Apparatus

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sensors Mode-S transponder

4017CD

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-AWTL · PIPER PA-28-140/150/160/180

Hex
4017CD
Octal
20013715
Decimal
4,200,397
Country
GB
Tail
G-AWTL
Type
P28A
No current signal · last broadcast 2h ago
Flights observed
89
Distinct callsigns
1
Country
GB
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4017CD.

Country allocation

The ICAO 24-bit address 4017CD 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
GRVNX - 89 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 GRVNX - Jul 5, 12:00 UTCJul 5, 12:45 UTC45m
2026-07-04 GRVNX LPL → LPL Jul 4, 14:35 UTCJul 4, 15:25 UTC50m
2026-07-04 GRVNX - Jul 4, 12:30 UTCJul 4, 13:20 UTC50m
2026-07-03 GRVNX LPL → LPL Jul 3, 14:20 UTCJul 3, 15:10 UTC50m
2026-07-03 GRVNX - Jul 3, 11:55 UTCJul 3, 12:50 UTC55m
2026-07-03 GRVNX - Jul 3, 08:45 UTCJul 3, 09:40 UTC55m
2026-06-30 GRVNX - Jun 30, 12:55 UTCJun 30, 13:35 UTC40m
2026-06-27 GRVNX - Jun 27, 14:05 UTCJun 27, 15:24 UTC1h 20m
2026-06-27 GRVNX - Jun 27, 10:34 UTCJun 27, 11:20 UTC45m
2026-06-26 GRVNX - Jun 26, 11:34 UTCJun 26, 12:10 UTC35m
2026-06-26 GRVNX - Jun 26, 08:05 UTCJun 26, 09:10 UTC1h 5m
2026-06-25 GRVNX - Jun 25, 12:50 UTCJun 25, 14:14 UTC1h 25m
2026-06-25 GRVNX - Jun 25, 10:39 UTCJun 25, 11:44 UTC1h 5m
2026-06-25 GRVNX LPL → LPL Jun 25, 08:09 UTCJun 25, 09:29 UTC1h 20m
2026-06-24 GRVNX - Jun 24, 18:09 UTCJun 24, 18:50 UTC40m
2026-06-23 GRVNX - Jun 23, 10:24 UTCJun 23, 11:19 UTC55m
2026-06-21 GRVNX - Jun 21, 10:19 UTCJun 21, 11:30 UTC1h 10m
2026-06-20 GRVNX LPL → LPL Jun 20, 16:05 UTCJun 20, 17:04 UTC1h 0m
2026-06-20 GRVNX LPL → LPL Jun 20, 14:19 UTCJun 20, 15:14 UTC55m
2026-06-20 GRVNX - Jun 20, 12:09 UTCJun 20, 12:50 UTC40m
2026-06-20 GRVNX - Jun 20, 10:25 UTCJun 20, 11:09 UTC45m
2026-06-20 GRVNX - Jun 20, 08:29 UTCJun 20, 09:34 UTC1h 5m
2026-06-19 GRVNX - Jun 19, 16:49 UTCJun 19, 17:39 UTC50m
2026-06-19 GRVNX - Jun 19, 15:04 UTCJun 19, 15:54 UTC50m
2026-06-19 GRVNX - Jun 19, 12:04 UTCJun 19, 12:49 UTC45m
2026-06-19 GRVNX LPL → LPL Jun 19, 08:29 UTCJun 19, 09:14 UTC45m
2026-06-18 GRVNX - Jun 18, 16:20 UTCJun 18, 17:05 UTC45m
2026-06-18 GRVNX LPL → LPL Jun 18, 12:05 UTCJun 18, 12:45 UTC40m
2026-06-18 GRVNX - Jun 18, 11:10 UTCJun 18, 11:25 UTC15m
2026-06-18 GRVNX - Jun 18, 10:35 UTCJun 18, 11:05 UTC30m
2026-06-18 GRVNX - Jun 18, 09:15 UTCJun 18, 09:35 UTC20m
2026-06-18 GRVNX - Jun 18, 08:35 UTCJun 18, 09:00 UTC25m
2026-06-17 GRVNX - Jun 17, 16:50 UTCJun 17, 17:15 UTC25m
2026-06-14 GRVNX - Jun 14, 14:40 UTCJun 14, 15:25 UTC45m
2026-06-12 GRVNX - Jun 12, 15:30 UTCJun 12, 15:40 UTC10m
2026-06-12 GRVNX - Jun 12, 14:45 UTCJun 12, 15:25 UTC40m
2026-06-12 GRVNX - Jun 12, 12:40 UTCJun 12, 13:35 UTC55m
2026-06-12 GRVNX - Jun 12, 10:10 UTCJun 12, 11:10 UTC1h 0m
2026-06-10 GRVNX - Jun 10, 10:30 UTCJun 10, 11:20 UTC50m
2026-06-09 GRVNX - Jun 9, 14:15 UTCJun 9, 14:25 UTC10m
2026-06-09 GRVNX - Jun 9, 08:20 UTCJun 9, 09:20 UTC1h 0m
2026-06-08 GRVNX - Jun 8, 14:30 UTCJun 8, 15:04 UTC35m
2026-06-08 GRVNX - Jun 8, 08:35 UTCJun 8, 09:10 UTC35m
2026-06-07 GRVNX - Jun 7, 10:50 UTCJun 7, 11:00 UTC10m
2026-06-07 GRVNX - Jun 7, 08:25 UTCJun 7, 10:00 UTC1h 35m
2026-06-06 GRVNX - Jun 6, 14:20 UTCJun 6, 14:45 UTC25m
2026-06-06 GRVNX - Jun 6, 12:30 UTCJun 6, 13:30 UTC1h 0m
2026-06-05 GRVNX - Jun 5, 14:15 UTCJun 5, 15:00 UTC45m
2026-06-05 GRVNX - Jun 5, 10:10 UTCJun 5, 10:40 UTC30m
2026-06-04 GRVNX - Jun 4, 15:00 UTCJun 4, 15:40 UTC40m

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

Mode-S 4017CD frequently asked

What is Mode-S code 4017CD?
4017CD is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-AWTL.
Where is Mode-S 4017CD registered?
Mode-S code 4017CD 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 4017CD broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4017CD, octal 20013715, decimal 4,200,397.
What flights does 4017CD operate?
Mode-S 4017CD has broadcast 1 distinct callsign, including GRVNX.