sensors Mode-S transponder
7705C6
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ANF · AIRBUS A-321neo
- Hex
- 7705C6
- Octal
- 35602706
- Decimal
- 7,800,262
- Country
- LK
- Tail
- 4R-ANF
- Type
- A21N
- Flights observed
- 146
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- 47m ago
Last known position
Country allocation
The ICAO 24-bit address 7705C6 falls within the block assigned to Sri Lanka (LK) by ICAO Annex 10, Volume III. Every aircraft registered in Sri Lanka 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 |
|---|---|---|---|
| ALK253 | SriLankan Airlines | 23 | 2026-05-25 |
| ALK254 | SriLankan Airlines | 19 | 2026-05-25 |
| ALK142 | SriLankan Airlines | 9 | 2026-05-29 |
| ALK141 | SriLankan Airlines | 9 | 2026-05-29 |
| ALK405 | SriLankan Airlines | 7 | 2026-05-17 |
| ALK404 | SriLankan Airlines | 6 | 2026-05-30 |
| ALK166 | SriLankan Airlines | 6 | 2026-05-19 |
| ALK364 | SriLankan Airlines | 5 | 2026-05-24 |
| ALK318 | SriLankan Airlines | 5 | 2026-05-24 |
| ALK165 | SriLankan Airlines | 5 | 2026-05-19 |
| ALK314 | SriLankan Airlines | 4 | 2026-05-28 |
| ALK124 | SriLankan Airlines | 4 | 2026-05-17 |
| ALK123 | SriLankan Airlines | 4 | 2026-05-08 |
| ALK319 | SriLankan Airlines | 3 | 2026-05-23 |
| ALK173 | SriLankan Airlines | 3 | 2026-05-26 |
| ALK89L | SriLankan Airlines | 2 | 2026-05-28 |
| ALK881 | - | 2 | 2026-04-14 |
| ALK365 | SriLankan Airlines | 2 | 2026-05-10 |
| ALK174 | SriLankan Airlines | 2 | 2026-05-26 |
| ALK168 | SriLankan Airlines | 2 | 2026-05-08 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | ALK404 | CMB → BKK | May 30, 05:05 UTC | May 30, 05:30 UTC | 25m |
| 2026-05-29 | ALK142 | BOM → CMB | May 29, 22:40 UTC | May 29, 23:35 UTC | 55m |
| 2026-05-29 | ALK142 | BOM → CMB | May 29, 21:55 UTC | May 29, 22:05 UTC | 10m |
| 2026-05-29 | ALK141 | CMB → BOM | May 29, 20:15 UTC | May 29, 20:30 UTC | 15m |
| 2026-05-29 | ALK141 | CMB → BOM | May 29, 18:40 UTC | May 29, 19:40 UTC | 1h 0m |
| 2026-05-29 | ALK90L | DAC → CMB | May 29, 07:05 UTC | May 29, 08:25 UTC | 1h 20m |
| 2026-05-28 | ALK89L | CMB → TRZ | May 28, 13:30 UTC | May 29, 05:30 UTC | 16h 0m |
| 2026-05-28 | ALK89L | CMB → TRZ | May 28, 07:35 UTC | May 29, 05:30 UTC | 21h 55m |
| 2026-05-28 | ALK314 | CMB → KUL | May 28, 05:20 UTC | May 28, 05:45 UTC | 25m |
| 2026-05-27 | ALK142 | BOM → CMB | May 27, 22:35 UTC | May 27, 23:35 UTC | 1h 0m |
| 2026-05-27 | ALK142 | BOM → CMB | May 27, 21:55 UTC | May 27, 22:05 UTC | 10m |
| 2026-05-27 | ALK141 | CMB → BOM | May 27, 20:25 UTC | May 27, 20:35 UTC | 10m |
| 2026-05-27 | ALK141 | CMB → BOM | May 27, 08:40 UTC | May 27, 19:50 UTC | 11h 10m |
| 2026-05-26 | ALK174 | BLR → CMB | May 26, 22:29 UTC | May 27, 05:29 UTC | 7h 0m |
| 2026-05-26 | ALK173 | CMB → BLR | May 26, 16:05 UTC | May 26, 20:50 UTC | 4h 45m |
| 2026-05-25 | ALK254 | DMM → CMB | May 25, 19:35 UTC | May 26, 00:00 UTC | 4h 25m |
