Apparatus

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sensors Mode-S transponder

4CA256

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-DHA · BOEING 737-800

Hex
4CA256
Octal
23121126
Decimal
5,022,294
Country
IE
Tail
EI-DHA
Type
B738
No current signal · last broadcast 5h ago
Flights observed
415
Distinct callsigns
20
Country
IE
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4CA256.

Country allocation

The ICAO 24-bit address 4CA256 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
RYR96DK Ryanair 4 2026-05-08
RYR84AV Ryanair 4 2026-05-15
RYR5UM Ryanair 4 2026-05-15
RYR47TK Ryanair 4 2026-04-16
RYR4057 Ryanair 4 2026-04-16
RYR2495 Ryanair 4 2026-05-08
RYR93HA Ryanair 3 2026-05-04
RYR7UH Ryanair 3 2026-05-06
RYR70ST Ryanair 3 2026-05-06
RYR59RR Ryanair 3 2026-05-04
RYR4PG Ryanair 3 2026-05-15
RYR4542 - 3 2026-04-13
RYR4541 - 3 2026-04-13
RYR34HL Ryanair 3 2026-05-23
RYR26LU Ryanair 3 2026-05-23
RYR1343 Ryanair 3 2026-05-15
RYR9KG Ryanair 2 2026-05-04
RYR9EN Ryanair 2 2026-05-21
RYR9BY Ryanair 2 2026-05-23
RYR95JY Ryanair 2 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 RYR28PF SVQ → FKB Jun 12, 18:01 UTCJun 12, 20:25 UTC2h 25m
2026-06-12 RYR28XE FKB → SVQ Jun 12, 14:55 UTCJun 12, 17:10 UTC2h 15m
2026-06-12 RYR926T STN → FKB Jun 12, 13:05 UTCJun 12, 14:01 UTC55m
2026-06-12 RYR95JY FKB → STN Jun 12, 10:35 UTCJun 12, 11:50 UTC1h 15m
2026-06-12 RYR77EJ BRI → FKB Jun 12, 07:20 UTCJun 12, 09:05 UTC1h 45m
2026-06-12 RYR80ZH FKB → BRI Jun 12, 04:35 UTCJun 12, 06:20 UTC1h 45m
2026-06-11 RYR1DA TFS → BER Jun 11, 19:35 UTCJun 11, 20:50 UTC1h 15m
2026-06-11 RYR5GE MAN → MAD Jun 11, 17:50 UTCJun 11, 18:40 UTC50m
2026-06-11 RYR732U AGP → FKB Jun 11, 14:15 UTCJun 11, 16:40 UTC2h 25m
2026-06-11 RYR95LU FKB → AGP Jun 11, 10:35 UTCJun 11, 12:50 UTC2h 15m
2026-06-11 RYR39WL ALC → FKB Jun 11, 07:15 UTCJun 11, 09:30 UTC2h 15m
2026-06-11 RYR88SA FKB → ALC Jun 11, 04:10 UTCJun 11, 05:55 UTC1h 45m
2026-06-10 RYR9WD ZAD → STN Jun 10, 19:05 UTCJun 10, 20:40 UTC1h 35m
2026-06-10 RYR1WZ DUB → STN Jun 10, 16:25 UTCJun 10, 17:55 UTC1h 30m
2026-06-10 RYR9532 - Jun 10, 13:00 UTCJun 10, 15:05 UTC2h 5m
2026-06-10 RYR9533 FKB → BBU Jun 10, 09:40 UTCJun 10, 11:35 UTC1h 55m
2026-06-10 RYR1DA TFS → BER Jun 10, 07:15 UTCJun 10, 08:25 UTC1h 10m
2026-06-10 RYR5GE MAN → MAD Jun 10, 05:25 UTCJun 10, 06:20 UTC55m
2026-06-09 RYR21VN STN → FKB Jun 9, 19:00 UTCJun 9, 20:00 UTC1h 0m
2026-06-09 RYR6JR FKB → STN Jun 9, 17:05 UTCJun 9, 18:10 UTC1h 5m
