Apparatus

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sensors Mode-S transponder

4D2519

ICAO 24-bit transponder address

Currently assigned to 9H-QFB · BOEING 737-800

Hex
4D2519
Octal
23222431
Decimal
5,055,769
Tail
9H-QFB
Type
B738
Broadcasting now · callsign RYR6LW · 38,000 ft
Flights observed
295
Distinct callsigns
20
Country
-
Last broadcast
2h ago

Current position

4D2519 is currently broadcasting. Map zoomed to live position.

Callsign history 20 distinct

Callsign Airline Flights Last seen
RYR96RB Ryanair 4 2026-07-21
RYR28RV - 4 2026-07-21
RYR97MQ Ryanair 3 2026-06-18
RYR95AT Ryanair 3 2026-06-26
RYR85AX - 3 2026-07-16
RYR7YG Ryanair 3 2026-07-25
RYR62BC - 3 2026-07-16
RYR5ZL - 3 2026-06-26
RYR515T - 3 2026-06-20
RYR3XJ - 3 2026-06-18
RYR2RG Ryanair 3 2026-06-20
RYR2AT Ryanair 3 2026-07-20
RYR256T Ryanair 3 2026-07-20
RYR98RD - 2 2026-07-20
RYR96AN Ryanair 2 2026-06-16
RYR9179 - 2 2026-07-20
RYR9178 Ryanair 2 2026-07-20
RYR8QW - 2 2026-07-16
RYR86DZ - 2 2026-06-19
RYR86CT Ryanair 2 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 RYR7YG LNZ → STN Jul 25, 04:05 UTCJul 25, 05:10 UTC1h 5m
2026-07-24 RYR10NG AGP → CRL Jul 24, 19:10 UTCJul 24, 20:40 UTC1h 30m
2026-07-24 RYR687L - Jul 24, 16:40 UTCJul 24, 18:00 UTC1h 20m
2026-07-24 RYR6LW STN → OTP Jul 24, 14:00 UTCJul 24, 15:30 UTC1h 30m
2026-07-24 RYR7YG LNZ → STN Jul 24, 11:40 UTCJul 24, 12:50 UTC1h 10m
2026-07-24 RYR57SC EDI → MXP Jul 24, 08:30 UTCJul 24, 10:40 UTC2h 10m
2026-07-24 RYR2074 MXP → EDI Jul 24, 05:20 UTCJul 24, 07:25 UTC2h 5m
2026-07-23 RYR10NG AGP → CRL Jul 23, 21:45 UTCJul 23, 23:20 UTC1h 35m
2026-07-23 RYR687L - Jul 23, 18:40 UTCJul 23, 19:55 UTC1h 15m
2026-07-23 RYR814P - Jul 23, 16:45 UTCJul 23, 17:35 UTC50m
2026-07-23 RYR3SZ - Jul 23, 14:55 UTCJul 23, 15:40 UTC45m
2026-07-23 RYR5U - Jul 23, 12:35 UTCJul 23, 13:40 UTC1h 5m
2026-07-23 RYR69LW STN → NAP Jul 23, 08:45 UTCJul 23, 11:10 UTC2h 25m
2026-07-23 RYR53BM PEG → MLA Jul 23, 05:30 UTCJul 23, 07:50 UTC2h 20m
2026-07-22 RYR48AP - Jul 22, 17:35 UTCJul 22, 18:40 UTC1h 5m
2026-07-22 RYR84JW - Jul 22, 15:25 UTCJul 22, 16:40 UTC1h 15m
2026-07-22 RYR484A - Jul 22, 13:40 UTCJul 22, 14:25 UTC45m
2026-07-22 RYR86CT NAP → VCE Jul 22, 12:00 UTCJul 22, 12:45 UTC45m
2026-07-22 RYR6TV MAN → DUB Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-21 RYR28RV - Jul 21, 19:05 UTCJul 21, 20:00 UTC55m
