sensors Mode-S transponder
770454
ICAO 24-bit transponder address · allocated to Sri Lanka
Currently assigned to 4R-ABT · AIRBUS A-320
- Hex
- 770454
- Octal
- 35602124
- Decimal
- 7,799,892
- Country
- LK
- Tail
- 4R-ABT
- Type
- A320
- Flights observed
- 202
- Distinct callsigns
- 20
- Country
- LK
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 770454 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 | - | 18 | 2026-07-09 |
| ALK192 | - | 13 | 2026-07-10 |
| ALK402 | - | 10 | 2026-06-27 |
| ALK308 | - | 10 | 2026-07-06 |
| ALK144 | SriLankan Airlines | 10 | 2026-06-04 |
| ALK403 | - | 9 | 2026-06-29 |
| ALK364 | - | 8 | 2026-06-21 |
| ALK318 | - | 8 | 2026-06-22 |
| ALK309 | SriLankan Airlines | 8 | 2026-06-30 |
| ALK306 | - | 8 | 2026-07-07 |
| ALK143 | SriLankan Airlines | 8 | 2026-06-04 |
| ALK184 | SriLankan Airlines | 7 | 2026-07-14 |
| ALK183 | - | 7 | 2026-07-14 |
| ALK365 | - | 6 | 2026-06-21 |
| ALK314 | - | 6 | 2026-07-12 |
| ALK307 | - | 6 | 2026-07-08 |
| ALK404 | - | 5 | 2026-07-12 |
| ALK319 | - | 5 | 2026-06-19 |
| ALK218 | - | 4 | 2026-07-11 |
| ALK217 | SriLankan Airlines | 4 | 2026-07-11 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-14 | ALK184 | KHI → CMB | Jul 14, 13:30 UTC | Jul 14, 16:00 UTC | 2h 30m |
| 2026-07-14 | ALK183 | - | Jul 14, 00:50 UTC | Jul 14, 11:15 UTC | 10h 25m |
| 2026-07-13 | ALK405 | - | Jul 13, 07:01 UTC | Jul 13, 23:10 UTC | 16h 10m |
| 2026-07-12 | ALK404 | - | Jul 12, 13:55 UTC | Jul 13, 05:20 UTC | 15h 25m |
| 2026-07-12 | ALK315 | - | Jul 12, 07:20 UTC | Jul 13, 05:20 UTC | 22h 0m |
| 2026-07-12 | ALK314 | - | Jul 12, 05:10 UTC | Jul 12, 05:50 UTC | 40m |
| 2026-07-11 | ALK218 | - | Jul 11, 19:25 UTC | Jul 11, 23:45 UTC | 4h 20m |
| 2026-07-11 | ALK217 | CMB → DOH | Jul 11, 10:50 UTC | Jul 11, 17:50 UTC | 7h 0m |
| 2026-07-11 | ALK152 | - | Jul 11, 02:25 UTC | Jul 11, 04:55 UTC | 2h 30m |
| 2026-07-10 | ALK151 | - | Jul 10, 15:55 UTC | Jul 11, 00:10 UTC | 8h 15m |
| 2026-07-10 | ALK171 | CMB → BLR | Jul 10, 14:05 UTC | Jul 10, 14:50 UTC | 45m |
| 2026-07-10 | ALK168 | - | Jul 10, 10:50 UTC | Jul 10, 11:25 UTC | 35m |
| 2026-07-10 | ALK192 | - | Jul 10, 00:30 UTC | Jul 10, 02:45 UTC | 2h 15m |
| 2026-07-09 | ALK191 | - | Jul 9, 20:10 UTC | Jul 9, 22:35 UTC | 2h 25m |
| 2026-07-09 | ALK184 | KHI → CMB | Jul 9, 13:20 UTC | Jul 9, 15:55 UTC | 2h 35m |
| 2026-07-09 | ALK183 | - | Jul 9, 04:40 UTC | Jul 9, 11:10 UTC | 6h 30m |
| 2026-07-08 | ALK1173 | - | Jul 8, 21:55 UTC | Jul 9, 03:15 UTC | 5h 20m |
| 2026-07-08 | ALK307 | - | Jul 8, 02:10 UTC | Jul 8, 20:30 UTC | 18h 20m |
