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sensors Mode-S transponder

503D3D

ICAO 24-bit transponder address · allocated to Lithuania

Currently assigned to LY-UNO · BOEING 737-800

Hex
503D3D
Octal
24036475
Decimal
5,258,557
Country
LT
Tail
LY-UNO
Type
B738
No current signal · last broadcast Jul 26, 20:25 UTC
Flights observed
190
Distinct callsigns
19
Country
LT
Last broadcast
Jul 26, 20:25 UTC

Last known position

Most recent position reported by Mode-S 503D3D.

Country allocation

The ICAO 24-bit address 503D3D falls within the block assigned to Lithuania (LT) by ICAO Annex 10, Volume III. Every aircraft registered in Lithuania 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 19 distinct

Callsign Airline Flights Last seen
SZN332 Air Senegal 25 2026-07-26
SZN306 Air Senegal 25 2026-07-24
SZN216 - 22 2026-07-16
SZN331 Air Senegal 21 2026-07-26
SZN305 Air Senegal 19 2026-07-20
SZN210 Air Senegal 16 2026-07-17
SZN1005 - 15 2026-07-04
SZN209 Air Senegal 11 2026-07-26
SZN215 - 10 2026-06-27
SZN405 Air Senegal 9 2026-04-18
SZN406 Air Senegal 6 2026-04-18
SZN207 Air Senegal 3 2026-07-19
SZN321 - 1 2026-06-13
SZN306F - 1 2026-05-17
SZN217 - 1 2026-07-21
SZN105 - 1 2026-04-12
SZ209 - 1 2026-04-26
SNZ332 - 1 2026-06-07
HC215 - 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SZN209 DSS → CKY Jul 26, 16:50 UTCJul 26, 20:25 UTC3h 35m
2026-07-26 SZN332 CMN → DSS Jul 26, 12:15 UTCJul 26, 15:15 UTC3h 0m
2026-07-26 SZN331 DSS → CMN Jul 26, 07:40 UTCJul 26, 07:55 UTC15m
2026-07-24 SZN306 COO → ABJ Jul 24, 08:35 UTCJul 24, 20:25 UTC11h 50m
2026-07-23 SZN332 - Jul 23, 12:10 UTCJul 23, 12:40 UTC30m
2026-07-23 SZN331 DSS → CMN Jul 23, 04:40 UTCJul 23, 05:00 UTC20m
2026-07-22 SZN306 COO → ABJ Jul 22, 18:45 UTCJul 22, 19:25 UTC40m
2026-07-21 SZN217 - Jul 21, 15:45 UTCJul 22, 01:25 UTC9h 40m
2026-07-21 SZN332 - Jul 21, 12:30 UTCJul 21, 13:00 UTC30m
2026-07-21 SZN332 - Jul 21, 09:55 UTCJul 21, 10:05 UTC10m
2026-07-21 SZN331 DSS → CMN Jul 21, 04:25 UTCJul 21, 04:50 UTC25m
2026-07-20 SZN305 ABJ → COO Jul 20, 08:45 UTCJul 20, 19:10 UTC10h 25m
2026-07-19 SZN207 DSS → SID Jul 19, 20:50 UTCJul 20, 01:45 UTC4h 55m
2026-07-19 SZN209 DSS → CKY Jul 19, 15:40 UTCJul 19, 19:20 UTC3h 40m
2026-07-19 SZN332 - Jul 19, 12:20 UTCJul 19, 13:05 UTC45m
2026-07-19 - - Jul 19, 09:50 UTCJul 19, 10:00 UTC10m
2026-07-19 SZN331 - Jul 19, 08:25 UTCJul 19, 08:35 UTC10m
2026-07-19 SZN331 - Jul 19, 05:45 UTCJul 19, 06:00 UTC15m
2026-07-17 SZN210 CKY → DSS Jul 17, 18:15 UTCJul 17, 19:00 UTC45m
