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
Transponder active on ground
Flights observed
181
Distinct callsigns
20
Country
US
Last broadcast
10d 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
DAL160 - 12 2026-07-05
N502DN - 11 2026-06-11
DAL121 - 11 2026-07-16
DAL120 - 11 2026-07-14
DAL147 Delta Air Lines 10 2026-07-18
DAL146 Delta Air Lines 10 2026-07-19
DAL294 - 9 2026-07-17
DAL170 - 9 2026-07-15
DAL161 - 9 2026-06-28
DAL295 - 8 2026-07-19
DAL171 - 8 2026-07-14
DAL133 Delta Air Lines 8 2026-05-27
DAL197 Delta Air Lines 7 2026-07-24
DAL71 - 5 2026-07-07
DAL7 - 5 2026-07-13
DAL69 Delta Air Lines 5 2026-07-26
DAL166 Delta Air Lines 5 2026-07-21
DAL132 Delta Air Lines 5 2026-05-27
DAL68 Delta Air Lines 4 2026-07-24
DAL196 Delta Air Lines 4 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL69 SEA → TPE Jul 26, 00:50 UTCJul 26, 13:10 UTC12h 21m
2026-07-25 DAL196 ICN → SEA Jul 25, 10:15 UTCJul 25, 20:15 UTC10h 0m
2026-07-25 DAL196 ICN → SEA Jul 25, 10:12 UTCJul 25, 20:13 UTC10h 1m
2026-07-24 DAL197 SEA → ICN Jul 24, 20:30 UTCJul 25, 07:05 UTC10h 35m
2026-07-24 DAL68 TPE → SEA Jul 24, 03:30 UTCJul 24, 12:35 UTC9h 5m
2026-07-24 DAL68 TPE → SEA Jul 24, 02:00 UTCJul 24, 02:10 UTC10m
2026-07-23 DAL69 SEA → TPE Jul 23, 11:20 UTCJul 23, 11:40 UTC20m
2026-07-23 DAL69 SEA → TPE Jul 23, 00:10 UTCJul 23, 10:50 UTC10h 40m
2026-07-22 DAL196 ICN → SEA Jul 22, 11:10 UTCJul 22, 20:35 UTC9h 25m
2026-07-21 DAL197 - Jul 21, 20:20 UTCJul 22, 05:25 UTC9h 5m
2026-07-21 DAL197 SEA → ICN Jul 21, 20:19 UTCJul 22, 07:20 UTC11h 1m
2026-07-21 DAL166 HND → SEA Jul 21, 07:40 UTCJul 21, 16:40 UTC9h 0m
2026-07-21 DAL166 HND → SEA Jul 21, 07:39 UTCJul 21, 16:37 UTC8h 58m
2026-07-20 DAL167 SEA → HND Jul 20, 19:25 UTCJul 21, 05:10 UTC9h 44m
2026-07-20 DAL166 HND → SEA Jul 20, 07:45 UTCJul 20, 16:45 UTC9h 0m
2026-07-19 DAL295 - Jul 19, 15:35 UTCJul 20, 04:55 UTC13h 20m
2026-07-19 DAL295 ATL → HND Jul 19, 15:34 UTCJul 20, 04:56 UTC13h 22m
2026-07-19 DAL146 SCL → ATL Jul 19, 03:35 UTCJul 19, 09:30 UTC5h 55m
2026-07-18 DAL147 ATL → SCL Jul 18, 11:10 UTCJul 18, 11:20 UTC10m
2026-07-18 DAL147 ATL → SCL Jul 18, 02:35 UTCJul 18, 08:35 UTC6h 1m
2026-07-17 DAL294 - Jul 17, 19:30 UTCJul 17, 19:40 UTC10m
2026-07-17 DAL294 HND → ATL Jul 17, 06:58 UTCJul 17, 19:13 UTC12h 15m
2026-07-17 DAL294 - Jul 17, 07:00 UTCJul 17, 07:35 UTC35m
2026-07-16 DAL121 MSP → HND Jul 16, 16:06 UTCJul 17, 04:16 UTC12h 10m
2026-07-16 DAL121 MSP → HND Jul 16, 16:09 UTCJul 17, 04:14 UTC12h 5m
2026-07-15 DAL170 ICN → MSP Jul 15, 11:25 UTCJul 15, 23:35 UTC12h 10m
2026-07-14 DAL171 MSP → ICN Jul 14, 20:30 UTCJul 15, 09:10 UTC12h 39m
2026-07-14 DAL120 HND → MSP Jul 14, 07:23 UTCJul 14, 18:18 UTC10h 55m
2026-07-14 DAL120 HND → MSP Jul 14, 07:23 UTCJul 14, 18:16 UTC10h 53m
2026-07-14 DAL120 - Jul 14, 07:25 UTCJul 14, 15:20 UTC7h 55m
2026-07-13 DAL7 LAX → HND Jul 13, 17:50 UTCJul 14, 04:30 UTC10h 40m
2026-07-13 DAL7 LAX → HND Jul 13, 17:48 UTCJul 14, 04:27 UTC10h 39m
2026-07-13 DAL9966 ATL → LAX Jul 13, 03:50 UTCJul 13, 07:34 UTC3h 44m
2026-07-13 DAL9966 - Jul 13, 03:50 UTCJul 13, 07:35 UTC3h 45m
2026-07-09 DAL146 - Jul 9, 04:55 UTCJul 9, 05:45 UTC50m
2026-07-09 DAL146 SCL → ATL Jul 9, 02:06 UTCJul 9, 10:59 UTC8h 53m
2026-07-09 DAL146 SCL → ATL Jul 9, 02:06 UTCJul 9, 10:59 UTC8h 53m
2026-07-08 DAL147 ATL → SCL Jul 8, 02:40 UTCJul 8, 11:29 UTC8h 49m
2026-07-08 DAL147 - Jul 8, 02:40 UTCJul 8, 08:40 UTC6h 0m
2026-07-07 DAL71 AMS → ATL Jul 7, 07:35 UTCJul 7, 16:10 UTC8h 35m
2026-07-07 DAL71 AMS → ATL Jul 7, 07:33 UTCJul 7, 16:05 UTC8h 32m
2026-07-06 DAL70 - Jul 6, 19:55 UTCJul 7, 03:25 UTC7h 30m
2026-07-06 DAL70 ATL → AMS Jul 6, 19:54 UTCJul 7, 03:25 UTC7h 31m
2026-07-06 DAL71 AMS → ATL Jul 6, 07:45 UTCJul 6, 16:30 UTC8h 45m
2026-07-05 DAL160 MSP → AMS Jul 5, 21:11 UTCJul 6, 04:30 UTC7h 19m
2026-07-05 DAL160 - Jul 5, 21:15 UTCJul 6, 04:30 UTC7h 15m
2026-07-05 DAL120 HND → MSP Jul 5, 07:32 UTCJul 5, 18:03 UTC10h 31m
2026-07-05 DAL120 HND → MSP Jul 5, 07:32 UTCJul 5, 18:02 UTC10h 30m
2026-07-05 DAL120 - Jul 5, 07:35 UTCJul 5, 08:15 UTC40m
2026-07-04 DAL167 - Jul 4, 19:30 UTCJul 4, 23:40 UTC4h 10m

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?
Mode-S A641B6 is currently broadcasting from the ground.
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 DAL160, N502DN, DAL121, DAL120, DAL147.