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sensors Mode-S transponder

4021CA

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-FLIP · CESSNA 152

Hex
4021CA
Octal
20020712
Decimal
4,202,954
Country
GB
Tail
G-FLIP
Type
C152
No current signal · last broadcast 20h ago
Flights observed
166
Distinct callsigns
1
Country
GB
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 4021CA.

Country allocation

The ICAO 24-bit address 4021CA 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
INV05 - 166 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 INV05 - Jul 17, 13:45 UTCJul 17, 14:15 UTC30m
2026-07-17 INV05 - Jul 17, 11:45 UTCJul 17, 12:35 UTC50m
2026-07-17 INV05 - Jul 17, 08:35 UTCJul 17, 10:05 UTC1h 30m
2026-07-16 INV05 RCS → RCS Jul 16, 16:09 UTCJul 16, 16:35 UTC25m
2026-07-16 INV05 - Jul 16, 14:35 UTCJul 16, 15:14 UTC40m
2026-07-16 INV05 - Jul 16, 13:05 UTCJul 16, 14:00 UTC55m
2026-07-16 INV05 RCS → RCS Jul 16, 09:15 UTCJul 16, 10:45 UTC1h 30m
2026-07-15 INV05 - Jul 15, 12:25 UTCJul 15, 14:25 UTC2h 0m
2026-07-14 INV05 - Jul 14, 16:20 UTCJul 14, 16:50 UTC30m
2026-07-12 INV05 RCS → RCS Jul 12, 14:15 UTCJul 12, 15:25 UTC1h 10m
2026-07-12 INV05 - Jul 12, 10:40 UTCJul 12, 12:55 UTC2h 15m
2026-07-10 INV05 - Jul 10, 14:15 UTCJul 10, 15:10 UTC55m
2026-07-10 INV05 - Jul 10, 11:55 UTCJul 10, 13:10 UTC1h 15m
2026-07-05 INV05 - Jul 5, 15:20 UTCJul 5, 16:05 UTC45m
2026-07-05 INV05 - Jul 5, 10:40 UTCJul 5, 12:45 UTC2h 5m
2026-07-04 INV05 - Jul 4, 14:00 UTCJul 4, 14:30 UTC30m
2026-07-03 INV05 RCS → RCS Jul 3, 15:50 UTCJul 3, 17:20 UTC1h 30m
2026-07-02 INV05 RCS → RCS Jul 2, 15:20 UTCJul 2, 16:25 UTC1h 5m
2026-06-30 INV05 RCS → RCS Jun 30, 11:15 UTCJun 30, 12:25 UTC1h 10m
2026-06-29 INV05 RCS → RCS Jun 29, 17:14 UTCJun 29, 17:59 UTC45m
2026-06-28 INV05 RCS → RCS Jun 28, 13:19 UTCJun 28, 15:05 UTC1h 45m
2026-06-28 INV05 RCS → RCS Jun 28, 10:35 UTCJun 28, 11:55 UTC1h 20m
2026-06-28 INV05 - Jun 28, 08:00 UTCJun 28, 09:05 UTC1h 5m
2026-06-27 INV05 - Jun 27, 11:59 UTCJun 27, 13:20 UTC1h 20m
2026-06-27 INV05 - Jun 27, 10:54 UTCJun 27, 11:25 UTC30m
2026-06-27 INV05 - Jun 27, 08:55 UTCJun 27, 10:05 UTC1h 10m
2026-06-27 INV05 RCS → LYX Jun 27, 07:49 UTCJun 27, 08:14 UTC25m
2026-06-26 INV05 - Jun 26, 16:44 UTCJun 26, 17:40 UTC55m
2026-06-26 INV05 RCS → RCS Jun 26, 14:25 UTCJun 26, 15:05 UTC40m
2026-06-26 INV05 RCS → RCS Jun 26, 12:00 UTCJun 26, 13:34 UTC1h 35m
2026-06-26 INV05 - Jun 26, 08:30 UTCJun 26, 10:20 UTC1h 50m
2026-06-25 INV05 RCS → RCS Jun 25, 12:54 UTCJun 25, 14:44 UTC1h 50m
2026-06-25 INV05 - Jun 25, 10:55 UTCJun 25, 12:10 UTC1h 15m
2026-06-25 INV05 - Jun 25, 09:45 UTCJun 25, 10:20 UTC35m
2026-06-25 INV05 - Jun 25, 07:54 UTCJun 25, 08:50 UTC55m
2026-06-24 INV05 - Jun 24, 13:44 UTCJun 24, 14:09 UTC25m
2026-06-24 INV05 - Jun 24, 09:00 UTCJun 24, 11:20 UTC2h 20m
2026-06-23 INV05 - Jun 23, 15:44 UTCJun 23, 16:59 UTC1h 15m
2026-06-23 INV05 - Jun 23, 13:15 UTCJun 23, 13:34 UTC20m
2026-06-23 INV05 - Jun 23, 11:24 UTCJun 23, 12:25 UTC1h 0m
2026-06-23 INV05 RCS → RCS Jun 23, 08:39 UTCJun 23, 09:49 UTC1h 10m
2026-06-22 INV05 RCS → RCS Jun 22, 15:45 UTCJun 22, 16:05 UTC20m
2026-06-22 INV05 RCS → LYX Jun 22, 12:25 UTCJun 22, 14:05 UTC1h 40m
2026-06-20 INV05 - Jun 20, 15:29 UTCJun 20, 16:24 UTC55m
2026-06-20 INV05 RCS → RCS Jun 20, 09:49 UTCJun 20, 11:20 UTC1h 30m
2026-06-19 INV05 - Jun 19, 13:39 UTCJun 19, 14:59 UTC1h 20m
2026-06-19 INV05 - Jun 19, 12:29 UTCJun 19, 12:44 UTC15m
2026-06-19 INV05 - Jun 19, 09:55 UTCJun 19, 11:54 UTC2h 0m
2026-06-18 INV05 - Jun 18, 13:00 UTCJun 18, 14:30 UTC1h 30m
2026-06-17 INV05 - Jun 17, 12:55 UTCJun 17, 13:05 UTC10m

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

Mode-S 4021CA frequently asked

What is Mode-S code 4021CA?
4021CA is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-FLIP.
Where is Mode-S 4021CA registered?
Mode-S code 4021CA 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 4021CA broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4021CA, octal 20020712, decimal 4,202,954.
What flights does 4021CA operate?
Mode-S 4021CA has broadcast 1 distinct callsign, including INV05.