Apparatus

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sensors Mode-S transponder

4CABC4

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-GUM · ATR-72-600

Hex
4CABC4
Octal
23125704
Decimal
5,024,708
Country
IE
Tail
EI-GUM
Type
AT76
No current signal · last broadcast 5h ago
Flights observed
129
Distinct callsigns
17
Country
IE
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4CABC4.

Country allocation

The ICAO 24-bit address 4CABC4 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 17 distinct

Callsign Airline Flights Last seen
ABR5YS - 53 2026-07-06
ABR7TS - 36 2026-07-07
ABR2PG - 8 2026-05-07
ABR1PG - 8 2026-05-07
ABR4332 - 5 2026-05-22
ABR4232 - 4 2026-04-29
ABR6UE - 2 2026-07-08
ABR4UE - 2 2026-07-08
ABR4950 - 2 2026-04-14
ABR4331 - 2 2026-07-07
ABS4TS - 1 2026-04-20
ABR4TS - 1 2026-04-22
ABR4FS - 1 2026-05-06
ABR4160 - 1 2026-06-17
ABR2VE - 1 2026-07-14
ABR2UC - 1 2026-06-24
ABR1UC - 1 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ABR2VE - Jul 14, 02:05 UTCJul 14, 03:55 UTC1h 50m
2026-07-08 ABR4UE NUE → LGG Jul 8, 20:50 UTCJul 8, 22:00 UTC1h 10m
2026-07-08 ABR6UE - Jul 8, 02:25 UTCJul 8, 03:55 UTC1h 30m
2026-07-07 ABR4331 TLS → CDG Jul 7, 20:55 UTCJul 7, 22:35 UTC1h 40m
2026-07-07 ABR7TS CDG → TLS Jul 7, 03:00 UTCJul 7, 04:25 UTC1h 25m
2026-07-06 ABR5YS NCE → CDG Jul 6, 18:55 UTCJul 6, 20:45 UTC1h 50m
2026-07-06 ABR5YS - Jul 6, 16:25 UTCJul 6, 17:40 UTC1h 15m
2026-07-03 ABR7TS - Jul 3, 02:50 UTCJul 3, 04:20 UTC1h 30m
2026-07-02 ABR5YS - Jul 2, 19:00 UTCJul 2, 20:50 UTC1h 50m
2026-07-02 ABR5YS TLS → NCE Jul 2, 16:30 UTCJul 2, 17:45 UTC1h 15m
2026-07-02 ABR7TS - Jul 2, 03:10 UTCJul 2, 04:35 UTC1h 25m
2026-07-01 ABR5YS - Jul 1, 20:50 UTCJul 1, 22:45 UTC1h 55m
2026-07-01 ABR5YS - Jul 1, 18:15 UTCJul 1, 19:30 UTC1h 15m
2026-07-01 ABR7TS CDG → TLS Jul 1, 02:45 UTCJul 1, 04:10 UTC1h 25m
2026-06-30 ABR5YS - Jun 30, 19:10 UTCJun 30, 21:05 UTC1h 55m
2026-06-30 ABR5YS - Jun 30, 17:05 UTCJun 30, 18:10 UTC1h 5m
2026-06-30 ABR7TS - Jun 30, 02:50 UTCJun 30, 04:25 UTC1h 35m
2026-06-29 ABR5YS NCE → CDG Jun 29, 19:29 UTCJun 29, 21:24 UTC1h 55m
2026-06-29 ABR5YS - Jun 29, 16:55 UTCJun 29, 17:59 UTC1h 5m
2026-06-26 ABR7TS - Jun 26, 02:54 UTCJun 26, 04:24 UTC1h 30m
2026-06-25 ABR4331 TLS → CDG Jun 25, 21:05 UTCJun 25, 22:34 UTC1h 30m
2026-06-25 ABR7TS - Jun 25, 02:54 UTCJun 25, 04:25 UTC1h 30m
