Apparatus

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sensors Mode-S transponder

4CA856

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-EMN · BOEING 737-800

Hex
4CA856
Octal
23124126
Decimal
5,023,830
Country
IE
Tail
EI-EMN
Type
B738
Broadcasting now · callsign RYR8048 · 36,000 ft
Flights observed
294
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Current position

4CA856 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4CA856 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
RYR58BW Ryanair 6 2026-04-29
RYR52MH Ryanair 6 2026-04-29
RYR86LD Ryanair 5 2026-04-28
RYR688B Ryanair 5 2026-04-28
RYR5495 Ryanair 5 2026-05-14
RYR65SB Ryanair 4 2026-04-30
RYR54MX - 4 2026-05-14
RYR43PX Ryanair 4 2026-04-30
RYR3NR Ryanair 4 2026-05-15
RYR94MC Ryanair 3 2026-04-28
RYR88WF Ryanair 3 2026-04-28
RYR87XX Ryanair 3 2026-05-12
RYR82XC Ryanair 3 2026-04-29
RYR6GT Ryanair 3 2026-05-12
RYR66WD Ryanair 3 2026-04-28
RYR52TV Ryanair 3 2026-05-28
RYR4YY Ryanair 3 2026-05-31
RYR3SD Ryanair 3 2026-04-28
RYR3JH Ryanair 3 2026-05-28
RYR2PQ Ryanair 3 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 RYR274F BCN → FEZ Jun 2, 17:25 UTCJun 2, 18:40 UTC1h 15m
2026-06-02 RYR6JW BUD → STN Jun 2, 14:15 UTCJun 2, 15:50 UTC1h 35m
2026-06-02 RYR5909 FNI → FEZ Jun 2, 10:50 UTCJun 2, 12:25 UTC1h 35m
2026-06-02 RYR76FJ FEZ → FNI Jun 2, 07:05 UTCJun 2, 08:50 UTC1h 45m
2026-06-01 RYR8XW FCO → EIN Jun 1, 19:05 UTCJun 1, 21:35 UTC2h 30m
2026-06-01 RYR3709 BHX → GNB Jun 1, 15:30 UTCJun 1, 17:50 UTC2h 20m
2026-06-01 RYR15DT SUF → STN Jun 1, 11:35 UTCJun 1, 13:45 UTC2h 10m
2026-06-01 RYR33TU FEZ → BVA Jun 1, 08:05 UTCJun 1, 10:30 UTC2h 25m
2026-06-01 RYR28UJ RAK → FEZ Jun 1, 06:30 UTCJun 1, 06:55 UTC25m
2026-05-31 RYR81NH AGP → FEZ May 31, 22:35 UTCMay 31, 23:00 UTC25m
2026-05-31 RYR4461 FEZ → AGP May 31, 21:00 UTCMay 31, 21:35 UTC35m
2026-05-31 RYR135R EIN → FEZ May 31, 17:25 UTCMay 31, 19:55 UTC2h 30m
2026-05-31 RYR4YY HAM → VLC May 31, 13:10 UTCMay 31, 16:00 UTC2h 50m
2026-05-30 RYR4YM BUD → AMM May 30, 20:40 UTCMay 30, 23:15 UTC2h 35m
2026-05-30 RYR7PF HHN → STN May 30, 16:20 UTCMay 30, 19:25 UTC3h 5m
2026-05-30 RYR82SQ NRN → FEZ May 30, 12:30 UTCMay 30, 15:10 UTC2h 40m
2026-05-30 RYR38VA STN → LDY May 30, 08:35 UTCMay 30, 11:30 UTC2h 55m
2026-05-30 - - May 30, 00:05 UTCMay 30, 00:15 UTC10m
2026-05-29 RYR9408 BGY → FEZ May 29, 21:15 UTCMay 29, 23:20 UTC2h 5m
2026-05-29 RYR9407 FEZ → BGY May 29, 17:50 UTCMay 29, 20:20 UTC2h 30m
2026-05-29 RYR50GF VLC → FEZ May 29, 16:00 UTCMay 29, 16:50 UTC50m
