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
- Flights observed
- 81
- Distinct callsigns
- 15
- Country
- LT
- Last broadcast
- 1h ago
Last known position
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 15 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| SZN306 | Air Senegal | 16 | 2026-05-29 |
| SZN216 | Air Senegal | 11 | 2026-05-29 |
| SZN405 | Air Senegal | 9 | 2026-04-18 |
| SZN305 | Air Senegal | 9 | 2026-05-29 |
| SZN209 | Air Senegal | 7 | 2026-05-04 |
| SZN406 | Air Senegal | 6 | 2026-04-18 |
| SZN1005 | - | 6 | 2026-04-14 |
| SZN215 | Air Senegal | 5 | 2026-05-30 |
| SZN210 | Air Senegal | 5 | 2026-05-08 |
| SZN332 | Air Senegal | 2 | 2026-05-09 |
| SZN331 | - | 1 | 2026-04-13 |
| SZN306F | - | 1 | 2026-05-17 |
| SZN105 | - | 1 | 2026-04-12 |
| SZ209 | - | 1 | 2026-04-26 |
| HC215 | - | 1 | 2026-04-23 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | SZN215 | DSS → CKY | May 30, 16:10 UTC | May 30, 16:30 UTC | 20m |
| 2026-05-29 | SZN306 | COO → ABJ | May 29, 19:15 UTC | May 29, 20:00 UTC | 45m |
| 2026-05-29 | SZN305 | ABJ → COO | May 29, 08:25 UTC | May 29, 09:05 UTC | 40m |
| 2026-05-29 | SZN216 | CKY → DSS | May 29, 01:30 UTC | May 29, 01:50 UTC | 20m |
| 2026-05-28 | SZN215 | DSS → CKY | May 28, 16:00 UTC | May 28, 16:20 UTC | 20m |
| 2026-05-25 | SZN306 | COO → ABJ | May 25, 21:49 UTC | May 25, 22:25 UTC | 35m |
| 2026-05-25 | SZN305 | ABJ → COO | May 25, 09:20 UTC | May 25, 09:50 UTC | 30m |
| 2026-05-24 | SZN306 | - | May 24, 18:55 UTC | May 24, 19:35 UTC | 40m |
| 2026-05-24 | SZN305 | ABJ → COO | May 24, 08:25 UTC | May 24, 09:15 UTC | 50m |
| 2026-05-23 | SZN216 | CKY → DSS | May 23, 16:00 UTC | May 24, 02:35 UTC | 10h 36m |
| 2026-05-22 | SZN305 | ABJ → COO | May 22, 08:50 UTC | May 22, 21:30 UTC | 12h 40m |
| 2026-05-21 | SZN216 | CKY → DSS | May 21, 16:25 UTC | May 22, 02:25 UTC | 10h 0m |
| 2026-05-20 | SZN306 | - | May 20, 08:15 UTC | May 20, 19:10 UTC | 10h 55m |
| 2026-05-19 | SZN216 | CKY → DSS | May 19, 16:15 UTC | May 20, 02:15 UTC | 10h 0m |
| 2026-05-18 | SZN306 | - | May 18, 08:45 UTC | May 18, 20:00 UTC | 11h 14m |
| 2026-05-17 | SZN306F | - | May 17, 16:40 UTC | May 17, 17:25 UTC | 45m |
| 2026-05-10 | SZN305 | ABJ → COO | May 10, 09:00 UTC | May 10, 09:35 UTC | 35m |
| 2026-05-09 | SZN215 | DSS → CKY | May 9, 16:05 UTC | May 10, 02:10 UTC | 10h 5m |
| 2026-05-09 | SZN332 | CMN → DSS | May 9, 05:05 UTC | May 9, 13:30 UTC | 8h 25m |
| 2026-05-08 | SZN210 | CKY → DSS | May 8, 21:55 UTC | May 9, 01:30 UTC | 3h 35m |
