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
- 196
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- 2h 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 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| ALK503 | - | 37 | 2026-07-14 |
| ALK504 | - | 33 | 2026-07-12 |
| ALK501 | SriLankan Airlines | 21 | 2026-06-07 |
| ALK604 | - | 18 | 2026-06-22 |
| ALK605 | - | 13 | 2026-06-22 |
| ALK606 | SriLankan Airlines | 10 | 2026-06-05 |
| ALK26L | - | 7 | 2026-07-04 |
| ALK101 | - | 7 | 2026-07-09 |
| ALK607 | SriLankan Airlines | 6 | 2026-06-06 |
| ALK89L | - | 5 | 2026-06-30 |
| ALK564 | SriLankan Airlines | 5 | 2026-04-15 |
| ALK266 | - | 5 | 2026-07-02 |
| ALK265 | - | 5 | 2026-07-11 |
| ALK90L | - | 4 | 2026-06-30 |
| ALK563 | SriLankan Airlines | 4 | 2026-04-15 |
| ALK25L | SriLankan Airlines | 4 | 2026-06-30 |
| ALK884 | SriLankan Airlines | 3 | 2026-07-13 |
| ALK471 | SriLankan Airlines | 2 | 2026-04-20 |
| ALK454 | - | 2 | 2026-07-10 |
| ALK102 | SriLankan Airlines | 2 | 2026-04-18 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | ALK503 | - | Jul 14, 08:00 UTC | Jul 14, 08:30 UTC | 30m |
| 2026-07-13 | ALK885 | - | Jul 13, 20:15 UTC | Jul 14, 05:50 UTC | 9h 35m |
| 2026-07-13 | ALK884 | CMB → CAN | Jul 13, 17:25 UTC | Jul 13, 17:40 UTC | 15m |
| 2026-07-12 | ALK504 | - | Jul 12, 21:20 UTC | Jul 13, 15:30 UTC | 18h 10m |
| 2026-07-12 | ALK503 | - | Jul 12, 15:10 UTC | Jul 12, 19:01 UTC | 3h 50m |
| 2026-07-12 | ALK503 | - | Jul 12, 08:10 UTC | Jul 12, 14:35 UTC | 6h 25m |
| 2026-07-11 | ALK265 | - | Jul 11, 13:30 UTC | Jul 12, 00:35 UTC | 11h 5m |
| 2026-07-11 | ALK455 | - | Jul 11, 02:45 UTC | Jul 11, 09:35 UTC | 6h 50m |
| 2026-07-10 | ALK454 | - | Jul 10, 04:05 UTC | Jul 10, 23:20 UTC | 19h 15m |
| 2026-07-10 | ALK454 | - | Jul 10, 01:10 UTC | Jul 10, 23:20 UTC | 22h 10m |
| 2026-07-09 | ALK504 | - | Jul 9, 22:05 UTC | Jul 10, 22:00 UTC | 23h 55m |
| 2026-07-09 | ALK504 | - | Jul 9, 20:55 UTC | Jul 10, 20:00 UTC | 23h 5m |
| 2026-07-09 | ALK503 | - | Jul 9, 08:05 UTC | Jul 9, 19:00 UTC | 10h 55m |
| 2026-07-09 | ALK101 | - | Jul 9, 02:35 UTC | Jul 9, 05:25 UTC | 2h 50m |
| 2026-07-08 | ALK265 | - | Jul 8, 13:15 UTC | Jul 9, 00:40 UTC | 11h 25m |
| 2026-07-07 | ALK504 | - | Jul 7, 20:55 UTC | Jul 8, 06:30 UTC | 9h 35m |
| 2026-07-07 | ALK503 | - | Jul 7, 08:15 UTC | Jul 7, 18:50 UTC | 10h 35m |
| 2026-07-06 | ALK503 | - | Jul 6, 22:05 UTC | Jul 7, 18:50 UTC | 20h 45m |
| 2026-07-06 | ALK503 | - | Jul 6, 21:40 UTC | Jul 7, 18:50 UTC | 21h 10m |
