Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

45AB28

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-JYH · BOEING 737-800

Hex
45AB28
Octal
21325450
Decimal
4,565,800
Country
DK
Tail
OY-JYH
Type
B738
No current signal · last broadcast 2h ago
Flights observed
213
Distinct callsigns
20
Country
DK
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 45AB28.

Country allocation

The ICAO 24-bit address 45AB28 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 Air Greenland 11 2026-06-12
JTD759 - 6 2026-07-07
JTD743 - 5 2026-07-13
JTD603 - 5 2026-07-13
JTD760 - 4 2026-07-07
JTD744 - 4 2026-07-13
JTD692 - 4 2026-07-11
JTD691 - 4 2026-07-11
JTD664 - 4 2026-07-12
JTD663 - 4 2026-07-12
JTD662 - 4 2026-07-12
JTD661 - 4 2026-07-12
JTD660 - 4 2026-07-10
JTD635 - 4 2026-07-08
JTD604 - 4 2026-07-13
JTD680 - 3 2026-07-10
JTD679 - 3 2026-07-10
JTD659 - 3 2026-07-10
JTD640 - 3 2026-07-09
JTD639 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 JTD744 - Jul 13, 21:20 UTCJul 14, 00:15 UTC2h 55m
2026-07-13 JTD743 - Jul 13, 17:10 UTCJul 13, 20:00 UTC2h 50m
2026-07-13 JTD604 - Jul 13, 13:15 UTCJul 13, 16:00 UTC2h 45m
2026-07-13 JTD603 - Jul 13, 09:00 UTCJul 13, 12:00 UTC3h 0m
2026-07-12 JTD664 - Jul 12, 18:55 UTCJul 12, 22:10 UTC3h 15m
2026-07-12 JTD663 - Jul 12, 14:45 UTCJul 12, 17:45 UTC3h 0m
2026-07-12 JTD662 RHO → ARN Jul 12, 08:45 UTCJul 12, 12:15 UTC3h 30m
2026-07-12 JTD661 - Jul 12, 06:35 UTCJul 12, 07:10 UTC35m
2026-07-12 JTD661 - Jul 12, 03:30 UTCJul 12, 06:30 UTC3h 0m
2026-07-11 JTD692 CHQ → ARN Jul 11, 10:10 UTCJul 11, 13:35 UTC3h 25m
2026-07-11 JTD691 ARN → CHQ Jul 11, 05:05 UTCJul 11, 08:40 UTC3h 35m
2026-07-10 JTD660 - Jul 10, 20:25 UTCJul 11, 00:00 UTC3h 35m
2026-07-10 JTD679 - Jul 10, 16:10 UTCJul 10, 19:15 UTC3h 5m
2026-07-10 JTD680 - Jul 10, 08:20 UTCJul 10, 10:30 UTC2h 10m
2026-07-10 JTD659 - Jul 10, 03:55 UTCJul 10, 07:10 UTC3h 15m
2026-07-09 JTD640 - Jul 9, 13:10 UTCJul 9, 16:50 UTC3h 40m
2026-07-09 JTD639A - Jul 9, 09:05 UTCJul 9, 11:35 UTC2h 30m
2026-07-09 JTD639 ARN → CPH Jul 9, 06:25 UTCJul 9, 07:30 UTC1h 5m
2026-07-08 JTD636 RHO → ARN Jul 8, 11:50 UTCJul 8, 15:35 UTC3h 45m
2026-07-08 JTD635 ARN → RHO Jul 8, 06:25 UTCJul 8, 09:55 UTC3h 30m
2026-07-08 JTD635 ARN → ARN Jul 8, 06:05 UTCJul 8, 06:10 UTC5m
2026-07-07 JTD760 - Jul 7, 20:30 UTCJul 7, 21:30 UTC1h 0m
2026-07-07 JTD760 - Jul 7, 14:50 UTCJul 7, 19:25 UTC4h 35m
2026-07-07 JTD759 - Jul 7, 08:35 UTCJul 7, 13:15 UTC4h 40m
2026-07-07 JTD759 ARN → CPH Jul 7, 06:30 UTCJul 7, 07:25 UTC55m
2026-07-06 JTD744 - Jul 6, 19:30 UTCJul 6, 22:40 UTC3h 10m
2026-07-06 JTD743 MMX → PVK Jul 6, 15:00 UTCJul 6, 17:35 UTC2h 35m
2026-07-06 JTD604 - Jul 6, 09:50 UTCJul 6, 13:10 UTC3h 20m
2026-07-06 JTD603 - Jul 6, 05:30 UTCJul 6, 08:05 UTC2h 35m
2026-07-05 JTD664 - Jul 5, 18:45 UTCJul 5, 22:05 UTC3h 20m
2026-07-05 JTD663 - Jul 5, 14:35 UTCJul 5, 17:30 UTC2h 55m
2026-07-05 JTD662 RHO → ARN Jul 5, 08:40 UTCJul 5, 12:55 UTC4h 15m
2026-07-05 JTD661 ARN → RHO Jul 5, 03:35 UTCJul 5, 07:00 UTC3h 25m
2026-07-04 JTD692 - Jul 4, 11:05 UTCJul 4, 14:40 UTC3h 35m
2026-07-04 JTD691 - Jul 4, 05:55 UTCJul 4, 09:10 UTC3h 15m
2026-07-03 JTD660 - Jul 3, 21:05 UTCJul 4, 00:45 UTC3h 40m
2026-07-03 JTD679 - Jul 3, 16:20 UTCJul 3, 19:35 UTC3h 15m
2026-07-03 JTD680 - Jul 3, 08:10 UTCJul 3, 11:35 UTC3h 25m
2026-07-03 JTD659 - Jul 3, 03:20 UTCJul 3, 07:00 UTC3h 40m
2026-07-02 JTD640 - Jul 2, 11:40 UTCJul 2, 15:05 UTC3h 25m
2026-07-02 JTD639 - Jul 2, 06:30 UTCJul 2, 09:55 UTC3h 25m
2026-07-01 JTD636 RHO → ARN Jul 1, 11:20 UTCJul 1, 14:50 UTC3h 30m
2026-07-01 JTD635 ARN → RHO Jul 1, 06:25 UTCJul 1, 10:05 UTC3h 40m
2026-06-30 JTD760 - Jun 30, 14:45 UTCJun 30, 19:55 UTC5h 10m
2026-06-30 JTD759 - Jun 30, 08:40 UTCJun 30, 13:30 UTC4h 50m
2026-06-30 JTD759 ARN → CPH Jun 30, 06:30 UTCJun 30, 07:35 UTC1h 5m
2026-06-29 JTD743 MMX → PVK Jun 29, 15:19 UTCJun 29, 22:44 UTC7h 25m
2026-06-29 JTD603 ARN → ARN Jun 29, 05:54 UTCJun 29, 13:24 UTC7h 30m
2026-06-28 JTD664 - Jun 28, 18:55 UTCJun 28, 21:59 UTC3h 5m
2026-06-28 JTD663 - Jun 28, 14:45 UTCJun 28, 17:39 UTC2h 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-JYH page for operator, model, and routing details .

Mode-S 45AB28 frequently asked

What is Mode-S code 45AB28?
45AB28 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-JYH.
Where is Mode-S 45AB28 registered?
Mode-S code 45AB28 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45AB28 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45AB28, octal 21325450, decimal 4,565,800.
What flights does 45AB28 operate?
Mode-S 45AB28 has broadcast 20 distinct callsigns, including GRL774, JTD759, JTD743, JTD603, JTD760.