Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4058E2

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CKFG · Grob G 103 Twin Astir II Acro

Hex
4058E2
Octal
20054342
Decimal
4,217,058
Country
GB
Tail
G-CKFG
Type
GLID
No current signal · last broadcast 1d ago
Flights observed
99
Distinct callsigns
1
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4058E2.

Country allocation

The ICAO 24-bit address 4058E2 falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom 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 1 distinct

Callsign Airline Flights Last seen
GCKFG - 99 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 GCKFG - Jul 16, 15:05 UTCJul 16, 15:14 UTC10m
2026-07-16 GCKFG - Jul 16, 14:35 UTCJul 16, 15:00 UTC25m
2026-07-16 GCKFG - Jul 16, 13:00 UTCJul 16, 13:34 UTC35m
2026-07-16 GCKFG - Jul 16, 12:09 UTCJul 16, 12:14 UTC5m
2026-07-16 GCKFG - Jul 16, 10:40 UTCJul 16, 11:25 UTC45m
2026-07-15 GCKFG - Jul 15, 15:50 UTCJul 15, 16:20 UTC30m
2026-07-15 GCKFG - Jul 15, 13:20 UTCJul 15, 13:25 UTC5m
2026-07-09 GCKFG - Jul 9, 14:40 UTCJul 9, 15:05 UTC25m
2026-07-09 GCKFG - Jul 9, 13:30 UTCJul 9, 14:35 UTC1h 5m
2026-07-09 GCKFG - Jul 9, 12:50 UTCJul 9, 13:25 UTC35m
2026-07-09 GCKFG - Jul 9, 12:35 UTCJul 9, 12:45 UTC10m
2026-07-09 GCKFG - Jul 9, 10:55 UTCJul 9, 12:10 UTC1h 15m
2026-07-09 GCKFG - Jul 9, 10:00 UTCJul 9, 10:50 UTC50m
2026-07-07 GCKFG - Jul 7, 12:55 UTCJul 7, 13:05 UTC10m
2026-07-07 GCKFG - Jul 7, 10:40 UTCJul 7, 11:10 UTC30m
2026-07-02 GCKFG - Jul 2, 15:25 UTCJul 2, 16:50 UTC1h 25m
2026-07-02 GCKFG - Jul 2, 12:10 UTCJul 2, 12:15 UTC5m
2026-07-02 GCKFG - Jul 2, 11:15 UTCJul 2, 11:40 UTC25m
2026-07-02 GCKFG - Jul 2, 10:50 UTCJul 2, 10:55 UTC5m
2026-07-01 GCKFG - Jul 1, 19:35 UTCJul 1, 19:50 UTC15m
2026-07-01 GCKFG - Jul 1, 18:35 UTCJul 1, 18:40 UTC5m
2026-07-01 GCKFG - Jul 1, 16:15 UTCJul 1, 16:40 UTC25m
2026-07-01 GCKFG - Jul 1, 14:45 UTCJul 1, 14:55 UTC10m
2026-07-01 GCKFG - Jul 1, 13:35 UTCJul 1, 13:40 UTC5m
2026-07-01 GCKFG - Jul 1, 13:05 UTCJul 1, 13:25 UTC20m
2026-07-01 GCKFG - Jul 1, 11:25 UTCJul 1, 11:30 UTC5m
2026-07-01 GCKFG - Jul 1, 10:30 UTCJul 1, 10:50 UTC20m
2026-06-19 GCKFG - Jun 19, 19:29 UTCJun 19, 20:34 UTC1h 5m
2026-06-19 GCKFG - Jun 19, 18:44 UTCJun 19, 19:09 UTC25m
2026-06-19 GCKFG - Jun 19, 17:44 UTCJun 19, 18:14 UTC30m
2026-06-19 GCKFG - Jun 19, 17:24 UTCJun 19, 17:29 UTC5m
2026-06-19 GCKFG - Jun 19, 14:59 UTCJun 19, 15:59 UTC1h 0m
2026-06-19 GCKFG - Jun 19, 13:44 UTCJun 19, 13:50 UTC5m
2026-06-19 GCKFG - Jun 19, 13:14 UTCJun 19, 13:20 UTC5m
2026-06-19 GCKFG - Jun 19, 12:09 UTCJun 19, 12:29 UTC20m
2026-06-19 GCKFG - Jun 19, 09:34 UTCJun 19, 10:04 UTC30m
2026-06-19 GCKFG - Jun 19, 08:24 UTCJun 19, 08:54 UTC30m
2026-06-19 GCKFG - Jun 19, 05:24 UTCJun 19, 07:49 UTC2h 25m
2026-06-19 GCKFG - Jun 19, 04:34 UTCJun 19, 05:09 UTC35m
2026-06-17 GCKFG - Jun 17, 16:25 UTCJun 17, 16:50 UTC25m
2026-06-17 GCKFG - Jun 17, 13:50 UTCJun 17, 14:10 UTC20m
2026-06-17 GCKFG - Jun 17, 13:00 UTCJun 17, 13:40 UTC40m
2026-06-16 GCKFG - Jun 16, 15:09 UTCJun 16, 15:35 UTC25m
2026-06-16 GCKFG - Jun 16, 14:25 UTCJun 16, 14:30 UTC5m
2026-06-16 GCKFG - Jun 16, 11:55 UTCJun 16, 12:05 UTC10m
2026-06-10 GCKFG - Jun 10, 12:50 UTCJun 10, 13:55 UTC1h 5m
2026-06-10 GCKFG - Jun 10, 11:50 UTCJun 10, 11:55 UTC5m
2026-06-10 GCKFG - Jun 10, 10:50 UTCJun 10, 11:10 UTC20m
2026-05-28 GCKFG - May 28, 12:05 UTCMay 28, 12:10 UTC5m
2026-05-28 GCKFG - May 28, 10:40 UTCMay 28, 10:45 UTC5m

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 G-CKFG page for operator, model, and routing details .

Mode-S 4058E2 frequently asked

What is Mode-S code 4058E2?
4058E2 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CKFG.
Where is Mode-S 4058E2 registered?
Mode-S code 4058E2 is allocated to United Kingdom (GB). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4058E2 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4058E2, octal 20054342, decimal 4,217,058.
What flights does 4058E2 operate?
Mode-S 4058E2 has broadcast 1 distinct callsign, including GCKFG.