Apparatus

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sensors Mode-S transponder

A641B6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N502DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC

Hex
A641B6
Octal
51440666
Decimal
10,895,798
Country
US
Tail
N502DN
Type
A359
No current signal · last broadcast 1h ago
Flights observed
108
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A641B6.

Country allocation

The ICAO 24-bit address A641B6 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
N502DN - 11 2026-06-11
DAL160 - 8 2026-06-15
DAL133 Delta Air Lines 8 2026-05-27
DAL170 Delta Air Lines 7 2026-06-10
DAL161 - 7 2026-06-17
DAL121 - 7 2026-06-19
DAL171 Delta Air Lines 6 2026-05-18
DAL294 - 5 2026-06-20
DAL132 Delta Air Lines 5 2026-05-27
DAL295 Delta Air Lines 4 2026-06-03
DAL197 Delta Air Lines 4 2026-06-09
DAL147 Delta Air Lines 4 2026-06-02
DAL120 - 4 2026-06-15
DAL8 - 3 2026-06-12
DAL7 Delta Air Lines 3 2026-06-14
DAL146 Delta Air Lines 3 2026-06-03
DAL9978 Delta Air Lines 2 2026-05-08
DAL9971 Delta Air Lines 2 2026-04-27
DAL71 - 2 2026-06-16
DAL69 Delta Air Lines 2 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-21 DAL189 - Jun 21, 14:10 UTCJun 21, 17:29 UTC3h 20m
2026-06-20 DAL294 HND → ATL Jun 20, 06:54 UTCJun 20, 19:09 UTC12h 15m
2026-06-19 DAL121 MSP → HND Jun 19, 15:54 UTCJun 20, 03:34 UTC11h 40m
2026-06-17 DAL161 AMS → MSP Jun 17, 08:25 UTCJun 17, 16:15 UTC7h 50m
2026-06-16 DAL70 - Jun 16, 20:05 UTCJun 17, 03:25 UTC7h 20m
2026-06-16 DAL71 AMS → ATL Jun 16, 08:40 UTCJun 16, 17:15 UTC8h 35m
2026-06-16 DAL71 - Jun 16, 08:44 UTCJun 16, 17:15 UTC8h 30m
2026-06-15 DAL160 - Jun 15, 21:09 UTCJun 16, 04:30 UTC7h 20m
2026-06-15 DAL120 - Jun 15, 07:25 UTCJun 15, 17:40 UTC10h 15m
2026-06-14 DAL7 LAX → HND Jun 14, 17:30 UTCJun 14, 23:00 UTC5h 30m
2026-06-14 DAL7 LAX → HND Jun 14, 17:30 UTCJun 15, 04:40 UTC11h 10m
2026-06-13 DAL291 GUM → KIX Jun 13, 14:20 UTCJun 14, 01:05 UTC10h 45m
2026-06-13 DAL290 - Jun 13, 01:15 UTCJun 13, 11:25 UTC10h 9m
2026-06-12 DAL8 - Jun 12, 08:30 UTCJun 12, 17:45 UTC9h 15m
2026-06-11 DAL121 LAX → GRU Jun 11, 16:01 UTCJun 12, 03:43 UTC11h 42m
2026-06-11 N502DN - Jun 11, 16:05 UTCJun 12, 03:30 UTC11h 26m
2026-06-10 DAL170 ICN → MSP Jun 10, 11:00 UTCJun 10, 22:15 UTC11h 15m
2026-06-09 DAL197 SEA → ICN Jun 9, 21:25 UTCJun 10, 01:30 UTC4h 5m
2026-06-09 DAL197 SEA → ICN Jun 9, 21:15 UTCJun 10, 08:55 UTC11h 40m
2026-06-09 DAL68 TPE → SEA Jun 9, 03:50 UTCJun 9, 12:40 UTC8h 50m
2026-06-09 DAL68 TPE → SEA Jun 9, 02:25 UTCJun 9, 02:40 UTC15m
