Apparatus

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sensors Mode-S transponder

45CF24

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SYD · BOEING 767-300

Hex
45CF24
Octal
21347444
Decimal
4,575,012
Country
DK
Tail
OY-SYD
Type
B763
Broadcasting now · callsign SRR6401 · 34,025 ft
Flights observed
254
Distinct callsigns
16
Country
DK
Last broadcast
Jul 24, 22:00 UTC

Current position

45CF24 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 45CF24 falls within the block assigned to Denmark (DK) by ICAO Annex 10, Volume III. Every aircraft registered in Denmark 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 16 distinct

Callsign Airline Flights Last seen
SRR6402 Star Air 100 2026-07-21
SRR6401 Star Air 97 2026-07-20
SRR6498 Star Air 22 2026-07-24
SRR6497 Star Air 13 2026-07-24
SRR6374 - 4 2026-06-25
SRR6373 - 4 2026-06-25
UPS292 United Parcel Service 2 2026-05-27
UPS291 United Parcel Service 2 2026-05-27
SRR6316 - 2 2026-06-19
SRR6315 - 2 2026-06-19
UPS275 - 1 2026-07-17
UPS274 United Parcel Service 1 2026-07-17
SRR9231 - 1 2026-07-23
ITY9481 - 1 2026-06-23
ITY9480 - 1 2026-06-23
ITY9470 - 1 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 SRR6497 BLQ → CGN Jul 24, 20:50 UTCJul 24, 22:00 UTC1h 10m
2026-07-24 SRR6498 CGN → BLQ Jul 24, 04:05 UTCJul 24, 04:30 UTC25m
2026-07-24 SRR6498 CGN → BLQ Jul 24, 02:00 UTCJul 24, 02:55 UTC55m
2026-07-23 SRR9231 - Jul 23, 18:40 UTCJul 23, 20:05 UTC1h 25m
2026-07-21 SRR6402 CGN → AOI Jul 21, 04:10 UTCJul 21, 05:05 UTC55m
2026-07-21 SRR6402 CGN → AOI Jul 21, 00:45 UTCJul 21, 01:45 UTC1h 0m
2026-07-20 SRR6401 AOI → CGN Jul 20, 21:20 UTCJul 20, 22:15 UTC55m
2026-07-20 SRR6401 AOI → CGN Jul 20, 18:35 UTCJul 20, 19:15 UTC40m
2026-07-20 SRR6402 CGN → AOI Jul 20, 03:25 UTCJul 20, 04:05 UTC40m
2026-07-19 SRR6402 CGN → AOI Jul 19, 22:55 UTCJul 19, 23:55 UTC1h 0m
2026-07-17 UPS275 - Jul 17, 21:15 UTCJul 17, 22:49 UTC1h 35m
2026-07-17 UPS274 CGN → BUD Jul 17, 02:45 UTCJul 17, 03:45 UTC1h 0m
2026-07-16 SRR6401 - Jul 16, 21:00 UTCJul 16, 22:30 UTC1h 30m
2026-07-16 SRR6402 - Jul 16, 04:45 UTCJul 16, 05:20 UTC35m
2026-07-16 SRR6402 CGN → BGY Jul 16, 00:40 UTCJul 16, 01:40 UTC1h 0m
2026-07-15 SRR6401 - Jul 15, 21:25 UTCJul 15, 22:40 UTC1h 15m
2026-07-15 SRR6401 - Jul 15, 18:45 UTCJul 15, 19:35 UTC50m
2026-07-15 SRR6402 - Jul 15, 04:30 UTCJul 15, 05:10 UTC40m
2026-07-15 SRR6402 CGN → BGY Jul 15, 01:00 UTCJul 15, 02:00 UTC1h 0m