2026-05-29 RYR53UZ FEZ → VLC May 29, 13:55 UTCMay 29, 14:55 UTC1h 0m
2026-05-29 RYR135R EIN → FEZ May 29, 09:55 UTCMay 29, 12:25 UTC2h 30m
2026-05-29 RYR4YY HAM → VLC May 29, 05:45 UTCMay 29, 08:40 UTC2h 55m
2026-05-28 RYR52TV HHN → FEZ May 28, 20:20 UTCMay 28, 22:55 UTC2h 35m
2026-05-28 RYR3JH KRK → RIX May 28, 16:25 UTCMay 28, 19:15 UTC2h 50m
2026-05-28 RYR7YX KGS → BLQ May 28, 13:30 UTCMay 28, 15:10 UTC1h 40m
2026-05-28 RYR559X FEZ → MRS May 28, 10:45 UTCMay 28, 12:35 UTC1h 50m
2026-05-28 RYR2LC CTA → BER May 28, 08:25 UTCMay 28, 09:50 UTC1h 25m
2026-05-28 RYR7862 - May 28, 05:35 UTCMay 28, 07:05 UTC1h 30m
2026-05-27 RYR52TV HHN → FEZ May 27, 19:35 UTCMay 27, 22:15 UTC2h 40m
2026-05-27 RYR3JH KRK → RIX May 27, 15:50 UTCMay 27, 18:45 UTC2h 55m
2026-05-27 RYR6M FEZ → RAK May 27, 12:40 UTCMay 27, 12:50 UTC10m
2026-05-27 RYR9023 DLE → FEZ May 27, 09:25 UTCMay 27, 11:40 UTC2h 15m
2026-05-27 RYR15WP FEZ → DLE May 27, 06:09 UTCMay 27, 08:25 UTC2h 16m
2026-05-26 RYR52TV HHN → FEZ May 26, 18:40 UTCMay 26, 21:14 UTC2h 35m
2026-05-26 RYR3JH KRK → RIX May 26, 15:00 UTCMay 26, 17:50 UTC2h 50m
2026-05-26 RYR7YX KGS → BLQ May 26, 12:00 UTCMay 26, 13:50 UTC1h 50m
2026-05-26 RYR559X FEZ → MRS May 26, 09:15 UTCMay 26, 11:05 UTC1h 50m
2026-05-26 RYR50GF VLC → FEZ May 26, 06:49 UTCMay 26, 07:45 UTC55m
2026-05-26 RYR53UZ FEZ → VLC May 26, 04:54 UTCMay 26, 05:54 UTC1h 0m
2026-05-25 RYR8XW FCO → EIN May 25, 19:20 UTCMay 25, 21:49 UTC2h 30m
2026-05-25 RYR3709 BHX → GNB May 25, 15:05 UTCMay 25, 17:35 UTC2h 30m
2026-05-25 RYR15DT SUF → STN May 25, 11:30 UTCMay 25, 13:50 UTC2h 20m
2026-05-25 RYR33TU FEZ → BVA May 25, 08:05 UTCMay 25, 10:30 UTC2h 25m
2026-05-25 RYR28UJ RAK → FEZ May 25, 06:30 UTCMay 25, 06:55 UTC25m
2026-05-24 RYR81NH AGP → FEZ May 24, 23:00 UTCMay 24, 23:10 UTC10m
2026-05-24 RYR4461 FEZ → AGP May 24, 20:55 UTCMay 24, 21:30 UTC35m
2026-05-24 RYR135R EIN → FEZ May 24, 17:10 UTCMay 24, 19:50 UTC2h 40m
2026-05-24 RYR4YY HAM → VLC May 24, 12:55 UTCMay 24, 15:40 UTC2h 45m

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

Mode-S 4CA856 frequently asked

What is Mode-S code 4CA856?
4CA856 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-EMN.
Where is Mode-S 4CA856 registered?
Mode-S code 4CA856 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA856 broadcasting right now?
Yes. Mode-S 4CA856 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA856, octal 23124126, decimal 5,023,830.
What flights does 4CA856 operate?
Mode-S 4CA856 has broadcast 20 distinct callsigns, including RYR58BW, RYR52MH, RYR86LD, RYR688B, RYR5495.