Apparatus

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sensors Mode-S transponder

45CE4F

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SRO · BOEING 767-200

Hex
45CE4F
Octal
21347117
Decimal
4,574,799
Country
DK
Tail
OY-SRO
Type
B762
No current signal · last broadcast 9h ago
Flights observed
136
Distinct callsigns
14
Country
DK
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S 45CE4F.

Country allocation

The ICAO 24-bit address 45CE4F 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
SRR6382 - 33 2026-07-12
SRR6381 - 33 2026-07-13
SRR6228 Star Air 15 2026-05-13
SRR6227 Star Air 15 2026-05-13
SRR6646 Star Air 13 2026-06-04
SRR6645 Star Air 13 2026-06-04
SRR6498 - 4 2026-06-24
UPS292 United Parcel Service 2 2026-04-16
UPS291 United Parcel Service 2 2026-04-16
SRR6497 - 2 2026-06-24
UPS260 United Parcel Service 1 2026-05-07
UPS259 United Parcel Service 1 2026-05-07
SRR7402 - 1 2026-06-05
SRR6401 Star Air 1 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SRR6381 - Jul 13, 20:50 UTCJul 13, 22:05 UTC1h 15m
2026-07-12 SRR6382 CGN → MRS Jul 12, 23:30 UTCJul 13, 00:40 UTC1h 10m
2026-07-10 SRR6381 - Jul 10, 20:25 UTCJul 10, 21:40 UTC1h 15m
2026-07-10 SRR6382 CGN → MRS Jul 10, 02:00 UTCJul 10, 03:15 UTC1h 15m
2026-07-08 SRR6381 - Jul 8, 20:25 UTCJul 8, 21:40 UTC1h 15m
2026-07-08 SRR6382 CGN → MRS Jul 8, 02:05 UTCJul 8, 03:15 UTC1h 10m
2026-07-07 SRR6381 - Jul 7, 20:25 UTCJul 7, 21:50 UTC1h 25m
2026-07-07 SRR6382 CGN → MRS Jul 7, 01:55 UTCJul 7, 03:05 UTC1h 10m
2026-07-06 SRR6381 MRS → CGN Jul 6, 20:25 UTCJul 6, 21:50 UTC1h 25m
2026-07-05 SRR6382 - Jul 5, 23:40 UTCJul 6, 00:50 UTC1h 10m
2026-07-03 SRR6381 - Jul 3, 20:30 UTCJul 3, 21:50 UTC1h 20m
2026-07-03 SRR6382 CGN → MRS Jul 3, 02:05 UTCJul 3, 03:15 UTC1h 10m
2026-07-01 SRR6381 - Jul 1, 20:30 UTCJul 1, 21:55 UTC1h 25m
2026-07-01 SRR6382 - Jul 1, 02:00 UTCJul 1, 03:15 UTC1h 15m
2026-06-30 SRR6381 - Jun 30, 21:30 UTCJun 30, 22:55 UTC1h 25m
2026-06-30 SRR6382 - Jun 30, 01:55 UTCJun 30, 03:10 UTC1h 15m
2026-06-29 SRR6381 - Jun 29, 20:35 UTCJun 29, 22:05 UTC1h 30m
2026-06-29 SRR6382 CGN → MRS Jun 29, 00:20 UTCJun 29, 01:44 UTC1h 25m
2026-06-26 SRR6381 - Jun 26, 20:24 UTCJun 26, 21:45 UTC1h 20m
2026-06-26 SRR6382 - Jun 26, 02:00 UTCJun 26, 03:15 UTC1h 15m
2026-06-25 SRR6381 - Jun 25, 20:49 UTCJun 25, 22:04 UTC1h 15m
2026-06-25 SRR6382 CGN → MRS Jun 25, 02:05 UTCJun 25, 03:15 UTC1h 10m