| 2026-07-07 | ALK306 | - | Jul 7, 13:35 UTC | Jul 8, 00:40 UTC | 11h 5m |
| 2026-07-07 | ALK195 | - | Jul 7, 02:40 UTC | Jul 7, 12:00 UTC | 9h 20m |
| 2026-07-06 | ALK306 | - | Jul 6, 12:30 UTC | Jul 7, 00:10 UTC | 11h 40m |
| 2026-07-06 | ALK308 | - | Jul 6, 01:00 UTC | Jul 6, 10:45 UTC | 9h 45m |
| 2026-07-05 | ALK405 | - | Jul 5, 07:00 UTC | Jul 5, 22:55 UTC | 15h 55m |
| 2026-07-05 | ALK404 | - | Jul 5, 05:05 UTC | Jul 5, 05:30 UTC | 25m |
| 2026-07-04 | ALK218 | - | Jul 4, 19:30 UTC | Jul 4, 23:45 UTC | 4h 15m |
| 2026-07-04 | ALK217 | CMB → DOH | Jul 4, 13:30 UTC | Jul 4, 17:50 UTC | 4h 20m |
| 2026-07-04 | ALK166 | - | Jul 4, 06:20 UTC | Jul 4, 06:50 UTC | 30m |
| 2026-07-04 | ALK192 | - | Jul 4, 00:10 UTC | Jul 4, 05:20 UTC | 5h 10m |
| 2026-07-03 | ALK191 | - | Jul 3, 13:55 UTC | Jul 3, 22:30 UTC | 8h 35m |
| 2026-07-03 | ALK405 | - | Jul 3, 07:40 UTC | Jul 3, 12:50 UTC | 5h 10m |
| 2026-07-03 | ALK404 | - | Jul 3, 05:25 UTC | Jul 3, 05:50 UTC | 25m |
| 2026-07-02 | ALK218 | - | Jul 2, 19:35 UTC | Jul 2, 23:50 UTC | 4h 15m |
| 2026-07-02 | ALK217 | CMB → DOH | Jul 2, 07:25 UTC | Jul 2, 17:50 UTC | 10h 25m |
| 2026-07-01 | ALK314 | - | Jul 1, 22:05 UTC | Jul 2, 05:50 UTC | 7h 45m |
| 2026-07-01 | ALK307 | - | Jul 1, 02:20 UTC | Jul 1, 20:35 UTC | 18h 15m |
| 2026-06-30 | ALK309 | SIN → CMB | Jun 30, 12:35 UTC | Jul 1, 00:25 UTC | 11h 50m |
| 2026-06-30 | ALK308 | - | Jun 30, 00:00 UTC | Jun 30, 11:00 UTC | 11h 1m |
| 2026-06-29 | ALK191 | - | Jun 29, 12:34 UTC | Jun 29, 22:30 UTC | 9h 55m |
| 2026-06-29 | ALK403 | - | Jun 29, 00:49 UTC | Jun 29, 10:59 UTC | 10h 10m |
| 2026-06-28 | ALK196 | - | Jun 28, 13:29 UTC | Jun 28, 22:59 UTC | 9h 30m |
| 2026-06-28 | ALK403 | - | Jun 28, 01:04 UTC | Jun 28, 11:55 UTC | 10h 50m |
| 2026-06-27 | ALK402 | - | Jun 27, 23:04 UTC | Jun 27, 23:34 UTC | 30m |
| 2026-06-27 | ALK403 | - | Jun 27, 00:44 UTC | Jun 27, 11:14 UTC | 10h 30m |
| 2026-06-26 | ALK402 | - | Jun 26, 22:19 UTC | Jun 26, 22:49 UTC | 30m |
| 2026-06-26 | ALK403 | - | Jun 26, 00:45 UTC | Jun 26, 16:14 UTC | 15h 30m |
| 2026-06-25 | ALK402 | - | Jun 25, 22:34 UTC | Jun 25, 23:09 UTC | 35m |
| 2026-06-25 | ALK184 | KHI → CMB | Jun 25, 13:09 UTC | Jun 25, 15:44 UTC | 2h 35m |
| 2026-06-25 | ALK183 | - | Jun 25, 09:05 UTC | Jun 25, 11:15 UTC | 2h 10m |
| 2026-06-25 | ALK161 | - | Jun 25, 03:04 UTC | Jun 25, 03:24 UTC | 20m |
| 2026-06-24 | ALK403 | - | Jun 24, 00:49 UTC | Jun 24, 16:34 UTC | 15h 45m |
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-ABT page for operator, model, and routing details .