Apparatus

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sensors Mode-S transponder

45CE55

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SRU · BOEING 767-300

Hex
45CE55
Octal
21347125
Decimal
4,574,805
Country
DK
Tail
OY-SRU
Type
B763
No current signal · last broadcast Jul 24, 22:15 UTC
Flights observed
290
Distinct callsigns
12
Country
DK
Last broadcast
Jul 24, 22:15 UTC

Last known position

Most recent position reported by Mode-S 45CE55.

Country allocation

The ICAO 24-bit address 45CE55 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 12 distinct

Callsign Airline Flights Last seen
SRR6119 Star Air 121 2026-07-24
SRR6118 Star Air 120 2026-07-24
SRR6315 - 12 2026-07-02
SRR6316 - 11 2026-07-02
SRR6374 - 8 2026-07-03
SRR6373 - 8 2026-07-03
UPS275 United Parcel Service 2 2026-05-14
UPS274 United Parcel Service 2 2026-05-14
SRR6402 Star Air 2 2026-05-15
SRR6401 Star Air 2 2026-05-15
SRR9291 - 1 2026-04-29
SRR9032 - 1 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 SRR6119 ATH → CGN Jul 24, 21:20 UTCJul 24, 22:10 UTC50m
2026-07-24 SRR6119 ATH → CGN Jul 24, 17:55 UTCJul 24, 20:15 UTC2h 20m
2026-07-24 SRR6118 CGN → ATH Jul 24, 04:40 UTCJul 24, 06:30 UTC1h 50m
2026-07-24 SRR6118 CGN → ATH Jul 24, 02:30 UTCJul 24, 03:15 UTC45m
2026-07-23 SRR6119 ATH → CGN Jul 23, 21:20 UTCJul 23, 22:10 UTC50m
2026-07-23 SRR6119 ATH → CGN Jul 23, 17:40 UTCJul 23, 19:55 UTC2h 15m
2026-07-23 SRR6118 CGN → ATH Jul 23, 04:10 UTCJul 23, 06:10 UTC2h 0m
2026-07-23 SRR6118 CGN → ATH Jul 23, 02:30 UTCJul 23, 03:10 UTC40m
2026-07-22 SRR6119 ATH → CGN Jul 22, 21:10 UTCJul 22, 22:00 UTC50m
2026-07-22 SRR6119 ATH → CGN Jul 22, 17:45 UTCJul 22, 19:55 UTC2h 10m
2026-07-22 SRR6118 CGN → ATH Jul 22, 04:35 UTCJul 22, 05:25 UTC50m
2026-07-22 SRR6118 CGN → ATH Jul 22, 02:25 UTCJul 22, 03:15 UTC50m
2026-07-21 SRR6119 MUC → CGN Jul 21, 21:10 UTCJul 21, 21:55 UTC45m
2026-07-21 SRR6119 ATH → MUC Jul 21, 17:40 UTCJul 21, 19:50 UTC2h 10m
2026-07-21 SRR6118 CGN → ATH Jul 21, 04:25 UTCJul 21, 06:25 UTC2h 0m
2026-07-21 SRR6118 CGN → ATH Jul 21, 02:25 UTCJul 21, 03:15 UTC50m
2026-07-20 SRR6119 MUC → CGN Jul 20, 21:10 UTCJul 20, 21:50 UTC40m
2026-07-20 SRR6119 ATH → MUC Jul 20, 17:40 UTCJul 20, 19:55 UTC2h 15m
2026-07-20 SRR6118 CGN → ATH Jul 20, 04:40 UTCJul 20, 06:45 UTC2h 5m
2026-07-20 SRR6118 CGN → ATH Jul 20, 02:25 UTCJul 20, 03:10 UTC45m
2026-07-17 SRR6119 MUC → CGN Jul 17, 21:15 UTCJul 17, 22:15 UTC1h 0m
2026-07-17 SRR6119 ATH → MUC Jul 17, 17:55 UTCJul 17, 20:04 UTC2h 10m
