Apparatus

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sensors Mode-S transponder

45CAB5

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-RUU · AIRBUS A-321

Hex
45CAB5
Octal
21345265
Decimal
4,573,877
Country
DK
Tail
OY-RUU
Type
A321
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
159
Distinct callsigns
20
Country
DK
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 45CAB5.

Country allocation

The ICAO 24-bit address 45CAB5 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
CAT678 - 5 2026-06-26
CAT677 - 5 2026-06-26
CAT334 - 5 2026-06-28
CAT333 - 5 2026-06-28
CAT332 - 5 2026-06-28
CAT331 Copenhagen Airtaxi 4 2026-06-28
VKG1506 - 2 2026-07-02
TRA88B Transavia Holland 2 2026-05-28
TRA7X Transavia Holland 2 2026-05-28
TRA55J Transavia Holland 2 2026-05-25
TRA35L Transavia Holland 2 2026-05-24
TRA31G Transavia Holland 2 2026-05-24
RZO3121 - 2 2026-06-02
RZO178 - 2 2026-07-13
RZO124 SATA International 2 2026-05-15
MAC9902 - 2 2026-07-17
MAC9901 - 2 2026-07-16
MAC128D - 2 2026-07-16
EXS041A - 2 2026-07-06
EXS011P - 2 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GRL930 BYJ → ATH Jul 26, 11:15 UTCJul 26, 21:15 UTC10h 0m
2026-07-25 TVS115F PRG → BLL Jul 25, 14:00 UTCJul 25, 15:10 UTC1h 10m
2026-07-24 TVS2MN LEI → PRG Jul 24, 19:30 UTCJul 24, 22:10 UTC2h 40m
2026-07-24 TVS1MN LEI → PRG Jul 24, 15:30 UTCJul 24, 18:30 UTC3h 0m
2026-07-24 TVS115P PRG → AGP Jul 24, 13:00 UTCJul 24, 14:05 UTC1h 5m
2026-07-22 BLX979P ARN → BLL Jul 22, 16:10 UTCJul 22, 17:10 UTC1h 0m
2026-07-21 BLX134 PMI → GOT Jul 21, 20:25 UTCJul 22, 00:10 UTC3h 45m
2026-07-21 BLX133 ARN → CHQ Jul 21, 15:35 UTCJul 21, 19:10 UTC3h 35m
2026-07-21 BLX158 PMI → ARN Jul 21, 10:20 UTCJul 21, 13:40 UTC3h 20m
2026-07-21 BLX157 ARN → PMI Jul 21, 05:15 UTCJul 21, 08:55 UTC3h 40m
2026-07-20 BLX282 TFS → CPH Jul 20, 12:15 UTCJul 20, 15:20 UTC3h 5m
2026-07-20 BLX281 ARN → CTA Jul 20, 06:45 UTCJul 20, 10:15 UTC3h 30m
2026-07-19 BLX722 PMI → ARN Jul 19, 22:40 UTCJul 20, 01:50 UTC3h 10m
2026-07-19 BLX721 HEL → SID Jul 19, 16:20 UTCJul 19, 20:05 UTC3h 45m
2026-07-18 BLX978P - Jul 18, 20:20 UTCJul 18, 21:20 UTC1h 0m
2026-07-17 MAC9902 - Jul 17, 12:15 UTCJul 17, 15:15 UTC3h 0m
2026-07-16 MAC128D - Jul 16, 18:00 UTCJul 16, 21:10 UTC3h 10m
2026-07-16 MAC9901 CPH → AMS Jul 16, 15:10 UTCJul 16, 16:09 UTC1h 0m
2026-07-15 JTD226 AHO → CPH Jul 15, 19:05 UTCJul 15, 21:20 UTC2h 15m
2026-07-15 JTD225 - Jul 15, 14:35 UTCJul 15, 16:55 UTC2h 20m
