sensors Mode-S transponder
770590
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ALP · AIRBUS A-330-300
- Hex
- 770590
- Octal
- 35602620
- Decimal
- 7,800,208
- Country
- LK
- Tail
- 4R-ALP
- Type
- A333
- Flights observed
- 103
- Distinct callsigns
- 19
- Country
- LK
- Last broadcast
- 5h ago
Last known position
Country allocation
The ICAO 24-bit address 770590 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| ALK503 | SriLankan Airlines | 20 | 2026-05-19 |
| ALK501 | SriLankan Airlines | 15 | 2026-05-22 |
| ALK504 | SriLankan Airlines | 14 | 2026-05-19 |
| ALK604 | SriLankan Airlines | 12 | 2026-05-18 |
| ALK605 | SriLankan Airlines | 7 | 2026-05-18 |
| ALK606 | SriLankan Airlines | 5 | 2026-05-09 |
| ALK564 | SriLankan Airlines | 5 | 2026-04-15 |
| ALK563 | SriLankan Airlines | 4 | 2026-04-15 |
| ALK607 | SriLankan Airlines | 3 | 2026-05-09 |
| ALK26L | SriLankan Airlines | 3 | 2026-05-29 |
| ALK101 | SriLankan Airlines | 3 | 2026-05-18 |
| ALK471 | SriLankan Airlines | 2 | 2026-04-20 |
| ALK266 | SriLankan Airlines | 2 | 2026-04-17 |
| ALK265 | - | 2 | 2026-04-17 |
| ALK102 | SriLankan Airlines | 2 | 2026-04-18 |
| ALK90L | SriLankan Airlines | 1 | 2026-05-21 |
| ALK89L | SriLankan Airlines | 1 | 2026-05-21 |
| ALK470 | SriLankan Airlines | 1 | 2026-04-19 |
| ALK25L | SriLankan Airlines | 1 | 2026-05-12 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | ALK26L | DXB → CMB | May 29, 13:25 UTC | May 29, 22:50 UTC | 9h 25m |
| 2026-05-22 | ALK501 | CMB → LHR | May 22, 14:00 UTC | May 22, 23:00 UTC | 9h 0m |
| 2026-05-22 | ALK501 | CMB → LHR | May 22, 11:20 UTC | May 22, 12:05 UTC | 46m |
| 2026-05-21 | ALK501 | CMB → LHR | May 21, 22:45 UTC | May 22, 09:30 UTC | 10h 45m |
| 2026-05-21 | ALK90L | DAC → CMB | May 21, 07:45 UTC | May 21, 16:55 UTC | 9h 10m |
| 2026-05-21 | ALK89L | CMB → TRZ | May 21, 04:50 UTC | May 21, 05:15 UTC | 25m |
| 2026-05-20 | ALK26L | DXB → CMB | May 20, 13:30 UTC | May 20, 23:00 UTC | 9h 30m |
| 2026-05-19 | ALK504 | LHR → CMB | May 19, 21:05 UTC | May 20, 01:05 UTC | 4h 0m |
| 2026-05-19 | ALK503 | CMB → LHR | May 19, 02:20 UTC | May 19, 19:10 UTC | 16h 50m |
| 2026-05-18 | ALK101 | CMB → MLE | May 18, 09:25 UTC | May 19, 05:25 UTC | 19h 59m |
| 2026-05-18 | ALK605 | MEL → CMB | May 18, 06:35 UTC | May 19, 05:25 UTC | 22h 49m |
| 2026-05-18 | ALK604 | CMB → MEL | May 18, 03:25 UTC | May 18, 04:25 UTC | 1h 0m |
| 2026-05-16 | ALK504 | LHR → CMB | May 16, 20:50 UTC | May 17, 03:05 UTC | 6h 15m |
| 2026-05-16 | ALK503 | CMB → LHR | May 16, 08:16 UTC | May 16, 18:55 UTC | 10h 40m |
| 2026-05-15 | ALK503 | CMB → LHR | May 15, 19:50 UTC | May 16, 18:00 UTC | 22h 11m |
| 2026-05-15 | ALK503 | CMB → LHR | May 15, 16:05 UTC | May 16, 15:10 UTC | 23h 6m |
| 2026-05-15 | ALK501 | CMB → LHR | May 15, 14:20 UTC | May 16, 14:01 UTC | 23h 40m |
