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 23d ago
Flights observed
64
Distinct callsigns
3
Country
DK
Last broadcast
23d ago

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 3 distinct

Callsign Airline Flights Last seen
SRR2BL - 33 2026-05-07
SRR1BL - 30 2026-05-08
SRR9101 Star Air 1 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-04-30 SRR2BL HAJ → CDG Apr 30, 21:25 UTCApr 30, 22:35 UTC1h 10m
2026-04-30 SRR2BL - Apr 30, 19:20 UTCApr 30, 20:00 UTC40m
2026-04-30 SRR1BL CGN → BLL Apr 30, 03:50 UTCApr 30, 04:50 UTC1h 0m
2026-04-30 SRR1BL - Apr 30, 02:00 UTCApr 30, 02:50 UTC50m
2026-04-29 SRR2BL HAJ → CDG Apr 29, 21:25 UTCApr 29, 22:35 UTC1h 10m
2026-04-29 SRR2BL - Apr 29, 19:15 UTCApr 29, 19:55 UTC40m
2026-04-29 SRR1BL CGN → BLL Apr 29, 03:45 UTCApr 29, 04:39 UTC55m
2026-04-29 SRR1BL CDG → CGN Apr 29, 02:05 UTCApr 29, 02:45 UTC40m
2026-04-28 SRR2BL HAJ → CDG Apr 28, 21:30 UTCApr 28, 22:40 UTC1h 10m
2026-04-28 SRR2BL - Apr 28, 19:15 UTCApr 28, 19:55 UTC40m
2026-04-28 SRR1BL - Apr 28, 03:35 UTCApr 28, 04:30 UTC55m
2026-04-28 SRR1BL CDG → CGN Apr 28, 02:00 UTCApr 28, 02:40 UTC40m
2026-04-27 SRR2BL HAJ → CDG Apr 27, 21:30 UTCApr 27, 22:40 UTC1h 10m
2026-04-27 SRR2BL - Apr 27, 19:25 UTCApr 27, 20:05 UTC40m
2026-04-24 SRR1BL CGN → BLL Apr 24, 04:00 UTCApr 24, 04:55 UTC55m
2026-04-24 SRR1BL CDG → CGN Apr 24, 02:00 UTCApr 24, 02:45 UTC45m
2026-04-23 SRR2BL HAJ → CDG Apr 23, 21:35 UTCApr 23, 22:45 UTC1h 10m
2026-04-23 SRR2BL - Apr 23, 19:40 UTCApr 23, 20:20 UTC40m
2026-04-23 SRR1BL CGN → BLL Apr 23, 03:55 UTCApr 23, 04:50 UTC55m
2026-04-23 SRR1BL CDG → CGN Apr 23, 02:00 UTCApr 23, 02:40 UTC40m
2026-04-22 SRR2BL HAJ → CDG Apr 22, 21:40 UTCApr 22, 22:45 UTC1h 5m
2026-04-22 SRR2BL BLL → HAJ Apr 22, 19:15 UTCApr 22, 20:00 UTC45m
2026-04-22 SRR1BL CGN → BLL Apr 22, 04:00 UTCApr 22, 05:01 UTC1h 0m
2026-04-22 SRR1BL - Apr 22, 02:15 UTCApr 22, 02:55 UTC40m
2026-04-21 SRR2BL HAJ → CDG Apr 21, 21:45 UTCApr 21, 22:45 UTC1h 0m
2026-04-21 SRR2BL - Apr 21, 19:25 UTCApr 21, 20:05 UTC40m
2026-04-21 SRR1BL CGN → BLL Apr 21, 03:55 UTCApr 21, 04:50 UTC55m
2026-04-21 SRR1BL - Apr 21, 02:05 UTCApr 21, 02:50 UTC45m
2026-04-20 SRR2BL HAJ → CDG Apr 20, 21:45 UTCApr 20, 22:55 UTC1h 10m
2026-04-20 SRR2BL - Apr 20, 19:30 UTCApr 20, 20:10 UTC40m
2026-04-17 SRR1BL CGN → BLL Apr 17, 03:40 UTCApr 17, 04:35 UTC56m

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 23d ago.
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 3 distinct callsigns, including SRR2BL, SRR1BL, SRR9101.