2026-07-15 JTD9225 BLL → CPH Jul 15, 11:50 UTCJul 15, 12:20 UTC30m
2026-07-14 RZO9179 - Jul 14, 18:55 UTCJul 14, 22:05 UTC3h 10m
2026-07-13 RZO179 - Jul 13, 22:00 UTCJul 13, 23:00 UTC1h 0m
2026-07-13 RZO178 - Jul 13, 19:35 UTCJul 13, 20:35 UTC1h 0m
2026-07-13 RZO178 - Jul 13, 18:15 UTCJul 13, 18:25 UTC10m
2026-07-13 RZO3185 - Jul 13, 13:10 UTCJul 13, 14:05 UTC55m
2026-07-12 HAT5072 OPO → OPO Jul 12, 13:35 UTCJul 12, 17:50 UTC4h 15m
2026-07-12 HAT071P - Jul 12, 08:20 UTCJul 12, 11:15 UTC2h 55m
2026-07-10 VKG4985 CPH → BLL Jul 10, 14:55 UTCJul 10, 15:25 UTC30m
2026-07-10 VKG1185 - Jul 10, 10:25 UTCJul 10, 13:55 UTC3h 30m
2026-07-10 VKG1184 CPH → KGS Jul 10, 05:30 UTCJul 10, 08:15 UTC2h 45m
2026-07-09 VKG4984 - Jul 9, 15:05 UTCJul 9, 15:30 UTC25m
2026-07-08 TRA082 - Jul 8, 13:00 UTCJul 8, 13:55 UTC55m
2026-07-07 TRA68H LIS → AMS Jul 7, 13:20 UTCJul 7, 15:55 UTC2h 35m
2026-07-07 TRA78L AMS → LIS Jul 7, 09:15 UTCJul 7, 11:50 UTC2h 35m
2026-07-07 TRA081 - Jul 7, 06:45 UTCJul 7, 07:35 UTC50m
2026-07-06 EXS041A MAN → BLL Jul 6, 10:50 UTCJul 6, 12:00 UTC1h 10m
2026-07-05 EXS8PH KRK → MAN Jul 5, 20:30 UTCJul 5, 23:00 UTC2h 30m
2026-07-05 EXS77PR MAN → KRK Jul 5, 17:20 UTCJul 5, 19:25 UTC2h 5m
2026-07-05 EXS45VK FAO → MAN Jul 5, 12:35 UTCJul 5, 15:15 UTC2h 40m
2026-07-05 EXS875 MAN → FAO Jul 5, 08:50 UTCJul 5, 11:15 UTC2h 25m
2026-07-04 EXS874 FAO → MAN Jul 4, 21:55 UTCJul 5, 00:30 UTC2h 35m
2026-07-04 EXS873 MAN → FAO Jul 4, 18:00 UTCJul 4, 20:30 UTC2h 30m
2026-07-04 EXS876 FAO → MAN Jul 4, 10:45 UTCJul 4, 13:20 UTC2h 35m
2026-07-04 EXS987 MAN → FAO Jul 4, 06:45 UTCJul 4, 09:20 UTC2h 35m
2026-07-03 EXS5FT FAO → MAN Jul 3, 21:05 UTCJul 3, 23:50 UTC2h 45m
2026-07-03 EXS1YR MAN → FAO Jul 3, 17:25 UTCJul 3, 19:55 UTC2h 30m
2026-07-03 EXS041A - Jul 3, 08:35 UTCJul 3, 12:35 UTC4h 0m
2026-07-02 VKG1506 - Jul 2, 12:50 UTCJul 2, 14:30 UTC1h 40m
2026-07-02 VKG1506 BGO → FAO Jul 2, 07:50 UTCJul 2, 11:35 UTC3h 45m

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

Mode-S 45CAB5 frequently asked

What is Mode-S code 45CAB5?
45CAB5 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-RUU.
Where is Mode-S 45CAB5 registered?
Mode-S code 45CAB5 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45CAB5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45CAB5, octal 21345265, decimal 4,573,877.
What flights does 45CAB5 operate?
Mode-S 45CAB5 has broadcast 20 distinct callsigns, including CAT678, CAT677, CAT334, CAT333, CAT332.