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sensors Mode-S transponder

4A4D79

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-SKY · AIRBUS A-320

Hex
4A4D79
Octal
22446571
Decimal
4,869,497
Country
RO
Tail
YR-SKY
Type
A320
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
546
Distinct callsigns
20
Country
RO
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S 4A4D79.

Country allocation

The ICAO 24-bit address 4A4D79 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
HYS474 - 24 2026-07-12
HYS473 - 24 2026-07-11
HYS243 - 15 2026-06-29
HYS244 - 14 2026-06-29
HYS256 HiSky Europe 13 2026-07-26
HYS255 HiSky Europe 13 2026-07-26
HYM458 - 13 2026-07-08
HYS276 HiSky Europe 12 2026-07-24
HYS275 HiSky Europe 12 2026-07-24
HYM457 - 11 2026-07-08
HYS254 HiSky Europe 10 2026-07-24
HYS253 HiSky Europe 10 2026-07-24
HYS762 HiSky Europe 9 2026-07-25
HYS481 - 8 2026-06-30
HYS278 - 8 2026-07-21
HYM347 - 8 2026-06-25
HYM345 - 8 2026-06-26
HYM316 - 8 2026-06-26
HYS761 HiSky Europe 7 2026-07-25
HYS482 - 7 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HYS257 OTP → DUB Jul 26, 17:50 UTCJul 26, 21:40 UTC3h 50m
2026-07-26 HYS256 TSR → OTP Jul 26, 16:10 UTCJul 26, 16:40 UTC30m
2026-07-26 HYS255 OTP → TSR Jul 26, 14:40 UTCJul 26, 15:00 UTC20m
2026-07-26 HYS763 OMR → OTP Jul 26, 12:40 UTCJul 26, 13:30 UTC50m
2026-07-26 HYS5922 - Jul 26, 06:35 UTCJul 26, 08:30 UTC1h 55m
2026-07-26 HYS5921 - Jul 26, 03:05 UTCJul 26, 04:45 UTC1h 40m
2026-07-25 HYS5680 - Jul 25, 21:20 UTCJul 26, 00:15 UTC2h 55m
2026-07-25 HYS5679 - Jul 25, 16:35 UTCJul 25, 19:20 UTC2h 45m
2026-07-25 HYS7679 OMR → OMR Jul 25, 07:40 UTCJul 25, 15:15 UTC7h 35m
2026-07-25 HYS762 OTP → OMR Jul 25, 06:05 UTCJul 25, 06:50 UTC45m
2026-07-25 HYS761 OMR → OTP Jul 25, 04:05 UTCJul 25, 04:50 UTC45m
2026-07-24 HYS8982 - Jul 24, 22:20 UTCJul 25, 00:25 UTC2h 5m
2026-07-24 HYS8981 - Jul 24, 19:00 UTCJul 24, 20:50 UTC1h 50m
2026-07-24 HYS762 OTP → OMR Jul 24, 17:20 UTCJul 24, 18:00 UTC40m
2026-07-24 HYS275 CLJ → OTP Jul 24, 15:45 UTCJul 24, 16:15 UTC30m
2026-07-24 HYS276 OTP → CLJ Jul 24, 14:20 UTCJul 24, 14:50 UTC30m
2026-07-24 HYS222 CDG → OTP Jul 24, 10:50 UTCJul 24, 13:10 UTC2h 20m
2026-07-24 HYS221 OTP → CDG Jul 24, 06:35 UTCJul 24, 09:20 UTC2h 45m
2026-07-24 HYS254 TSR → OTP Jul 24, 05:05 UTCJul 24, 05:40 UTC35m
2026-07-24 HYS253 OTP → TSR Jul 24, 03:45 UTCJul 24, 04:15 UTC30m
2026-07-23 HYS256 - Jul 23, 18:20 UTCJul 23, 18:55 UTC35m
