Apparatus

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sensors Mode-S transponder

AD4F04

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N957DS · operated by DELTA STATE UNIVERSITY

Hex
AD4F04
Octal
53247404
Decimal
11,357,956
Country
US
Tail
N957DS
Type
TWEN
No current signal · last broadcast 14h ago
Flights observed
93
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S AD4F04.

Country allocation

The ICAO 24-bit address AD4F04 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 1 distinct

Callsign Airline Flights Last seen
DSU57 - 93 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DSU57 - Jul 13, 19:00 UTCJul 13, 19:45 UTC45m
2026-07-13 DSU57 - Jul 13, 16:25 UTCJul 13, 18:05 UTC1h 40m
2026-07-09 DSU57 - Jul 9, 20:20 UTCJul 9, 20:40 UTC20m
2026-06-26 DSU57 - Jun 26, 16:49 UTCJun 26, 17:54 UTC1h 5m
2026-06-26 DSU57 - Jun 26, 14:29 UTCJun 26, 15:39 UTC1h 10m
2026-06-25 DSU57 - Jun 25, 01:35 UTCJun 25, 01:40 UTC5m
2026-06-25 DSU57 - Jun 25, 00:40 UTCJun 25, 01:30 UTC50m
2026-06-24 DSU57 - Jun 24, 23:29 UTCJun 25, 00:14 UTC45m
2026-06-24 DSU57 - Jun 24, 23:00 UTCJun 24, 23:04 UTC5m
2026-06-22 DSU57 - Jun 22, 20:44 UTCJun 22, 22:05 UTC1h 20m
2026-06-16 DSU57 - Jun 16, 22:40 UTCJun 16, 23:45 UTC1h 5m
2026-06-16 DSU57 - Jun 16, 20:30 UTCJun 16, 21:40 UTC1h 10m
2026-06-16 DSU57 - Jun 16, 18:39 UTCJun 16, 19:19 UTC40m
2026-06-16 DSU57 - Jun 16, 16:39 UTCJun 16, 17:49 UTC1h 10m
2026-06-16 DSU57 - Jun 16, 12:35 UTCJun 16, 13:34 UTC1h 0m
2026-06-16 DSU57 - Jun 16, 00:40 UTCJun 16, 01:40 UTC1h 0m
2026-06-15 DSU57 - Jun 15, 22:35 UTCJun 15, 23:54 UTC1h 20m
2026-06-15 DSU57 - Jun 15, 20:50 UTCJun 15, 21:55 UTC1h 5m
2026-06-15 DSU57 - Jun 15, 18:25 UTCJun 15, 19:20 UTC55m
2026-06-15 DSU57 - Jun 15, 16:30 UTCJun 15, 17:40 UTC1h 10m
2026-06-15 DSU57 - Jun 15, 14:40 UTCJun 15, 15:25 UTC45m
2026-06-04 DSU57 - Jun 4, 16:55 UTCJun 4, 17:55 UTC1h 0m
2026-06-04 DSU57 - Jun 4, 14:40 UTCJun 4, 15:45 UTC1h 5m
2026-06-04 DSU57 - Jun 4, 12:40 UTCJun 4, 13:40 UTC1h 0m
2026-06-03 DSU57 - Jun 3, 22:40 UTCJun 3, 23:35 UTC55m
2026-06-03 DSU57 - Jun 3, 20:45 UTCJun 3, 21:45 UTC1h 0m
2026-06-03 DSU57 - Jun 3, 16:35 UTCJun 3, 17:40 UTC1h 5m
2026-06-01 DSU57 - Jun 1, 22:40 UTCJun 1, 23:45 UTC1h 5m
2026-06-01 DSU57 - Jun 1, 20:50 UTCJun 1, 21:55 UTC1h 5m
2026-06-01 DSU57 - Jun 1, 18:35 UTCJun 1, 19:35 UTC1h 0m
2026-06-01 DSU57 - Jun 1, 17:05 UTCJun 1, 17:30 UTC25m
2026-06-01 DSU57 - Jun 1, 14:45 UTCJun 1, 15:25 UTC40m
2026-05-29 DSU57 - May 29, 22:35 UTCMay 29, 23:35 UTC1h 0m
2026-05-26 DSU57 - May 26, 20:34 UTCMay 26, 21:29 UTC55m
2026-05-25 DSU57 - May 25, 17:55 UTCMay 25, 18:35 UTC40m
2026-05-13 DSU57 - May 13, 15:50 UTCMay 13, 16:10 UTC20m
2026-05-13 DSU57 - May 13, 14:55 UTCMay 13, 15:20 UTC25m
2026-05-13 DSU57 - May 13, 13:31 UTCMay 13, 13:45 UTC15m
2026-05-13 DSU57 - May 13, 12:30 UTCMay 13, 12:55 UTC25m
2026-05-12 DSU57 - May 12, 21:45 UTCMay 12, 22:45 UTC1h 0m
2026-05-12 DSU57 - May 12, 16:45 UTCMay 12, 18:00 UTC1h 15m
2026-05-12 DSU57 - May 12, 14:15 UTCMay 12, 14:35 UTC20m
2026-05-12 DSU57 - May 12, 02:45 UTCMay 12, 03:00 UTC15m
2026-05-11 DSU57 - May 11, 20:30 UTCMay 11, 21:20 UTC50m
2026-05-11 DSU57 - May 11, 13:10 UTCMay 11, 13:50 UTC40m
2026-05-11 DSU57 - May 11, 12:40 UTCMay 11, 13:00 UTC20m
2026-05-08 DSU57 - May 8, 14:50 UTCMay 8, 15:55 UTC1h 5m
2026-05-07 DSU57 - May 7, 12:45 UTCMay 7, 13:45 UTC1h 0m
2026-05-05 DSU57 - May 5, 23:40 UTCMay 6, 00:20 UTC40m
2026-05-05 DSU57 - May 5, 22:35 UTCMay 5, 23:00 UTC25m

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 N957DS page for operator, model, and routing details .

Mode-S AD4F04 frequently asked

What is Mode-S code AD4F04?
AD4F04 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N957DS.
Where is Mode-S AD4F04 registered?
Mode-S code AD4F04 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 AD4F04 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4F04, octal 53247404, decimal 11,357,956.
What flights does AD4F04 operate?
Mode-S AD4F04 has broadcast 1 distinct callsign, including DSU57.