sensors Mode-S transponder
04023E
ICAO 24-bit transponder address · allocated to Ethiopia
Currently assigned to ET-BAU · BOEING 737 MAX 8
- Hex
- 04023E
- Octal
- 01001076
- Decimal
- 262,718
- Country
- ET
- Tail
- ET-BAU
- Type
- B38M
- Flights observed
- 41
- Distinct callsigns
- 9
- Country
- ET
- Last broadcast
- 7d ago
Last known position
Country allocation
The ICAO 24-bit address 04023E 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 9 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| SKK076 | - | 10 | 2026-05-18 |
| SKK014 | Skylink Aviation | 10 | 2026-05-19 |
| SKK077 | - | 6 | 2026-05-19 |
| SKK023 | Skylink Aviation | 4 | 2026-05-23 |
| SKK022 | Skylink Aviation | 4 | 2026-05-17 |
| SKK051 | Skylink Aviation | 2 | 2026-05-06 |
| SKK050 | Skylink Aviation | 2 | 2026-05-05 |
| SKK015 | Skylink Aviation | 2 | 2026-05-10 |
| SKK079 | Skylink Aviation | 1 | 2026-05-11 |
Recent flights last 41
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-23 | SKK023 | BJL → FNA | May 23, 06:35 UTC | May 23, 06:50 UTC | 15m |
| 2026-05-19 | SKK014 | CKY → NKC | May 19, 18:30 UTC | May 20, 09:15 UTC | 14h 46m |
| 2026-05-19 | SKK014 | CKY → NKC | May 19, 09:35 UTC | May 20, 09:15 UTC | 23h 41m |
| 2026-05-19 | SKK014 | CKY → NKC | May 19, 09:25 UTC | May 19, 19:15 UTC | 9h 50m |
| 2026-05-19 | SKK077 | - | May 19, 06:35 UTC | May 19, 07:05 UTC | 30m |
| 2026-05-18 | SKK076 | - | May 18, 18:00 UTC | May 18, 18:35 UTC | 34m |
| 2026-05-18 | SKK076 | - | May 18, 16:05 UTC | May 18, 16:45 UTC | 40m |
| 2026-05-17 | SKK022 | FNA → BJL | May 17, 18:10 UTC | May 17, 18:25 UTC | 15m |
| 2026-05-16 | SKK023 | BJL → FNA | May 16, 06:10 UTC | May 16, 06:20 UTC | 10m |
| 2026-05-15 | SKK022 | FNA → BJL | May 15, 18:05 UTC | May 15, 18:20 UTC | 15m |
| 2026-05-11 | SKK079 | NBO → LFW | May 11, 11:20 UTC | May 12, 07:55 UTC | 20h 35m |
| 2026-05-10 | SKK015 | NKC → CKY | May 10, 07:34 UTC | May 10, 15:35 UTC | 8h 0m |
| 2026-05-09 | SKK014 | CKY → NKC | May 9, 17:49 UTC | May 10, 15:35 UTC | 21h 45m |
| 2026-05-06 | SKK051 | DSS → COO | May 6, 07:40 UTC | May 6, 08:15 UTC | 35m |
| 2026-05-05 | SKK050 | LFW → DSS | May 5, 09:10 UTC | May 5, 18:55 UTC | 9h 45m |
| 2026-05-05 | SKK077 | - | May 5, 06:25 UTC | May 5, 06:55 UTC | 30m |
| 2026-05-04 | SKK076 | - | May 4, 18:00 UTC | May 4, 18:30 UTC | 30m |
| 2026-05-04 | SKK076 | - | May 4, 06:20 UTC | May 4, 16:35 UTC | 10h 15m |
| 2026-05-03 | SKK022 | FNA → BJL | May 3, 17:50 UTC | May 3, 18:14 UTC | 25m |
| 2026-04-28 | SKK014 | CKY → NKC | Apr 28, 17:35 UTC | Apr 29, 08:30 UTC | 14h 55m |
| 2026-04-28 | SKK014 | CKY → NKC | Apr 28, 08:45 UTC | Apr 29, 07:29 UTC | 22h 45m |
| 2026-04-27 | SKK077 | - | Apr 27, 17:55 UTC | Apr 28, 06:50 UTC | 12h 55m |
| 2026-04-27 | SKK076 | - | Apr 27, 16:05 UTC | Apr 27, 16:45 UTC | 40m |
| 2026-04-27 | SKK023 | BJL → FNA | Apr 27, 06:35 UTC | Apr 27, 06:45 UTC | 10m |
| 2026-04-26 | SKK051 | DSS → COO | Apr 26, 06:40 UTC | Apr 26, 07:15 UTC | 35m |
| 2026-04-25 | SKK050 | LFW → DSS | Apr 25, 16:35 UTC | Apr 25, 17:10 UTC | 35m |
| 2026-04-21 | SKK014 | CKY → NKC | Apr 21, 17:05 UTC | Apr 22, 08:35 UTC | 15h 30m |
| 2026-04-21 | SKK014 | CKY → NKC | Apr 21, 09:00 UTC | Apr 21, 17:50 UTC | 8h 50m |
| 2026-04-20 | SKK076 | - | Apr 20, 17:35 UTC | Apr 21, 07:00 UTC | 13h 25m |
| 2026-04-20 | SKK076 | - | Apr 20, 15:40 UTC | Apr 20, 16:10 UTC | 30m |
| 2026-04-18 | SKK014 | CKY → NKC | Apr 18, 17:15 UTC | Apr 19, 07:55 UTC | 14h 40m |
| 2026-04-15 | SKK015 | NKC → CKY | Apr 15, 07:25 UTC | Apr 15, 08:05 UTC | 40m |
| 2026-04-14 | SKK014 | - | Apr 14, 17:50 UTC | Apr 14, 18:35 UTC | 45m |
| 2026-04-14 | SKK077 | - | Apr 14, 09:10 UTC | Apr 14, 09:25 UTC | 15m |
| 2026-04-14 | SKK077 | - | Apr 14, 08:45 UTC | Apr 14, 09:05 UTC | 20m |
| 2026-04-14 | SKK077 | - | Apr 14, 06:30 UTC | Apr 14, 07:00 UTC | 30m |
| 2026-04-13 | SKK076 | - | Apr 13, 17:30 UTC | Apr 13, 18:05 UTC | 35m |
| 2026-04-13 | SKK076 | - | Apr 13, 15:50 UTC | Apr 13, 16:20 UTC | 30m |
| 2026-04-13 | SKK076 | - | Apr 13, 15:40 UTC | Apr 13, 16:15 UTC | 35m |
| 2026-04-13 | SKK023 | BJL → FNA | Apr 13, 06:15 UTC | Apr 13, 06:40 UTC | 25m |
| 2026-04-12 | SKK022 | FNA → BJL | Apr 12, 17:45 UTC | Apr 12, 18:10 UTC | 25m |
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-BAU page for operator, model, and routing details .