Apparatus

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sensors Mode-S transponder

45AB4B

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-JZK · BOEING 737-800

Hex
45AB4B
Octal
21325513
Decimal
4,565,835
Country
DK
Tail
OY-JZK
Type
B738
Broadcasting now · callsign SAS581 · 37,000 ft
Flights observed
306
Distinct callsigns
20
Country
DK
Last broadcast
Jul 26, 22:45 UTC

Current position

45AB4B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 45AB4B 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
JTD557 - 10 2026-06-26
JTD558 Jet Time 9 2026-06-19
JTD526 Jet Time 7 2026-06-20
JTD562 Jet Time 6 2026-06-19
JTD561 Jet Time 6 2026-06-19
JTD544 Jet Time 6 2026-06-21
JTD543 Jet Time 6 2026-06-21
JTD540 - 6 2026-06-14
JTD525 Jet Time 6 2026-06-20
JTD53T - 5 2026-06-14
JTD9784 - 4 2026-06-18
JTD784 - 4 2026-06-18
JTD783 - 4 2026-06-18
JTD712 Jet Time 4 2026-06-17
JTD711 - 4 2026-06-17
JTD614 - 4 2026-06-16
JTD613 - 4 2026-06-16
JTD560 - 4 2026-06-22
JTD9984 - 3 2026-04-16
JTD983 - 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JTD34Q - Jul 26, 19:55 UTCJul 26, 22:45 UTC2h 50m
2026-07-26 JTD303 CPH → CHQ Jul 26, 15:30 UTCJul 26, 18:30 UTC3h 0m
2026-07-25 JTD254 RHO → CPH Jul 25, 18:25 UTCJul 25, 21:55 UTC3h 30m
2026-07-25 JTD253 CPH → RHO Jul 25, 13:50 UTCJul 25, 16:50 UTC3h 0m
2026-07-25 JTD390 PMI → CPH Jul 25, 09:50 UTCJul 25, 12:25 UTC2h 35m
2026-07-25 JTD389 CPH → PMI Jul 25, 05:25 UTCJul 25, 08:15 UTC2h 50m
2026-07-24 JTD378 KGS → CPH Jul 24, 20:30 UTCJul 24, 23:50 UTC3h 20m
2026-07-24 JTD377 CPH → KGS Jul 24, 15:50 UTCJul 24, 18:40 UTC2h 50m
2026-07-24 JTD376 LCA → CPH Jul 24, 10:20 UTCJul 24, 14:15 UTC3h 55m
2026-07-24 JTD375 CPH → LCA Jul 24, 05:15 UTCJul 24, 08:35 UTC3h 20m
2026-07-23 JTD386 SPU → CPH Jul 23, 19:50 UTCJul 23, 22:55 UTC3h 5m
2026-07-23 JTD385 - Jul 23, 15:40 UTCJul 23, 18:25 UTC2h 45m
2026-07-23 JTD384 - Jul 23, 10:15 UTCJul 23, 13:25 UTC3h 10m
2026-07-23 JTD383 - Jul 23, 06:05 UTCJul 23, 08:55 UTC2h 50m
2026-07-20 JTD244 PVK → CPH Jul 20, 18:15 UTCJul 20, 20:50 UTC2h 35m
2026-07-20 JTD623 - Jul 20, 13:55 UTCJul 20, 16:50 UTC2h 55m
2026-07-20 JTD624 - Jul 20, 09:40 UTCJul 20, 12:20 UTC2h 40m
2026-07-20 JTD243 - Jul 20, 05:35 UTCJul 20, 07:50 UTC2h 15m
2026-07-19 JTD204 RHO → CPH Jul 19, 19:55 UTCJul 19, 23:10 UTC3h 15m
2026-07-19 JTD441 - Jul 19, 15:10 UTCJul 19, 18:30 UTC3h 20m
2026-07-19 JTD442 - Jul 19, 09:40 UTCJul 19, 13:10 UTC3h 30m
