Apparatus

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sensors Mode-S transponder

A058D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N121QS · BOMBARDIER BD-700 Global 5000/5500 · operated by NETJETS SALES INC, AO AIR LLC, CASCABELLES DOS LLC, STIEFEL CHRISTINE EMILY, JPK-NJ LLC, DU CHASTEL MARIE-HELENE

Hex
A058D8
Octal
50054330
Decimal
10,508,504
Country
US
Tail
N121QS
Type
GL5T
No current signal · last broadcast 7h ago
Flights observed
140
Distinct callsigns
2
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A058D8.

Country allocation

The ICAO 24-bit address A058D8 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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 2 distinct

Callsign Airline Flights Last seen
EJA121 - 102 2026-07-13
N121QS - 38 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 EJA121 - Jul 13, 19:00 UTCJul 13, 20:25 UTC1h 25m
2026-07-13 EJA121 - Jul 13, 16:40 UTCJul 13, 17:30 UTC50m
2026-07-13 EJA121 - Jul 13, 12:45 UTCJul 13, 15:15 UTC2h 30m
2026-07-10 EJA121 - Jul 10, 15:35 UTCJul 10, 18:20 UTC2h 45m
2026-07-10 EJA121 - Jul 10, 13:25 UTCJul 10, 13:50 UTC25m
2026-07-09 EJA121 - Jul 9, 14:15 UTCJul 9, 16:30 UTC2h 15m
2026-07-08 N121QS - Jul 8, 17:05 UTCJul 8, 17:25 UTC20m
2026-07-07 N121QS - Jul 7, 08:40 UTCJul 7, 09:35 UTC55m
2026-07-06 N121QS LCY → FAB Jul 6, 08:00 UTCJul 6, 08:50 UTC50m
2026-07-05 N121QS TEB → LCY Jul 5, 13:15 UTCJul 5, 19:25 UTC6h 10m
2026-07-03 EJA121 - Jul 3, 19:10 UTCJul 3, 20:20 UTC1h 10m
2026-07-03 EJA121 - Jul 3, 16:00 UTCJul 3, 17:40 UTC1h 40m
2026-07-03 EJA121 - Jul 3, 13:25 UTCJul 3, 14:30 UTC1h 5m
2026-07-02 EJA121 - Jul 2, 19:20 UTCJul 2, 21:10 UTC1h 50m
2026-07-02 EJA121 - Jul 2, 15:05 UTCJul 2, 17:30 UTC2h 25m
2026-07-01 EJA121 - Jul 1, 18:10 UTCJul 1, 19:30 UTC1h 20m
2026-07-01 EJA121 - Jul 1, 13:55 UTCJul 1, 16:00 UTC2h 5m
2026-07-01 EJA121 - Jul 1, 10:30 UTCJul 1, 12:30 UTC2h 0m
2026-06-19 EJA121 - Jun 19, 21:39 UTCJun 19, 22:24 UTC45m
2026-06-19 EJA121 - Jun 19, 19:04 UTCJun 19, 19:59 UTC55m
2026-06-19 EJA121 - Jun 19, 16:49 UTCJun 19, 17:49 UTC1h 0m
2026-06-19 EJA121 - Jun 19, 14:24 UTCJun 19, 15:14 UTC50m
2026-06-18 N121QS - Jun 18, 14:50 UTCJun 18, 22:35 UTC7h 45m
2026-06-16 N121QS CVG → NHT Jun 16, 11:10 UTCJun 16, 18:20 UTC7h 10m
2026-06-15 EJA121 - Jun 15, 20:50 UTCJun 15, 21:40 UTC50m
2026-06-15 N121QS - Jun 15, 11:00 UTCJun 15, 18:50 UTC7h 50m
2026-06-15 N121QS - Jun 15, 08:04 UTCJun 15, 08:40 UTC35m
2026-06-13 N121QS TEB → LBG Jun 13, 04:05 UTCJun 13, 10:50 UTC6h 45m
2026-06-12 EJA121 MTJ → JAC Jun 12, 20:15 UTCJun 12, 21:05 UTC50m
2026-06-12 EJA121 MTJ → JAC Jun 12, 18:10 UTCJun 12, 19:10 UTC1h 0m
2026-06-12 EJA121 MTJ → JAC Jun 12, 12:50 UTCJun 12, 14:35 UTC1h 45m
2026-06-11 N121QS - Jun 11, 14:05 UTCJun 11, 20:45 UTC6h 40m
2026-06-10 N121QS - Jun 10, 14:30 UTCJun 10, 20:25 UTC5h 55m
2026-06-09 EJA121 MTJ → JAC Jun 9, 20:40 UTCJun 9, 21:20 UTC40m
2026-06-09 EJA121 MTJ → JAC Jun 9, 16:45 UTCJun 9, 19:45 UTC3h 0m
2026-06-04 EJA121 MTJ → JAC Jun 4, 23:55 UTCJun 5, 01:10 UTC1h 15m
2026-06-04 EJA121 MTJ → JAC Jun 4, 21:00 UTCJun 4, 22:55 UTC1h 55m
2026-06-04 EJA121 MTJ → JAC Jun 4, 18:00 UTCJun 4, 19:35 UTC1h 35m
2026-06-04 EJA121 MTJ → JAC Jun 4, 14:45 UTCJun 4, 16:10 UTC1h 25m
2026-05-31 EJA121 MTJ → JAC May 31, 21:55 UTCJun 1, 00:55 UTC3h 0m
2026-05-31 N121QS - May 31, 16:45 UTCMay 31, 20:35 UTC3h 50m
2026-05-31 N121QS - May 31, 00:05 UTCMay 31, 20:35 UTC20h 30m
2026-05-30 N121QS - May 30, 23:55 UTCMay 31, 20:35 UTC20h 40m
2026-05-30 EJA121 MTJ → JAC May 30, 17:55 UTCMay 30, 22:10 UTC4h 15m
2026-05-30 EJA121 MTJ → JAC May 30, 15:45 UTCMay 30, 16:30 UTC45m
2026-05-30 EJA121 MTJ → JAC May 30, 00:00 UTCMay 30, 00:50 UTC50m
2026-05-29 EJA121 MTJ → JAC May 29, 18:10 UTCMay 29, 22:50 UTC4h 40m
2026-05-29 EJA121 MTJ → JAC May 29, 15:55 UTCMay 29, 16:55 UTC1h 0m
2026-05-28 EJA121 MTJ → JAC May 28, 17:25 UTCMay 28, 21:55 UTC4h 30m
2026-05-28 EJA121 MTJ → JAC May 28, 15:10 UTCMay 28, 16:00 UTC50m

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 N121QS page for operator, model, and routing details .

Mode-S A058D8 frequently asked

What is Mode-S code A058D8?
A058D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N121QS.
Where is Mode-S A058D8 registered?
Mode-S code A058D8 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A058D8 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A058D8, octal 50054330, decimal 10,508,504.
What flights does A058D8 operate?
Mode-S A058D8 has broadcast 2 distinct callsigns, including EJA121, N121QS.