Apparatus

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sensors Mode-S transponder

45CE4D

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SRM · BOEING 767-200

Hex
45CE4D
Octal
21347115
Decimal
4,574,797
Country
DK
Tail
OY-SRM
Type
B762
No current signal · last broadcast 24d ago
Flights observed
141
Distinct callsigns
20
Country
DK
Last broadcast
24d ago

Last known position

Most recent position reported by Mode-S 45CE4D.

Country allocation

The ICAO 24-bit address 45CE4D 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 20 distinct

Callsign Airline Flights Last seen
SRR6646 - 44 2026-06-25
SRR6645 - 44 2026-06-25
SRR6382 - 9 2026-06-19
SRR6381 - 9 2026-06-19
UPS260 United Parcel Service 5 2026-05-08
UPS259 United Parcel Service 4 2026-05-08
SRR6498 - 4 2026-06-26
UPS285 - 2 2026-06-23
UPS284 - 2 2026-06-23
SRR6978 Star Air 2 2026-05-07
SRR6977 Star Air 2 2026-05-07
SRR6497 - 2 2026-06-26
MUK6978 - 2 2026-05-07
MUK6977 - 2 2026-05-07
SRR9271 - 1 2026-06-27
SRR7002 - 1 2026-04-15
SRR7001 - 1 2026-04-15
SRR6566 Star Air 1 2026-05-06
SRR6565 Star Air 1 2026-05-06
SRR259 Star Air 1 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-27 SRR9271 - Jun 27, 06:30 UTCJun 27, 08:05 UTC1h 35m
2026-06-26 SRR6497 - Jun 26, 20:50 UTCJun 26, 22:10 UTC1h 20m
2026-06-26 SRR6498 - Jun 26, 04:20 UTCJun 26, 04:50 UTC30m
2026-06-26 SRR6498 - Jun 26, 02:09 UTCJun 26, 03:10 UTC1h 0m
2026-06-25 SRR6645 OPO → CGN Jun 25, 20:30 UTCJun 25, 22:49 UTC2h 20m
2026-06-25 SRR6645 LIS → OPO Jun 25, 18:24 UTCJun 25, 18:59 UTC35m
2026-06-25 SRR6646 OPO → LIS Jun 25, 05:39 UTCJun 25, 06:14 UTC35m
2026-06-25 SRR6646 CGN → OPO Jun 25, 02:10 UTCJun 25, 04:20 UTC2h 10m
2026-06-24 SRR6645 - Jun 24, 20:14 UTCJun 24, 22:25 UTC2h 10m
2026-06-24 SRR6645 LIS → OPO Jun 24, 18:29 UTCJun 24, 19:00 UTC30m
2026-06-24 SRR6646 OPO → LIS Jun 24, 05:59 UTCJun 24, 06:35 UTC35m
2026-06-24 SRR6646 CGN → OPO Jun 24, 02:09 UTCJun 24, 04:15 UTC2h 5m
2026-06-23 UPS285 - Jun 23, 21:34 UTCJun 23, 22:40 UTC1h 5m
2026-06-23 UPS285 - Jun 23, 18:34 UTCJun 23, 19:19 UTC45m
2026-06-23 UPS284 - Jun 23, 03:39 UTCJun 23, 04:35 UTC55m
2026-06-23 UPS284 - Jun 23, 01:10 UTCJun 23, 02:04 UTC55m
2026-06-22 SRR6645 OPO → CGN Jun 22, 20:19 UTCJun 22, 22:30 UTC2h 10m
2026-06-22 SRR6645 LIS → OPO Jun 22, 18:40 UTCJun 22, 19:09 UTC30m
2026-06-22 SRR6646 OPO → LIS Jun 22, 05:24 UTCJun 22, 06:05 UTC40m
2026-06-22 SRR6646 CGN → OPO Jun 22, 01:05 UTCJun 22, 03:14 UTC2h 10m
2026-06-19 SRR6381 - Jun 19, 20:24 UTCJun 19, 21:39 UTC1h 15m
2026-06-19 SRR6382 - Jun 19, 01:54 UTCJun 19, 03:09 UTC1h 15m
