sensors Mode-S transponder
770592
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ALR · AIRBUS A-330-300
- Hex
- 770592
- Octal
- 35602622
- Decimal
- 7,800,210
- Country
- LK
- Tail
- 4R-ALR
- Type
- A333
- Flights observed
- 117
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- 5h ago
Last known position
Country allocation
The ICAO 24-bit address 770592 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 |
|---|---|---|---|
| ALK503 | SriLankan Airlines | 19 | 2026-05-29 |
| ALK504 | SriLankan Airlines | 17 | 2026-05-29 |
| ALK604 | SriLankan Airlines | 14 | 2026-05-21 |
| ALK501 | SriLankan Airlines | 12 | 2026-05-13 |
| ALK605 | SriLankan Airlines | 10 | 2026-05-21 |
| ALK600 | SriLankan Airlines | 10 | 2026-05-22 |
| ALK266 | SriLankan Airlines | 5 | 2026-05-28 |
| ALK90L | SriLankan Airlines | 4 | 2026-05-14 |
| ALK25L | SriLankan Airlines | 4 | 2026-05-26 |
| ALK606 | SriLankan Airlines | 3 | 2026-05-03 |
| ALK26L | SriLankan Airlines | 3 | 2026-05-10 |
| ALK89L | SriLankan Airlines | 2 | 2026-05-11 |
| ALK607 | SriLankan Airlines | 2 | 2026-05-03 |
| ALK405 | SriLankan Airlines | 2 | 2026-04-23 |
| ALK404 | SriLankan Airlines | 2 | 2026-04-23 |
| ALK265 | - | 2 | 2026-04-15 |
| ALK121 | SriLankan Airlines | 2 | 2026-05-27 |
| ALK153 | SriLankan Airlines | 1 | 2026-04-19 |
| ALK115 | SriLankan Airlines | 1 | 2026-04-13 |
| ALK104 | SriLankan Airlines | 1 | 2026-04-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | ALK504 | LHR → CMB | May 29, 21:30 UTC | May 30, 07:00 UTC | 9h 30m |
| 2026-05-29 | ALK503 | CMB → LHR | May 29, 07:55 UTC | May 29, 19:10 UTC | 11h 15m |
| 2026-05-28 | ALK266 | RUH → CMB | May 28, 04:35 UTC | May 29, 00:25 UTC | 19h 50m |
| 2026-05-28 | ALK266 | RUH → CMB | May 28, 04:15 UTC | May 29, 00:25 UTC | 20h 10m |
| 2026-05-28 | ALK504 | LHR → CMB | May 28, 00:40 UTC | May 29, 00:25 UTC | 23h 45m |
| 2026-05-27 | ALK504 | LHR → CMB | May 27, 22:35 UTC | May 28, 20:45 UTC | 22h 10m |
| 2026-05-27 | ALK504 | LHR → CMB | May 27, 20:55 UTC | May 28, 20:30 UTC | 23h 35m |
| 2026-05-27 | ALK503 | CMB → LHR | May 27, 07:55 UTC | May 27, 19:00 UTC | 11h 5m |
| 2026-05-27 | ALK121 | CMB → MAA | May 27, 02:39 UTC | May 27, 02:54 UTC | 15m |
| 2026-05-26 | ALK25L | CMB → DXB | May 26, 13:24 UTC | May 26, 22:59 UTC | 9h 35m |
| 2026-05-25 | ALK504 | LHR → CMB | May 25, 20:59 UTC | May 26, 06:29 UTC | 9h 30m |
| 2026-05-25 | ALK503 | CMB → LHR | May 25, 08:05 UTC | May 25, 19:05 UTC | 11h 0m |
| 2026-05-23 | ALK504 | LHR → CMB | May 23, 21:00 UTC | May 24, 14:05 UTC | 17h 5m |
| 2026-05-23 | ALK503 | CMB → LHR | May 23, 07:55 UTC | May 23, 19:00 UTC | 11h 6m |
| 2026-05-22 | ALK600 | CMB → MEL | May 22, 09:30 UTC | May 22, 13:25 UTC | 3h 55m |
| 2026-05-22 | ALK600 | CMB → MEL | May 22, 06:40 UTC | May 22, 07:40 UTC | 1h 0m |
| 2026-05-22 | ALK600 | CMB → MEL | May 22, 03:20 UTC | May 22, 04:40 UTC | 1h 20m |
