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sensors Mode-S transponder

4A5DF7

ICAO 24-bit transponder address · allocated to Romania

Currently assigned to YR-WOW · AIRBUS A-321neo

Hex
4A5DF7
Octal
22456767
Decimal
4,873,719
Country
RO
Tail
YR-WOW
Type
A21N
Broadcasting now · callsign HYS8511 · 35,025 ft
Flights observed
298
Distinct callsigns
20
Country
RO
Last broadcast
Jul 26, 21:45 UTC

Current position

4A5DF7 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4A5DF7 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
HYS7551 - 12 2026-07-10
HYS7413 - 12 2026-07-09
HYS8303 - 11 2026-07-08
HYS7615 - 10 2026-07-11
HYS473 HiSky Europe 10 2026-07-26
HYS7616 - 9 2026-07-11
HYS7552 - 9 2026-07-03
HYS474 HiSky Europe 9 2026-07-25
HYS7414 - 8 2026-07-09
HYS263 - 8 2026-06-29
HYS8511 - 7 2026-07-10
HYS8304 - 7 2026-07-08
HYS264 - 7 2026-06-29
HYS7411 - 6 2026-06-18
HYS7201 - 6 2026-07-07
HYS7122 - 6 2026-07-06
HYS7121 - 6 2026-07-06
HYS446 HiSky Europe 6 2026-07-26
HYS243 HiSky Europe 6 2026-07-25
HYS8512 - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HYS473 RMO → DUB Jul 26, 18:10 UTCJul 26, 21:45 UTC3h 35m
2026-07-26 HYS446 BVA → RMO Jul 26, 14:30 UTCJul 26, 16:40 UTC2h 10m
2026-07-26 HYS225 BAY → BVA Jul 26, 11:10 UTCJul 26, 13:20 UTC2h 10m
2026-07-26 HYS226 BVA → BAY Jul 26, 08:20 UTCJul 26, 10:15 UTC1h 55m
2026-07-26 HYS445 RMO → BVA Jul 26, 04:35 UTCJul 26, 07:05 UTC2h 31m
2026-07-25 HYS474 DUB → RMO Jul 25, 23:40 UTCJul 26, 02:35 UTC2h 55m
2026-07-25 HYS243 IAS → DUB Jul 25, 19:10 UTCJul 25, 22:30 UTC3h 20m
2026-07-25 HYS244 - Jul 25, 15:10 UTCJul 25, 17:55 UTC2h 45m
2026-07-25 HYS473 RMO → DUB Jul 25, 10:30 UTCJul 25, 13:55 UTC3h 25m
2026-07-25 HYM484 BGY → RMO Jul 25, 07:20 UTCJul 25, 09:05 UTC1h 45m
2026-07-25 HYM483 RMO → BGY Jul 25, 04:05 UTCJul 25, 05:55 UTC1h 50m
2026-07-24 HYS474 DUB → RMO Jul 24, 22:45 UTCJul 25, 01:40 UTC2h 55m
2026-07-24 HYS473 RMO → DUB Jul 24, 14:55 UTCJul 24, 21:15 UTC6h 20m
2026-07-24 HYS491 RMO → VCE Jul 24, 12:35 UTCJul 24, 13:50 UTC1h 15m
2026-07-24 HYM404 DUS → RMO Jul 24, 08:35 UTCJul 24, 10:30 UTC1h 55m
2026-07-24 HYM458 TLV → RMO Jul 24, 00:00 UTCJul 24, 02:15 UTC2h 15m
2026-07-23 HYM457 RMO → TLV Jul 23, 20:50 UTCJul 23, 22:25 UTC1h 35m
2026-07-23 HYS446 BVA → RMO Jul 23, 16:00 UTCJul 23, 18:15 UTC2h 15m
2026-07-23 HYS225 - Jul 23, 12:50 UTCJul 23, 14:55 UTC2h 5m
2026-07-23 HYS226 BVA → BAY Jul 23, 10:05 UTCJul 23, 11:55 UTC1h 50m
2026-07-23 HYS445 RMO → BVA Jul 23, 06:25 UTCJul 23, 09:05 UTC2h 40m