2026-07-17 SRR6118 CGN → ATH Jul 17, 04:25 UTCJul 17, 06:25 UTC2h 0m
2026-07-17 SRR6118 CGN → ATH Jul 17, 02:30 UTCJul 17, 03:14 UTC45m
2026-07-16 SRR6119 MUC → CGN Jul 16, 21:55 UTCJul 16, 22:49 UTC55m
2026-07-16 SRR6119 ATH → MUC Jul 16, 18:00 UTCJul 16, 20:15 UTC2h 15m
2026-07-16 SRR6118 MUC → ATH Jul 16, 04:35 UTCJul 16, 06:40 UTC2h 5m
2026-07-16 SRR6118 CGN → MUC Jul 16, 02:25 UTCJul 16, 03:10 UTC45m
2026-07-15 SRR6119 MUC → CGN Jul 15, 21:30 UTCJul 15, 22:25 UTC55m
2026-07-15 SRR6119 ATH → MUC Jul 15, 17:55 UTCJul 15, 20:10 UTC2h 15m
2026-07-15 SRR6118 MUC → ATH Jul 15, 04:40 UTCJul 15, 06:35 UTC1h 55m
2026-07-15 SRR6118 CGN → MUC Jul 15, 02:25 UTCJul 15, 03:10 UTC45m
2026-07-14 SRR6119 MUC → CGN Jul 14, 21:35 UTCJul 14, 22:30 UTC55m
2026-07-14 SRR6119 ATH → MUC Jul 14, 17:55 UTCJul 14, 20:15 UTC2h 20m
2026-07-14 SRR6118 MUC → ATH Jul 14, 04:35 UTCJul 14, 06:40 UTC2h 5m
2026-07-14 SRR6118 CGN → MUC Jul 14, 02:25 UTCJul 14, 03:10 UTC45m
2026-07-13 SRR6119 MUC → CGN Jul 13, 21:30 UTCJul 13, 22:30 UTC1h 0m
2026-07-13 SRR6119 ATH → MUC Jul 13, 17:50 UTCJul 13, 20:00 UTC2h 10m
2026-07-13 SRR6118 MUC → ATH Jul 13, 04:25 UTCJul 13, 06:25 UTC2h 0m
2026-07-13 SRR6118 CGN → MUC Jul 13, 02:20 UTCJul 13, 03:05 UTC45m
2026-07-10 SRR6119 MUC → CGN Jul 10, 21:10 UTCJul 10, 21:55 UTC45m
2026-07-10 SRR6119 ATH → MUC Jul 10, 17:45 UTCJul 10, 19:55 UTC2h 10m
2026-07-10 SRR6118 MUC → ATH Jul 10, 04:40 UTCJul 10, 06:35 UTC1h 55m
2026-07-10 SRR6118 CGN → MUC Jul 10, 02:40 UTCJul 10, 03:25 UTC45m
2026-07-09 SRR6119 MUC → CGN Jul 9, 21:40 UTCJul 9, 22:30 UTC50m
2026-07-09 SRR6119 ATH → MUC Jul 9, 17:50 UTCJul 9, 20:15 UTC2h 25m
2026-07-09 SRR6118 MUC → ATH Jul 9, 04:25 UTCJul 9, 06:20 UTC1h 55m
2026-07-09 SRR6118 CGN → MUC Jul 9, 02:30 UTCJul 9, 03:15 UTC45m
2026-07-08 SRR6119 MUC → CGN Jul 8, 21:35 UTCJul 8, 22:35 UTC1h 0m
2026-07-08 SRR6119 ATH → MUC Jul 8, 18:00 UTCJul 8, 20:25 UTC2h 25m

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

Mode-S 45CE55 frequently asked

What is Mode-S code 45CE55?
45CE55 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SRU.
Where is Mode-S 45CE55 registered?
Mode-S code 45CE55 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CE55 broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CE55, octal 21347125, decimal 4,574,805.
What flights does 45CE55 operate?
Mode-S 45CE55 has broadcast 12 distinct callsigns, including SRR6119, SRR6118, SRR6315, SRR6316, SRR6374.