Apparatus

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sensors Mode-S transponder

040123

ICAO 24-bit transponder address · allocated to Ethiopia

Currently assigned to ET-ATG · BOEING 787-8 Dreamliner

Hex
040123
Octal
01000443
Decimal
262,435
Country
ET
Tail
ET-ATG
Type
B788
No current signal · last broadcast 20h ago
Flights observed
83
Distinct callsigns
20
Country
ET
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S 040123.

Country allocation

The ICAO 24-bit address 040123 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
ETH715 Ethiopian Airlines 14 2026-05-19
ETH714 Ethiopian Airlines 10 2026-05-19
ETH741 Ethiopian Airlines 6 2026-05-26
ETH718 Ethiopian Airlines 5 2026-05-24
ETH740 Ethiopian Airlines 4 2026-05-04
ETH712 Ethiopian Airlines 4 2026-05-21
ETH909 Ethiopian Airlines 3 2026-05-07
ETH731 Ethiopian Airlines 3 2026-04-23
ETH719 Ethiopian Airlines 3 2026-05-25
ETH713 Ethiopian Airlines 3 2026-05-22
ETH515 Ethiopian Airlines 3 2026-05-15
ETH514 Ethiopian Airlines 3 2026-05-14
ETH737 Ethiopian Airlines 2 2026-05-29
ETH736 Ethiopian Airlines 2 2026-05-29
ETH730 Ethiopian Airlines 2 2026-04-23
ETH725 Ethiopian Airlines 2 2026-05-16
ETH724 Ethiopian Airlines 2 2026-05-16
ETH688 Ethiopian Airlines 2 2026-05-27
ETH687 Ethiopian Airlines 2 2026-05-27
ETH601 Ethiopian Airlines 2 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ETH737 MXP → ADD May 29, 21:40 UTCMay 30, 00:00 UTC2h 20m
2026-05-29 ETH737 MXP → ADD May 29, 19:15 UTCMay 29, 19:45 UTC30m
2026-05-29 ETH736 MXP → ZRH May 29, 05:25 UTCMay 29, 06:00 UTC35m
2026-05-29 ETH736 MXP → ZRH May 29, 01:25 UTCMay 29, 04:00 UTC2h 35m
2026-05-27 ETH687 DEL → ADD May 27, 21:20 UTCMay 27, 23:10 UTC1h 50m
2026-05-27 ETH688 ADD → DEL May 27, 00:49 UTCMay 27, 19:15 UTC18h 25m
2026-05-26 ETH741 MAD → ADD May 26, 22:50 UTCMay 27, 19:15 UTC20h 25m
2026-05-26 ETH741 MAD → ADD May 26, 21:34 UTCMay 27, 19:15 UTC21h 40m
2026-05-25 ETH719 LGW → ADD May 25, 09:25 UTCMay 26, 03:19 UTC17h 55m
2026-05-24 ETH718 ADD → LGW May 24, 10:50 UTCMay 25, 05:20 UTC18h 30m
2026-05-24 ETH719 LGW → ADD May 24, 09:50 UTCMay 25, 05:20 UTC19h 30m
2026-05-24 ETH718 ADD → LGW May 24, 01:15 UTCMay 24, 05:25 UTC4h 10m
2026-05-22 ETH713 FCO → ADD May 22, 21:25 UTCMay 23, 00:00 UTC2h 35m
2026-05-21 ETH712 ADD → FCO May 21, 10:45 UTCMay 22, 03:40 UTC16h 55m
2026-05-21 ETH712 ADD → FCO May 21, 04:50 UTCMay 22, 03:40 UTC22h 50m
2026-05-21 ETH517 LFW → ADD May 21, 04:10 UTCMay 22, 02:45 UTC22h 35m
2026-05-20 ETH516 LFW → IAD May 20, 22:20 UTCMay 21, 00:05 UTC1h 45m
2026-05-19 ETH715 ARN → ADD May 19, 20:50 UTCMay 20, 16:15 UTC19h 26m
2026-05-19 ETH715 ARN → ADD May 19, 20:25 UTCMay 20, 16:15 UTC19h 51m
2026-05-19 ETH715 ARN → ADD May 19, 18:10 UTCMay 19, 18:55 UTC45m
