Apparatus

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sensors Mode-S transponder

4004FE

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-MACY · BOEING 767-200

Hex
4004FE
Octal
20002376
Decimal
4,195,582
Country
GB
Tail
G-MACY
Type
B762
No current signal · last broadcast 13d ago
Flights observed
220
Distinct callsigns
10
Country
GB
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S 4004FE.

Country allocation

The ICAO 24-bit address 4004FE 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 10 distinct

Callsign Airline Flights Last seen
MUK6565 - 46 2026-07-24
MUK6566 - 45 2026-07-24
MUK6977 - 27 2026-07-23
MUK6978 - 26 2026-07-23
SRR6566 - 23 2026-06-28
SRR6565 - 21 2026-06-26
SRR6978 - 15 2026-06-30
SRR6977 - 13 2026-06-30
UPS207 - 2 2026-06-18
SRR9072 Star Air 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 MUK6565 EMA → CGN Jul 24, 21:50 UTCJul 24, 22:50 UTC1h 0m
2026-07-24 MUK6565 EDI → EMA Jul 24, 19:20 UTCJul 24, 20:05 UTC45m
2026-07-24 MUK6566 EMA → EDI Jul 24, 04:40 UTCJul 24, 05:25 UTC45m
2026-07-24 MUK6566 CGN → EMA Jul 24, 01:40 UTCJul 24, 02:40 UTC1h 0m
2026-07-23 MUK6977 EMA → CGN Jul 23, 22:00 UTCJul 23, 23:05 UTC1h 5m
2026-07-23 MUK6977 - Jul 23, 18:55 UTCJul 23, 19:35 UTC40m
2026-07-23 MUK6978 EMA → BFS Jul 23, 03:45 UTCJul 23, 04:25 UTC40m
2026-07-23 MUK6978 CGN → EMA Jul 23, 01:00 UTCJul 23, 02:00 UTC1h 0m
2026-07-22 MUK6565 EMA → CGN Jul 22, 21:50 UTCJul 22, 23:05 UTC1h 15m
2026-07-22 MUK6565 EDI → EMA Jul 22, 19:20 UTCJul 22, 20:10 UTC50m
2026-07-22 MUK6566 EMA → EDI Jul 22, 04:40 UTCJul 22, 05:25 UTC45m
2026-07-22 MUK6566 CGN → EMA Jul 22, 01:50 UTCJul 22, 02:50 UTC1h 0m
2026-07-21 MUK6977 EMA → CGN Jul 21, 22:05 UTCJul 21, 23:05 UTC1h 0m
2026-07-21 MUK6977 - Jul 21, 19:05 UTCJul 21, 19:45 UTC40m
2026-07-21 MUK6978 EMA → BFS Jul 21, 03:50 UTCJul 21, 04:30 UTC40m
2026-07-21 MUK6978 CGN → EMA Jul 21, 01:00 UTCJul 21, 02:00 UTC1h 0m
2026-07-20 MUK6565 EMA → CGN Jul 20, 22:05 UTCJul 20, 23:15 UTC1h 10m
2026-07-20 MUK6565 - Jul 20, 19:30 UTCJul 20, 20:10 UTC40m
2026-07-20 MUK6566 EMA → EDI Jul 20, 03:35 UTCJul 20, 04:20 UTC45m
2026-07-19 MUK6566 CGN → EMA Jul 19, 22:25 UTCJul 19, 23:25 UTC1h 0m
2026-07-17 MUK6977 EMA → CGN Jul 17, 21:50 UTCJul 17, 23:14 UTC1h 25m
2026-07-17 MUK6977 - Jul 17, 18:55 UTCJul 17, 19:30 UTC35m
2026-07-17 MUK6978 EMA → BFS Jul 17, 03:50 UTCJul 17, 04:29 UTC40m
2026-07-17 MUK6978 CGN → EMA Jul 17, 01:05 UTCJul 17, 02:05 UTC1h 0m
2026-07-16 MUK6565 EMA → CGN Jul 16, 21:30 UTCJul 16, 22:35 UTC1h 5m
2026-07-16 MUK6565 EDI → EMA Jul 16, 19:25 UTCJul 16, 20:05 UTC40m
2026-07-16 MUK6566 EMA → EDI Jul 16, 04:55 UTCJul 16, 05:30 UTC35m
2026-07-16 MUK6566 CGN → EMA Jul 16, 01:45 UTCJul 16, 02:50 UTC1h 5m
2026-07-15 MUK6565 EMA → CGN Jul 15, 22:00 UTCJul 15, 23:15 UTC1h 15m
2026-07-15 MUK6565 EDI → EMA Jul 15, 19:25 UTCJul 15, 20:05 UTC40m
2026-07-15 MUK6566 EMA → EDI Jul 15, 04:55 UTCJul 15, 05:35 UTC40m
2026-07-15 MUK6566 CGN → EMA Jul 15, 01:45 UTCJul 15, 02:45 UTC1h 0m
2026-07-14 MUK6977 EMA → CGN Jul 14, 22:00 UTCJul 14, 23:10 UTC1h 9m
2026-07-14 MUK6977 - Jul 14, 19:00 UTCJul 14, 19:40 UTC40m
2026-07-14 MUK6978 EMA → BFS Jul 14, 03:50 UTCJul 14, 04:30 UTC40m
2026-07-14 MUK6978 CGN → EMA Jul 14, 01:05 UTCJul 14, 02:10 UTC1h 5m
2026-07-13 MUK6565 EMA → CGN Jul 13, 21:45 UTCJul 13, 23:00 UTC1h 15m
2026-07-13 MUK6565 - Jul 13, 19:20 UTCJul 13, 20:00 UTC40m
2026-07-13 MUK6566 EMA → EDI Jul 13, 03:30 UTCJul 13, 04:15 UTC45m
2026-07-12 MUK6566 CGN → EMA Jul 12, 22:15 UTCJul 12, 23:20 UTC1h 5m
2026-07-10 MUK6565 EMA → CGN Jul 10, 21:40 UTCJul 10, 22:45 UTC1h 5m
2026-07-10 MUK6565 EDI → EMA Jul 10, 19:20 UTCJul 10, 20:00 UTC40m
2026-07-10 MUK6566 EMA → EDI Jul 10, 04:45 UTCJul 10, 05:25 UTC40m
2026-07-10 MUK6566 CGN → EMA Jul 10, 01:55 UTCJul 10, 02:50 UTC55m
2026-07-09 MUK6977 EMA → CGN Jul 9, 22:00 UTCJul 9, 23:10 UTC1h 10m
2026-07-09 MUK6977 - Jul 9, 18:55 UTCJul 9, 19:35 UTC40m
2026-07-09 MUK6978 EMA → BFS Jul 9, 03:50 UTCJul 9, 04:30 UTC40m
2026-07-09 MUK6978 CGN → EMA Jul 9, 01:15 UTCJul 9, 02:15 UTC1h 0m
2026-07-08 MUK6565 EMA → CGN Jul 8, 21:50 UTCJul 8, 23:00 UTC1h 10m
2026-07-08 MUK6565 EDI → EMA Jul 8, 19:20 UTCJul 8, 20:10 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-MACY page for operator, model, and routing details .

Mode-S 4004FE frequently asked

What is Mode-S code 4004FE?
4004FE is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-MACY.
Where is Mode-S 4004FE registered?
Mode-S code 4004FE 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 4004FE broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4004FE, octal 20002376, decimal 4,195,582.
What flights does 4004FE operate?
Mode-S 4004FE has broadcast 10 distinct callsigns, including MUK6565, MUK6566, MUK6977, MUK6978, SRR6566.