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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
No current signal · last broadcast Jul 25, 21:55 UTC
Flights observed
234
Distinct callsigns
20
Country
ET
Last broadcast
Jul 25, 21:55 UTC

Last known position

Most recent position reported by Mode-S 040199.

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 - 20 2026-07-17
ETH552 Ethiopian Airlines 17 2026-07-17
ETH730 Ethiopian Airlines 11 2026-07-23
ETH731 Ethiopian Airlines 10 2026-07-23
ETH629 Ethiopian Airlines 10 2026-07-25
ETH628 Ethiopian Airlines 9 2026-07-25
ETH729 - 8 2026-07-12
ETH728 - 8 2026-07-12
ETH644 Ethiopian Airlines 8 2026-06-09
ETH639 Ethiopian Airlines 7 2026-05-02
ETH638 Ethiopian Airlines 7 2026-05-02
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
ETH727 - 5 2026-07-21
ETH645 Ethiopian Airlines 5 2026-06-09
ETH609 - 5 2026-06-26
ETH738 - 4 2026-07-04
ETH726 Ethiopian Airlines 4 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 ETH629 BKK → ADD Jul 25, 21:30 UTCJul 25, 21:55 UTC25m
2026-07-25 ETH629 BKK → ADD Jul 25, 19:05 UTCJul 25, 19:25 UTC20m
2026-07-25 ETH629 BKK → ADD Jul 25, 13:50 UTCJul 25, 16:50 UTC3h 0m
2026-07-25 ETH628 BKK → CGK Jul 25, 08:05 UTCJul 25, 10:55 UTC2h 50m
2026-07-25 ETH628 BKK → CGK Jul 25, 02:45 UTCJul 25, 06:40 UTC3h 55m
2026-07-23 ETH731 DUB → ADD Jul 23, 20:25 UTCJul 23, 23:10 UTC2h 45m
2026-07-23 ETH731 DUB → ADD Jul 23, 17:45 UTCJul 23, 18:40 UTC55m
2026-07-23 ETH730 VIE → BRU Jul 23, 05:35 UTCJul 23, 06:30 UTC55m
2026-07-22 ETH730 VIE → BRU Jul 22, 13:35 UTCJul 23, 04:10 UTC14h 35m
2026-07-21 ETH727 - Jul 21, 21:15 UTCJul 22, 12:15 UTC15h 0m
2026-07-21 ETH727 - Jul 21, 17:55 UTCJul 21, 19:35 UTC1h 40m
2026-07-21 ETH726 MRS → MAN Jul 21, 06:00 UTCJul 21, 07:45 UTC1h 45m
2026-07-20 ETH726 MRS → MAN Jul 20, 12:10 UTCJul 21, 04:05 UTC15h 54m
2026-07-19 ETH731 VIE → CPT Jul 19, 20:40 UTCJul 20, 11:00 UTC14h 20m
2026-07-19 ETH731 - Jul 19, 18:10 UTCJul 19, 19:05 UTC55m
2026-07-19 ETH730 VIE → BRU Jul 19, 05:20 UTCJul 19, 06:10 UTC50m
2026-07-18 ETH730 VIE → BRU Jul 18, 13:35 UTCJul 19, 03:50 UTC14h 15m
2026-07-17 ETH553 - Jul 17, 20:44 UTCJul 18, 12:25 UTC15h 41m
2026-07-17 ETH553 - Jul 17, 16:19 UTCJul 18, 12:25 UTC20h 6m
2026-07-17 ETH553 YYZ → CPT Jul 17, 15:10 UTCJul 18, 12:25 UTC21h 16m
2026-07-17 ETH552 ADD → DUB Jul 17, 04:04 UTCJul 17, 12:35 UTC8h 30m
2026-07-16 ETH552 ADD → DUB Jul 16, 09:05 UTCJul 17, 02:34 UTC17h 30m
2026-07-16 ETH513 - Jul 16, 02:50 UTCJul 17, 02:15 UTC23h 25m
2026-07-15 ETH512 - Jul 15, 15:35 UTCJul 15, 23:30 UTC7h 55m
2026-07-14 ETH727 - Jul 14, 22:20 UTCJul 15, 16:30 UTC18h 9m
2026-07-14 ETH727 - Jul 14, 21:15 UTCJul 15, 16:30 UTC19h 14m
2026-07-14 ETH727 MAN → MRS Jul 14, 17:40 UTCJul 14, 19:20 UTC1h 40m
2026-07-14 ETH726 - Jul 14, 05:35 UTCJul 14, 07:15 UTC1h 40m
2026-07-14 ETH726 - Jul 14, 00:45 UTCJul 14, 04:20 UTC3h 35m
2026-07-13 ETH846 - Jul 13, 14:05 UTCJul 13, 14:25 UTC20m
2026-07-12 ETH729 GVA → CPT Jul 12, 20:45 UTCJul 13, 12:45 UTC16h 0m
2026-07-12 ETH729 MAN → GVA Jul 12, 18:01 UTCJul 12, 19:25 UTC1h 25m
2026-07-12 ETH728 - Jul 12, 05:50 UTCJul 12, 07:15 UTC1h 25m
2026-07-12 ETH728 - Jul 12, 01:15 UTCJul 12, 04:30 UTC3h 15m
2026-07-10 ETH848 - Jul 10, 06:50 UTCJul 10, 07:20 UTC30m
2026-07-09 ETH859 - Jul 9, 07:15 UTCJul 10, 02:15 UTC19h 0m
2026-07-09 ETH823 - Jul 9, 00:50 UTCJul 9, 14:05 UTC13h 15m
2026-07-08 ETH553 - Jul 8, 15:00 UTCJul 9, 00:10 UTC9h 10m
2026-07-08 ETH552 - Jul 8, 03:50 UTCJul 8, 12:15 UTC8h 25m
2026-07-07 ETH552 - Jul 7, 13:30 UTCJul 8, 01:55 UTC12h 25m
2026-07-06 ETH729 - Jul 6, 20:50 UTCJul 7, 10:10 UTC13h 20m
2026-07-06 ETH729 MAN → GVA Jul 6, 17:45 UTCJul 6, 19:05 UTC1h 20m
2026-07-06 ETH728 GVA → MAN Jul 6, 05:45 UTCJul 6, 07:15 UTC1h 30m
2026-07-06 ETH728 - Jul 6, 01:35 UTCJul 6, 04:20 UTC2h 45m
2026-07-05 ETH846 - Jul 5, 13:50 UTCJul 5, 14:00 UTC10m
2026-07-04 ETH739 GVA → CPT Jul 4, 19:45 UTCJul 5, 12:15 UTC16h 30m
2026-07-04 ETH739 LYS → GVA Jul 4, 17:45 UTCJul 4, 18:05 UTC20m
2026-07-04 ETH738 - Jul 4, 05:40 UTCJul 4, 06:05 UTC25m
2026-07-03 ETH738 - Jul 3, 14:25 UTCJul 4, 04:10 UTC13h 45m
2026-07-03 ETH738 - Jul 3, 06:20 UTCJul 4, 04:10 UTC21h 50m

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 .

Mode-S 040199 frequently asked

What is Mode-S code 040199?
040199 is an ICAO 24-bit transponder address. Allocated to Ethiopia. Assigned to ET-AYC.
Where is Mode-S 040199 registered?
Mode-S code 040199 is allocated to Ethiopia (ET). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 040199 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 040199, octal 01000631, decimal 262,553.
What flights does 040199 operate?
Mode-S 040199 has broadcast 20 distinct callsigns, including ETH553, ETH552, ETH730, ETH731, ETH629.