2026-07-14 SRR6401 - Jul 14, 21:00 UTCJul 14, 22:00 UTC1h 0m
2026-07-14 SRR6401 - Jul 14, 18:35 UTCJul 14, 19:15 UTC40m
2026-07-14 SRR6402 - Jul 14, 04:50 UTCJul 14, 05:20 UTC30m
2026-07-14 SRR6402 - Jul 14, 00:45 UTCJul 14, 01:40 UTC55m
2026-07-13 SRR6401 - Jul 13, 21:20 UTCJul 13, 22:35 UTC1h 15m
2026-07-13 SRR6401 - Jul 13, 18:25 UTCJul 13, 19:05 UTC40m
2026-07-13 SRR6402 - Jul 13, 03:20 UTCJul 13, 04:00 UTC40m
2026-07-12 SRR6402 - Jul 12, 22:50 UTCJul 12, 23:45 UTC55m
2026-07-10 SRR6401 - Jul 10, 21:05 UTCJul 10, 22:10 UTC1h 5m
2026-07-10 SRR6401 - Jul 10, 18:30 UTCJul 10, 19:05 UTC35m
2026-07-10 SRR6402 - Jul 10, 04:45 UTCJul 10, 05:20 UTC35m
2026-07-10 SRR6402 - Jul 10, 00:55 UTCJul 10, 01:55 UTC1h 0m
2026-07-09 SRR6497 BLQ → CGN Jul 9, 20:10 UTCJul 9, 21:20 UTC1h 10m
2026-07-09 SRR6498 - Jul 9, 04:20 UTCJul 9, 04:45 UTC25m
2026-07-09 SRR6498 - Jul 9, 02:10 UTCJul 9, 03:05 UTC55m
2026-07-08 SRR6401 - Jul 8, 22:15 UTCJul 8, 23:20 UTC1h 5m
2026-07-08 SRR6401 - Jul 8, 19:50 UTCJul 8, 20:25 UTC35m
2026-07-08 SRR6402 - Jul 8, 04:35 UTCJul 8, 05:10 UTC35m
2026-07-08 SRR6402 CGN → BGY Jul 8, 01:10 UTCJul 8, 02:05 UTC55m
2026-07-06 SRR6401 - Jul 6, 22:10 UTCJul 6, 23:15 UTC1h 5m
2026-07-06 SRR6401 - Jul 6, 18:25 UTCJul 6, 19:15 UTC50m
2026-07-06 SRR6402 - Jul 6, 03:25 UTCJul 6, 03:55 UTC30m
2026-07-05 SRR6402 - Jul 5, 23:00 UTCJul 5, 23:55 UTC55m
2026-07-03 SRR6401 - Jul 3, 21:00 UTCJul 3, 22:15 UTC1h 15m
2026-07-03 SRR6401 - Jul 3, 18:20 UTCJul 3, 18:55 UTC35m
2026-07-03 SRR6402 - Jul 3, 04:30 UTCJul 3, 05:05 UTC35m
2026-07-03 SRR6402 - Jul 3, 00:55 UTCJul 3, 01:55 UTC1h 0m
2026-07-02 SRR6401 - Jul 2, 21:10 UTCJul 2, 22:10 UTC1h 0m
2026-07-02 SRR6401 - Jul 2, 18:25 UTCJul 2, 19:00 UTC35m
2026-07-02 SRR6402 - Jul 2, 04:55 UTCJul 2, 05:35 UTC40m
2026-07-02 SRR6402 - Jul 2, 01:00 UTCJul 2, 01:55 UTC55m

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 OY-SYD page for operator, model, and routing details .

Mode-S 45CF24 frequently asked

What is Mode-S code 45CF24?
45CF24 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SYD.
Where is Mode-S 45CF24 registered?
Mode-S code 45CF24 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CF24 broadcasting right now?
Yes. Mode-S 45CF24 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CF24, octal 21347444, decimal 4,575,012.
What flights does 45CF24 operate?
Mode-S 45CF24 has broadcast 16 distinct callsigns, including SRR6402, SRR6401, SRR6498, SRR6497, SRR6374.