Apparatus

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sensors Mode-S transponder

45CE4B

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SRK · BOEING 767-200

Hex
45CE4B
Octal
21347113
Decimal
4,574,795
Country
DK
Tail
OY-SRK
Type
B762
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
95
Distinct callsigns
14
Country
DK
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 45CE4B.

Country allocation

The ICAO 24-bit address 45CE4B 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 14 distinct

Callsign Airline Flights Last seen
SRR2BL - 33 2026-05-07
SRR1BL - 30 2026-05-08
SRR6228 Star Air 7 2026-07-24
SRR6227 Star Air 7 2026-07-24
SRR6498 Star Air 4 2026-07-23
SRR6646 - 2 2026-07-15
SRR6645 - 2 2026-07-15
SRR6497 Star Air 2 2026-07-23
SRR6382 Star Air 2 2026-07-21
SRR6381 - 2 2026-07-21
SRR9101 Star Air 1 2026-05-10
SRR9071 Star Air 1 2026-07-05
SRR7992 Star Air 1 2026-07-26
SRR760 Star Air 1 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SRR7992 LEJ → VCE Jul 26, 22:25 UTCJul 26, 22:45 UTC20m
2026-07-26 SRR760 LEJ → CGN Jul 26, 19:20 UTCJul 26, 20:05 UTC45m
2026-07-24 SRR6227 BER → CGN Jul 24, 21:15 UTCJul 24, 22:10 UTC55m
2026-07-24 SRR6228 CGN → BER Jul 24, 02:40 UTCJul 24, 03:35 UTC55m
2026-07-23 SRR6497 BLQ → CGN Jul 23, 20:05 UTCJul 23, 21:20 UTC1h 15m
2026-07-23 SRR6498 CGN → BLQ Jul 23, 04:15 UTCJul 23, 04:45 UTC30m
2026-07-23 SRR6498 CGN → BLQ Jul 23, 02:05 UTCJul 23, 03:05 UTC1h 0m
2026-07-22 SRR6497 BLQ → CGN Jul 22, 20:10 UTCJul 22, 21:30 UTC1h 20m
2026-07-22 SRR6498 CGN → BLQ Jul 22, 04:20 UTCJul 22, 04:50 UTC30m
2026-07-22 SRR6498 CGN → BLQ Jul 22, 02:15 UTCJul 22, 03:10 UTC55m
2026-07-21 SRR6381 - Jul 21, 20:30 UTCJul 21, 21:50 UTC1h 20m
2026-07-21 SRR6382 CGN → BOD Jul 21, 02:00 UTCJul 21, 03:15 UTC1h 15m
2026-07-16 SRR6381 - Jul 16, 23:25 UTCJul 17, 00:35 UTC1h 10m
2026-07-16 SRR6382 CGN → MRS Jul 16, 02:15 UTCJul 16, 03:25 UTC1h 10m
2026-07-15 SRR6645 OPO → CGN Jul 15, 20:15 UTCJul 15, 22:35 UTC2h 20m
2026-07-15 SRR6645 LIS → OPO Jul 15, 18:20 UTCJul 15, 18:50 UTC30m
2026-07-15 SRR6646 OPO → LIS Jul 15, 05:50 UTCJul 15, 06:25 UTC35m
2026-07-15 SRR6646 CGN → OPO Jul 15, 02:10 UTCJul 15, 04:30 UTC2h 20m
2026-07-14 SRR6227 BER → CGN Jul 14, 21:20 UTCJul 14, 22:10 UTC50m
2026-07-14 SRR6228 - Jul 14, 02:50 UTCJul 14, 03:35 UTC45m
2026-07-13 SRR6227 - Jul 13, 21:15 UTCJul 13, 22:15 UTC1h 0m
2026-07-13 SRR6228 - Jul 13, 02:40 UTCJul 13, 03:40 UTC1h 0m
2026-07-10 SRR6227 BER → CGN Jul 10, 21:15 UTCJul 10, 22:20 UTC1h 5m
2026-07-10 SRR6228 CGN → BER Jul 10, 02:50 UTCJul 10, 03:35 UTC45m
2026-07-09 SRR6227 BER → CGN Jul 9, 21:15 UTCJul 9, 22:00 UTC45m
2026-07-09 SRR6228 CGN → BER Jul 9, 02:40 UTCJul 9, 03:35 UTC55m
2026-07-08 SRR6227 BER → CGN Jul 8, 21:15 UTCJul 8, 22:10 UTC55m
2026-07-08 SRR6228 CGN → BER Jul 8, 02:55 UTCJul 8, 03:45 UTC50m
2026-07-07 SRR6227 BER → CGN Jul 7, 21:10 UTCJul 7, 22:05 UTC55m
2026-07-07 SRR6228 CGN → BER Jul 7, 02:50 UTCJul 7, 03:40 UTC50m
2026-07-05 SRR9071 SNN → SNN Jul 5, 12:15 UTCJul 5, 13:45 UTC1h 30m
2026-05-10 SRR9101 SNN → CGN May 10, 15:35 UTCMay 10, 17:20 UTC1h 45m
2026-05-08 SRR1BL CGN → BLL May 8, 03:44 UTCMay 8, 04:39 UTC55m
2026-05-08 SRR1BL - May 8, 01:59 UTCMay 8, 02:44 UTC45m
2026-05-07 SRR2BL HAJ → CDG May 7, 21:40 UTCMay 7, 22:54 UTC1h 14m
2026-05-07 SRR2BL - May 7, 19:10 UTCMay 7, 19:55 UTC45m
2026-05-07 SRR1BL CGN → BLL May 7, 03:45 UTCMay 7, 04:40 UTC55m
2026-05-07 SRR1BL CDG → CGN May 7, 02:00 UTCMay 7, 02:45 UTC45m
2026-05-06 SRR2BL HAJ → CDG May 6, 21:35 UTCMay 6, 22:35 UTC1h 0m
2026-05-06 SRR2BL - May 6, 19:15 UTCMay 6, 19:55 UTC40m
2026-05-06 SRR1BL CGN → BLL May 6, 04:00 UTCMay 6, 04:50 UTC50m
2026-05-06 SRR1BL - May 6, 02:01 UTCMay 6, 02:40 UTC40m
2026-05-05 SRR2BL - May 5, 21:30 UTCMay 5, 22:45 UTC1h 15m
2026-05-05 SRR2BL - May 5, 19:10 UTCMay 5, 19:50 UTC40m
2026-05-05 SRR1BL CGN → BLL May 5, 04:05 UTCMay 5, 05:05 UTC1h 0m
2026-05-05 SRR1BL - May 5, 02:20 UTCMay 5, 03:00 UTC40m
2026-05-04 SRR2BL HAJ → CDG May 4, 22:20 UTCMay 4, 23:25 UTC1h 5m
2026-05-04 SRR2BL - May 4, 19:10 UTCMay 4, 19:50 UTC40m
2026-05-01 SRR1BL CGN → BLL May 1, 03:55 UTCMay 1, 04:50 UTC55m
2026-05-01 SRR1BL - May 1, 02:10 UTCMay 1, 02:55 UTC45m

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

Mode-S 45CE4B frequently asked

What is Mode-S code 45CE4B?
45CE4B is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SRK.
Where is Mode-S 45CE4B registered?
Mode-S code 45CE4B is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CE4B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CE4B, octal 21347113, decimal 4,574,795.
What flights does 45CE4B operate?
Mode-S 45CE4B has broadcast 14 distinct callsigns, including SRR2BL, SRR1BL, SRR6228, SRR6227, SRR6498.