2026-05-19 ETH714 ADD → ARN May 19, 05:55 UTCMay 19, 06:45 UTC50m
2026-05-18 ETH714 ADD → ARN May 18, 09:35 UTCMay 19, 04:25 UTC18h 49m
2026-05-17 ETH718 ADD → LGW May 17, 13:40 UTCMay 18, 05:20 UTC15h 40m
2026-05-16 ETH725 VIE → ADD May 16, 20:35 UTCMay 17, 16:45 UTC20h 10m
2026-05-16 ETH725 VIE → ADD May 16, 17:45 UTCMay 16, 19:05 UTC1h 20m
2026-05-16 ETH724 VIE → BRU May 16, 05:35 UTCMay 16, 06:50 UTC1h 16m
2026-05-15 ETH724 VIE → BRU May 15, 08:50 UTCMay 16, 04:20 UTC19h 29m
2026-05-15 ETH515 LFW → ADD May 15, 02:50 UTCMay 16, 02:45 UTC23h 54m
2026-05-15 ETH515 LFW → ADD May 15, 02:30 UTCMay 15, 14:50 UTC12h 19m
2026-05-14 ETH514 LFW → JFK May 14, 15:30 UTCMay 14, 23:45 UTC8h 15m
2026-05-13 ETH715 ARN → ADD May 13, 22:50 UTCMay 14, 22:45 UTC23h 55m
2026-05-13 ETH715 ARN → ADD May 13, 20:50 UTCMay 14, 15:55 UTC19h 5m
2026-05-13 ETH715 ARN → ADD May 13, 20:15 UTCMay 14, 15:55 UTC19h 40m
2026-05-13 ETH715 ARN → ADD May 13, 17:55 UTCMay 13, 18:40 UTC45m
2026-05-13 ETH714 ADD → ARN May 13, 05:55 UTCMay 13, 06:35 UTC40m
2026-05-13 ETH714 ADD → ARN May 13, 00:20 UTCMay 13, 04:35 UTC4h 15m
2026-05-12 ETH714 ADD → ARN May 12, 02:50 UTCMay 13, 02:45 UTC23h 55m
2026-05-11 ETH516 LFW → IAD May 11, 15:10 UTCMay 12, 02:50 UTC11h 41m
2026-05-10 ETH715 ARN → ADD May 10, 20:50 UTCMay 11, 16:05 UTC19h 15m
2026-05-10 ETH715 ARN → ADD May 10, 20:25 UTCMay 11, 16:05 UTC19h 40m
2026-05-10 ETH715 ARN → ADD May 10, 17:55 UTCMay 10, 18:35 UTC40m
2026-05-10 ETH714 ADD → ARN May 10, 06:00 UTCMay 10, 06:45 UTC45m
2026-05-09 ETH714 ADD → ARN May 9, 08:50 UTCMay 10, 04:19 UTC19h 30m
2026-05-09 ETH714 ADD → ARN May 9, 08:30 UTCMay 10, 04:19 UTC19h 50m
2026-05-09 ETH714 ADD → ARN May 9, 02:50 UTCMay 10, 02:45 UTC23h 55m
2026-05-09 ETH515 LFW → ADD May 9, 02:20 UTCMay 10, 00:45 UTC22h 25m
2026-05-08 ETH514 LFW → JFK May 8, 15:15 UTCMay 8, 23:55 UTC8h 40m
2026-05-07 ETH514 LFW → JFK May 7, 21:05 UTCMay 8, 16:05 UTC19h 0m
2026-05-07 ETH909 ADD → BKO May 7, 18:30 UTCMay 7, 19:15 UTC45m
2026-05-06 ETH909 ADD → BKO May 6, 22:50 UTCMay 7, 19:15 UTC20h 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-ATG page for operator, model, and routing details .

Mode-S 040123 frequently asked

What is Mode-S code 040123?
040123 is an ICAO 24-bit transponder address. Allocated to Ethiopia. Assigned to ET-ATG.
Where is Mode-S 040123 registered?
Mode-S code 040123 is allocated to Ethiopia (ET). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 040123 broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 040123, octal 01000443, decimal 262,435.
What flights does 040123 operate?
Mode-S 040123 has broadcast 20 distinct callsigns, including ETH715, ETH714, ETH741, ETH718, ETH740.