Apparatus

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sensors Mode-S transponder

4CA73A

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-EBR · BOEING 737-800

Hex
4CA73A
Octal
23123472
Decimal
5,023,546
Country
IE
Tail
EI-EBR
Type
B738
No current signal · last broadcast 3h ago
Flights observed
591
Distinct callsigns
20
Country
IE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4CA73A.

Country allocation

The ICAO 24-bit address 4CA73A falls within the block assigned to Ireland (IE) by ICAO Annex 10, Volume III. Every aircraft registered in Ireland 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
RYR61JL Ryanair 7 2026-05-30
RYR185L Ryanair 7 2026-05-30
RYR7ME - 6 2026-04-17
RYR100T - 6 2026-06-05
RYR9CE Ryanair 5 2026-05-31
RYR46VF Ryanair 5 2026-05-31
RYR23CG Ryanair 5 2026-05-27
RYR98QX Ryanair 4 2026-05-27
RYR8TH - 4 2026-04-17
RYR87XX Ryanair 4 2026-05-28
RYR877F - 4 2026-04-17
RYR6NE - 4 2026-06-29
RYR6GT Ryanair 4 2026-05-28
RYR539L - 4 2026-06-29
RYR50PU Ryanair 4 2026-05-27
RYR31KK Ryanair 4 2026-04-17
RYR2959 Ryanair 4 2026-05-27
RYR9SU Ryanair 3 2026-06-02
RYR9N Ryanair 3 2026-06-02
RYR9959 Ryanair 3 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RYR7MP - Jul 13, 21:40 UTCJul 13, 23:00 UTC1h 20m
2026-07-13 RYR17EN - Jul 13, 19:15 UTCJul 13, 20:20 UTC1h 5m
2026-07-13 RYR2FF - Jul 13, 16:35 UTCJul 13, 18:00 UTC1h 25m
2026-07-13 RYR8MK TLL → STN Jul 13, 10:30 UTCJul 13, 13:00 UTC2h 30m
2026-07-13 RYR3SM - Jul 13, 07:25 UTCJul 13, 09:40 UTC2h 15m
2026-07-12 RYR799 VCE → STN Jul 12, 22:35 UTCJul 13, 00:20 UTC1h 45m
2026-07-12 RYR19GL - Jul 12, 20:05 UTCJul 12, 21:45 UTC1h 40m
2026-07-12 RYR3EY OPO → HYC Jul 12, 17:10 UTCJul 12, 19:10 UTC2h 0m
2026-07-12 RYR33DA - Jul 12, 11:50 UTCJul 12, 13:40 UTC1h 50m
2026-07-12 RYR7RS - Jul 12, 09:10 UTCJul 12, 10:50 UTC1h 40m
2026-07-12 RYR421P - Jul 12, 07:01 UTCJul 12, 07:50 UTC50m
2026-07-12 RYR4BV - Jul 12, 05:01 UTCJul 12, 05:50 UTC50m
2026-07-11 RYR5465 OPO → OPO Jul 11, 17:00 UTCJul 11, 21:10 UTC4h 10m
2026-07-11 RYR7716 MRS → OPO Jul 11, 14:40 UTCJul 11, 16:05 UTC1h 25m
2026-07-11 RYR7715 - Jul 11, 12:40 UTCJul 11, 13:55 UTC1h 15m
2026-07-11 RYR93XA - Jul 11, 09:25 UTCJul 11, 11:15 UTC1h 50m
2026-07-11 RYR49EY OPO → STN Jul 11, 06:05 UTCJul 11, 08:01 UTC1h 55m
2026-07-10 RYR47FF - Jul 10, 20:40 UTCJul 10, 22:10 UTC1h 30m
2026-07-10 RYR32UX - Jul 10, 18:20 UTCJul 10, 19:45 UTC1h 25m
2026-07-10 RYR4503 LIL → OPO Jul 10, 15:15 UTCJul 10, 17:15 UTC2h 0m
