Apparatus

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sensors Mode-S transponder

45AB23

ICAO 24-bit transponder address · allocated to Denmark

Currently assigned to OY-JYC · BOEING 737-800

Hex
45AB23
Octal
21325443
Decimal
4,565,795
Country
DK
Tail
OY-JYC
Type
B738
No current signal · last broadcast 8h ago
Flights observed
371
Distinct callsigns
20
Country
DK
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 45AB23.

Country allocation

The ICAO 24-bit address 45AB23 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
FIN8AM - 30 2026-07-14
FIN33V - 28 2026-07-14
FIN8U - 23 2026-07-11
FIN1HA - 23 2026-07-11
FIN5H - 12 2026-06-23
FIN9AP - 11 2026-07-02
FIN65M Finnair 11 2026-06-23
FIN4EA - 11 2026-07-13
FIN30T - 11 2026-07-13
FIN9ML - 10 2026-06-22
FIN4KG - 10 2026-07-02
FIN1AB - 10 2026-06-22
FIN8KT - 8 2026-07-08
FIN7X - 8 2026-07-08
FIN6HL - 7 2026-07-04
FIN5DM - 7 2026-07-04
FIN7LK - 6 2026-07-13
FIN6PR - 6 2026-06-21
FIN6D - 6 2026-07-12
FIN60A - 6 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FIN33V KEF → HEL Jul 14, 09:40 UTCJul 14, 12:40 UTC3h 0m
2026-07-14 FIN8AM HEL → KEF Jul 14, 04:35 UTCJul 14, 07:55 UTC3h 20m
2026-07-13 FIN7LK - Jul 13, 17:45 UTCJul 13, 20:25 UTC2h 40m
2026-07-13 FIN60A - Jul 13, 14:00 UTCJul 13, 16:40 UTC2h 40m
2026-07-13 FIN30T DUB → HEL Jul 13, 09:20 UTCJul 13, 12:15 UTC2h 55m
2026-07-13 FIN4EA - Jul 13, 05:20 UTCJul 13, 07:55 UTC2h 35m
2026-07-12 FIN6D - Jul 12, 17:40 UTCJul 12, 19:30 UTC1h 50m
2026-07-12 FIN1163 HEL → KRK Jul 12, 15:10 UTCJul 12, 16:45 UTC1h 35m
2026-07-12 FIN6G KRK → HEL Jul 12, 11:15 UTCJul 12, 13:01 UTC1h 45m
2026-07-12 FIN1EG - Jul 12, 07:50 UTCJul 12, 09:30 UTC1h 40m
2026-07-11 FIN8U BUD → HEL Jul 11, 16:55 UTCJul 11, 19:00 UTC2h 5m
2026-07-11 FIN1HA HEL → BUD Jul 11, 13:55 UTCJul 11, 15:55 UTC2h 0m
2026-07-11 FIN60H - Jul 11, 10:50 UTCJul 11, 12:15 UTC1h 25m
2026-07-11 FIN1PM HEL → CPH Jul 11, 08:15 UTCJul 11, 09:30 UTC1h 15m
2026-07-10 FIN9YA - Jul 10, 16:25 UTCJul 10, 18:00 UTC1h 35m
2026-07-10 FIN79T HEL → BER Jul 10, 13:45 UTCJul 10, 15:15 UTC1h 30m
2026-07-10 FIN1YB PRG → HEL Jul 10, 09:50 UTCJul 10, 11:50 UTC2h 0m
2026-07-10 FIN1TH HEL → PRG Jul 10, 06:55 UTCJul 10, 08:35 UTC1h 40m
2026-07-09 FIN4BV - Jul 9, 17:55 UTCJul 9, 20:25 UTC2h 30m
2026-07-09 FIN3EF - Jul 9, 14:15 UTCJul 9, 16:45 UTC2h 30m
2026-07-09 FIN33V - Jul 9, 09:30 UTCJul 9, 12:35 UTC3h 5m
