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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 HYS474 · 35,000 ft
Flights observed
232
Distinct callsigns
20
Country
RO
Last broadcast
27m ago

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
HYS7616 - 9 2026-07-11
HYS7552 - 9 2026-07-03
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
HYS8512 - 5 2026-07-10
HYS8712 - 4 2026-07-05
HYS8711 - 4 2026-06-28
HYS7612 - 4 2026-07-11
HYS7611 - 4 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 HYS474 - Jul 14, 00:25 UTCJul 14, 01:45 UTC1h 20m
2026-07-13 HYS243 - Jul 13, 19:55 UTCJul 13, 23:10 UTC3h 15m
2026-07-13 HYS244 - Jul 13, 15:40 UTCJul 13, 18:30 UTC2h 50m
2026-07-13 HYS473 - Jul 13, 10:35 UTCJul 13, 13:55 UTC3h 20m
2026-07-13 HYS492 - Jul 13, 07:45 UTCJul 13, 09:15 UTC1h 30m
2026-07-13 HYS491 - Jul 13, 04:35 UTCJul 13, 06:01 UTC1h 25m
2026-07-12 HYM458 - Jul 12, 22:25 UTCJul 13, 00:30 UTC2h 5m
2026-07-12 HYM457 - Jul 12, 18:30 UTCJul 12, 20:45 UTC2h 15m
2026-07-12 HYS446 - Jul 12, 14:35 UTCJul 12, 16:50 UTC2h 15m
2026-07-12 HYS225 - Jul 12, 11:10 UTCJul 12, 13:20 UTC2h 10m
2026-07-12 HYS226 - Jul 12, 08:10 UTCJul 12, 10:05 UTC1h 55m
2026-07-11 HYS445 - Jul 11, 22:01 UTCJul 12, 07:01 UTC9h 0m
2026-07-11 HYS7612 - Jul 11, 18:45 UTCJul 11, 21:05 UTC2h 20m
2026-07-11 HYS7615 - Jul 11, 14:15 UTCJul 11, 16:50 UTC2h 35m
2026-07-11 HYS7616 - Jul 11, 10:25 UTCJul 11, 13:00 UTC2h 35m
2026-07-11 HYS7611 - Jul 11, 06:05 UTCJul 11, 08:25 UTC2h 20m
2026-07-11 FOE8430 - Jul 11, 02:15 UTCJul 11, 04:45 UTC2h 30m
2026-07-10 FOE8429 - Jul 10, 21:40 UTCJul 11, 00:05 UTC2h 25m
2026-07-10 HYS8512 - Jul 10, 17:35 UTCJul 10, 20:00 UTC2h 25m
2026-07-10 HYS7551 - Jul 10, 13:05 UTCJul 10, 15:40 UTC2h 35m
2026-07-10 HYS8511 - Jul 10, 05:05 UTCJul 10, 11:40 UTC6h 35m
2026-07-09 HYS7412 - Jul 9, 19:30 UTCJul 9, 21:10 UTC1h 40m
2026-07-09 HYS7413 - Jul 9, 14:10 UTCJul 9, 19:25 UTC5h 15m
2026-07-09 HYS7414 - Jul 9, 05:05 UTCJul 9, 11:55 UTC6h 50m
2026-07-08 HYS8312 - Jul 8, 17:10 UTCJul 8, 23:35 UTC6h 25m
2026-07-08 HYS8304 - Jul 8, 11:10 UTCJul 8, 15:50 UTC4h 40m
2026-07-08 HYS8303 - Jul 8, 08:40 UTCJul 8, 09:30 UTC50m
2026-07-08 HYS8303 - Jul 8, 04:35 UTCJul 8, 08:35 UTC4h 0m
2026-07-07 HYS7202 - Jul 7, 18:40 UTCJul 7, 23:50 UTC5h 10m
2026-07-07 HYS7201 - Jul 7, 11:45 UTCJul 7, 16:50 UTC5h 5m
2026-07-07 HYS277 - Jul 7, 07:05 UTCJul 7, 07:35 UTC30m
2026-07-07 HYS278 - Jul 7, 05:50 UTCJul 7, 06:20 UTC30m
2026-07-06 HYS7108 - Jul 6, 20:15 UTCJul 6, 22:55 UTC2h 40m
2026-07-06 HYS7107 - Jul 6, 15:40 UTCJul 6, 18:15 UTC2h 35m
2026-07-06 HYS246 - Jul 6, 11:35 UTCJul 6, 13:45 UTC2h 10m
2026-07-06 HYS245 - Jul 6, 07:45 UTCJul 6, 10:15 UTC2h 30m
2026-07-06 HYS7122 - Jul 6, 04:35 UTCJul 6, 05:55 UTC1h 20m
2026-07-06 HYS7121 - Jul 6, 01:45 UTCJul 6, 03:10 UTC1h 25m
2026-07-05 HYS222 - Jul 5, 16:20 UTCJul 5, 18:35 UTC2h 15m
2026-07-05 HYS221 - Jul 5, 12:10 UTCJul 5, 14:55 UTC2h 45m
2026-07-05 HYS8712 - Jul 5, 03:20 UTCJul 5, 10:15 UTC6h 55m
2026-07-04 HYS7612 - Jul 4, 19:10 UTCJul 4, 21:35 UTC2h 25m
2026-07-04 HYS7615 - Jul 4, 14:30 UTCJul 4, 17:05 UTC2h 35m
2026-07-04 HYS7616 - Jul 4, 06:05 UTCJul 4, 13:10 UTC7h 5m
2026-07-03 FOE8429 - Jul 3, 21:50 UTCJul 4, 04:45 UTC6h 55m
2026-07-03 HYS8512 - Jul 3, 13:25 UTCJul 3, 20:05 UTC6h 40m
2026-07-03 HYS7552 - Jul 3, 05:05 UTCJul 3, 11:50 UTC6h 45m
2026-07-02 HYS7413 - Jul 2, 13:25 UTCJul 2, 20:25 UTC7h 0m
2026-07-02 HYS7414 - Jul 2, 05:15 UTCJul 2, 12:10 UTC6h 55m
2026-07-01 HYS8304 FNC → OTP Jul 1, 11:35 UTCJul 1, 16:40 UTC5h 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, HYS7616.