Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign MUK6978 · 12,925 ft
Flights observed
125
Distinct callsigns
10
Country
GB
Last broadcast
2h ago

Current position

4004FE is currently broadcasting. Map zoomed to live position.

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
SRR6566 - 20 2026-06-21
SRR6565 - 19 2026-06-22
MUK6566 - 18 2026-06-22
MUK6565 - 18 2026-06-22
SRR6978 - 13 2026-06-23
MUK6977 - 12 2026-06-18
MUK6978 - 11 2026-06-18
SRR6977 Star Air 10 2026-06-11
UPS207 - 2 2026-06-18
SRR9072 Star Air 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-23 SRR6978 CGN → EMA Jun 23, 00:54 UTCJun 23, 01:59 UTC1h 5m
2026-06-22 SRR6565 EMA → CGN Jun 22, 21:35 UTCJun 22, 22:40 UTC1h 5m
2026-06-22 MUK6565 - Jun 22, 19:24 UTCJun 22, 20:04 UTC40m
2026-06-22 MUK6566 EMA → EDI Jun 22, 03:54 UTCJun 22, 04:30 UTC35m
2026-06-21 SRR6566 CGN → EMA Jun 21, 22:04 UTCJun 21, 23:05 UTC1h 0m
2026-06-19 SRR6565 EMA → CGN Jun 19, 21:34 UTCJun 19, 22:45 UTC1h 10m
2026-06-19 MUK6565 EDI → EMA Jun 19, 19:14 UTCJun 19, 19:59 UTC45m
2026-06-19 MUK6566 EMA → EDI Jun 19, 04:50 UTCJun 19, 05:30 UTC40m
2026-06-19 SRR6566 CGN → EMA Jun 19, 01:45 UTCJun 19, 02:50 UTC1h 5m
2026-06-18 UPS207 - Jun 18, 22:05 UTCJun 18, 23:20 UTC1h 15m
2026-06-18 MUK6977 - Jun 18, 18:45 UTCJun 18, 19:35 UTC50m
2026-06-18 MUK6978 EMA → BFS Jun 18, 03:45 UTCJun 18, 04:25 UTC40m
2026-06-18 SRR6978 - Jun 18, 00:55 UTCJun 18, 01:55 UTC1h 0m
2026-06-17 SRR6565 EMA → CGN Jun 17, 21:35 UTCJun 17, 22:45 UTC1h 10m
2026-06-17 MUK6565 EDI → EMA Jun 17, 19:30 UTCJun 17, 20:15 UTC45m
2026-06-17 MUK6566 - Jun 17, 04:55 UTCJun 17, 05:35 UTC40m
2026-06-17 SRR6566 CGN → EMA Jun 17, 01:50 UTCJun 17, 02:55 UTC1h 5m
2026-06-16 UPS207 - Jun 16, 22:10 UTCJun 16, 23:00 UTC50m
2026-06-16 MUK6977 - Jun 16, 18:55 UTCJun 16, 19:45 UTC50m
2026-06-16 MUK6978 EMA → BFS Jun 16, 03:50 UTCJun 16, 04:30 UTC40m
2026-06-16 SRR6978 CGN → EMA Jun 16, 01:15 UTCJun 16, 02:20 UTC1h 5m
2026-06-15 - EMA → CGN Jun 15, 21:50 UTCJun 15, 23:15 UTC1h 25m
2026-06-15 MUK6565 - Jun 15, 19:20 UTCJun 15, 20:00 UTC40m
2026-06-15 MUK6566 EMA → EDI Jun 15, 03:35 UTCJun 15, 04:15 UTC40m
2026-06-14 SRR6566 CGN → EMA Jun 14, 22:05 UTCJun 14, 23:20 UTC1h 14m
2026-06-12 SRR6565 EDI → CGN Jun 12, 21:30 UTCJun 12, 22:35 UTC1h 5m
2026-06-12 MUK6565 EDI → EMA Jun 12, 19:15 UTCJun 12, 19:55 UTC40m
2026-06-12 MUK6566 EMA → EDI Jun 12, 05:00 UTCJun 12, 05:45 UTC45m
2026-06-12 SRR6566 CGN → EMA Jun 12, 02:10 UTCJun 12, 03:55 UTC1h 45m
2026-06-11 SRR6977 BFS → CGN Jun 11, 22:10 UTCJun 11, 23:20 UTC1h 10m
2026-06-11 MUK6977 - Jun 11, 19:05 UTCJun 11, 19:45 UTC40m
2026-06-11 MUK6978 EMA → BFS Jun 11, 03:45 UTCJun 11, 04:30 UTC45m
2026-06-11 SRR6978 CGN → BFS Jun 11, 01:20 UTCJun 11, 02:20 UTC1h 0m
2026-06-10 SRR6565 EDI → CGN Jun 10, 21:35 UTCJun 10, 22:35 UTC1h 0m
2026-06-10 MUK6565 EDI → EMA Jun 10, 19:25 UTCJun 10, 20:05 UTC40m
2026-06-10 MUK6566 EMA → EDI Jun 10, 04:45 UTCJun 10, 05:25 UTC40m
2026-06-10 SRR6566 CGN → EDI Jun 10, 01:50 UTCJun 10, 02:50 UTC1h 0m
2026-06-09 SRR6977 BFS → CGN Jun 9, 22:15 UTCJun 9, 23:10 UTC55m
2026-06-09 MUK6977 - Jun 9, 19:05 UTCJun 9, 19:55 UTC50m
2026-06-09 MUK6978 EMA → BFS Jun 9, 03:50 UTCJun 9, 04:30 UTC40m
2026-06-09 SRR6978 CGN → BFS Jun 9, 01:10 UTCJun 9, 02:15 UTC1h 5m
2026-06-08 SRR6565 EDI → CGN Jun 8, 21:55 UTCJun 8, 23:05 UTC1h 10m
2026-06-08 MUK6565 EDI → EMA Jun 8, 19:20 UTCJun 8, 20:15 UTC55m
2026-06-08 MUK6566 EMA → EDI Jun 8, 03:35 UTCJun 8, 04:10 UTC35m
2026-06-07 SRR6566 CGN → EDI Jun 7, 22:10 UTCJun 7, 23:15 UTC1h 5m
2026-06-05 SRR6565 EDI → CGN Jun 5, 21:35 UTCJun 5, 22:45 UTC1h 10m
2026-06-05 MUK6565 EDI → EMA Jun 5, 19:15 UTCJun 5, 20:00 UTC45m
2026-06-05 MUK6566 EMA → EDI Jun 5, 04:35 UTCJun 5, 05:20 UTC45m
2026-06-05 SRR6566 CGN → EDI Jun 5, 01:45 UTCJun 5, 02:50 UTC1h 5m
2026-06-04 SRR6977 BFS → CGN Jun 4, 22:00 UTCJun 4, 23:00 UTC1h 0m

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?
Yes. Mode-S 4004FE is currently airborne.
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 SRR6566, SRR6565, MUK6566, MUK6565, SRR6978.