sensors Mode-S transponder
770591
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ALQ · AIRBUS A-330-300
- Hex
- 770591
- Octal
- 35602621
- Decimal
- 7,800,209
- Country
- LK
- Tail
- 4R-ALQ
- Type
- A333
- Flights observed
- 106
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- 9h ago
Last known position
Country allocation
The ICAO 24-bit address 770591 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 |
|---|---|---|---|
| ALK504 | SriLankan Airlines | 21 | 2026-05-27 |
| ALK503 | SriLankan Airlines | 17 | 2026-05-26 |
| ALK501 | SriLankan Airlines | 10 | 2026-05-17 |
| ALK26L | SriLankan Airlines | 7 | 2026-05-25 |
| ALK604 | SriLankan Airlines | 6 | 2026-05-28 |
| ALK25L | SriLankan Airlines | 6 | 2026-05-13 |
| ALK455 | SriLankan Airlines | 4 | 2026-04-16 |
| ALK90L | SriLankan Airlines | 3 | 2026-05-04 |
| ALK606 | SriLankan Airlines | 3 | 2026-04-26 |
| ALK605 | SriLankan Airlines | 3 | 2026-04-27 |
| ALK454 | SriLankan Airlines | 3 | 2026-04-15 |
| ALK266 | SriLankan Airlines | 3 | 2026-05-23 |
| ALK89L | SriLankan Airlines | 2 | 2026-05-04 |
| ALK600 | SriLankan Airlines | 2 | 2026-05-29 |
| ALK318 | SriLankan Airlines | 2 | 2026-04-14 |
| ALK265 | SriLankan Airlines | 2 | 2026-05-21 |
| ALK141 | SriLankan Airlines | 2 | 2026-05-19 |
| ALK101 | SriLankan Airlines | 2 | 2026-05-10 |
| ALK607 | - | 1 | 2026-04-14 |
| ALK404 | SriLankan Airlines | 1 | 2026-05-28 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | ALK600 | CMB → MEL | May 29, 09:25 UTC | May 29, 16:30 UTC | 7h 5m |
| 2026-05-29 | ALK600 | CMB → MEL | May 29, 06:30 UTC | May 29, 07:40 UTC | 1h 10m |
| 2026-05-28 | ALK604 | CMB → MEL | May 28, 13:50 UTC | May 29, 04:15 UTC | 14h 25m |
| 2026-05-28 | ALK604 | CMB → MEL | May 28, 07:25 UTC | May 29, 04:15 UTC | 20h 50m |
| 2026-05-28 | ALK404 | CMB → BKK | May 28, 04:55 UTC | May 28, 05:20 UTC | 25m |
| 2026-05-27 | ALK504 | LHR → CMB | May 27, 04:30 UTC | May 27, 23:15 UTC | 18h 45m |
| 2026-05-27 | ALK504 | LHR → CMB | May 27, 01:05 UTC | May 27, 23:15 UTC | 22h 10m |
| 2026-05-26 | ALK504 | LHR → CMB | May 26, 21:00 UTC | May 27, 13:50 UTC | 16h 50m |
| 2026-05-26 | ALK503 | CMB → LHR | May 26, 07:59 UTC | May 26, 18:55 UTC | 10h 55m |
| 2026-05-26 | ALK121 | CMB → MAA | May 26, 02:35 UTC | May 26, 02:49 UTC | 15m |
| 2026-05-25 | ALK26L | DXB → CMB | May 25, 04:35 UTC | May 25, 23:00 UTC | 18h 24m |
| 2026-05-24 | ALK504 | LHR → CMB | May 24, 23:00 UTC | May 25, 22:15 UTC | 23h 14m |
| 2026-05-24 | ALK504 | LHR → CMB | May 24, 20:55 UTC | May 25, 14:10 UTC | 17h 15m |
| 2026-05-24 | ALK503 | CMB → LHR | May 24, 08:00 UTC | May 24, 18:50 UTC | 10h 50m |
| 2026-05-23 | ALK266 | RUH → CMB | May 23, 13:15 UTC | May 24, 00:55 UTC | 11h 41m |
| 2026-05-22 | ALK504 | LHR → CMB | May 22, 21:05 UTC | May 23, 06:40 UTC | 9h 34m |
| 2026-05-22 | ALK503 | CMB → LHR | May 22, 08:05 UTC | May 22, 19:20 UTC | 11h 15m |
