Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

45CE56

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SRV · BOEING 767-300

Hex
45CE56
Octal
21347126
Decimal
4,574,806
Country
DK
Tail
OY-SRV
Type
B763
No current signal · last broadcast 10h ago
Flights observed
125
Distinct callsigns
10
Country
DK
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 45CE56.

Country allocation

The ICAO 24-bit address 45CE56 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 10 distinct

Callsign Airline Flights Last seen
SRR6374 Star Air 35 2026-05-28
SRR6373 Star Air 33 2026-05-28
SRR6315 Star Air 22 2026-05-27
SRR6316 Star Air 21 2026-05-27
UPS275 United Parcel Service 4 2026-05-15
UPS274 United Parcel Service 4 2026-05-15
SRR6119 Star Air 2 2026-05-29
SRR6118 Star Air 2 2026-05-29
SRR7001 - 1 2026-05-14
SRR7000 - 1 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 SRR6119 ATH → CGN May 29, 21:50 UTCMay 29, 22:55 UTC1h 5m
2026-05-29 SRR6119 ATH → CGN May 29, 17:50 UTCMay 29, 20:05 UTC2h 15m
2026-05-29 SRR6118 CGN → ATH May 29, 04:30 UTCMay 29, 06:35 UTC2h 5m
2026-05-29 SRR6118 CGN → ATH May 29, 02:25 UTCMay 29, 03:10 UTC45m
2026-05-28 SRR6373 TLS → CGN May 28, 22:05 UTCMay 28, 23:20 UTC1h 15m
2026-05-28 SRR6373 TLS → CGN May 28, 18:30 UTCMay 28, 19:10 UTC40m
2026-05-28 SRR6374 CGN → TLS May 28, 04:05 UTCMay 28, 04:50 UTC45m
2026-05-28 SRR6374 CGN → TLS May 28, 01:50 UTCMay 28, 02:55 UTC1h 5m
2026-05-27 SRR6315 CDG → CGN May 27, 22:00 UTCMay 27, 22:55 UTC55m
2026-05-27 SRR6315 CDG → CGN May 27, 19:35 UTCMay 27, 20:25 UTC50m
2026-05-27 SRR6316 CGN → CDG May 27, 03:45 UTCMay 27, 04:39 UTC55m
2026-05-27 SRR6316 CGN → CDG May 27, 00:34 UTCMay 27, 01:19 UTC45m
2026-05-26 SRR6373 TLS → CGN May 26, 20:45 UTCMay 26, 21:49 UTC1h 5m
2026-05-26 SRR6373 TLS → CGN May 26, 18:45 UTCMay 26, 19:25 UTC40m
2026-05-26 SRR6374 CGN → TLS May 26, 04:04 UTCMay 26, 04:45 UTC40m
2026-05-26 SRR6374 CGN → TLS May 26, 01:55 UTCMay 26, 03:00 UTC1h 5m
2026-05-22 SRR6373 TLS → CGN May 22, 20:40 UTCMay 22, 21:45 UTC1h 5m
2026-05-22 SRR6373 TLS → CGN May 22, 18:35 UTCMay 22, 19:10 UTC35m
2026-05-22 SRR6374 CGN → TLS May 22, 04:05 UTCMay 22, 04:45 UTC40m
2026-05-22 SRR6374 CGN → TLS May 22, 01:55 UTCMay 22, 02:55 UTC1h 0m
2026-05-21 SRR6315 CDG → CGN May 21, 21:45 UTCMay 21, 22:35 UTC50m
2026-05-21 SRR6315 CDG → CGN May 21, 19:30 UTCMay 21, 20:25 UTC55m
2026-05-21 SRR6316 CGN → CDG May 21, 03:45 UTCMay 21, 04:40 UTC55m
2026-05-21 SRR6316 CGN → CDG May 21, 00:35 UTCMay 21, 01:25 UTC50m
2026-05-20 SRR6373 TLS → CGN May 20, 20:15 UTCMay 20, 21:25 UTC1h 10m
2026-05-20 SRR6373 TLS → CGN May 20, 18:25 UTCMay 20, 19:05 UTC40m
2026-05-20 SRR6374 CGN → TLS May 20, 03:55 UTCMay 20, 04:40 UTC46m
2026-05-20 SRR6374 CGN → TLS May 20, 01:50 UTCMay 20, 02:50 UTC1h 0m
2026-05-19 SRR6315 CDG → CGN May 19, 21:50 UTCMay 19, 22:40 UTC50m
2026-05-19 SRR6315 CDG → CGN May 19, 19:40 UTCMay 19, 20:40 UTC1h 0m
2026-05-19 SRR6316 CGN → CDG May 19, 03:40 UTCMay 19, 04:35 UTC55m
2026-05-19 SRR6316 CGN → CDG May 19, 01:10 UTCMay 19, 01:50 UTC40m
2026-05-18 SRR6373 TLS → CGN May 18, 20:25 UTCMay 18, 21:40 UTC1h 15m
2026-05-18 SRR6373 TLS → CGN May 18, 18:30 UTCMay 18, 19:05 UTC35m
2026-05-18 SRR6374 CGN → TLS May 18, 03:35 UTCMay 18, 04:05 UTC30m
2026-05-18 SRR6374 CGN → TLS May 18, 03:20 UTCMay 18, 03:30 UTC10m
2026-05-17 SRR6374 CGN → TLS May 17, 23:40 UTCMay 18, 00:40 UTC1h 0m
2026-05-17 SRR6374 CGN → TLS May 17, 23:25 UTCMay 17, 23:30 UTC5m
2026-05-15 UPS275 VIE → CGN May 15, 20:40 UTCMay 15, 21:55 UTC1h 15m
2026-05-15 UPS274 CGN → BUD May 15, 02:10 UTCMay 15, 03:20 UTC1h 10m
2026-05-14 SRR7001 EMA → CGN May 14, 04:35 UTCMay 14, 05:35 UTC1h 0m
2026-05-14 SRR7000 CGN → EMA May 14, 02:05 UTCMay 14, 03:05 UTC1h 0m
2026-05-13 UPS275 VIE → CGN May 13, 20:50 UTCMay 13, 22:20 UTC1h 30m
2026-05-13 UPS274 CGN → BUD May 13, 02:20 UTCMay 13, 03:20 UTC1h 0m
2026-05-12 UPS275 VIE → CGN May 12, 20:40 UTCMay 12, 22:05 UTC1h 25m
2026-05-12 UPS274 CGN → BUD May 12, 02:45 UTCMay 12, 03:30 UTC45m
2026-05-11 UPS275 VIE → CGN May 11, 21:20 UTCMay 11, 22:35 UTC1h 14m
2026-05-11 UPS274 CGN → BUD May 11, 01:05 UTCMay 11, 02:10 UTC1h 5m
2026-05-07 SRR6315 CDG → CGN May 7, 21:50 UTCMay 7, 22:54 UTC1h 4m
2026-05-07 SRR6315 CDG → CGN May 7, 19:40 UTCMay 7, 20:30 UTC50m

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

Mode-S 45CE56 frequently asked

What is Mode-S code 45CE56?
45CE56 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SRV.
Where is Mode-S 45CE56 registered?
Mode-S code 45CE56 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CE56 broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CE56, octal 21347126, decimal 4,574,806.
What flights does 45CE56 operate?
Mode-S 45CE56 has broadcast 10 distinct callsigns, including SRR6374, SRR6373, SRR6315, SRR6316, UPS275.