Apparatus

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sensors Mode-S transponder

407657

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-MCSJ · SIKORSKY S-92 Helibus

Hex
407657
Octal
20073127
Decimal
4,224,599
Country
GB
Tail
G-MCSJ
Type
S92
No current signal · last broadcast 3d ago
Flights observed
272
Distinct callsigns
20
Country
GB
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S 407657.

Country allocation

The ICAO 24-bit address 407657 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 20 distinct

Callsign Airline Flights Last seen
ULR94Y - 56 2026-07-02
ULR97T - 53 2026-07-02
ULR95K - 26 2026-07-10
ULR85A - 23 2026-07-06
ULR91R - 22 2026-07-09
ULR96G - 13 2026-06-09
ULR95Z - 12 2026-05-29
ULR86X - 12 2026-07-06
ULR99A - 7 2026-07-09
ULR96E - 6 2026-07-06
ULR84S - 6 2026-05-30
ULR99B - 4 2026-07-03
ULR95W - 4 2026-07-01
ULR92T - 4 2026-06-28
ULR84C - 4 2026-06-03
ULR97S - 2 2026-06-10
ULR95G - 2 2026-06-17
ULR91N - 2 2026-07-10
ULR87Z - 2 2026-06-13
ULR87E - 2 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 ULR91N - Jul 10, 16:05 UTCJul 10, 16:30 UTC25m
2026-07-10 ULR91N - Jul 10, 14:45 UTCJul 10, 15:25 UTC40m
2026-07-10 ULR95K - Jul 10, 12:05 UTCJul 10, 13:25 UTC1h 20m
2026-07-10 ULR95K - Jul 10, 10:05 UTCJul 10, 11:30 UTC1h 25m
2026-07-09 ULR99A - Jul 9, 18:50 UTCJul 9, 19:00 UTC10m
2026-07-09 ULR99A - Jul 9, 13:25 UTCJul 9, 13:50 UTC25m
2026-07-09 ULR91R - Jul 9, 11:45 UTCJul 9, 12:05 UTC20m
2026-07-09 ULR91R - Jul 9, 07:30 UTCJul 9, 07:40 UTC10m
2026-07-08 ULR91R - Jul 8, 10:35 UTCJul 8, 11:05 UTC30m
2026-07-08 ULR91R - Jul 8, 07:05 UTCJul 8, 07:35 UTC30m
2026-07-07 ULR91R - Jul 7, 11:05 UTCJul 7, 11:25 UTC20m
2026-07-07 ULR91R - Jul 7, 07:00 UTCJul 7, 07:30 UTC30m
2026-07-06 ULR96E - Jul 6, 15:50 UTCJul 6, 16:25 UTC35m
2026-07-06 ULR96E - Jul 6, 14:25 UTCJul 6, 14:55 UTC30m
2026-07-06 ULR86X - Jul 6, 12:35 UTCJul 6, 13:10 UTC35m
2026-07-06 ULR86X - Jul 6, 10:20 UTCJul 6, 10:50 UTC30m
2026-07-06 ULR85A - Jul 6, 08:20 UTCJul 6, 08:45 UTC25m
2026-07-06 ULR85A - Jul 6, 06:35 UTCJul 6, 07:10 UTC35m
2026-07-03 ULR99B - Jul 3, 14:50 UTCJul 3, 15:10 UTC20m
2026-07-03 ULR99B - Jul 3, 10:15 UTCJul 3, 10:45 UTC30m
2026-07-03 ULR85A - Jul 3, 06:30 UTCJul 3, 07:05 UTC35m
2026-07-02 ULR85A - Jul 2, 17:10 UTCJul 2, 17:40 UTC30m
2026-07-02 ULR85A - Jul 2, 15:20 UTCJul 2, 16:00 UTC40m
2026-07-02 ULR94Y - Jul 2, 13:10 UTCJul 2, 14:30 UTC1h 20m
2026-07-02 ULR94Y - Jul 2, 10:45 UTCJul 2, 11:35 UTC50m
2026-07-02 ULR97T - Jul 2, 08:50 UTCJul 2, 10:15 UTC1h 25m
2026-07-02 ULR97T - Jul 2, 06:20 UTCJul 2, 07:00 UTC40m
2026-07-01 ULR95W - Jul 1, 16:05 UTCJul 1, 16:45 UTC40m
2026-07-01 ULR95W - Jul 1, 14:20 UTCJul 1, 14:40 UTC20m
2026-07-01 ULR97T - Jul 1, 09:45 UTCJul 1, 11:00 UTC1h 15m
2026-07-01 ULR97T - Jul 1, 07:00 UTCJul 1, 08:15 UTC1h 15m
2026-06-30 ULR94Y - Jun 30, 13:20 UTCJun 30, 14:20 UTC1h 0m
2026-06-30 ULR94Y - Jun 30, 10:35 UTCJun 30, 11:50 UTC1h 15m
2026-06-30 ULR97T - Jun 30, 09:05 UTCJun 30, 10:00 UTC55m
2026-06-30 ULR97T - Jun 30, 06:25 UTCJun 30, 07:30 UTC1h 5m
2026-06-29 ULR95W - Jun 29, 16:00 UTCJun 29, 16:29 UTC30m
2026-06-29 ULR95W - Jun 29, 14:09 UTCJun 29, 14:44 UTC35m
2026-06-29 ULR86X - Jun 29, 12:39 UTCJun 29, 13:00 UTC20m
2026-06-29 ULR86X - Jun 29, 10:10 UTCJun 29, 10:44 UTC35m
2026-06-29 ULR85A - Jun 29, 08:24 UTCJun 29, 08:54 UTC30m
2026-06-29 ULR85A - Jun 29, 06:34 UTCJun 29, 07:15 UTC40m
2026-06-28 ULR92T - Jun 28, 14:34 UTCJun 28, 14:50 UTC15m
2026-06-28 ULR92T - Jun 28, 10:39 UTCJun 28, 11:09 UTC30m
2026-06-27 ULR94Y - Jun 27, 08:39 UTCJun 27, 09:44 UTC1h 5m
2026-06-27 ULR94Y - Jun 27, 06:09 UTCJun 27, 07:15 UTC1h 5m
2026-06-26 ULR412B - Jun 26, 14:15 UTCJun 26, 14:35 UTC20m
2026-06-26 ULR412A ABZ → ABZ Jun 26, 11:24 UTCJun 26, 11:49 UTC25m
2026-06-18 ULR88M - Jun 18, 18:10 UTCJun 18, 18:35 UTC25m
2026-06-18 ULR94Y - Jun 18, 14:05 UTCJun 18, 16:10 UTC2h 5m
2026-06-18 ULR94Y - Jun 18, 11:30 UTCJun 18, 12:35 UTC1h 5m

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

Mode-S 407657 frequently asked

What is Mode-S code 407657?
407657 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-MCSJ.
Where is Mode-S 407657 registered?
Mode-S code 407657 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 407657 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 407657, octal 20073127, decimal 4,224,599.
What flights does 407657 operate?
Mode-S 407657 has broadcast 20 distinct callsigns, including ULR94Y, ULR97T, ULR95K, ULR85A, ULR91R.