sensors Mode-S transponder
77044D
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ABM · AIRBUS A-320
- Hex
- 77044D
- Octal
- 35602115
- Decimal
- 7,799,885
- Country
- LK
- Tail
- 4R-ABM
- Type
- A320
- Flights observed
- 81
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 77044D 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 |
|---|---|---|---|
| ALK191 | SriLankan Airlines | 11 | 2026-05-06 |
| ALK192 | SriLankan Airlines | 6 | 2026-05-06 |
| ALK143 | SriLankan Airlines | 6 | 2026-05-20 |
| ALK173 | SriLankan Airlines | 5 | 2026-05-11 |
| ALK144 | SriLankan Airlines | 5 | 2026-05-20 |
| ALK402 | SriLankan Airlines | 4 | 2026-05-28 |
| ALK306 | SriLankan Airlines | 4 | 2026-05-01 |
| ALK195 | SriLankan Airlines | 4 | 2026-04-24 |
| ALK174 | SriLankan Airlines | 4 | 2026-04-22 |
| ALK405 | SriLankan Airlines | 3 | 2026-05-26 |
| ALK404 | SriLankan Airlines | 3 | 2026-05-26 |
| ALK184 | - | 3 | 2026-04-16 |
| ALK183 | SriLankan Airlines | 3 | 2026-04-16 |
| ALK403 | SriLankan Airlines | 2 | 2026-05-29 |
| ALK196 | SriLankan Airlines | 2 | 2026-04-24 |
| ALK152 | SriLankan Airlines | 2 | 2026-04-13 |
| ALK318 | SriLankan Airlines | 1 | 2026-05-27 |
| ALK314 | SriLankan Airlines | 1 | 2026-05-03 |
| ALK308 | SriLankan Airlines | 1 | 2026-05-04 |
| ALK307 | SriLankan Airlines | 1 | 2026-05-02 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | ALK403 | BKK → CMB | May 29, 00:45 UTC | May 29, 01:10 UTC | 25m |
| 2026-05-28 | ALK402 | CMB → BKK | May 28, 22:25 UTC | May 28, 22:55 UTC | 30m |
| 2026-05-28 | ALK402 | CMB → BKK | May 28, 01:20 UTC | May 28, 22:55 UTC | 21h 35m |
| 2026-05-28 | ALK402 | CMB → BKK | May 28, 01:00 UTC | May 28, 22:55 UTC | 21h 55m |
| 2026-05-27 | ALK318 | CMB → KUL | May 27, 22:30 UTC | May 27, 23:00 UTC | 30m |
| 2026-05-26 | ALK405 | BKK → CMB | May 26, 07:15 UTC | May 26, 07:40 UTC | 25m |
| 2026-05-26 | ALK404 | CMB → BKK | May 26, 05:00 UTC | May 26, 05:30 UTC | 30m |
| 2026-05-21 | ALK166 | COK → CMB | May 21, 04:50 UTC | May 21, 05:20 UTC | 30m |
| 2026-05-21 | ALK165 | CMB → COK | May 21, 03:20 UTC | May 21, 03:40 UTC | 20m |
| 2026-05-20 | ALK144 | BOM → CMB | May 20, 16:20 UTC | May 20, 17:20 UTC | 1h 0m |
| 2026-05-20 | ALK144 | BOM → CMB | May 20, 15:35 UTC | May 20, 15:45 UTC | 10m |
| 2026-05-20 | ALK143 | CMB → BOM | May 20, 13:35 UTC | May 20, 14:00 UTC | 25m |
| 2026-05-20 | ALK143 | CMB → BOM | May 20, 12:15 UTC | May 20, 13:00 UTC | 45m |
| 2026-05-18 | ALK405 | BKK → CMB | May 18, 09:35 UTC | May 18, 09:55 UTC | 20m |
| 2026-05-18 | ALK404 | CMB → BKK | May 18, 07:30 UTC | May 18, 08:10 UTC | 40m |
| 2026-05-16 | ALK120 | GAN → CMB | May 16, 11:11 UTC | May 16, 11:21 UTC | 10m |
| 2026-05-15 | ALK405 | BKK → CMB | May 15, 07:35 UTC | May 15, 08:05 UTC | 30m |
| 2026-05-15 | ALK404 | CMB → BKK | May 15, 05:20 UTC | May 15, 05:45 UTC | 25m |