2026-07-23 HYS474 DUB → RMO Jul 23, 00:15 UTCJul 23, 03:05 UTC2h 50m
2026-07-22 HYS243 IAS → DUB Jul 22, 16:00 UTCJul 22, 23:15 UTC7h 15m
2026-07-22 HYS473 RMO → DUB Jul 22, 11:15 UTCJul 22, 14:50 UTC3h 35m
2026-07-22 HYM483 RMO → BGY Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-22 HYM458 TLV → RMO Jul 22, 00:45 UTCJul 22, 02:55 UTC2h 10m
2026-07-21 HYM457 RMO → TLV Jul 21, 21:10 UTCJul 21, 23:20 UTC2h 10m
2026-07-21 HYM412 STN → RMO Jul 21, 17:15 UTCJul 21, 19:40 UTC2h 25m
2026-07-21 HYM411 RMO → STN Jul 21, 13:20 UTCJul 21, 15:35 UTC2h 15m
2026-07-21 HYM404 DUS → RMO Jul 21, 09:35 UTCJul 21, 11:25 UTC1h 50m
2026-07-21 HYM403 RMO → DUS Jul 21, 04:05 UTCJul 21, 06:25 UTC2h 20m
2026-07-20 HYS474 DUB → RMO Jul 20, 23:40 UTCJul 21, 02:40 UTC3h 0m
2026-07-20 HYS243 IAS → DUB Jul 20, 19:10 UTCJul 20, 22:25 UTC3h 15m
2026-07-20 HYS244 - Jul 20, 15:05 UTCJul 20, 17:55 UTC2h 50m
2026-07-20 HYS473 RMO → DUB Jul 20, 07:35 UTCJul 20, 13:45 UTC6h 10m
2026-07-20 HYS491 RMO → VCE Jul 20, 04:10 UTCJul 20, 06:05 UTC1h 55m
2026-07-19 HYM458 TLV → RMO Jul 19, 22:10 UTCJul 20, 00:15 UTC2h 5m
2026-07-19 HYS446 - Jul 19, 14:50 UTCJul 19, 20:50 UTC6h 0m
2026-07-19 HYS225 - Jul 19, 11:10 UTCJul 19, 13:25 UTC2h 15m
2026-07-19 HYS226 BVA → BAY Jul 19, 08:25 UTCJul 19, 10:15 UTC1h 50m
2026-07-19 HYS445 RMO → BVA Jul 19, 04:15 UTCJul 19, 06:55 UTC2h 40m
2026-07-18 HYS474 - Jul 18, 23:35 UTCJul 19, 02:25 UTC2h 50m
2026-07-18 HYS243 IAS → DUB Jul 18, 20:20 UTCJul 18, 22:20 UTC2h 0m
2026-07-18 HYS244 - Jul 18, 15:05 UTCJul 18, 17:50 UTC2h 45m
2026-07-18 HYS473 - Jul 18, 10:10 UTCJul 18, 13:35 UTC3h 25m
2026-07-18 HYM484 - Jul 18, 07:05 UTCJul 18, 08:40 UTC1h 35m
2026-07-18 HYM483 - Jul 18, 04:00 UTCJul 18, 06:00 UTC2h 0m
2026-07-17 HYS474 - Jul 17, 22:45 UTCJul 18, 01:45 UTC3h 0m
2026-07-17 HYS473 DUS → DUB Jul 17, 15:10 UTCJul 17, 21:39 UTC6h 30m
2026-07-17 HYM346 - Jul 17, 07:14 UTCJul 17, 13:20 UTC6h 5m

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

Mode-S 4A5DF7 frequently asked

What is Mode-S code 4A5DF7?
4A5DF7 is an ICAO 24-bit transponder address. Allocated to Romania. Assigned to YR-WOW.
Where is Mode-S 4A5DF7 registered?
Mode-S code 4A5DF7 is allocated to Romania (RO). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A5DF7 broadcasting right now?
Yes. Mode-S 4A5DF7 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A5DF7, octal 22456767, decimal 4,873,719.
What flights does 4A5DF7 operate?
Mode-S 4A5DF7 has broadcast 20 distinct callsigns, including HYS7551, HYS7413, HYS8303, HYS7615, HYS473.