UTCJun 18, 06:55 UTC1h 20m
2026-06-17 YRMDY - Jun 17, 07:45 UTCJun 17, 09:05 UTC1h 20m
2026-06-17 YRMDY - Jun 17, 05:20 UTCJun 17, 07:05 UTC1h 45m
2026-06-16 YRMDY - Jun 16, 09:15 UTCJun 16, 10:04 UTC50m
2026-06-16 YRMDY - Jun 16, 06:50 UTCJun 16, 07:45 UTC55m
2026-06-16 YRMDY - Jun 16, 05:30 UTCJun 16, 06:20 UTC50m
2026-06-15 YRMDY - Jun 15, 09:15 UTCJun 15, 10:24 UTC1h 10m
2026-06-15 YRMDY - Jun 15, 07:29 UTCJun 15, 08:29 UTC1h 0m
2026-06-15 YRMDY - Jun 15, 05:15 UTCJun 15, 06:49 UTC1h 35m
2026-06-11 YRMDY - Jun 11, 08:20 UTCJun 11, 09:30 UTC1h 10m
2026-06-11 YRMDY - Jun 11, 05:15 UTCJun 11, 06:10 UTC55m
2026-06-10 YRMDY - Jun 10, 06:35 UTCJun 10, 08:10 UTC1h 35m
2026-06-10 YRMDY - Jun 10, 05:15 UTCJun 10, 06:05 UTC50m
2026-06-09 YRMDY - Jun 9, 05:40 UTCJun 9, 07:25 UTC1h 45m
2026-06-08 YRMDY - Jun 8, 10:35 UTCJun 8, 11:25 UTC50m
2026-06-08 YRMDY - Jun 8, 09:20 UTCJun 8, 09:50 UTC30m
2026-06-05 YRMDY - Jun 5, 10:55 UTCJun 5, 11:05 UTC10m
2026-06-03 YRMDY - Jun 3, 07:35 UTCJun 3, 08:30 UTC55m
2026-06-03 YRMDY - Jun 3, 05:30 UTCJun 3, 06:35 UTC1h 5m
2026-05-25 YRMDY - May 25, 07:10 UTCMay 25, 08:35 UTC1h 25m
2026-05-25 YRMDY - May 25, 06:15 UTCMay 25, 06:25 UTC10m
2026-05-25 YRMDY - May 25, 05:25 UTCMay 25, 05:40 UTC15m
2026-05-19 YRMDY - May 19, 08:50 UTCMay 19, 09:30 UTC40m
2026-05-19 YRMDY - May 19, 05:30 UTCMay 19, 07:45 UTC2h 15m
2026-05-15 YRMDY - May 15, 07:40 UTCMay 15, 09:10 UTC1h 30m
2026-05-15 YRMDY - May 15, 05:10 UTCMay 15, 07:00 UTC1h 50m
2026-05-13 YRMDY - May 13, 05:40 UTCMay 13, 07:30 UTC1h 50m
2026-04-28 YRMDY - Apr 28, 05:35 UTCApr 28, 06:00 UTC25m
2026-04-27 YRMDY - Apr 27, 09:15 UTCApr 27, 09:55 UTC40m
2026-04-27 YRMDY - Apr 27, 06:10 UTCApr 27, 06:50 UTC40m
2026-04-24 YRMDY - Apr 24, 09:25 UTCApr 24, 10:10 UTC45m
2026-04-24 YRMDY - Apr 24, 06:05 UTCApr 24, 06:50 UTC45m
2026-04-23 YRMDY - Apr 23, 13:15 UTCApr 23, 14:35 UTC1h 20m
2026-04-23 YRMDY - Apr 23, 10:01 UTCApr 23, 12:15 UTC2h 15m
2026-04-22 YRMDY - Apr 22, 10:40 UTCApr 22, 10:50 UTC10m
2026-04-22 YRMDY - Apr 22, 07:15 UTCApr 22, 08:50 UTC1h 35m
2026-04-22 YRMDY - Apr 22, 05:10 UTCApr 22, 06:20 UTC1h 10m
2026-04-21 YRMDY - Apr 21, 10:25 UTCApr 21, 11:20 UTC55m

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-MDY page for operator, model, and routing details .

Mode-S 4A3499 frequently asked

What is Mode-S code 4A3499?
4A3499 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-MDY.
Where is Mode-S 4A3499 registered?
Mode-S code 4A3499 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A3499 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 19:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A3499, octal 22432231, decimal 4,863,129.
What flights does 4A3499 operate?
Mode-S 4A3499 has broadcast 1 distinct callsign, including YRMDY.