Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

45CE4E

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-SRN · BOEING 767-200

Hex
45CE4E
Octal
21347116
Decimal
4,574,798
Country
DK
Tail
OY-SRN
Type
B762
No current signal · last broadcast 19d ago
Flights observed
129
Distinct callsigns
17
Country
DK
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S 45CE4E.

Country allocation

The ICAO 24-bit address 45CE4E 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 17 distinct

Callsign Airline Flights Last seen
SRR6228 - 29 2026-06-22
SRR6227 - 29 2026-06-22
SRR6645 - 24 2026-06-26
SRR6646 - 23 2026-06-26
SRR6498 Star Air 4 2026-04-24
UPS292 - 2 2026-06-24
UPS275 United Parcel Service 2 2026-04-22
UPS274 United Parcel Service 2 2026-04-22
UPS249 United Parcel Service 2 2026-04-27
UPS248 United Parcel Service 2 2026-04-27
SRR6497 Star Air 2 2026-04-24
SRR6119 Star Air 2 2026-04-20
SRR6118 Star Air 2 2026-04-20
UPS267 United Parcel Service 1 2026-05-15
UPS266 United Parcel Service 1 2026-05-15
SRR9281 - 1 2026-06-28
SRR6291 - 1 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-28 SRR9281 CGN → GBA Jun 28, 14:19 UTCJun 28, 15:20 UTC1h 0m
2026-06-26 SRR6645 - Jun 26, 20:44 UTCJun 26, 22:44 UTC2h 0m
2026-06-26 SRR6645 LIS → OPO Jun 26, 18:39 UTCJun 26, 19:14 UTC35m
2026-06-26 SRR6646 - Jun 26, 05:44 UTCJun 26, 06:15 UTC30m
2026-06-26 SRR6646 CGN → OPO Jun 26, 02:09 UTCJun 26, 04:24 UTC2h 15m
2026-06-25 SRR6291 HEL → CGN Jun 25, 15:10 UTCJun 25, 17:14 UTC2h 5m
2026-06-24 UPS292 - Jun 24, 04:05 UTCJun 24, 05:15 UTC1h 10m
2026-06-24 UPS292 CGN → MMX Jun 24, 02:00 UTCJun 24, 03:00 UTC1h 0m
2026-06-23 SRR6645 OPO → CGN Jun 23, 20:24 UTCJun 23, 22:40 UTC2h 15m
2026-06-23 SRR6645 LIS → OPO Jun 23, 18:55 UTCJun 23, 19:29 UTC35m
2026-06-23 SRR6646 OPO → LIS Jun 23, 05:39 UTCJun 23, 06:19 UTC40m
2026-06-23 SRR6646 CGN → OPO Jun 23, 02:04 UTCJun 23, 04:14 UTC2h 10m
2026-06-22 SRR6227 BER → CGN Jun 22, 21:14 UTCJun 22, 22:10 UTC55m
2026-06-22 SRR6228 CGN → BER Jun 22, 02:45 UTCJun 22, 03:35 UTC50m
2026-06-19 SRR6645 OPO → CGN Jun 19, 20:24 UTCJun 19, 22:45 UTC2h 20m
2026-06-19 SRR6645 LIS → OPO Jun 19, 18:49 UTCJun 19, 19:25 UTC35m
2026-06-19 SRR6646 OPO → LIS Jun 19, 05:49 UTCJun 19, 06:29 UTC40m
2026-06-19 SRR6646 CGN → OPO Jun 19, 02:24 UTCJun 19, 04:34 UTC2h 10m
2026-06-18 SRR6227 BER → CGN Jun 18, 21:15 UTCJun 18, 22:35 UTC1h 20m
2026-06-18 SRR6228 CGN → BER Jun 18, 02:40 UTCJun 18, 03:35 UTC55m
2026-06-17 SRR6227 - Jun 17, 21:15 UTCJun 17, 22:10 UTC55m