2026-06-24 ABR2UC - Jun 24, 20:05 UTCJun 24, 22:10 UTC2h 5m
2026-06-24 ABR1UC - Jun 24, 02:20 UTCJun 24, 03:35 UTC1h 15m
2026-06-23 ABR4UE - Jun 23, 20:40 UTCJun 23, 21:45 UTC1h 5m
2026-06-23 ABR6UE - Jun 23, 02:09 UTCJun 23, 03:29 UTC1h 20m
2026-06-22 ABR5YS - Jun 22, 19:05 UTCJun 22, 20:55 UTC1h 50m
2026-06-22 ABR5YS TLS → NCE Jun 22, 16:50 UTCJun 22, 18:04 UTC1h 15m
2026-06-19 ABR7TS - Jun 19, 02:59 UTCJun 19, 04:25 UTC1h 25m
2026-06-18 ABR5YS NCE → CDG Jun 18, 20:50 UTCJun 18, 22:40 UTC1h 50m
2026-06-18 ABR5YS TLS → NCE Jun 18, 16:40 UTCJun 18, 17:50 UTC1h 10m
2026-06-18 ABR7TS CDG → TLS Jun 18, 02:55 UTCJun 18, 04:20 UTC1h 25m
2026-06-17 ABR4160 - Jun 17, 19:20 UTCJun 17, 21:05 UTC1h 45m
2026-06-17 ABR7TS - Jun 17, 02:40 UTCJun 17, 04:10 UTC1h 30m
2026-06-16 ABR5YS - Jun 16, 18:50 UTCJun 16, 20:40 UTC1h 51m
2026-06-16 ABR5YS - Jun 16, 16:35 UTCJun 16, 17:45 UTC1h 10m
2026-06-16 ABR7TS CDG → TLS Jun 16, 02:54 UTCJun 16, 04:20 UTC1h 25m
2026-06-15 ABR5YS - Jun 15, 18:40 UTCJun 15, 20:40 UTC2h 0m
2026-06-15 ABR5YS TLS → NCE Jun 15, 16:30 UTCJun 15, 17:34 UTC1h 5m
2026-06-12 ABR7TS - Jun 12, 02:40 UTCJun 12, 04:00 UTC1h 20m
2026-06-11 ABR5YS - Jun 11, 18:40 UTCJun 11, 20:35 UTC1h 55m
2026-06-11 ABR5YS - Jun 11, 16:30 UTCJun 11, 18:05 UTC1h 35m
2026-06-11 ABR7TS CDG → TLS Jun 11, 03:00 UTCJun 11, 04:20 UTC1h 20m
2026-06-10 ABR5YS NCE → CDG Jun 10, 18:50 UTCJun 10, 20:40 UTC1h 50m
2026-06-10 ABR5YS TLS → NCE Jun 10, 16:30 UTCJun 10, 17:40 UTC1h 10m
2026-06-10 ABR7TS CDG → TLS Jun 10, 02:55 UTCJun 10, 04:25 UTC1h 30m
2026-06-09 ABR5YS NCE → CDG Jun 9, 18:45 UTCJun 9, 20:30 UTC1h 45m
2026-06-09 ABR5YS - Jun 9, 16:45 UTCJun 9, 17:35 UTC50m
2026-06-09 ABR7TS - Jun 9, 03:00 UTCJun 9, 04:35 UTC1h 35m
2026-06-08 ABR5YS - Jun 8, 19:10 UTCJun 8, 20:55 UTC1h 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-GUM page for operator, model, and routing details .

Mode-S 4CABC4 frequently asked

What is Mode-S code 4CABC4?
4CABC4 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-GUM.
Where is Mode-S 4CABC4 registered?
Mode-S code 4CABC4 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CABC4 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 4CABC4, octal 23125704, decimal 5,024,708.
What flights does 4CABC4 operate?
Mode-S 4CABC4 has broadcast 17 distinct callsigns, including ABR5YS, ABR7TS, ABR2PG, ABR1PG, ABR4332.