| 2026-05-21 | ALK265 | CMB → RUH | May 21, 13:30 UTC | May 22, 00:20 UTC | 10h 50m |
| 2026-05-20 | ALK504 | LHR → CMB | May 20, 20:55 UTC | May 21, 07:00 UTC | 10h 5m |
| 2026-05-20 | ALK503 | CMB → LHR | May 20, 05:05 UTC | May 20, 18:55 UTC | 13h 50m |
| 2026-05-19 | ALK142 | BOM → CMB | May 19, 21:55 UTC | May 19, 23:35 UTC | 1h 40m |
| 2026-05-19 | ALK141 | CMB → BOM | May 19, 20:15 UTC | May 19, 20:25 UTC | 10m |
| 2026-05-19 | ALK141 | CMB → BOM | May 19, 18:40 UTC | May 19, 19:40 UTC | 1h 0m |
| 2026-05-17 | ALK501 | CMB → LHR | May 17, 14:10 UTC | May 17, 23:45 UTC | 9h 35m |
| 2026-05-17 | ALK501 | CMB → LHR | May 17, 11:01 UTC | May 17, 11:55 UTC | 55m |
| 2026-05-16 | ALK501 | CMB → LHR | May 16, 22:45 UTC | May 17, 05:40 UTC | 6h 55m |
| 2026-05-16 | ALK501 | CMB → LHR | May 16, 09:25 UTC | May 17, 05:40 UTC | 20h 15m |
| 2026-05-16 | ALK501 | CMB → LHR | May 16, 06:25 UTC | May 17, 05:40 UTC | 23h 15m |
| 2026-05-16 | ALK604 | CMB → MEL | May 16, 03:10 UTC | May 16, 04:25 UTC | 1h 15m |
| 2026-05-14 | ALK504 | LHR → CMB | May 14, 23:20 UTC | May 15, 09:25 UTC | 10h 5m |
| 2026-05-14 | ALK503 | CMB → LHR | May 14, 02:25 UTC | May 14, 19:30 UTC | 17h 5m |
| 2026-05-13 | ALK26L | DXB → CMB | May 13, 22:30 UTC | May 13, 23:15 UTC | 45m |
| 2026-05-13 | ALK25L | CMB → DXB | May 13, 17:05 UTC | May 13, 17:15 UTC | 10m |
| 2026-05-13 | ALK25L | CMB → DXB | May 13, 13:31 UTC | May 13, 14:10 UTC | 40m |
| 2026-05-12 | ALK504 | LHR → CMB | May 12, 20:55 UTC | May 13, 06:50 UTC | 9h 55m |
| 2026-05-12 | ALK503 | CMB → LHR | May 12, 05:10 UTC | May 12, 19:00 UTC | 13h 50m |
| 2026-05-11 | ALK503 | CMB → LHR | May 11, 13:30 UTC | May 12, 10:15 UTC | 20h 46m |
| 2026-05-11 | ALK25L | CMB → DXB | May 11, 06:20 UTC | May 12, 05:20 UTC | 23h 1m |
| 2026-05-10 | ALK504 | LHR → CMB | May 10, 21:00 UTC | May 11, 14:05 UTC | 17h 5m |
| 2026-05-10 | ALK503 | CMB → LHR | May 10, 08:05 UTC | May 10, 19:00 UTC | 10h 55m |
| 2026-05-10 | ALK101 | CMB → MLE | May 10, 02:20 UTC | May 10, 05:20 UTC | 3h 0m |
| 2026-05-08 | ALK265 | CMB → RUH | May 8, 13:05 UTC | May 9, 00:20 UTC | 11h 15m |
| 2026-05-07 | ALK504 | LHR → CMB | May 7, 21:10 UTC | May 8, 06:30 UTC | 9h 20m |
| 2026-05-07 | ALK503 | CMB → LHR | May 7, 08:00 UTC | May 7, 19:20 UTC | 11h 20m |
| 2026-05-06 | ALK503 | CMB → LHR | May 6, 10:05 UTC | May 7, 08:15 UTC | 22h 10m |
| 2026-05-05 | ALK504 | LHR → CMB | May 5, 20:55 UTC | May 6, 10:15 UTC | 13h 20m |
| 2026-05-05 | ALK503 | CMB → LHR | May 5, 02:25 UTC | May 5, 19:15 UTC | 16h 50m |
| 2026-05-04 | ALK26L | DXB → CMB | May 4, 22:30 UTC | May 4, 23:15 UTC | 45m |
| 2026-05-04 | ALK26L | DXB → CMB | May 4, 19:35 UTC | May 4, 19:55 UTC | 20m |
| 2026-05-04 | ALK25L | CMB → DXB | May 4, 13:25 UTC | May 4, 13:55 UTC | 30m |
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-ALQ page for operator, model, and routing details .