sensors Mode-S transponder
6831E4
ICAO 24-bit transponder address · allocated to Kazakhstan
Currently assigned to UP-B5703 · BOEING 757-200
- Hex
- 6831E4
- Octal
- 32030744
- Decimal
- 6,828,516
- Country
- KZ
- Tail
- UP-B5703
- Type
- B752
- Flights observed
- 21
- Distinct callsigns
- 14
- Country
- KZ
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 6831E4 falls within the block assigned to Kazakhstan (KZ) by ICAO Annex 10, Volume III. Every aircraft registered in Kazakhstan 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 14 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| VSV5351 | Scat Air | 3 | 2026-05-24 |
| VSV5335 | - | 2 | 2026-04-24 |
| VSV5271 | - | 2 | 2026-05-25 |
| VSV5210 | - | 2 | 2026-05-28 |
| VSV3413 | Scat Air | 2 | 2026-04-14 |
| VSV3410 | - | 2 | 2026-05-18 |
| VSV5343 | - | 1 | 2026-05-15 |
| VSV5342 | - | 1 | 2026-05-21 |
| VSV5334 | Scat Air | 1 | 2026-04-30 |
| VSV5272 | - | 1 | 2026-05-25 |
| VSV5211 | - | 1 | 2026-05-28 |
| VSV3415 | Scat Air | 1 | 2026-04-14 |
| VSV3414 | - | 1 | 2026-04-14 |
| VSV3412 | - | 1 | 2026-04-14 |
Recent flights last 21
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-28 | VSV5211 | - | May 28, 10:00 UTC | May 28, 11:50 UTC | 1h 50m |
| 2026-05-28 | VSV5210 | - | May 28, 05:30 UTC | May 28, 08:00 UTC | 2h 30m |
| 2026-05-25 | VSV5272 | - | May 25, 09:50 UTC | May 25, 11:45 UTC | 1h 55m |
| 2026-05-25 | VSV5271 | - | May 25, 07:05 UTC | May 25, 07:20 UTC | 15m |
| 2026-05-24 | VSV5271 | - | May 24, 11:05 UTC | May 25, 06:10 UTC | 19h 5m |
| 2026-05-24 | VSV5351 | ALA → NQZ | May 24, 09:05 UTC | May 25, 06:10 UTC | 21h 5m |
| 2026-05-24 | VSV5351 | ALA → NQZ | May 24, 07:05 UTC | May 25, 06:10 UTC | 23h 5m |
| 2026-05-23 | VSV5351 | ALA → NQZ | May 23, 21:00 UTC | May 24, 11:25 UTC | 14h 25m |
| 2026-05-21 | VSV5342 | - | May 21, 21:15 UTC | May 21, 21:45 UTC | 30m |
| 2026-05-18 | VSV3410 | - | May 18, 06:10 UTC | May 18, 19:25 UTC | 13h 14m |
| 2026-05-18 | VSV5210 | - | May 18, 02:00 UTC | May 18, 04:20 UTC | 2h 20m |
| 2026-05-15 | VSV5343 | - | May 15, 13:00 UTC | May 15, 13:30 UTC | 30m |
| 2026-04-30 | VSV5334 | NQZ → HKT | Apr 30, 22:15 UTC | May 1, 02:15 UTC | 4h 0m |
| 2026-04-24 | VSV5335 | - | Apr 24, 05:25 UTC | Apr 24, 10:30 UTC | 5h 5m |
| 2026-04-19 | VSV5335 | - | Apr 19, 05:25 UTC | Apr 19, 10:40 UTC | 5h 15m |
| 2026-04-14 | VSV3415 | VKO → NQZ | Apr 14, 21:55 UTC | Apr 14, 22:15 UTC | 20m |
| 2026-04-14 | VSV3414 | - | Apr 14, 17:40 UTC | Apr 14, 18:15 UTC | 35m |
| 2026-04-14 | VSV3413 | DAC → VKO | Apr 14, 10:50 UTC | Apr 14, 12:30 UTC | 1h 40m |
| 2026-04-14 | VSV3413 | DAC → VKO | Apr 14, 09:55 UTC | Apr 14, 11:05 UTC | 1h 10m |
| 2026-04-14 | VSV3412 | - | Apr 14, 05:15 UTC | Apr 14, 06:35 UTC | 1h 20m |
| 2026-04-13 | VSV3410 | - | Apr 13, 17:35 UTC | Apr 13, 17:55 UTC | 20m |
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 UP-B5703 page for operator, model, and routing details .