2026-07-23 HYS255 - Jul 23, 16:40 UTCJul 23, 17:20 UTC40m
2026-07-23 HYS8462 - Jul 23, 14:25 UTCJul 23, 15:40 UTC1h 15m
2026-07-23 HYS7473 - Jul 23, 11:10 UTCJul 23, 12:50 UTC1h 40m
2026-07-23 HYS7474 - Jul 23, 03:50 UTCJul 23, 05:20 UTC1h 30m
2026-07-23 HYS8461 - Jul 23, 01:25 UTCJul 23, 02:50 UTC1h 25m
2026-07-22 HYS8312 - Jul 22, 20:10 UTCJul 22, 22:35 UTC2h 25m
2026-07-22 HYS8311 - Jul 22, 15:25 UTCJul 22, 17:45 UTC2h 20m
2026-07-22 HYS7332 RHO → OTP Jul 22, 11:35 UTCJul 22, 13:00 UTC1h 25m
2026-07-22 HYS7331 - Jul 22, 03:15 UTCJul 22, 04:50 UTC1h 35m
2026-07-21 HYS258 DUB → OTP Jul 21, 22:35 UTCJul 22, 01:45 UTC3h 10m
2026-07-21 HYS257 OTP → DUB Jul 21, 17:45 UTCJul 21, 21:10 UTC3h 25m
2026-07-21 HYS277 CLJ → OTP Jul 21, 11:00 UTCJul 21, 11:35 UTC35m
2026-07-21 HYS278 - Jul 21, 09:30 UTCJul 21, 10:00 UTC30m
2026-07-21 HYS761 OMR → OTP Jul 21, 07:30 UTCJul 21, 08:10 UTC40m
2026-07-21 HYS8248 - Jul 21, 04:45 UTCJul 21, 06:30 UTC1h 45m
2026-07-21 HYS8247 - Jul 21, 01:55 UTCJul 21, 03:30 UTC1h 35m
2026-07-20 HYS762 OTP → OMR Jul 20, 16:25 UTCJul 20, 17:20 UTC55m
2026-07-20 HYS275 CLJ → OTP Jul 20, 15:05 UTCJul 20, 15:35 UTC30m
2026-07-20 HYS276 OTP → CLJ Jul 20, 13:30 UTCJul 20, 14:00 UTC30m
2026-07-20 HYS7174 - Jul 20, 11:15 UTCJul 20, 12:20 UTC1h 5m
2026-07-20 HYS7173 OTP → GPA Jul 20, 08:35 UTCJul 20, 10:00 UTC1h 25m
2026-07-20 HYS254 TSR → OTP Jul 20, 05:45 UTCJul 20, 06:20 UTC35m
2026-07-20 HYS253 OTP → TSR Jul 20, 04:20 UTCJul 20, 04:55 UTC35m
2026-07-19 HYS7726 - Jul 19, 21:20 UTCJul 19, 23:05 UTC1h 45m
2026-07-19 HYS7729 - Jul 19, 18:20 UTCJul 19, 20:20 UTC2h 0m
2026-07-19 HYS7730 LCA → TSR Jul 19, 15:20 UTCJul 19, 17:20 UTC2h 0m
2026-07-19 HYS7725 - Jul 19, 12:25 UTCJul 19, 14:10 UTC1h 45m
2026-07-19 HYS236 TLV → OTP Jul 19, 08:55 UTCJul 19, 11:05 UTC2h 10m
2026-07-19 HYS235 OTP → TLV Jul 19, 05:30 UTCJul 19, 07:40 UTC2h 10m

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

Mode-S 4A4D79 frequently asked

What is Mode-S code 4A4D79?
4A4D79 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-SKY.
Where is Mode-S 4A4D79 registered?
Mode-S code 4A4D79 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A4D79 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A4D79, octal 22446571, decimal 4,869,497.
What flights does 4A4D79 operate?
Mode-S 4A4D79 has broadcast 20 distinct callsigns, including HYS474, HYS473, HYS243, HYS244, HYS256.