| 2026-07-06 | ALK884 | CMB → CAN | Jul 6, 17:20 UTC | Jul 6, 17:35 UTC | 15m |
| 2026-07-05 | ALK504 | - | Jul 5, 22:05 UTC | Jul 6, 16:50 UTC | 18h 45m |
| 2026-07-05 | ALK504 | - | Jul 5, 21:00 UTC | Jul 6, 16:50 UTC | 19h 50m |
| 2026-07-05 | ALK503 | - | Jul 5, 08:00 UTC | Jul 5, 18:55 UTC | 10h 55m |
| 2026-07-04 | ALK26L | - | Jul 4, 19:35 UTC | Jul 4, 23:15 UTC | 3h 40m |
| 2026-07-03 | ALK504 | - | Jul 3, 21:05 UTC | Jul 4, 17:40 UTC | 20h 35m |
| 2026-07-03 | ALK503 | - | Jul 3, 08:20 UTC | Jul 3, 19:20 UTC | 11h 0m |
| 2026-07-03 | ALK101 | - | Jul 3, 03:20 UTC | Jul 3, 06:20 UTC | 3h 0m |
| 2026-07-02 | ALK266 | - | Jul 2, 14:10 UTC | Jul 3, 01:20 UTC | 11h 10m |
| 2026-07-01 | ALK504 | - | Jul 1, 21:00 UTC | Jul 2, 06:35 UTC | 9h 35m |
| 2026-07-01 | ALK503 | - | Jul 1, 08:00 UTC | Jul 1, 18:45 UTC | 10h 45m |
| 2026-07-01 | ALK101 | - | Jul 1, 02:15 UTC | Jul 1, 02:25 UTC | 10m |
| 2026-06-30 | ALK26L | - | Jun 30, 19:30 UTC | Jun 30, 23:30 UTC | 4h 0m |
| 2026-06-30 | ALK25L | CMB → DXB | Jun 30, 13:40 UTC | Jun 30, 17:20 UTC | 3h 40m |
| 2026-06-30 | ALK90L | - | Jun 30, 07:15 UTC | Jun 30, 08:35 UTC | 1h 20m |
| 2026-06-30 | ALK89L | - | Jun 30, 03:45 UTC | Jun 30, 05:15 UTC | 1h 30m |
| 2026-06-29 | ALK26L | - | Jun 29, 20:09 UTC | Jun 30, 00:04 UTC | 3h 55m |
| 2026-06-29 | ALK25L | CMB → DXB | Jun 29, 14:54 UTC | Jun 29, 18:34 UTC | 3h 40m |
| 2026-06-26 | ALK26L | - | Jun 26, 19:30 UTC | Jun 26, 23:25 UTC | 3h 55m |
| 2026-06-26 | ALK25L | CMB → DXB | Jun 26, 13:34 UTC | Jun 26, 17:19 UTC | 3h 45m |
| 2026-06-25 | ALK504 | - | Jun 25, 20:59 UTC | Jun 26, 06:35 UTC | 9h 35m |
| 2026-06-25 | ALK503 | - | Jun 25, 11:19 UTC | Jun 25, 18:50 UTC | 7h 30m |
| 2026-06-24 | ALK265 | CMB → RUH | Jun 24, 13:20 UTC | Jun 25, 00:24 UTC | 11h 5m |
| 2026-06-23 | ALK504 | - | Jun 23, 21:20 UTC | Jun 24, 07:10 UTC | 9h 50m |
| 2026-06-23 | ALK503 | - | Jun 23, 08:00 UTC | Jun 23, 19:00 UTC | 11h 0m |
| 2026-06-22 | ALK605 | - | Jun 22, 06:25 UTC | Jun 22, 10:34 UTC | 4h 10m |
| 2026-06-22 | ALK604 | - | Jun 22, 03:05 UTC | Jun 22, 04:19 UTC | 1h 15m |
| 2026-06-21 | ALK605 | MEL → MEL | Jun 21, 06:29 UTC | Jun 22, 04:19 UTC | 21h 50m |
| 2026-06-21 | ALK604 | - | Jun 21, 01:45 UTC | Jun 21, 04:30 UTC | 2h 45m |
| 2026-06-20 | ALK604 | - | Jun 20, 08:34 UTC | Jun 21, 04:30 UTC | 19h 55m |
| 2026-06-20 | ALK604 | - | Jun 20, 06:35 UTC | Jun 21, 04:30 UTC | 21h 55m |
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 .