2026-07-19 JTD203 CPH → RHO Jul 19, 05:00 UTCJul 19, 08:20 UTC3h 20m
2026-07-18 SAS33D PMI → CPH Jul 18, 17:20 UTCJul 18, 19:50 UTC2h 30m
2026-07-18 SAS69P CPH → CDG Jul 18, 12:55 UTCJul 18, 15:40 UTC2h 45m
2026-07-18 SAS800 NCE → CPH Jul 18, 08:40 UTCJul 18, 10:35 UTC1h 55m
2026-07-18 SAS799 CPH → NCE Jul 18, 05:25 UTCJul 18, 07:30 UTC2h 5m
2026-07-17 JTD378 KGS → CPH Jul 17, 20:00 UTCJul 17, 23:10 UTC3h 10m
2026-07-17 JTD377 CPH → KGS Jul 17, 15:40 UTCJul 17, 18:40 UTC3h 0m
2026-07-17 JTD376 LCA → CPH Jul 17, 10:10 UTCJul 17, 14:04 UTC3h 55m
2026-07-17 JTD375 CPH → LCA Jul 17, 05:10 UTCJul 17, 08:40 UTC3h 30m
2026-07-16 JTD392 - Jul 16, 11:20 UTCJul 16, 14:40 UTC3h 20m
2026-07-16 JTD391 - Jul 16, 06:50 UTCJul 16, 09:45 UTC2h 55m
2026-07-15 JTD372 - Jul 15, 09:40 UTCJul 15, 12:15 UTC2h 35m
2026-07-15 JTD371 - Jul 15, 05:45 UTCJul 15, 08:10 UTC2h 25m
2026-07-14 JTD328 - Jul 14, 11:05 UTCJul 14, 13:45 UTC2h 40m
2026-07-14 JTD327 - Jul 14, 06:45 UTCJul 14, 09:30 UTC2h 45m
2026-07-13 JTD244 - Jul 13, 19:50 UTCJul 13, 22:30 UTC2h 40m
2026-07-13 JTD623 - Jul 13, 15:25 UTCJul 13, 18:00 UTC2h 35m
2026-07-13 JTD624 - Jul 13, 11:25 UTCJul 13, 14:05 UTC2h 40m
2026-07-13 JTD243 CPH → PVK Jul 13, 07:45 UTCJul 13, 10:10 UTC2h 25m
2026-07-12 JTD204 RHO → CPH Jul 12, 20:01 UTCJul 12, 23:30 UTC3h 30m
2026-07-12 JTD441 - Jul 12, 15:25 UTCJul 12, 18:50 UTC3h 25m
2026-07-12 JTD442 RHO → AAL Jul 12, 09:40 UTCJul 12, 13:15 UTC3h 35m
2026-07-12 JTD203 CPH → RHO Jul 12, 05:20 UTCJul 12, 08:30 UTC3h 10m
2026-07-11 JTD390 - Jul 11, 10:35 UTCJul 11, 13:20 UTC2h 45m
2026-07-11 JTD389 - Jul 11, 05:45 UTCJul 11, 08:55 UTC3h 10m
2026-07-10 SAS51B BCN → CPH Jul 10, 17:55 UTCJul 10, 20:45 UTC2h 50m
2026-07-10 SAS65D CPH → BCN Jul 10, 13:35 UTCJul 10, 16:15 UTC2h 40m
2026-07-10 SAS2834 DBV → CPH Jul 10, 10:00 UTCJul 10, 12:10 UTC2h 10m
2026-07-10 SAS2833 CPH → DBV Jul 10, 07:00 UTCJul 10, 08:55 UTC1h 55m

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

Mode-S 45AB4B frequently asked

What is Mode-S code 45AB4B?
45AB4B is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-JZK.
Where is Mode-S 45AB4B registered?
Mode-S code 45AB4B is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45AB4B broadcasting right now?
Yes. Mode-S 45AB4B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45AB4B, octal 21325513, decimal 4,565,835.
What flights does 45AB4B operate?
Mode-S 45AB4B has broadcast 20 distinct callsigns, including JTD557, JTD558, JTD526, JTD562, JTD561.