| 2026-05-12 | ALK186 | LHE → CMB | May 12, 13:40 UTC | May 12, 16:45 UTC | 3h 5m |
| 2026-05-11 | ALK185 | CMB → LHE | May 11, 22:05 UTC | May 12, 12:00 UTC | 13h 55m |
| 2026-05-11 | ALK173 | CMB → BLR | May 11, 20:10 UTC | May 11, 20:40 UTC | 30m |
| 2026-05-10 | ALK403 | BKK → CMB | May 10, 01:45 UTC | May 10, 02:10 UTC | 25m |
| 2026-05-09 | ALK402 | CMB → BKK | May 9, 23:55 UTC | May 10, 00:15 UTC | 20m |
| 2026-05-07 | ALK192D | DEL → CMB | May 7, 00:55 UTC | May 7, 16:20 UTC | 15h 25m |
| 2026-05-06 | ALK191 | CMB → DEL | May 6, 11:20 UTC | May 6, 23:35 UTC | 12h 14m |
| 2026-05-06 | ALK191 | CMB → DEL | May 6, 02:15 UTC | May 6, 23:35 UTC | 21h 19m |
| 2026-05-06 | ALK192 | DEL → CMB | May 6, 00:15 UTC | May 6, 23:15 UTC | 22h 59m |
| 2026-05-05 | ALK191 | CMB → DEL | May 5, 13:00 UTC | May 5, 22:20 UTC | 9h 20m |
| 2026-05-04 | ALK308 | CMB → SIN | May 4, 23:55 UTC | May 5, 10:50 UTC | 10h 55m |
| 2026-05-04 | ALK191 | CMB → DEL | May 4, 12:50 UTC | May 4, 22:35 UTC | 9h 46m |
| 2026-05-04 | ALK192 | DEL → CMB | May 4, 00:19 UTC | May 4, 10:35 UTC | 10h 15m |
| 2026-05-03 | ALK191 | CMB → DEL | May 3, 07:35 UTC | May 3, 22:34 UTC | 15h 0m |
| 2026-05-03 | ALK314 | CMB → KUL | May 3, 05:25 UTC | May 3, 05:55 UTC | 30m |
| 2026-05-02 | ALK307 | SIN → CMB | May 2, 02:15 UTC | May 2, 03:00 UTC | 45m |
| 2026-05-01 | ALK306 | CMB → SIN | May 1, 13:50 UTC | May 2, 00:15 UTC | 10h 25m |
| 2026-04-29 | ALK116 | MLE → CMB | Apr 29, 11:05 UTC | Apr 29, 11:15 UTC | 10m |
| 2026-04-28 | ALK192 | DEL → CMB | Apr 28, 00:15 UTC | Apr 28, 10:55 UTC | 10h 40m |
| 2026-04-27 | ALK191 | CMB → DEL | Apr 27, 19:45 UTC | Apr 27, 22:35 UTC | 2h 50m |
| 2026-04-27 | ALK191 | CMB → DEL | Apr 27, 02:10 UTC | Apr 27, 22:35 UTC | 20h 25m |
| 2026-04-26 | ALK306 | CMB → SIN | Apr 26, 23:25 UTC | Apr 27, 00:05 UTC | 40m |
| 2026-04-26 | ALK144 | BOM → CMB | Apr 26, 16:15 UTC | Apr 26, 17:15 UTC | 1h 0m |
| 2026-04-26 | ALK144 | BOM → CMB | Apr 26, 15:25 UTC | Apr 26, 15:35 UTC | 10m |
| 2026-04-26 | ALK143 | CMB → BOM | Apr 26, 13:50 UTC | Apr 26, 14:10 UTC | 20m |
| 2026-04-26 | ALK143 | CMB → BOM | Apr 26, 12:10 UTC | Apr 26, 13:10 UTC | 1h 0m |
| 2026-04-26 | ALK192 | DEL → CMB | Apr 26, 00:40 UTC | Apr 26, 03:15 UTC | 2h 35m |
| 2026-04-25 | ALK191 | CMB → DEL | Apr 25, 20:05 UTC | Apr 25, 22:40 UTC | 2h 35m |
| 2026-04-24 | ALK196 | DEL → CMB | Apr 24, 13:30 UTC | Apr 24, 15:50 UTC | 2h 20m |
| 2026-04-24 | ALK195 | CMB → DEL | Apr 24, 09:35 UTC | Apr 24, 11:50 UTC | 2h 15m |
| 2026-04-23 | ALK195 | CMB → DEL | Apr 23, 16:15 UTC | Apr 24, 11:50 UTC | 19h 34m |
| 2026-04-23 | ALK195 | CMB → DEL | Apr 23, 13:20 UTC | Apr 24, 11:50 UTC | 22h 29m |
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-ABM page for operator, model, and routing details .