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sensors Mode-S transponder

407685

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
407685
Octal
20073205
Decimal
4,224,645
Country
GB
Tail
G-EMSS
Type
EC45
No current signal · last broadcast Jul 25, 20:50 UTC
Flights observed
338
Distinct callsigns
6
Country
GB
Last broadcast
Jul 25, 20:50 UTC

Last known position

Most recent position reported by Mode-S 407685.

Country allocation

The ICAO 24-bit address 407685 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 6 distinct

Callsign Airline Flights Last seen
HLE88 - 224 2026-07-22
HLE85 - 96 2026-07-19
HLE09 - 11 2026-07-25
RHD62 - 3 2026-07-23
RHD01 - 3 2026-07-02
RHD60 - 1 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 HLE09 - Jul 25, 20:40 UTCJul 25, 20:50 UTC10m
2026-07-25 HLE09 - Jul 25, 19:45 UTCJul 25, 20:00 UTC15m
2026-07-25 HLE09 - Jul 25, 18:45 UTCJul 25, 19:05 UTC20m
2026-07-25 HLE09 - Jul 25, 15:35 UTCJul 25, 15:55 UTC20m
2026-07-25 HLE09 - Jul 25, 14:15 UTCJul 25, 15:05 UTC50m
2026-07-25 HLE09 - Jul 25, 12:45 UTCJul 25, 13:05 UTC20m
2026-07-24 HLE09 - Jul 24, 20:05 UTCJul 24, 20:15 UTC10m
2026-07-24 HLE09 - Jul 24, 19:15 UTCJul 24, 19:25 UTC10m
2026-07-24 HLE09 - Jul 24, 17:50 UTCJul 24, 18:10 UTC20m
2026-07-23 HLE09 - Jul 23, 19:50 UTCJul 23, 20:05 UTC15m
2026-07-23 HLE09 - Jul 23, 18:50 UTCJul 23, 19:05 UTC15m
2026-07-23 RHD62 - Jul 23, 09:30 UTCJul 23, 10:25 UTC55m
2026-07-22 HLE88 - Jul 22, 19:05 UTCJul 22, 19:25 UTC20m
2026-07-22 HLE88 - Jul 22, 17:20 UTCJul 22, 17:40 UTC20m
2026-07-22 HLE88 - Jul 22, 13:10 UTCJul 22, 13:20 UTC10m
2026-07-21 HLE88 - Jul 21, 16:30 UTCJul 21, 16:40 UTC10m
2026-07-21 HLE88 - Jul 21, 14:35 UTCJul 21, 14:50 UTC15m
2026-07-20 HLE88 - Jul 20, 15:10 UTCJul 20, 15:25 UTC15m
2026-07-20 HLE88 - Jul 20, 12:25 UTCJul 20, 12:40 UTC15m
2026-07-20 HLE88 CBG → CBG Jul 20, 07:50 UTCJul 20, 08:10 UTC20m
2026-07-19 HLE88 - Jul 19, 17:05 UTCJul 19, 17:25 UTC20m
2026-07-19 HLE88 - Jul 19, 16:05 UTCJul 19, 16:15 UTC10m
2026-07-19 HLE88 - Jul 19, 14:50 UTCJul 19, 15:10 UTC20m
2026-07-19 RHD62 - Jul 19, 13:50 UTCJul 19, 14:05 UTC15m
2026-07-19 RHD62 NWI → CBG Jul 19, 11:45 UTCJul 19, 12:15 UTC30m
2026-07-19 HLE85 - Jul 19, 00:10 UTCJul 19, 00:35 UTC25m
2026-07-18 HLE88 - Jul 18, 17:25 UTCJul 18, 17:35 UTC10m
2026-07-17 HLE88 - Jul 17, 18:05 UTCJul 17, 18:55 UTC50m
2026-07-17 HLE88 - Jul 17, 17:20 UTCJul 17, 17:30 UTC10m
2026-07-16 HLE88 - Jul 16, 18:25 UTCJul 16, 18:34 UTC10m
2026-07-16 HLE88 - Jul 16, 16:49 UTCJul 16, 17:10 UTC20m
2026-07-16 HLE88 - Jul 16, 15:45 UTCJul 16, 16:00 UTC15m
2026-07-16 HLE88 - Jul 16, 13:00 UTCJul 16, 13:15 UTC15m
2026-07-15 HLE88 - Jul 15, 14:50 UTCJul 15, 15:35 UTC45m
2026-07-14 HLE88 CBG → CBG Jul 14, 17:45 UTCJul 14, 18:20 UTC35m
2026-07-14 HLE88 - Jul 14, 15:50 UTCJul 14, 16:40 UTC50m
2026-07-14 HLE88 - Jul 14, 13:50 UTCJul 14, 14:10 UTC20m
2026-07-14 HLE88 - Jul 14, 09:35 UTCJul 14, 10:00 UTC25m
2026-07-14 HLE88 - Jul 14, 08:25 UTCJul 14, 08:35 UTC10m
2026-07-14 HLE88 - Jul 14, 06:45 UTCJul 14, 07:00 UTC15m
2026-07-13 HLE88 - Jul 13, 15:50 UTCJul 13, 16:20 UTC30m
2026-07-13 HLE88 - Jul 13, 15:00 UTCJul 13, 15:10 UTC10m
2026-07-13 HLE88 - Jul 13, 13:50 UTCJul 13, 14:10 UTC20m
2026-07-13 HLE88 - Jul 13, 12:40 UTCJul 13, 12:50 UTC10m
2026-07-13 HLE88 - Jul 13, 11:05 UTCJul 13, 11:30 UTC25m
2026-07-12 HLE88 - Jul 12, 19:01 UTCJul 12, 19:40 UTC40m
2026-07-12 HLE88 - Jul 12, 17:50 UTCJul 12, 18:10 UTC20m
2026-07-12 HLE88 - Jul 12, 16:35 UTCJul 12, 16:55 UTC20m
2026-07-12 HLE88 - Jul 12, 14:25 UTCJul 12, 15:15 UTC50m
2026-07-12 HLE88 NWI → CBG Jul 12, 12:50 UTCJul 12, 13:40 UTC50m

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

Mode-S 407685 frequently asked

What is Mode-S code 407685?
407685 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-EMSS.
Where is Mode-S 407685 registered?
Mode-S code 407685 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 407685 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407685, octal 20073205, decimal 4,224,645.
What flights does 407685 operate?
Mode-S 407685 has broadcast 6 distinct callsigns, including HLE88, HLE85, HLE09, RHD62, RHD01.