| 2026-05-15 | ALK501 | CMB → LHR | May 15, 11:35 UTC | May 15, 12:35 UTC | 1h 0m |
| 2026-05-14 | ALK501 | CMB → LHR | May 14, 23:00 UTC | May 15, 09:40 UTC | 10h 40m |
| 2026-05-13 | ALK504 | LHR → CMB | May 13, 21:50 UTC | May 14, 08:00 UTC | 10h 10m |
| 2026-05-13 | ALK503 | CMB → LHR | May 13, 08:10 UTC | May 13, 19:20 UTC | 11h 10m |
| 2026-05-13 | ALK101 | CMB → MLE | May 13, 02:25 UTC | May 13, 05:25 UTC | 3h 0m |
| 2026-05-12 | ALK26L | DXB → CMB | May 12, 22:31 UTC | May 12, 23:10 UTC | 40m |
| 2026-05-12 | ALK25L | CMB → DXB | May 12, 17:15 UTC | May 12, 17:25 UTC | 10m |
| 2026-05-11 | ALK504 | LHR → CMB | May 11, 21:05 UTC | May 12, 14:20 UTC | 17h 15m |
| 2026-05-11 | ALK503 | CMB → LHR | May 11, 07:55 UTC | May 11, 19:30 UTC | 11h 35m |
| 2026-05-10 | ALK501 | CMB → LHR | May 10, 13:40 UTC | May 11, 05:10 UTC | 15h 30m |
| 2026-05-10 | ALK501 | CMB → LHR | May 10, 11:00 UTC | May 10, 11:50 UTC | 50m |
| 2026-05-09 | ALK501 | CMB → LHR | May 9, 22:25 UTC | May 10, 09:10 UTC | 10h 45m |
| 2026-05-09 | ALK607 | SYD → CMB | May 9, 08:40 UTC | May 9, 12:00 UTC | 3h 20m |
| 2026-05-09 | ALK606 | CMB → SYD | May 9, 06:00 UTC | May 9, 06:35 UTC | 35m |
| 2026-05-08 | ALK606 | CMB → SYD | May 8, 10:04 UTC | May 9, 06:35 UTC | 20h 30m |
| 2026-05-08 | ALK607 | SYD → CMB | May 8, 08:29 UTC | May 9, 06:35 UTC | 22h 5m |
| 2026-05-08 | ALK606 | CMB → SYD | May 8, 04:34 UTC | May 8, 05:29 UTC | 55m |
| 2026-05-07 | ALK606 | CMB → SYD | May 7, 08:05 UTC | May 8, 05:29 UTC | 21h 24m |
| 2026-05-07 | ALK605 | MEL → CMB | May 7, 07:25 UTC | May 8, 05:29 UTC | 22h 5m |
| 2026-05-07 | ALK604 | CMB → MEL | May 7, 03:45 UTC | May 7, 05:05 UTC | 1h 20m |
| 2026-05-05 | ALK607 | SYD → CMB | May 5, 06:40 UTC | May 5, 08:40 UTC | 2h 0m |
| 2026-05-04 | ALK606 | CMB → SYD | May 4, 13:50 UTC | May 5, 05:00 UTC | 15h 11m |
| 2026-05-03 | ALK504 | LHR → CMB | May 3, 21:39 UTC | May 4, 07:40 UTC | 10h 0m |
| 2026-05-03 | ALK503 | CMB → LHR | May 3, 08:35 UTC | May 3, 19:15 UTC | 10h 40m |
| 2026-05-02 | ALK605 | MEL → CMB | May 2, 10:05 UTC | May 3, 08:45 UTC | 22h 39m |
| 2026-05-02 | ALK605 | MEL → CMB | May 2, 06:55 UTC | May 2, 10:40 UTC | 3h 45m |
| 2026-05-01 | ALK604 | CMB → MEL | May 1, 10:05 UTC | May 2, 05:05 UTC | 19h 0m |
| 2026-05-01 | ALK604 | CMB → MEL | May 1, 09:35 UTC | May 2, 05:05 UTC | 19h 30m |
| 2026-05-01 | ALK605 | MEL → CMB | May 1, 06:30 UTC | May 2, 05:05 UTC | 22h 35m |
| 2026-04-30 | ALK604 | CMB → MEL | Apr 30, 11:10 UTC | May 1, 04:30 UTC | 17h 20m |
| 2026-04-30 | ALK604 | CMB → MEL | Apr 30, 04:50 UTC | May 1, 04:00 UTC | 23h 10m |
| 2026-04-29 | ALK501 | CMB → LHR | Apr 29, 14:10 UTC | Apr 30, 03:00 UTC | 12h 49m |
| 2026-04-29 | ALK501 | CMB → LHR | Apr 29, 11:35 UTC | Apr 29, 12:15 UTC | 40m |
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-ALP page for operator, model, and routing details .