Apparatus

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sensors Mode-S transponder

A66935

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N512DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC

Hex
A66935
Octal
51464465
Decimal
10,905,909
Country
US
Tail
N512DN
Type
A359
No current signal · last broadcast 11h ago
Flights observed
223
Distinct callsigns
20
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A66935.

Country allocation

The ICAO 24-bit address A66935 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 20 distinct

Callsign Airline Flights Last seen
DAL389 - 32 2026-07-07
DAL281 - 32 2026-07-09
DAL388 - 23 2026-07-10
DAL275 - 21 2026-07-12
DAL280 - 20 2026-07-08
DAL173 Delta Air Lines 12 2026-06-06
DAL274 - 11 2026-07-13
DAL68 - 10 2026-07-02
DAL197 Delta Air Lines 10 2026-07-02
DAL196 - 10 2026-07-03
DAL172 Delta Air Lines 9 2026-06-05
DAL69 - 7 2026-07-01
DAL136 Delta Air Lines 7 2026-05-31
DAL95 - 5 2026-07-12
DAL137 Delta Air Lines 5 2026-05-31
DAL83 - 2 2026-07-11
DAL82 - 2 2026-07-11
DAL26 Delta Air Lines 2 2026-06-07
DAL96 - 1 2026-07-10
DAL147 Delta Air Lines 1 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL274 HND → DTW Jul 13, 10:10 UTCJul 13, 22:05 UTC11h 55m
2026-07-12 DAL275 DTW → HND Jul 12, 18:16 UTCJul 13, 06:42 UTC12h 26m
2026-07-12 DAL275 - Jul 12, 18:20 UTCJul 13, 06:45 UTC12h 25m
2026-07-12 DAL95 - Jul 12, 07:40 UTCJul 12, 09:15 UTC1h 35m
2026-07-12 DAL95 CDG → DTW Jul 12, 07:37 UTCJul 12, 15:22 UTC7h 45m
2026-07-12 DAL95 CDG → DTW Jul 12, 07:37 UTCJul 12, 15:20 UTC7h 43m
2026-07-11 DAL82 - Jul 11, 20:55 UTCJul 12, 05:01 UTC8h 5m
2026-07-11 DAL83 - Jul 11, 08:15 UTCJul 11, 17:10 UTC8h 55m
2026-07-11 DAL83 CDG → ATL Jul 11, 08:12 UTCJul 11, 17:07 UTC8h 55m
2026-07-10 DAL96 - Jul 10, 21:25 UTCJul 11, 04:20 UTC6h 55m
2026-07-10 DAL388 - Jul 10, 03:05 UTCJul 10, 15:45 UTC12h 40m
2026-07-10 DAL388 PVG → DTW Jul 10, 02:17 UTCJul 10, 15:42 UTC13h 25m
2026-07-09 DAL388 - Jul 9, 09:20 UTCJul 10, 04:50 UTC19h 30m
2026-07-09 DAL281 - Jul 9, 09:00 UTCJul 10, 04:50 UTC19h 50m
2026-07-08 DAL281 - Jul 8, 23:40 UTCJul 9, 10:55 UTC11h 15m
2026-07-08 DAL281 SEA → PVG Jul 8, 23:40 UTCJul 9, 11:40 UTC12h 0m
2026-07-08 DAL280 - Jul 8, 11:00 UTCJul 8, 12:50 UTC1h 50m
2026-07-08 DAL280 - Jul 8, 05:15 UTCJul 8, 20:20 UTC15h 5m
2026-07-07 DAL280 - Jul 7, 23:20 UTCJul 8, 20:20 UTC21h 0m
2026-07-07 DAL280 - Jul 7, 23:00 UTCJul 8, 20:20 UTC21h 20m
2026-07-07 DAL389 - Jul 7, 17:50 UTCJul 8, 06:55 UTC13h 5m