| 2026-05-25 | ALK253 | CMB → DMM | May 25, 17:35 UTC | May 25, 17:45 UTC | 10m |
| 2026-05-25 | ALK253 | CMB → DMM | May 25, 13:20 UTC | May 25, 14:00 UTC | 40m |
| 2026-05-24 | ALK318 | CMB → KUL | May 24, 23:00 UTC | May 24, 23:10 UTC | 10m |
| 2026-05-24 | ALK364 | CMB → CGK | May 24, 06:15 UTC | May 24, 06:25 UTC | 10m |
| 2026-05-24 | ALK364 | CMB → CGK | May 24, 05:15 UTC | May 24, 05:40 UTC | 25m |
| 2026-05-23 | ALK254 | DMM → CMB | May 23, 19:25 UTC | May 23, 23:40 UTC | 4h 15m |
| 2026-05-23 | ALK253 | CMB → DMM | May 23, 07:25 UTC | May 23, 13:45 UTC | 6h 20m |
| 2026-05-23 | ALK319 | KUL → CMB | May 23, 00:55 UTC | May 23, 01:10 UTC | 15m |
| 2026-05-22 | ALK196 | DEL → CMB | May 22, 13:30 UTC | May 22, 23:00 UTC | 9h 30m |
| 2026-05-22 | ALK195 | CMB → DEL | May 22, 09:20 UTC | May 22, 11:45 UTC | 2h 25m |
| 2026-05-21 | ALK254 | DMM → CMB | May 21, 19:45 UTC | May 21, 23:55 UTC | 4h 10m |
| 2026-05-21 | ALK253 | CMB → DMM | May 21, 17:40 UTC | May 21, 17:50 UTC | 10m |
| 2026-05-21 | ALK253 | CMB → DMM | May 21, 07:15 UTC | May 21, 13:50 UTC | 6h 35m |
| 2026-05-21 | ALK314 | CMB → KUL | May 21, 05:05 UTC | May 21, 05:35 UTC | 30m |
| 2026-05-20 | ALK142 | BOM → CMB | May 20, 22:35 UTC | May 20, 23:35 UTC | 1h 0m |
| 2026-05-20 | ALK142 | BOM → CMB | May 20, 21:50 UTC | May 20, 22:00 UTC | 10m |
| 2026-05-20 | ALK141 | CMB → BOM | May 20, 20:15 UTC | May 20, 20:35 UTC | 20m |
| 2026-05-20 | ALK141 | CMB → BOM | May 20, 02:50 UTC | May 20, 19:40 UTC | 16h 51m |
| 2026-05-19 | ALK177 | CMB → HYD | May 19, 16:10 UTC | May 20, 11:30 UTC | 19h 21m |
| 2026-05-19 | ALK166 | COK → CMB | May 19, 04:50 UTC | May 19, 05:20 UTC | 30m |
| 2026-05-19 | ALK165 | CMB → COK | May 19, 03:00 UTC | May 19, 03:35 UTC | 35m |
| 2026-05-18 | ALK253 | CMB → DMM | May 18, 12:30 UTC | May 19, 00:25 UTC | 11h 54m |
| 2026-05-18 | ALK319 | KUL → CMB | May 18, 01:15 UTC | May 18, 01:35 UTC | 20m |
| 2026-05-17 | ALK318 | CMB → KUL | May 17, 22:40 UTC | May 17, 23:10 UTC | 30m |
| 2026-05-17 | ALK124 | MAA → CMB | May 17, 16:10 UTC | May 17, 16:20 UTC | 10m |
| 2026-05-17 | ALK405 | BKK → CMB | May 17, 07:20 UTC | May 17, 07:40 UTC | 20m |
| 2026-05-16 | ALK254 | DMM → CMB | May 16, 19:40 UTC | May 17, 05:35 UTC | 9h 55m |
| 2026-05-16 | ALK253 | CMB → DMM | May 16, 17:20 UTC | May 16, 17:40 UTC | 20m |
| 2026-05-16 | ALK253 | CMB → DMM | May 16, 13:15 UTC | May 16, 13:46 UTC | 30m |
| 2026-05-16 | ALK166 | COK → CMB | May 16, 04:55 UTC | May 16, 05:25 UTC | 30m |
| 2026-05-16 | ALK165 | CMB → COK | May 16, 03:10 UTC | May 16, 03:30 UTC | 20m |
| 2026-05-15 | ALK142 | BOM → CMB | May 15, 22:45 UTC | May 16, 00:30 UTC | 1h 45m |
| 2026-05-15 | ALK141 | CMB → BOM | May 15, 21:05 UTC | May 15, 21:15 UTC | 10m |
| 2026-05-15 | ALK141 | CMB → BOM | May 15, 19:30 UTC | May 15, 20:30 UTC | 1h 0m |
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 4R-ANF page for operator, model, and routing details .