2026-06-17 SRR6228 CGN → BER Jun 17, 02:45 UTCJun 17, 03:35 UTC50m
2026-06-16 SRR6227 BER → CGN Jun 16, 21:10 UTCJun 16, 22:10 UTC1h 0m
2026-06-16 SRR6228 CGN → BER Jun 16, 02:40 UTCJun 16, 03:39 UTC1h 0m
2026-06-15 SRR6227 BER → CGN Jun 15, 21:25 UTCJun 15, 22:20 UTC55m
2026-06-15 SRR6228 CGN → BER Jun 15, 02:44 UTCJun 15, 03:35 UTC50m
2026-06-12 SRR6227 BER → CGN Jun 12, 21:20 UTCJun 12, 22:15 UTC55m
2026-06-12 SRR6228 CGN → BER Jun 12, 02:50 UTCJun 12, 03:40 UTC50m
2026-06-11 SRR6227 BER → CGN Jun 11, 21:30 UTCJun 11, 22:25 UTC55m
2026-06-11 SRR6228 CGN → BER Jun 11, 02:35 UTCJun 11, 03:35 UTC1h 0m
2026-06-10 SRR6227 BER → CGN Jun 10, 21:20 UTCJun 10, 22:15 UTC55m
2026-06-10 SRR6228 CGN → BER Jun 10, 02:50 UTCJun 10, 03:35 UTC45m
2026-06-09 SRR6227 BER → CGN Jun 9, 21:10 UTCJun 9, 22:05 UTC55m
2026-06-09 SRR6228 CGN → BER Jun 9, 02:45 UTCJun 9, 03:35 UTC50m
2026-06-08 SRR6227 BER → CGN Jun 8, 21:20 UTCJun 8, 22:30 UTC1h 10m
2026-06-08 SRR6227 BER → CGN Jun 8, 21:05 UTCJun 8, 21:10 UTC5m
2026-06-08 SRR6228 CGN → BER Jun 8, 02:40 UTCJun 8, 03:35 UTC55m
2026-06-05 SRR6227 BER → CGN Jun 5, 21:15 UTCJun 5, 22:15 UTC1h 0m
2026-06-05 SRR6228 CGN → BER Jun 5, 02:45 UTCJun 5, 03:35 UTC50m
2026-06-04 SRR6227 BER → CGN Jun 4, 21:20 UTCJun 4, 22:15 UTC55m
2026-06-04 SRR6228 CGN → BER Jun 4, 02:50 UTCJun 4, 03:35 UTC45m
2026-06-03 SRR6227 BER → CGN Jun 3, 21:15 UTCJun 3, 22:10 UTC55m
2026-06-03 SRR6228 CGN → BER Jun 3, 02:55 UTCJun 3, 03:40 UTC45m
2026-06-02 SRR6227 BER → CGN Jun 2, 21:15 UTCJun 2, 22:10 UTC55m
2026-06-02 SRR6228 CGN → BER Jun 2, 02:50 UTCJun 2, 03:35 UTC45m
2026-06-01 SRR6227 BER → CGN Jun 1, 21:20 UTCJun 1, 22:20 UTC1h 0m
2026-06-01 SRR6228 CGN → BER Jun 1, 02:50 UTCJun 1, 03:35 UTC45m
2026-05-29 SRR6227 BER → CGN May 29, 21:15 UTCMay 29, 22:05 UTC50m
2026-05-29 SRR6228 CGN → BER May 29, 02:45 UTCMay 29, 03:35 UTC50m
2026-05-28 SRR6227 BER → CGN May 28, 21:10 UTCMay 28, 22:05 UTC55m

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

Mode-S 45CE4E frequently asked

What is Mode-S code 45CE4E?
45CE4E is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-SRN.
Where is Mode-S 45CE4E registered?
Mode-S code 45CE4E is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CE4E broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CE4E, octal 21347116, decimal 4,574,798.
What flights does 45CE4E operate?
Mode-S 45CE4E has broadcast 17 distinct callsigns, including SRR6228, SRR6227, SRR6645, SRR6646, SRR6498.