2026-07-07 DAL389 DTW → PVG Jul 7, 17:46 UTCJul 8, 07:43 UTC13h 57m
2026-07-06 DAL274 - Jul 6, 09:35 UTCJul 6, 21:00 UTC11h 25m
2026-07-05 DAL275 - Jul 5, 19:15 UTCJul 6, 07:20 UTC12h 5m
2026-07-05 DAL388 SFO → JFK Jul 5, 03:20 UTCJul 5, 15:35 UTC12h 15m
2026-07-04 DAL388 SFO → JFK Jul 4, 11:20 UTCJul 5, 11:15 UTC23h 55m
2026-07-04 DAL281 - Jul 4, 09:20 UTCJul 5, 09:15 UTC23h 55m
2026-07-03 DAL281 SEA → PVG Jul 3, 23:47 UTCJul 4, 12:12 UTC12h 25m
2026-07-03 DAL281 - Jul 3, 23:50 UTCJul 4, 00:30 UTC40m
2026-07-03 DAL196 ICN → SEA Jul 3, 10:10 UTCJul 3, 19:45 UTC9h 35m
2026-07-03 DAL196 ICN → SEA Jul 3, 10:09 UTCJul 3, 19:39 UTC9h 30m
2026-07-02 DAL197 SEA → ICN Jul 2, 20:25 UTCJul 3, 07:15 UTC10h 50m
2026-07-02 DAL197 SEA → ICN Jul 2, 20:25 UTCJul 3, 07:32 UTC11h 7m
2026-07-02 DAL68 TPE → SEA Jul 2, 01:39 UTCJul 2, 11:55 UTC10h 16m
2026-07-02 DAL68 - Jul 2, 01:40 UTCJul 2, 04:30 UTC2h 50m
2026-07-01 DAL69 SEA → TPE Jul 1, 06:10 UTCJul 1, 18:15 UTC12h 5m
2026-06-30 DAL280 - Jun 30, 11:45 UTCJun 30, 13:30 UTC1h 45m
2026-06-30 DAL280 - Jun 30, 04:45 UTCJun 30, 20:50 UTC16h 5m
2026-06-29 DAL280 - Jun 29, 23:19 UTCJun 30, 20:50 UTC21h 31m
2026-06-29 DAL389 - Jun 29, 22:10 UTCJun 30, 20:50 UTC22h 41m
2026-06-29 DAL389 - Jun 29, 19:20 UTCJun 30, 13:30 UTC18h 11m
2026-06-29 DAL389 DTW → PVG Jun 29, 17:16 UTCJun 30, 07:33 UTC14h 17m
2026-06-29 DAL389 - Jun 29, 17:19 UTCJun 30, 13:30 UTC20h 11m
2026-06-25 DAL274 - Jun 25, 09:50 UTCJun 25, 20:39 UTC10h 50m
2026-06-24 DAL275 - Jun 24, 18:15 UTCJun 25, 06:35 UTC12h 20m
2026-06-24 DAL275 DTW → HND Jun 24, 18:11 UTCJun 25, 06:37 UTC12h 26m
2026-06-24 DAL388 SFO → JFK Jun 24, 02:54 UTCJun 24, 14:55 UTC12h 0m
2026-06-23 DAL388 SFO → JFK Jun 23, 09:20 UTCJun 24, 04:24 UTC19h 5m
2026-06-23 DAL281 - Jun 23, 08:04 UTCJun 24, 04:24 UTC20h 20m
2026-06-23 DAL281 - Jun 23, 03:20 UTCJun 24, 03:15 UTC23h 55m

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 N512DN page for operator, model, and routing details .

Mode-S A66935 frequently asked

What is Mode-S code A66935?
A66935 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N512DN.
Where is Mode-S A66935 registered?
Mode-S code A66935 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 A66935 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A66935, octal 51464465, decimal 10,905,909.
What flights does A66935 operate?
Mode-S A66935 has broadcast 20 distinct callsigns, including DAL389, DAL281, DAL388, DAL275, DAL280.