2026-06-18 SRR6645 OPO → CGN Jun 18, 20:10 UTCJun 18, 22:30 UTC2h 20m
2026-06-18 SRR6645 LIS → OPO Jun 18, 18:15 UTCJun 18, 18:45 UTC30m
2026-06-18 SRR6646 OPO → LIS Jun 18, 05:40 UTCJun 18, 06:15 UTC35m
2026-06-18 SRR6646 CGN → OPO Jun 18, 02:05 UTCJun 18, 04:20 UTC2h 15m
2026-06-17 SRR6645 OPO → CGN Jun 17, 20:30 UTCJun 17, 22:40 UTC2h 10m
2026-06-17 SRR6645 LIS → OPO Jun 17, 18:15 UTCJun 17, 18:45 UTC30m
2026-06-17 SRR6646 OPO → LIS Jun 17, 05:40 UTCJun 17, 06:15 UTC35m
2026-06-17 SRR6646 CGN → OPO Jun 17, 02:20 UTCJun 17, 04:30 UTC2h 10m
2026-06-16 SRR6645 OPO → CGN Jun 16, 20:10 UTCJun 16, 22:20 UTC2h 10m
2026-06-16 SRR6645 LIS → OPO Jun 16, 18:20 UTCJun 16, 18:55 UTC35m
2026-06-16 SRR6646 OPO → LIS Jun 16, 05:40 UTCJun 16, 06:15 UTC35m
2026-06-16 SRR6646 CGN → OPO Jun 16, 02:09 UTCJun 16, 04:20 UTC2h 10m
2026-06-15 SRR6645 OPO → CGN Jun 15, 20:04 UTCJun 15, 22:40 UTC2h 35m
2026-06-15 SRR6645 LIS → OPO Jun 15, 18:29 UTCJun 15, 19:00 UTC30m
2026-06-15 SRR6646 OPO → LIS Jun 15, 05:20 UTCJun 15, 06:00 UTC40m
2026-06-15 SRR6646 CGN → OPO Jun 15, 01:00 UTCJun 15, 03:05 UTC2h 5m
2026-06-12 SRR6645 OPO → LIS Jun 12, 20:10 UTCJun 12, 22:20 UTC2h 10m
2026-06-12 SRR6645 OPO → LIS Jun 12, 18:35 UTCJun 12, 19:05 UTC30m
2026-06-12 SRR6646 OPO → LIS Jun 12, 05:40 UTCJun 12, 06:15 UTC35m
2026-06-12 SRR6646 CGN → OPO Jun 12, 02:15 UTCJun 12, 04:30 UTC2h 15m
2026-06-11 SRR6645 OPO → LIS Jun 11, 20:10 UTCJun 11, 22:35 UTC2h 25m
2026-06-11 SRR6645 OPO → LIS Jun 11, 18:35 UTCJun 11, 19:05 UTC30m
2026-06-11 SRR6646 CGN → OPO Jun 11, 05:35 UTCJun 11, 06:10 UTC35m
2026-06-11 SRR6646 CGN → OPO Jun 11, 02:10 UTCJun 11, 04:15 UTC2h 5m
2026-06-10 SRR6645 OPO → LIS Jun 10, 20:10 UTCJun 10, 22:25 UTC2h 15m
2026-06-10 SRR6646 CGN → OPO Jun 10, 02:10 UTCJun 10, 04:35 UTC2h 25m
2026-06-09 SRR6497 BLQ → CGN Jun 9, 20:10 UTCJun 9, 21:20 UTC1h 10m
2026-06-09 SRR6498 CGN → BLQ Jun 9, 04:10 UTCJun 9, 04:35 UTC25m

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

Mode-S 45CE4D frequently asked

What is Mode-S code 45CE4D?
45CE4D is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SRM.
Where is Mode-S 45CE4D registered?
Mode-S code 45CE4D is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CE4D broadcasting right now?
No active broadcast right now. Last signal was 24d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CE4D, octal 21347115, decimal 4,574,797.
What flights does 45CE4D operate?
Mode-S 45CE4D has broadcast 20 distinct callsigns, including SRR6646, SRR6645, SRR6382, SRR6381, UPS260.