2026-07-17 SZN209 - Jul 17, 15:29 UTCJul 17, 16:10 UTC40m
2026-07-17 SZN332 - Jul 17, 11:55 UTCJul 17, 12:19 UTC25m
2026-07-17 SZN331 - Jul 17, 07:14 UTCJul 17, 07:25 UTC10m
2026-07-17 SZN331 - Jul 17, 04:35 UTCJul 17, 04:59 UTC25m
2026-07-16 SZN216 - Jul 16, 15:45 UTCJul 17, 01:05 UTC9h 20m
2026-07-16 SZN332 DSS → DSS Jul 16, 04:30 UTCJul 16, 12:34 UTC8h 5m
2026-07-15 SZN207 DSS → DSS Jul 15, 20:45 UTCJul 16, 01:35 UTC4h 50m
2026-07-15 SZN210 - Jul 15, 15:20 UTCJul 15, 19:10 UTC3h 50m
2026-07-15 SZN332 - Jul 15, 12:15 UTCJul 15, 12:40 UTC25m
2026-07-15 SZN332 - Jul 15, 09:45 UTCJul 15, 09:55 UTC10m
2026-07-15 SZN331 - Jul 15, 04:35 UTCJul 15, 05:00 UTC25m
2026-07-13 SZN210 - Jul 13, 15:45 UTCJul 13, 19:15 UTC3h 30m
2026-07-13 SZN332 - Jul 13, 04:25 UTCJul 13, 12:20 UTC7h 55m
2026-07-12 SZN305 - Jul 12, 08:35 UTCJul 12, 19:30 UTC10h 55m
2026-07-10 SZN210 - Jul 10, 15:25 UTCJul 10, 18:35 UTC3h 10m
2026-07-10 SZN331 - Jul 10, 04:30 UTCJul 10, 12:55 UTC8h 25m
2026-07-08 SZN305 - Jul 8, 08:30 UTCJul 8, 19:05 UTC10h 35m
2026-07-06 SZN210 - Jul 6, 15:15 UTCJul 6, 18:45 UTC3h 30m
2026-07-06 SZN332 - Jul 6, 12:05 UTCJul 6, 12:30 UTC25m
2026-07-06 SZN331 - Jul 6, 04:30 UTCJul 6, 04:50 UTC20m
2026-07-05 SZN305 - Jul 5, 08:45 UTCJul 5, 19:55 UTC11h 10m
2026-07-04 SZN1005 - Jul 4, 18:20 UTCJul 4, 18:40 UTC20m
2026-07-04 SZN1005 - Jul 4, 17:00 UTCJul 4, 17:10 UTC10m
2026-07-04 SZN1005 - Jul 4, 15:30 UTCJul 4, 16:00 UTC30m
2026-07-03 SZN306 - Jul 3, 08:15 UTCJul 3, 19:15 UTC11h 0m
2026-07-02 SZN216 - Jul 2, 15:55 UTCJul 3, 01:40 UTC9h 45m
2026-07-02 SZN332 - Jul 2, 12:15 UTCJul 2, 12:45 UTC30m
2026-07-02 SZN331 - Jul 2, 04:35 UTCJul 2, 04:50 UTC15m
2026-07-01 SZN306 - Jul 1, 08:30 UTCJul 1, 19:35 UTC11h 5m
2026-06-30 SZN1005 - Jun 30, 18:15 UTCJun 30, 18:40 UTC25m
2026-06-30 SZN1005 - Jun 30, 16:30 UTCJun 30, 16:45 UTC15m

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 LY-UNO page for operator, model, and routing details .

Mode-S 503D3D frequently asked

What is Mode-S code 503D3D?
503D3D is an ICAO 24-bit transponder address. Allocated to Lithuania. Assigned to LY-UNO.
Where is Mode-S 503D3D registered?
Mode-S code 503D3D is allocated to Lithuania (LT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 503D3D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 503D3D, octal 24036475, decimal 5,258,557.
What flights does 503D3D operate?
Mode-S 503D3D has broadcast 19 distinct callsigns, including SZN332, SZN306, SZN216, SZN331, SZN305.