Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

407DC0

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-YAAA · AIRBUS HELICOPTERS EC-145

Hex
407DC0
Octal
20076700
Decimal
4,226,496
Country
GB
Tail
G-YAAA
Type
EC45
No current signal · last broadcast 3d ago
Flights observed
431
Distinct callsigns
3
Country
GB
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 407DC0.

Country allocation

The ICAO 24-bit address 407DC0 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 3 distinct

Callsign Airline Flights Last seen
HLE98 - 392 2026-07-26
HLE99 - 34 2026-06-28
HLE97 - 5 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HLE98 - Jul 26, 15:45 UTCJul 26, 16:00 UTC15m
2026-07-26 HLE98 - Jul 26, 14:05 UTCJul 26, 14:35 UTC30m
2026-07-26 HLE98 - Jul 26, 10:00 UTCJul 26, 10:10 UTC10m
2026-07-26 HLE98 - Jul 26, 09:30 UTCJul 26, 09:45 UTC15m
2026-07-25 HLE98 - Jul 25, 18:05 UTCJul 25, 18:15 UTC10m
2026-07-25 HLE98 - Jul 25, 16:55 UTCJul 25, 17:10 UTC15m
2026-07-25 HLE98 - Jul 25, 15:35 UTCJul 25, 15:50 UTC15m
2026-07-25 HLE98 - Jul 25, 13:40 UTCJul 25, 13:55 UTC15m
2026-07-25 HLE98 - Jul 25, 12:45 UTCJul 25, 12:55 UTC10m
2026-07-24 HLE98 - Jul 24, 16:40 UTCJul 24, 16:50 UTC10m
2026-07-24 HLE98 - Jul 24, 15:35 UTCJul 24, 15:45 UTC10m
2026-07-24 HLE98 - Jul 24, 14:15 UTCJul 24, 14:40 UTC25m
2026-07-23 HLE98 - Jul 23, 22:40 UTCJul 23, 22:50 UTC10m
2026-07-23 HLE98 - Jul 23, 21:20 UTCJul 23, 21:35 UTC15m
2026-07-23 HLE98 - Jul 23, 12:50 UTCJul 23, 13:25 UTC35m
2026-07-23 HLE98 - Jul 23, 09:35 UTCJul 23, 09:50 UTC15m
2026-07-22 HLE98 - Jul 22, 16:30 UTCJul 22, 16:50 UTC20m
2026-07-22 HLE98 - Jul 22, 13:15 UTCJul 22, 14:00 UTC45m
2026-07-22 HLE98 - Jul 22, 11:45 UTCJul 22, 12:00 UTC15m
2026-07-21 HLE98 - Jul 21, 21:50 UTCJul 21, 22:00 UTC10m
2026-07-21 HLE98 - Jul 21, 21:35 UTCJul 21, 21:45 UTC10m
2026-07-21 HLE98 - Jul 21, 19:35 UTCJul 21, 19:45 UTC10m
2026-07-21 HLE98 - Jul 21, 17:10 UTCJul 21, 18:00 UTC50m
2026-07-21 HLE98 - Jul 21, 14:30 UTCJul 21, 14:40 UTC10m
2026-07-20 HLE98 - Jul 20, 15:45 UTCJul 20, 17:05 UTC1h 20m
2026-07-20 HLE98 - Jul 20, 13:55 UTCJul 20, 14:05 UTC10m
2026-07-20 HLE98 - Jul 20, 11:35 UTCJul 20, 12:00 UTC25m
2026-07-20 HLE98 - Jul 20, 10:50 UTCJul 20, 11:00 UTC10m
2026-07-20 HLE98 - Jul 20, 10:20 UTCJul 20, 10:30 UTC10m
2026-07-20 HLE98 - Jul 20, 09:35 UTCJul 20, 09:45 UTC10m
2026-07-19 HLE98 - Jul 19, 14:05 UTCJul 19, 15:05 UTC1h 0m
2026-07-18 HLE98 - Jul 18, 10:30 UTCJul 18, 10:45 UTC15m
2026-07-18 HLE98 - Jul 18, 09:40 UTCJul 18, 09:55 UTC15m
2026-07-17 HLE98 - Jul 17, 20:50 UTCJul 17, 21:05 UTC15m
2026-07-17 HLE98 - Jul 17, 20:04 UTCJul 17, 20:20 UTC15m
2026-07-17 HLE98 - Jul 17, 19:20 UTCJul 17, 20:00 UTC40m
2026-07-17 HLE98 - Jul 17, 14:44 UTCJul 17, 15:00 UTC15m
2026-07-17 HLE98 - Jul 17, 13:29 UTCJul 17, 13:45 UTC15m
2026-07-17 HLE98 - Jul 17, 12:35 UTCJul 17, 12:45 UTC10m
2026-07-16 HLE98 - Jul 16, 22:30 UTCJul 16, 22:40 UTC10m
2026-07-16 HLE98 - Jul 16, 20:55 UTCJul 16, 21:35 UTC40m
2026-07-16 HLE98 - Jul 16, 18:25 UTCJul 16, 18:40 UTC15m
2026-07-16 HLE98 - Jul 16, 17:14 UTCJul 16, 17:30 UTC15m
2026-07-16 HLE98 - Jul 16, 16:00 UTCJul 16, 16:40 UTC40m
2026-07-16 HLE98 - Jul 16, 15:35 UTCJul 16, 15:45 UTC10m
2026-07-16 HLE98 - Jul 16, 14:55 UTCJul 16, 15:05 UTC10m
2026-07-16 HLE98 - Jul 16, 12:25 UTCJul 16, 12:44 UTC20m
2026-07-16 HLE98 - Jul 16, 11:45 UTCJul 16, 12:00 UTC15m
2026-07-16 HLE98 - Jul 16, 10:25 UTCJul 16, 10:45 UTC20m
2026-07-15 HLE98 - Jul 15, 21:15 UTCJul 15, 21:50 UTC35m

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

Mode-S 407DC0 frequently asked

What is Mode-S code 407DC0?
407DC0 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-YAAA.
Where is Mode-S 407DC0 registered?
Mode-S code 407DC0 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 407DC0 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407DC0, octal 20076700, decimal 4,226,496.
What flights does 407DC0 operate?
Mode-S 407DC0 has broadcast 3 distinct callsigns, including HLE98, HLE99, HLE97.