2026-07-21 RYR96RB NAP → VCE Jul 21, 17:05 UTCJul 21, 18:05 UTC1h 0m
2026-07-21 RYR8VV STN → ACE Jul 21, 14:50 UTCJul 21, 16:00 UTC1h 10m
2026-07-21 RYR30AM - Jul 21, 12:10 UTCJul 21, 13:35 UTC1h 25m
2026-07-21 RYR53JH - Jul 21, 08:45 UTCJul 21, 10:55 UTC2h 10m
2026-07-21 RYR3DP EIN → RAK Jul 21, 05:25 UTCJul 21, 07:40 UTC2h 15m
2026-07-20 RYR256T CTA → NAP Jul 20, 20:50 UTCJul 20, 21:30 UTC40m
2026-07-20 RYR2AT NAP → CTA Jul 20, 19:20 UTCJul 20, 19:50 UTC30m
2026-07-20 RYR1QK - Jul 20, 17:00 UTCJul 20, 17:50 UTC50m
2026-07-20 RYR50DB - Jul 20, 15:15 UTCJul 20, 16:10 UTC55m
2026-07-20 RYR9179 - Jul 20, 11:55 UTCJul 20, 13:50 UTC1h 55m
2026-07-20 RYR9178 BRU → NAP Jul 20, 09:15 UTCJul 20, 11:00 UTC1h 45m
2026-07-20 RYR98RD - Jul 20, 06:35 UTCJul 20, 07:25 UTC50m
2026-07-20 RYR56VF NAP → BGY Jul 20, 04:45 UTCJul 20, 05:45 UTC1h 0m
2026-07-19 RYR7YM - Jul 19, 20:50 UTCJul 19, 21:40 UTC50m
2026-07-19 RYR769V - Jul 19, 17:35 UTCJul 19, 19:05 UTC1h 30m
2026-07-19 RYR15PW - Jul 19, 15:20 UTCJul 19, 16:35 UTC1h 15m
2026-07-19 RYR548Z - Jul 19, 10:25 UTCJul 19, 13:00 UTC2h 35m
2026-07-19 RYR5BA HAM → GDN Jul 19, 06:30 UTCJul 19, 09:05 UTC2h 35m
2026-07-18 RYR3TJ - Jul 18, 21:25 UTCJul 18, 22:55 UTC1h 30m
2026-07-18 RYR14KP - Jul 18, 19:00 UTCJul 18, 20:20 UTC1h 20m
2026-07-18 RYR65CN - Jul 18, 16:25 UTCJul 18, 18:00 UTC1h 35m
2026-07-18 RYR3VT MXP → MAN Jul 18, 13:40 UTCJul 18, 15:35 UTC1h 55m
2026-07-18 RYR303F BER → MXP Jul 18, 11:05 UTCJul 18, 12:25 UTC1h 20m
2026-07-18 RYR785N MXP → BER Jul 18, 08:55 UTCJul 18, 10:15 UTC1h 20m
2026-07-18 RYR6LW - Jul 18, 06:30 UTCJul 18, 08:05 UTC1h 35m
2026-07-18 RYR7YG - Jul 18, 04:05 UTCJul 18, 05:10 UTC1h 5m
2026-07-17 RYR5U - Jul 17, 22:00 UTCJul 17, 23:05 UTC1h 5m
2026-07-17 RYR1661 - Jul 17, 18:55 UTCJul 17, 19:40 UTC45m
2026-07-17 RYR6TV - Jul 17, 17:15 UTCJul 17, 18:05 UTC50m
2026-07-17 RYR28RV - Jul 17, 15:20 UTCJul 17, 16:04 UTC45m

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 9H-QFB page for operator, model, and routing details .

Mode-S 4D2519 frequently asked

What is Mode-S code 4D2519?
4D2519 is an ICAO 24-bit transponder address. Assigned to 9H-QFB.
Is 4D2519 broadcasting right now?
Yes. Mode-S 4D2519 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2519, octal 23222431, decimal 5,055,769.
What flights does 4D2519 operate?
Mode-S 4D2519 has broadcast 20 distinct callsigns, including RYR96RB, RYR28RV, RYR97MQ, RYR95AT, RYR85AX.