Apparatus

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sensors Mode-S transponder

45AB53

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-JZS · BOEING 737-800

Hex
45AB53
Octal
21325523
Decimal
4,565,843
Country
DK
Tail
OY-JZS
Type
B738
No current signal · last broadcast 16h ago
Flights observed
268
Distinct callsigns
20
Country
DK
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 45AB53.

Country allocation

The ICAO 24-bit address 45AB53 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
GRL774 - 11 2026-07-12
JTD342 - 6 2026-06-08
SAS30T - 4 2026-06-20
SAS1717 Scandinavian Airlines System 4 2026-05-26
SAS1716 Scandinavian Airlines System 4 2026-05-26
JTD611 - 4 2026-06-08
JTD514 - 4 2026-07-09
JTD513 - 4 2026-07-09
JTD410 - 4 2026-07-09
JTD409 - 4 2026-07-09
JTD245 - 4 2026-07-12
GRL777 - 4 2026-07-12
SAS96C - 3 2026-06-20
SAS790 Scandinavian Airlines System 3 2026-05-23
SAS789 Scandinavian Airlines System 3 2026-05-23
SAS684 Scandinavian Airlines System 3 2026-05-23
SAS683 Scandinavian Airlines System 3 2026-05-23
SAS55L Scandinavian Airlines System 3 2026-05-23
SAS51B - 3 2026-06-26
SAS42K - 3 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GRL775 - Jul 13, 15:30 UTCJul 13, 18:30 UTC3h 0m
2026-07-12 GRL774 - Jul 12, 18:50 UTCJul 13, 13:45 UTC18h 55m
2026-07-12 GRL774 - Jul 12, 16:50 UTCJul 13, 13:45 UTC20h 55m
2026-07-12 GRL777 CPH → CPH Jul 12, 16:05 UTCJul 13, 13:45 UTC21h 40m
2026-07-12 JTD246 RHO → CPH Jul 12, 10:10 UTCJul 12, 13:25 UTC3h 15m
2026-07-12 JTD245 CPH → RHO Jul 12, 05:45 UTCJul 12, 08:50 UTC3h 5m
2026-07-11 JTD248 - Jul 11, 20:45 UTCJul 11, 23:50 UTC3h 5m
2026-07-11 JTD537 - Jul 11, 16:15 UTCJul 11, 19:25 UTC3h 10m
2026-07-11 JTD520 RHO → BLL Jul 11, 10:20 UTCJul 11, 13:50 UTC3h 30m
2026-07-11 JTD519 - Jul 11, 05:20 UTCJul 11, 08:50 UTC3h 30m
2026-07-10 JTD562 - Jul 10, 21:35 UTCJul 11, 00:55 UTC3h 20m
2026-07-10 JTD561 - Jul 10, 17:30 UTCJul 10, 20:25 UTC2h 55m
2026-07-10 JTD532 - Jul 10, 05:40 UTCJul 10, 15:45 UTC10h 5m
2026-07-09 JTD514 - Jul 9, 20:35 UTCJul 10, 00:25 UTC3h 50m
2026-07-09 JTD409 - Jul 9, 16:25 UTCJul 9, 19:15 UTC2h 50m
2026-07-09 JTD410 - Jul 9, 10:10 UTCJul 9, 13:55 UTC3h 45m
2026-07-09 JTD513 - Jul 9, 05:10 UTCJul 9, 08:05 UTC2h 55m
2026-07-08 GRL765 - Jul 8, 06:30 UTCJul 8, 17:05 UTC10h 35m
2026-07-08 JTD9368 CPH → BLL Jul 8, 04:50 UTCJul 8, 05:15 UTC25m
2026-07-07 GRL761 - Jul 7, 08:20 UTCJul 7, 18:40 UTC10h 20m