2026-07-10 RYR4502 OPO → LIL Jul 10, 12:25 UTCJul 10, 14:20 UTC1h 55m
2026-07-10 RYR53MM BRS → OPO Jul 10, 09:05 UTCJul 10, 10:50 UTC1h 45m
2026-07-10 RYR1332 OPO → BRS Jul 10, 06:30 UTCJul 10, 08:10 UTC1h 40m
2026-07-09 RYR51SF - Jul 9, 20:50 UTCJul 9, 22:55 UTC2h 5m
2026-07-09 RYR3XJ - Jul 9, 19:05 UTCJul 9, 20:05 UTC1h 0m
2026-07-09 RYR97MQ - Jul 9, 17:20 UTCJul 9, 18:15 UTC55m
2026-07-09 RYR88PX - Jul 9, 14:50 UTCJul 9, 16:30 UTC1h 40m
2026-07-09 RYR8XC - Jul 9, 11:50 UTCJul 9, 13:40 UTC1h 50m
2026-07-09 RYR5CT - Jul 9, 09:10 UTCJul 9, 10:50 UTC1h 40m
2026-07-09 RYR82FL - Jul 9, 06:50 UTCJul 9, 08:05 UTC1h 15m
2026-07-08 RYR8YU - Jul 8, 18:40 UTCJul 8, 20:00 UTC1h 20m
2026-07-08 RYR10VU - Jul 8, 16:40 UTCJul 8, 17:50 UTC1h 10m
2026-07-08 RYR22ZU - Jul 8, 13:20 UTCJul 8, 14:40 UTC1h 20m
2026-07-08 RYR1ST - Jul 8, 11:10 UTCJul 8, 12:25 UTC1h 15m
2026-07-08 RYR6B - Jul 8, 07:45 UTCJul 8, 10:10 UTC2h 25m
2026-07-08 RYR886U - Jul 8, 04:40 UTCJul 8, 06:40 UTC2h 0m
2026-07-07 RYR7H - Jul 7, 19:55 UTCJul 7, 21:05 UTC1h 10m
2026-07-07 RYR12YP - Jul 7, 18:15 UTCJul 7, 19:15 UTC1h 0m
2026-07-07 RYR22ZU - Jul 7, 16:15 UTCJul 7, 17:30 UTC1h 15m
2026-07-07 RYR1ST - Jul 7, 13:40 UTCJul 7, 14:55 UTC1h 15m
2026-07-07 RYR62RA - Jul 7, 08:05 UTCJul 7, 10:30 UTC2h 25m
2026-07-07 RYR1EA - Jul 7, 05:10 UTCJul 7, 07:10 UTC2h 0m
2026-07-06 RYR4KL ALC → CRL Jul 6, 17:30 UTCJul 6, 19:30 UTC2h 0m
2026-07-06 RYR132E - Jul 6, 14:30 UTCJul 6, 16:20 UTC1h 50m
2026-07-06 RYR9PK ATH → CRL Jul 6, 10:35 UTCJul 6, 13:35 UTC3h 0m
2026-07-06 RYR4GB CRL → ATH Jul 6, 06:45 UTCJul 6, 09:30 UTC2h 45m
2026-07-06 RYR9151 - Jul 6, 05:15 UTCJul 6, 05:55 UTC40m
2026-07-05 RYR29XJ - Jul 5, 19:15 UTCJul 5, 21:45 UTC2h 30m
2026-07-05 RYR262A LTN → AGP Jul 5, 15:35 UTCJul 5, 17:50 UTC2h 15m
2026-07-05 RYR81EN NOC → LTN Jul 5, 13:40 UTCJul 5, 14:40 UTC1h 0m

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 EI-EBR page for operator, model, and routing details .

Mode-S 4CA73A frequently asked

What is Mode-S code 4CA73A?
4CA73A is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-EBR.
Where is Mode-S 4CA73A registered?
Mode-S code 4CA73A is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA73A broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA73A, octal 23123472, decimal 5,023,546.
What flights does 4CA73A operate?
Mode-S 4CA73A has broadcast 20 distinct callsigns, including RYR61JL, RYR185L, RYR7ME, RYR100T, RYR9CE.