sensors Mode-S transponder
040199
ICAO 24-bit transponder address · allocated to Ethiopia
Currently assigned to ET-AYC · BOEING 787-9 Dreamliner
- Hex
- 040199
- Octal
- 01000631
- Decimal
- 262,553
- Country
- ET
- Tail
- ET-AYC
- Type
- B789
- Flights observed
- 215
- Distinct callsigns
- 20
- Country
- ET
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 040199 falls within the block assigned to Ethiopia (ET) by ICAO Annex 10, Volume III. Every aircraft registered in Ethiopia 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 |
|---|---|---|---|
| ETH553 | - | 18 | 2026-07-17 |
| ETH552 | Ethiopian Airlines | 17 | 2026-07-17 |
| ETH729 | - | 8 | 2026-07-12 |
| ETH728 | - | 8 | 2026-07-12 |
| ETH644 | Ethiopian Airlines | 8 | 2026-06-09 |
| ETH730 | Ethiopian Airlines | 7 | 2026-05-19 |
| ETH639 | Ethiopian Airlines | 7 | 2026-05-02 |
| ETH638 | Ethiopian Airlines | 7 | 2026-05-02 |
| ETH629 | Ethiopian Airlines | 7 | 2026-05-31 |
| ETH628 | Ethiopian Airlines | 7 | 2026-05-31 |
| ETH731 | Ethiopian Airlines | 6 | 2026-05-19 |
| ETH519 | Ethiopian Airlines | 6 | 2026-06-16 |
| ETH518 | Ethiopian Airlines | 6 | 2026-06-15 |
| ETH955 | Ethiopian Airlines | 5 | 2026-04-18 |
| ETH846 | - | 5 | 2026-07-13 |
| ETH645 | Ethiopian Airlines | 5 | 2026-06-09 |
| ETH609 | - | 5 | 2026-06-26 |
| ETH738 | - | 4 | 2026-07-04 |
| ETH725 | Ethiopian Airlines | 4 | 2026-05-13 |
| ETH724 | Ethiopian Airlines | 4 | 2026-05-13 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | ETH553 | - | Jul 17, 15:10 UTC | Jul 18, 00:10 UTC | 9h 0m |
| 2026-07-17 | ETH552 | ADD → DUB | Jul 17, 04:04 UTC | Jul 17, 12:35 UTC | 8h 30m |
| 2026-07-16 | ETH552 | ADD → DUB | Jul 16, 09:05 UTC | Jul 17, 02:34 UTC | 17h 30m |
| 2026-07-16 | ETH513 | - | Jul 16, 02:50 UTC | Jul 17, 02:15 UTC | 23h 25m |
| 2026-07-15 | ETH512 | - | Jul 15, 15:35 UTC | Jul 15, 23:30 UTC | 7h 55m |
| 2026-07-14 | ETH727 | - | Jul 14, 22:20 UTC | Jul 15, 16:30 UTC | 18h 9m |
| 2026-07-14 | ETH727 | - | Jul 14, 21:15 UTC | Jul 15, 16:30 UTC | 19h 14m |
| 2026-07-14 | ETH727 | MAN → MRS | Jul 14, 17:40 UTC | Jul 14, 19:20 UTC | 1h 40m |
| 2026-07-14 | ETH726 | - | Jul 14, 05:35 UTC | Jul 14, 07:15 UTC | 1h 40m |
| 2026-07-14 | ETH726 | - | Jul 14, 00:45 UTC | Jul 14, 04:20 UTC | 3h 35m |
| 2026-07-13 | ETH846 | - | Jul 13, 14:05 UTC | Jul 13, 14:25 UTC | 20m |
| 2026-07-12 | ETH729 | GVA → CPT | Jul 12, 20:45 UTC | Jul 13, 12:45 UTC | 16h 0m |
| 2026-07-12 | ETH729 | MAN → GVA | Jul 12, 18:01 UTC | Jul 12, 19:25 UTC | 1h 25m |
| 2026-07-12 | ETH728 | - | Jul 12, 05:50 UTC | Jul 12, 07:15 UTC | 1h 25m |
| 2026-07-12 | ETH728 | - | Jul 12, 01:15 UTC | Jul 12, 04:30 UTC | 3h 15m |
| 2026-07-10 | ETH848 | - | Jul 10, 06:50 UTC | Jul 10, 07:20 UTC | 30m |