2026-07-06 JTD9528 - Jul 6, 22:30 UTCJul 6, 22:55 UTC25m
2026-07-06 JTD528 - Jul 6, 18:30 UTCJul 6, 21:40 UTC3h 10m
2026-07-06 JTD227 - Jul 6, 14:35 UTCJul 6, 17:10 UTC2h 35m
2026-07-06 JTD228 - Jul 6, 10:20 UTCJul 6, 13:20 UTC3h 0m
2026-07-06 JTD527 BLL → ZTH Jul 6, 05:35 UTCJul 6, 08:20 UTC2h 45m
2026-07-05 JTD530 - Jul 5, 10:05 UTCJul 5, 12:45 UTC2h 40m
2026-07-05 JTD529 - Jul 5, 05:45 UTCJul 5, 08:20 UTC2h 35m
2026-07-04 JTD508 - Jul 4, 20:40 UTCJul 4, 23:20 UTC2h 40m
2026-07-04 JTD507 - Jul 4, 15:50 UTCJul 4, 18:15 UTC2h 25m
2026-07-04 JTD520 RHO → BLL Jul 4, 11:00 UTCJul 4, 14:40 UTC3h 40m
2026-07-04 JTD519 BLL → RHO Jul 4, 05:20 UTCJul 4, 08:35 UTC3h 15m
2026-07-03 JTD562 CHQ → BLL Jul 3, 19:35 UTCJul 3, 23:05 UTC3h 30m
2026-07-03 JTD561 - Jul 3, 15:20 UTCJul 3, 18:15 UTC2h 55m
2026-07-03 JTD558 - Jul 3, 09:55 UTCJul 3, 13:20 UTC3h 25m
2026-07-03 JTD557 - Jul 3, 05:20 UTCJul 3, 08:30 UTC3h 10m
2026-07-02 JTD514 - Jul 2, 20:30 UTCJul 2, 23:45 UTC3h 15m
2026-07-02 JTD409 - Jul 2, 16:10 UTCJul 2, 19:25 UTC3h 15m
2026-07-02 JTD410 - Jul 2, 10:05 UTCJul 2, 13:35 UTC3h 30m
2026-07-02 JTD513 - Jul 2, 05:35 UTCJul 2, 08:45 UTC3h 10m
2026-07-01 GRL766 - Jul 1, 06:35 UTCJul 1, 16:50 UTC10h 15m
2026-06-29 JTD560 - Jun 29, 21:39 UTCJun 30, 01:25 UTC3h 45m
2026-06-29 JTD311 - Jun 29, 16:19 UTCJun 29, 20:04 UTC3h 45m
2026-06-28 GRL774 - Jun 28, 19:09 UTCJun 29, 14:14 UTC19h 5m
2026-06-28 GRL774 - Jun 28, 16:55 UTCJun 29, 14:14 UTC21h 20m
2026-06-28 JTD268 - Jun 28, 12:05 UTCJun 28, 14:59 UTC2h 55m
2026-06-28 JTD267 - Jun 28, 07:50 UTCJun 28, 10:44 UTC2h 55m
2026-06-27 JTD254 RHO → CPH Jun 27, 18:29 UTCJun 27, 21:44 UTC3h 15m
2026-06-27 JTD253 CPH → RHO Jun 27, 14:05 UTCJun 27, 17:14 UTC3h 10m
2026-06-27 JTD390 PMI → CPH Jun 27, 09:34 UTCJun 27, 12:15 UTC2h 40m
2026-06-27 JTD389 - Jun 27, 05:29 UTCJun 27, 08:14 UTC2h 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-JZS page for operator, model, and routing details .

Mode-S 45AB53 frequently asked

What is Mode-S code 45AB53?
45AB53 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-JZS.
Where is Mode-S 45AB53 registered?
Mode-S code 45AB53 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45AB53 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45AB53, octal 21325523, decimal 4,565,843.
What flights does 45AB53 operate?
Mode-S 45AB53 has broadcast 20 distinct callsigns, including GRL774, JTD342, SAS30T, SAS1717, SAS1716.