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sensors Mode-S transponder

4CA31E

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to 274 · AGUSTA AW-139

Hex
4CA31E
Octal
23121436
Decimal
5,022,494
Country
IE
Tail
274
Type
A139
No current signal · last broadcast 7h ago
Flights observed
102
Distinct callsigns
4
Country
IE
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 4CA31E.

Country allocation

The ICAO 24-bit address 4CA31E 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 4 distinct

Callsign Airline Flights Last seen
AW274 - 82 2026-07-17
WOLF1 - 10 2026-07-08
WOLF2 - 7 2026-07-15
WOLF - 3 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 AW274 - Jul 17, 17:15 UTCJul 17, 19:00 UTC1h 45m
2026-07-17 AW274 - Jul 17, 14:35 UTCJul 17, 14:50 UTC15m
2026-07-17 AW274 - Jul 17, 13:50 UTCJul 17, 14:04 UTC15m
2026-07-16 AW274 - Jul 16, 14:20 UTCJul 16, 15:14 UTC55m
2026-07-16 AW274 - Jul 16, 11:25 UTCJul 16, 12:05 UTC40m
2026-07-16 AW274 - Jul 16, 09:10 UTCJul 16, 10:04 UTC55m
2026-07-15 WOLF2 - Jul 15, 19:10 UTCJul 15, 19:35 UTC25m
2026-07-15 AW274 - Jul 15, 15:55 UTCJul 15, 18:20 UTC2h 25m
2026-07-15 AW274 - Jul 15, 13:30 UTCJul 15, 14:50 UTC1h 20m
2026-07-14 WOLF2 - Jul 14, 13:45 UTCJul 14, 15:00 UTC1h 15m
2026-07-10 WOLF2 - Jul 10, 14:50 UTCJul 10, 17:00 UTC2h 10m
2026-07-09 WOLF2 - Jul 9, 09:55 UTCJul 9, 12:15 UTC2h 20m
2026-07-08 AW274 - Jul 8, 14:35 UTCJul 8, 15:20 UTC45m
2026-07-08 AW274 - Jul 8, 10:40 UTCJul 8, 11:40 UTC1h 0m
2026-07-08 WOLF1 - Jul 8, 01:20 UTCJul 8, 01:30 UTC10m
2026-07-08 WOLF1 - Jul 8, 00:15 UTCJul 8, 00:45 UTC30m
2026-07-07 WOLF1 - Jul 7, 13:05 UTCJul 7, 13:40 UTC35m
2026-07-07 WOLF1 - Jul 7, 12:35 UTCJul 7, 13:00 UTC25m
2026-07-07 WOLF1 - Jul 7, 11:35 UTCJul 7, 12:30 UTC55m
2026-07-03 WOLF1 - Jul 3, 15:30 UTCJul 3, 16:20 UTC50m
2026-07-03 WOLF1 - Jul 3, 14:40 UTCJul 3, 14:50 UTC10m
2026-07-03 WOLF1 - Jul 3, 12:35 UTCJul 3, 12:45 UTC10m
2026-07-02 WOLF1 - Jul 2, 13:30 UTCJul 2, 13:40 UTC10m
2026-07-02 WOLF1 - Jul 2, 09:45 UTCJul 2, 10:35 UTC50m
2026-07-01 WOLF2 - Jul 1, 16:50 UTCJul 1, 18:20 UTC1h 30m
2026-07-01 WOLF2 - Jul 1, 14:50 UTCJul 1, 15:45 UTC55m
2026-07-01 WOLF2 - Jul 1, 08:55 UTCJul 1, 11:00 UTC2h 5m
2026-06-30 AW274 - Jun 30, 15:00 UTCJun 30, 16:15 UTC1h 15m
2026-06-30 AW274 - Jun 30, 09:30 UTCJun 30, 10:30 UTC1h 0m
2026-06-29 AW274 - Jun 29, 22:15 UTCJun 29, 23:39 UTC1h 25m
2026-06-29 AW274 - Jun 29, 19:00 UTCJun 29, 20:19 UTC1h 20m
2026-06-29 AW274 - Jun 29, 18:39 UTCJun 29, 18:55 UTC15m
2026-06-29 AW274 - Jun 29, 14:29 UTCJun 29, 15:19 UTC50m
2026-06-19 AW274 - Jun 19, 15:09 UTCJun 19, 16:19 UTC1h 10m
2026-06-19 AW274 - Jun 19, 12:29 UTCJun 19, 13:34 UTC1h 5m
2026-06-18 WOLF - Jun 18, 08:40 UTCJun 18, 08:55 UTC15m
2026-06-16 AW274 - Jun 16, 14:05 UTCJun 16, 15:20 UTC1h 15m
2026-06-15 AW274 - Jun 15, 14:00 UTCJun 15, 14:55 UTC55m
2026-06-12 AW274 - Jun 12, 15:00 UTCJun 12, 16:45 UTC1h 45m
2026-06-12 AW274 - Jun 12, 11:45 UTCJun 12, 12:55 UTC1h 10m
2026-06-12 AW274 - Jun 12, 10:45 UTCJun 12, 11:10 UTC25m
2026-06-11 AW274 - Jun 11, 13:20 UTCJun 11, 14:20 UTC1h 0m
2026-06-10 AW274 - Jun 10, 16:50 UTCJun 10, 17:55 UTC1h 5m
2026-06-10 AW274 - Jun 10, 16:35 UTCJun 10, 16:45 UTC10m
2026-06-10 AW274 - Jun 10, 14:20 UTCJun 10, 15:20 UTC1h 0m
2026-06-10 AW274 - Jun 10, 11:25 UTCJun 10, 12:25 UTC1h 0m
2026-06-09 AW274 - Jun 9, 22:20 UTCJun 9, 23:50 UTC1h 30m
2026-06-09 AW274 - Jun 9, 18:35 UTCJun 9, 20:10 UTC1h 35m
2026-06-08 AW274 - Jun 8, 13:20 UTCJun 8, 14:50 UTC1h 30m
2026-06-08 AW274 - Jun 8, 10:40 UTCJun 8, 11:50 UTC1h 10m

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 274 page for operator, model, and routing details .

Mode-S 4CA31E frequently asked

What is Mode-S code 4CA31E?
4CA31E is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to 274.
Where is Mode-S 4CA31E registered?
Mode-S code 4CA31E is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CA31E broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CA31E, octal 23121436, decimal 5,022,494.
What flights does 4CA31E operate?
Mode-S 4CA31E has broadcast 4 distinct callsigns, including AW274, WOLF1, WOLF2, WOLF.