| 2026-07-09 | ETH859 | - | Jul 9, 07:15 UTC | Jul 10, 02:15 UTC | 19h 0m |
| 2026-07-09 | ETH823 | - | Jul 9, 00:50 UTC | Jul 9, 14:05 UTC | 13h 15m |
| 2026-07-08 | ETH553 | - | Jul 8, 15:00 UTC | Jul 9, 00:10 UTC | 9h 10m |
| 2026-07-08 | ETH552 | - | Jul 8, 03:50 UTC | Jul 8, 12:15 UTC | 8h 25m |
| 2026-07-07 | ETH552 | - | Jul 7, 13:30 UTC | Jul 8, 01:55 UTC | 12h 25m |
| 2026-07-06 | ETH729 | - | Jul 6, 20:50 UTC | Jul 7, 10:10 UTC | 13h 20m |
| 2026-07-06 | ETH729 | MAN → GVA | Jul 6, 17:45 UTC | Jul 6, 19:05 UTC | 1h 20m |
| 2026-07-06 | ETH728 | GVA → MAN | Jul 6, 05:45 UTC | Jul 6, 07:15 UTC | 1h 30m |
| 2026-07-06 | ETH728 | - | Jul 6, 01:35 UTC | Jul 6, 04:20 UTC | 2h 45m |
| 2026-07-05 | ETH846 | - | Jul 5, 13:50 UTC | Jul 5, 14:00 UTC | 10m |
| 2026-07-04 | ETH739 | GVA → CPT | Jul 4, 19:45 UTC | Jul 5, 12:15 UTC | 16h 30m |
| 2026-07-04 | ETH739 | LYS → GVA | Jul 4, 17:45 UTC | Jul 4, 18:05 UTC | 20m |
| 2026-07-04 | ETH738 | - | Jul 4, 05:40 UTC | Jul 4, 06:05 UTC | 25m |
| 2026-07-03 | ETH738 | - | Jul 3, 14:25 UTC | Jul 4, 04:10 UTC | 13h 45m |
| 2026-07-03 | ETH738 | - | Jul 3, 06:20 UTC | Jul 4, 04:10 UTC | 21h 50m |
| 2026-07-03 | ETH738 | - | Jul 3, 05:35 UTC | Jul 4, 04:10 UTC | 22h 35m |
| 2026-07-02 | ETH712 | - | Jul 2, 13:55 UTC | Jul 3, 03:15 UTC | 13h 20m |
| 2026-07-01 | ETH729 | - | Jul 1, 21:10 UTC | Jul 1, 23:35 UTC | 2h 25m |
| 2026-07-01 | ETH729 | MAN → GVA | Jul 1, 18:25 UTC | Jul 1, 19:45 UTC | 1h 20m |
| 2026-07-01 | ETH728 | GVA → MAN | Jul 1, 05:50 UTC | Jul 1, 07:20 UTC | 1h 30m |
| 2026-06-30 | ETH728 | - | Jun 30, 09:30 UTC | Jul 1, 04:10 UTC | 18h 40m |
| 2026-06-30 | ETH513 | - | Jun 30, 03:25 UTC | Jul 1, 02:15 UTC | 22h 50m |
| 2026-06-29 | ETH512 | - | Jun 29, 15:30 UTC | Jun 29, 23:44 UTC | 8h 15m |
| 2026-06-29 | ETH512 | - | Jun 29, 00:24 UTC | Jun 29, 23:44 UTC | 23h 20m |
| 2026-06-28 | ETH553 | YYZ → ADD | Jun 28, 22:20 UTC | Jun 29, 16:29 UTC | 18h 10m |
| 2026-06-28 | ETH553 | YYZ → ADD | Jun 28, 20:09 UTC | Jun 29, 16:29 UTC | 20h 20m |
| 2026-06-28 | ETH553 | YYZ → ADD | Jun 28, 16:19 UTC | Jun 29, 16:15 UTC | 23h 55m |
| 2026-06-28 | ETH553 | YYZ → ADD | Jun 28, 15:05 UTC | Jun 29, 00:24 UTC | 9h 20m |
| 2026-06-28 | ETH552 | - | Jun 28, 03:55 UTC | Jun 28, 12:19 UTC | 8h 25m |
| 2026-06-28 | ETH552 | - | Jun 28, 00:20 UTC | Jun 28, 02:05 UTC | 1h 45m |
| 2026-06-26 | ETH609 | - | Jun 26, 21:39 UTC | Jun 26, 22:05 UTC | 25m |
| 2026-06-26 | ETH609 | - | Jun 26, 19:04 UTC | Jun 26, 19:30 UTC | 25m |
| 2026-06-26 | ETH609 | - | Jun 26, 16:05 UTC | Jun 26, 17:25 UTC | 1h 20m |
| 2026-06-26 | ETH608 | - | Jun 26, 06:39 UTC | Jun 26, 08:24 UTC | 1h 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 ET-AYC page for operator, model, and routing details .