| 2026-05-08 | SZN306 | COO → ABJ | May 8, 07:59 UTC | May 8, 19:05 UTC | 11h 5m |
| 2026-05-07 | SZN215 | DSS → CKY | May 7, 15:50 UTC | May 8, 01:45 UTC | 9h 55m |
| 2026-05-06 | SZN210 | CKY → DSS | May 6, 21:15 UTC | May 7, 00:55 UTC | 3h 40m |
| 2026-05-06 | SZN306 | COO → ABJ | May 6, 08:15 UTC | May 6, 19:15 UTC | 10h 59m |
| 2026-05-05 | SZN216 | CKY → DSS | May 5, 16:25 UTC | May 6, 02:20 UTC | 9h 55m |
| 2026-05-05 | SZN210 | CKY → DSS | May 5, 00:35 UTC | May 5, 01:05 UTC | 30m |
| 2026-05-04 | SZN209 | DSS → CKY | May 4, 21:15 UTC | May 4, 22:00 UTC | 45m |
| 2026-05-04 | SZN306 | COO → ABJ | May 4, 08:15 UTC | May 4, 19:10 UTC | 10h 56m |
| 2026-05-03 | SZN306 | COO → ABJ | May 3, 09:20 UTC | May 4, 01:00 UTC | 15h 40m |
| 2026-05-02 | SZN216 | CKY → DSS | May 2, 15:40 UTC | May 3, 01:15 UTC | 9h 35m |
| 2026-05-01 | SZN306 | COO → ABJ | May 1, 08:40 UTC | May 1, 19:40 UTC | 11h 0m |
| 2026-04-30 | SZN216 | CKY → DSS | Apr 30, 15:30 UTC | May 1, 02:30 UTC | 11h 0m |
| 2026-04-29 | SZN209 | DSS → CKY | Apr 29, 22:00 UTC | Apr 30, 01:10 UTC | 3h 9m |
| 2026-04-29 | SZN305 | ABJ → COO | Apr 29, 08:45 UTC | Apr 29, 19:45 UTC | 11h 1m |
| 2026-04-28 | SZN216 | CKY → DSS | Apr 28, 16:00 UTC | Apr 29, 02:45 UTC | 10h 45m |
| 2026-04-27 | SZN210 | CKY → DSS | Apr 27, 23:55 UTC | Apr 28, 00:35 UTC | 40m |
| 2026-04-27 | SZN209 | DSS → CKY | Apr 27, 20:45 UTC | Apr 27, 21:10 UTC | 25m |
| 2026-04-27 | SZN306 | COO → ABJ | Apr 27, 08:35 UTC | Apr 27, 19:15 UTC | 10h 40m |
| 2026-04-26 | SZ209 | - | Apr 26, 21:15 UTC | Apr 27, 00:50 UTC | 3h 35m |
| 2026-04-26 | SZN305 | ABJ → COO | Apr 26, 08:20 UTC | Apr 26, 19:20 UTC | 11h 0m |
| 2026-04-25 | SZN216 | CKY → DSS | Apr 25, 16:05 UTC | Apr 26, 01:45 UTC | 9h 40m |
| 2026-04-24 | SZN209 | DSS → CKY | Apr 24, 21:50 UTC | Apr 25, 01:20 UTC | 3h 30m |
| 2026-04-24 | SZN306 | COO → ABJ | Apr 24, 08:25 UTC | Apr 24, 20:15 UTC | 11h 50m |
| 2026-04-23 | HC215 | - | Apr 23, 16:05 UTC | Apr 24, 01:40 UTC | 9h 35m |
| 2026-04-22 | SZN209 | DSS → CKY | Apr 22, 21:05 UTC | Apr 23, 00:45 UTC | 3h 40m |
| 2026-04-22 | SZN306 | COO → ABJ | Apr 22, 08:35 UTC | Apr 22, 19:10 UTC | 10h 35m |
| 2026-04-21 | SZN215 | DSS → CKY | Apr 21, 15:25 UTC | Apr 22, 02:15 UTC | 10h 50m |
| 2026-04-20 | SZN210 | CKY → DSS | Apr 20, 21:45 UTC | Apr 21, 01:15 UTC | 3h 30m |
| 2026-04-20 | SZN306 | COO → ABJ | Apr 20, 08:55 UTC | Apr 20, 20:05 UTC | 11h 10m |
| 2026-04-19 | SZN306 | COO → ABJ | Apr 19, 08:55 UTC | Apr 19, 20:40 UTC | 11h 45m |
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 .