2026-06-08 DAL69 SEA → TPE Jun 8, 12:20 UTCJun 8, 12:40 UTC20m
2026-06-08 DAL69 SEA → TPE Jun 8, 00:00 UTCJun 8, 10:50 UTC10h 50m
2026-06-07 DAL196 ICN → SEA Jun 7, 10:20 UTCJun 7, 19:55 UTC9h 35m
2026-06-06 DAL197 SEA → ICN Jun 6, 20:19 UTCJun 7, 00:19 UTC4h 0m
2026-06-06 DAL197 SEA → ICN Jun 6, 20:15 UTCJun 7, 07:05 UTC10h 50m
2026-06-06 DAL166 HND → SEA Jun 6, 07:55 UTCJun 6, 15:59 UTC8h 5m
2026-06-05 DAL7 LAX → HND Jun 5, 17:30 UTCJun 6, 04:30 UTC11h 0m
2026-06-04 DAL8 HND → LAX Jun 4, 07:58 UTCJun 4, 17:06 UTC9h 8m
2026-06-04 DAL8 HND → LAX Jun 4, 08:00 UTCJun 4, 17:25 UTC9h 25m
2026-06-03 DAL295 ATL → HND Jun 3, 15:45 UTCJun 4, 04:35 UTC12h 50m
2026-06-03 DAL146 SCL → ATL Jun 3, 03:55 UTCJun 3, 10:10 UTC6h 15m
2026-06-02 DAL147 ATL → SCL Jun 2, 02:23 UTCJun 2, 11:11 UTC8h 48m
2026-06-02 DAL147 ATL → SCL Jun 2, 02:25 UTCJun 2, 07:30 UTC5h 5m
2026-06-01 DAL146 SCL → ATL Jun 1, 04:10 UTCJun 1, 10:15 UTC6h 5m
2026-05-30 DAL294 KIX → GUM May 30, 06:40 UTCMay 30, 19:10 UTC12h 30m
2026-05-29 DAL121 LAX → GRU May 29, 15:55 UTCMay 30, 03:30 UTC11h 35m
2026-05-28 DAL161 AMS → MSP May 28, 08:27 UTCMay 28, 16:08 UTC7h 41m
2026-05-28 DAL161 AMS → MSP May 28, 08:27 UTCMay 28, 16:09 UTC7h 42m
2026-05-28 DAL161 AMS → MSP May 28, 08:30 UTCMay 28, 09:30 UTC1h 0m
2026-05-27 DAL132 DTW → AMS May 27, 20:35 UTCMay 28, 03:50 UTC7h 15m
2026-05-27 DAL133 AMS → DTW May 27, 07:40 UTCMay 27, 09:00 UTC1h 20m
2026-05-27 DAL133 AMS → DTW May 27, 07:39 UTCMay 27, 15:31 UTC7h 52m
2026-05-27 DAL133 AMS → DTW May 27, 07:39 UTCMay 27, 15:28 UTC7h 49m
2026-05-26 DAL132 DTW → AMS May 26, 20:29 UTCMay 26, 22:29 UTC2h 0m
2026-05-26 DAL132 DTW → AMS May 26, 20:29 UTCMay 27, 03:44 UTC7h 15m
2026-05-26 DAL133 AMS → DTW May 26, 07:40 UTCMay 26, 09:15 UTC1h 35m
2026-05-26 DAL133 AMS → DTW May 26, 07:36 UTCMay 26, 15:32 UTC7h 56m
2026-05-25 DAL160 MSP → AMS May 25, 21:24 UTCMay 26, 04:45 UTC7h 20m
2026-05-25 DAL120 HND → MSP May 25, 07:52 UTCMay 25, 19:09 UTC11h 17m

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 N502DN page for operator, model, and routing details .

Mode-S A641B6 frequently asked

What is Mode-S code A641B6?
A641B6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N502DN.
Where is Mode-S A641B6 registered?
Mode-S code A641B6 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 A641B6 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A641B6, octal 51440666, decimal 10,895,798.
What flights does A641B6 operate?
Mode-S A641B6 has broadcast 20 distinct callsigns, including N502DN, DAL160, DAL133, DAL170, DAL161.