2026-06-09 RYR48MU VLC → FKB Jun 9, 14:20 UTCJun 9, 15:50 UTC1h 30m
2026-06-09 RYR5VJ BOD → OPO Jun 9, 11:10 UTCJun 9, 13:15 UTC2h 5m
2026-06-09 RYR926T STN → FKB Jun 9, 08:50 UTCJun 9, 10:00 UTC1h 10m
2026-06-09 RYR95JY FKB → STN Jun 9, 07:00 UTCJun 9, 08:05 UTC1h 5m
2026-06-09 RYR8VG POZ → STN Jun 9, 04:00 UTCJun 9, 06:00 UTC2h 0m
2026-06-08 RYR22MM MLA → ARN Jun 8, 17:35 UTCJun 8, 21:10 UTC3h 35m
2026-06-08 RYR3J BVA → SJJ Jun 8, 13:25 UTCJun 8, 16:45 UTC3h 20m
2026-06-08 RYR4623 TLL → ARN Jun 8, 11:20 UTCJun 8, 12:25 UTC1h 5m
2026-06-08 RYR4622 ARN → TLL Jun 8, 09:40 UTCJun 8, 10:20 UTC40m
2026-06-08 RYR3EQ CRL → ARN Jun 8, 06:50 UTCJun 8, 08:40 UTC1h 50m
2026-06-08 RYR7HJ ARN → CRL Jun 8, 04:00 UTCJun 8, 06:00 UTC2h 0m
2026-06-07 RYR613W BDS → ARN Jun 7, 18:50 UTCJun 7, 21:40 UTC2h 50m
2026-06-07 RYR7685 ARN → BDS Jun 7, 15:15 UTCJun 7, 18:00 UTC2h 45m
2026-06-07 RYR4643 BTS → BGY Jun 7, 13:30 UTCJun 7, 14:20 UTC50m
2026-06-07 RYR4642 BGY → BTS Jun 7, 12:00 UTCJun 7, 12:45 UTC45m
2026-06-07 RYR11JL TRN → ARN Jun 7, 08:20 UTCJun 7, 10:35 UTC2h 15m
2026-06-07 RYR56BK ARN → TRN Jun 7, 04:55 UTCJun 7, 07:25 UTC2h 30m
2026-06-06 RYR4SE EDI → MLA Jun 6, 20:55 UTCJun 6, 23:19 UTC2h 25m
2026-06-06 RYR6LG BVA → DUB Jun 6, 17:24 UTCJun 6, 20:00 UTC2h 35m
2026-06-06 RYR305X FAO → OPO Jun 6, 13:15 UTCJun 6, 15:05 UTC1h 50m
2026-06-06 RYR77GC - Jun 6, 10:09 UTCJun 6, 12:00 UTC1h 50m
2026-06-06 RYR27BA - Jun 6, 07:20 UTCJun 6, 08:55 UTC1h 35m
2026-06-05 RYR49EY OPO → STN Jun 5, 22:40 UTCJun 6, 00:25 UTC1h 45m
2026-06-05 RYR93XA BHX → OTP Jun 5, 19:45 UTCJun 5, 21:50 UTC2h 5m
2026-06-05 RYR8BT BRS → WMI Jun 5, 16:30 UTCJun 5, 18:30 UTC2h 0m
2026-06-05 RYR7WK IBZ → BOD Jun 5, 13:25 UTCJun 5, 15:15 UTC1h 50m
2026-06-05 RYR12YU PMI → BOH Jun 5, 10:20 UTCJun 5, 12:20 UTC2h 0m
2026-06-05 RYR8EJ MAD → PMI Jun 5, 07:40 UTCJun 5, 08:30 UTC50m
2026-06-04 RYR5BM - Jun 4, 20:15 UTCJun 4, 21:25 UTC1h 10m
2026-06-04 RYR1BZ ARN → MLA Jun 4, 17:40 UTCJun 4, 18:55 UTC1h 15m

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

Mode-S 4CA256 frequently asked

What is Mode-S code 4CA256?
4CA256 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-DHA.
Where is Mode-S 4CA256 registered?
Mode-S code 4CA256 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA256 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA256, octal 23121126, decimal 5,022,294.
What flights does 4CA256 operate?
Mode-S 4CA256 has broadcast 20 distinct callsigns, including RYR96DK, RYR84AV, RYR5UM, RYR47TK, RYR4057.