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 1d ago
Flights observed
160
Distinct callsigns
18
Country
LT
Last broadcast
1d ago

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 18 distinct

Callsign Airline Flights Last seen
SZN306 - 23 2026-07-03
SZN216 - 21 2026-07-02
SZN305 - 18 2026-07-12
SZN332 - 16 2026-07-13
SZN1005 - 15 2026-07-04
SZN210 - 14 2026-07-13
SZN331 - 13 2026-07-10
SZN215 - 10 2026-06-27
SZN405 Air Senegal 9 2026-04-18
SZN209 - 8 2026-06-26
SZN406 Air Senegal 6 2026-04-18
SZN321 - 1 2026-06-13
SZN306F - 1 2026-05-17
SZN207 - 1 2026-06-28
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
2026-07-13 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
2026-06-30 SZN1005 - Jun 30, 15:15 UTCJun 30, 15:35 UTC20m
2026-06-29 SZN210 - Jun 29, 19:49 UTCJun 29, 23:14 UTC3h 25m
2026-06-29 SZN1005 - Jun 29, 18:10 UTCJun 29, 18:30 UTC20m
2026-06-29 SZN1005 - Jun 29, 16:39 UTCJun 29, 16:50 UTC10m
2026-06-29 SZN1005 - Jun 29, 15:24 UTCJun 29, 15:49 UTC25m
2026-06-29 SZN332 - Jun 29, 12:24 UTCJun 29, 13:00 UTC35m
2026-06-29 SZN331 - Jun 29, 04:34 UTCJun 29, 04:55 UTC20m
2026-06-28 SZN207 - Jun 28, 20:19 UTCJun 28, 23:39 UTC3h 20m
2026-06-28 SZN210 DSS → DSS Jun 28, 15:14 UTCJun 28, 18:40 UTC3h 25m
2026-06-28 SZN332 - Jun 28, 12:55 UTCJun 28, 13:25 UTC30m
2026-06-28 SZN331 - Jun 28, 04:25 UTCJun 28, 07:20 UTC2h 55m
2026-06-28 SZN216 - Jun 28, 00:30 UTCJun 28, 01:10 UTC40m
2026-06-27 SZN215 - Jun 27, 15:39 UTCJun 27, 15:49 UTC10m
2026-06-27 SZN332 - Jun 27, 12:39 UTCJun 27, 12:55 UTC15m
2026-06-27 SZN331 - Jun 27, 04:39 UTCJun 27, 04:59 UTC20m
2026-06-26 SZN209 - Jun 26, 15:15 UTCJun 26, 18:29 UTC3h 15m
2026-06-26 SZN332 - Jun 26, 04:34 UTCJun 26, 12:59 UTC8h 25m
2026-06-25 SZN216 - Jun 25, 15:34 UTCJun 26, 00:50 UTC9h 15m
2026-06-24 SZN210 DSS → DSS Jun 24, 15:14 UTCJun 24, 18:55 UTC3h 40m
2026-06-24 SZN332 - Jun 24, 12:09 UTCJun 24, 12:30 UTC20m
2026-06-24 SZN331 - Jun 24, 04:30 UTCJun 24, 04:55 UTC25m
2026-06-23 SZN216 - Jun 23, 16:05 UTCJun 24, 01:04 UTC9h 0m
2026-06-22 SZN305 - Jun 22, 08:25 UTCJun 22, 19:00 UTC10h 35m
2026-06-21 SZN306 COO → ABJ Jun 21, 08:49 UTCJun 21, 20:00 UTC11h 10m
2026-06-20 SZN332 - Jun 20, 04:39 UTCJun 20, 12:39 UTC8h 0m
2026-06-19 SZN210 - Jun 19, 15:29 UTCJun 19, 18:49 UTC3h 20m
2026-06-19 SZN332 - Jun 19, 12:29 UTCJun 19, 12:59 UTC30m
2026-06-19 SZN331 - Jun 19, 04:34 UTCJun 19, 05:00 UTC25m
2026-06-17 SZN210 - Jun 17, 15:40 UTCJun 17, 19:25 UTC3h 45m
2026-06-17 SZN332 - Jun 17, 12:15 UTCJun 17, 12:40 UTC25m

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 1d ago.
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 18 distinct callsigns, including SZN306, SZN216, SZN305, SZN332, SZN1005.