| 2026-05-21 | ALK600 | CMB → MEL | May 21, 09:40 UTC | May 22, 04:40 UTC | 19h 0m |
| 2026-05-21 | ALK605 | MEL → CMB | May 21, 06:45 UTC | May 22, 04:40 UTC | 21h 55m |
| 2026-05-21 | ALK604 | CMB → MEL | May 21, 03:10 UTC | May 21, 04:20 UTC | 1h 10m |
| 2026-05-20 | ALK605 | MEL → CMB | May 20, 06:45 UTC | May 21, 04:20 UTC | 21h 35m |
| 2026-05-20 | ALK604 | CMB → MEL | May 20, 03:15 UTC | May 20, 04:30 UTC | 1h 15m |
| 2026-05-18 | ALK504 | LHR → CMB | May 18, 21:05 UTC | May 19, 07:10 UTC | 10h 5m |
| 2026-05-18 | ALK503 | CMB → LHR | May 18, 02:25 UTC | May 18, 19:05 UTC | 16h 39m |
| 2026-05-17 | ALK503 | CMB → LHR | May 17, 13:20 UTC | May 18, 10:25 UTC | 21h 5m |
| 2026-05-17 | ALK600 | CMB → MEL | May 17, 11:10 UTC | May 18, 10:25 UTC | 23h 15m |
| 2026-05-17 | ALK600 | CMB → MEL | May 17, 09:55 UTC | May 18, 05:35 UTC | 19h 40m |
| 2026-05-17 | ALK600 | CMB → MEL | May 17, 06:25 UTC | May 17, 07:40 UTC | 1h 15m |
| 2026-05-17 | ALK600 | CMB → MEL | May 17, 03:25 UTC | May 17, 04:20 UTC | 55m |
| 2026-05-16 | ALK600 | CMB → MEL | May 16, 06:55 UTC | May 17, 04:20 UTC | 21h 25m |
| 2026-05-16 | ALK600 | CMB → MEL | May 16, 04:55 UTC | May 17, 04:20 UTC | 23h 25m |
| 2026-05-15 | ALK504 | LHR → CMB | May 15, 21:15 UTC | May 16, 07:05 UTC | 9h 51m |
| 2026-05-15 | ALK503 | CMB → LHR | May 15, 08:30 UTC | May 15, 19:15 UTC | 10h 44m |
| 2026-05-14 | ALK503 | CMB → LHR | May 14, 23:40 UTC | May 15, 19:15 UTC | 19h 34m |
| 2026-05-14 | ALK503 | CMB → LHR | May 14, 20:35 UTC | May 15, 19:15 UTC | 22h 39m |
| 2026-05-14 | ALK503 | CMB → LHR | May 14, 20:20 UTC | May 15, 18:30 UTC | 22h 9m |
| 2026-05-14 | ALK266 | RUH → CMB | May 14, 13:20 UTC | May 15, 10:30 UTC | 21h 10m |
| 2026-05-14 | ALK90L | DAC → CMB | May 14, 08:10 UTC | May 14, 09:35 UTC | 1h 25m |
| 2026-05-13 | ALK501 | CMB → LHR | May 13, 15:45 UTC | May 14, 06:20 UTC | 14h 35m |
| 2026-05-13 | ALK501 | CMB → LHR | May 13, 12:25 UTC | May 13, 13:15 UTC | 50m |
| 2026-05-12 | ALK501 | CMB → LHR | May 12, 23:25 UTC | May 13, 10:30 UTC | 11h 5m |
| 2026-05-12 | ALK605 | MEL → CMB | May 12, 06:30 UTC | May 12, 07:45 UTC | 1h 15m |
| 2026-05-12 | ALK604 | CMB → MEL | May 12, 03:20 UTC | May 12, 04:45 UTC | 1h 25m |
| 2026-05-11 | ALK604 | CMB → MEL | May 11, 08:35 UTC | May 12, 04:45 UTC | 20h 11m |
| 2026-05-11 | ALK90L | DAC → CMB | May 11, 07:45 UTC | May 12, 04:45 UTC | 21h 0m |
| 2026-05-11 | ALK89L | CMB → TRZ | May 11, 03:05 UTC | May 11, 05:05 UTC | 2h 0m |
| 2026-05-10 | ALK26L | DXB → CMB | May 10, 13:19 UTC | May 10, 22:55 UTC | 9h 35m |
| 2026-05-09 | ALK504 | LHR → CMB | May 9, 21:14 UTC | May 10, 06:50 UTC | 9h 35m |
| 2026-05-09 | ALK503 | CMB → LHR | May 9, 08:00 UTC | May 9, 19:19 UTC | 11h 20m |
| 2026-05-08 | ALK501 | CMB → LHR | May 8, 14:00 UTC | May 9, 05:20 UTC | 15h 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 4R-ALR page for operator, model, and routing details .