2026-07-09 FIN8AM HEL → KEF Jul 9, 04:50 UTCJul 9, 08:10 UTC3h 20m
2026-07-08 FIN7X NCE → HEL Jul 8, 17:40 UTCJul 8, 20:50 UTC3h 10m
2026-07-08 FIN8KT HEL → NCE Jul 8, 13:20 UTCJul 8, 16:15 UTC2h 55m
2026-07-08 FIN4LK MXP → HEL Jul 8, 08:45 UTCJul 8, 11:35 UTC2h 50m
2026-07-08 FIN6Y HEL → MXP Jul 8, 04:55 UTCJul 8, 07:30 UTC2h 35m
2026-07-07 FIN4BV CDG → HEL Jul 7, 17:45 UTCJul 7, 20:20 UTC2h 35m
2026-07-07 FIN3EF - Jul 7, 13:35 UTCJul 7, 16:05 UTC2h 30m
2026-07-07 FIN1772 - Jul 7, 08:00 UTCJul 7, 10:35 UTC2h 35m
2026-07-07 FIN4AF HEL → BLQ Jul 7, 04:15 UTCJul 7, 06:50 UTC2h 35m
2026-07-06 FIN7LK - Jul 6, 17:35 UTCJul 6, 20:25 UTC2h 50m
2026-07-06 FIN60A HEL → BLQ Jul 6, 13:55 UTCJul 6, 16:35 UTC2h 40m
2026-07-06 FIN60H - Jul 6, 11:20 UTCJul 6, 12:35 UTC1h 15m
2026-07-06 FIN1PM HEL → CPH Jul 6, 08:30 UTCJul 6, 09:45 UTC1h 15m
2026-07-06 FIN7RX - Jul 6, 06:05 UTCJul 6, 07:20 UTC1h 15m
2026-07-06 FIN8RK HEL → CPH Jul 6, 03:35 UTCJul 6, 04:50 UTC1h 15m
2026-07-05 FIN8U BUD → HEL Jul 5, 16:50 UTCJul 5, 18:55 UTC2h 5m
2026-07-05 FIN1HA HEL → BUD Jul 5, 13:55 UTCJul 5, 15:55 UTC2h 0m
2026-07-05 FIN33V KEF → HEL Jul 5, 09:20 UTCJul 5, 12:25 UTC3h 5m
2026-07-05 FIN8AM HEL → KEF Jul 5, 04:40 UTCJul 5, 07:55 UTC3h 15m
2026-07-04 FIN6HL BUD → HEL Jul 4, 13:05 UTCJul 4, 15:05 UTC2h 0m
2026-07-04 FIN5DM HEL → BUD Jul 4, 10:05 UTCJul 4, 12:05 UTC2h 0m
2026-07-04 FIN4KB ARN → HEL Jul 4, 05:35 UTCJul 4, 06:15 UTC40m
2026-07-04 FIN1NX HEL → ARN Jul 4, 03:55 UTCJul 4, 04:35 UTC40m
2026-07-03 FIN7X NCE → HEL Jul 3, 17:40 UTCJul 3, 20:35 UTC2h 55m
2026-07-03 FIN8KT HEL → NCE Jul 3, 13:25 UTCJul 3, 16:25 UTC3h 0m
2026-07-03 FIN1YB PRG → HEL Jul 3, 09:55 UTCJul 3, 11:45 UTC1h 50m
2026-07-03 FIN1TH HEL → PRG Jul 3, 06:55 UTCJul 3, 08:50 UTC1h 55m
2026-07-02 FIN4KG - Jul 2, 19:05 UTCJul 2, 21:25 UTC2h 20m
2026-07-02 FIN9AP - Jul 2, 14:45 UTCJul 2, 17:20 UTC2h 35m

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

Mode-S 45AB23 frequently asked

What is Mode-S code 45AB23?
45AB23 is an ICAO 24-bit transponder address. Allocated to Denmark. Assigned to OY-JYC.
Where is Mode-S 45AB23 registered?
Mode-S code 45AB23 is allocated to Denmark (DK). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 45AB23 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 45AB23, octal 21325443, decimal 4,565,795.
What flights does 45AB23 operate?
Mode-S 45AB23 has broadcast 20 distinct callsigns, including FIN8AM, FIN33V, FIN8U, FIN1HA, FIN5H.