2026-06-24 SRR6497 - Jun 24, 20:05 UTCJun 24, 21:14 UTC1h 10m
2026-06-24 SRR6498 - Jun 24, 04:15 UTCJun 24, 04:50 UTC35m
2026-06-24 SRR6498 CGN → BGY Jun 24, 02:05 UTCJun 24, 03:04 UTC1h 0m
2026-06-23 SRR6381 - Jun 23, 20:34 UTCJun 23, 21:59 UTC1h 25m
2026-06-23 SRR6382 CGN → MRS Jun 23, 01:59 UTCJun 23, 03:15 UTC1h 15m
2026-06-22 SRR6381 - Jun 22, 20:30 UTCJun 22, 21:54 UTC1h 25m
2026-06-21 SRR6382 CGN → MRS Jun 21, 23:34 UTCJun 22, 00:40 UTC1h 5m
2026-06-19 SRR6497 - Jun 19, 22:04 UTCJun 19, 23:19 UTC1h 15m
2026-06-19 SRR6498 BGY → BLQ Jun 19, 04:19 UTCJun 19, 04:50 UTC30m
2026-06-19 SRR6498 CGN → BGY Jun 19, 02:04 UTCJun 19, 03:15 UTC1h 10m
2026-06-18 SRR6381 - Jun 18, 20:50 UTCJun 18, 22:10 UTC1h 20m
2026-06-18 SRR6382 - Jun 18, 01:50 UTCJun 18, 03:00 UTC1h 10m
2026-06-17 SRR6381 - Jun 17, 20:20 UTCJun 17, 21:45 UTC1h 25m
2026-06-17 SRR6382 - Jun 17, 01:55 UTCJun 17, 03:05 UTC1h 10m
2026-06-16 SRR6381 MRS → CGN Jun 16, 20:25 UTCJun 16, 21:50 UTC1h 25m
2026-06-16 SRR6382 CGN → MRS Jun 16, 02:09 UTCJun 16, 03:20 UTC1h 10m
2026-06-15 SRR6381 MRS → CGN Jun 15, 20:20 UTCJun 15, 21:40 UTC1h 20m
2026-06-14 SRR6382 CGN → MRS Jun 14, 23:29 UTCJun 15, 00:45 UTC1h 15m
2026-06-12 SRR6381 MRS → CGN Jun 12, 20:20 UTCJun 12, 21:40 UTC1h 20m
2026-06-12 SRR6382 - Jun 12, 02:15 UTCJun 12, 03:35 UTC1h 20m
2026-06-11 SRR6381 MRS → CGN Jun 11, 20:25 UTCJun 11, 21:45 UTC1h 20m
2026-06-11 SRR6382 CGN → BOD Jun 11, 02:00 UTCJun 11, 03:15 UTC1h 15m
2026-06-11 SRR6382 CGN → BOD Jun 11, 01:45 UTCJun 11, 01:50 UTC5m
2026-06-10 SRR6381 MRS → CGN Jun 10, 21:10 UTCJun 10, 21:40 UTC30m
2026-06-10 SRR6381 MRS → CGN Jun 10, 20:20 UTCJun 10, 21:05 UTC45m
2026-06-10 SRR6382 CGN → BOD Jun 10, 02:00 UTCJun 10, 03:15 UTC1h 15m
2026-06-09 SRR6381 MRS → CGN Jun 9, 20:25 UTCJun 9, 21:55 UTC1h 30m
2026-06-09 SRR6382 CGN → BOD Jun 9, 01:55 UTCJun 9, 03:15 UTC1h 20m

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

Mode-S 45CE4F frequently asked

What is Mode-S code 45CE4F?
45CE4F is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SRO.
Where is Mode-S 45CE4F registered?
Mode-S code 45CE4F is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CE4F broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CE4F, octal 21347117, decimal 4,574,799.
What flights does 45CE4F operate?
Mode-S 45CE4F has broadcast 14 distinct callsigns, including SRR6382, SRR6381, SRR6228, SRR6227, SRR6646.