Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A63DFF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N501DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC

Hex
A63DFF
Octal
51436777
Decimal
10,894,847
Country
US
Tail
N501DN
Type
A359
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
225
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A63DFF.

Country allocation

The ICAO 24-bit address A63DFF 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
DAL120 - 14 2026-07-18
DAL7 - 13 2026-07-17
DAL171 Delta Air Lines 13 2026-07-21
DAL161 Delta Air Lines 13 2026-07-21
DAL295 Delta Air Lines 11 2026-07-26
DAL166 - 11 2026-07-14
DAL167 - 10 2026-07-14
DAL147 Delta Air Lines 10 2026-07-25
DAL146 Delta Air Lines 9 2026-07-26
DAL196 - 8 2026-07-01
DAL173 Delta Air Lines 8 2026-04-18
DAL8 - 7 2026-07-15
DAL294 Delta Air Lines 7 2026-07-24
DAL172 Delta Air Lines 7 2026-04-17
DAL160 Delta Air Lines 7 2026-07-18
N501DN - 6 2026-07-23
DAL281 - 6 2026-07-02
DAL170 Delta Air Lines 6 2026-07-22
DAL291 - 5 2026-07-16
DAL290 - 5 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL295 ATL → HND Jul 26, 15:45 UTCJul 26, 21:45 UTC6h 0m
2026-07-26 DAL146 SCL → ATL Jul 26, 00:54 UTCJul 26, 09:53 UTC8h 59m
2026-07-25 DAL147 ATL → SCL Jul 25, 02:35 UTCJul 25, 08:30 UTC5h 55m
2026-07-24 DAL294 KIX → GUM Jul 24, 06:35 UTCJul 24, 19:15 UTC12h 40m
2026-07-23 DAL121 LAX → GRU Jul 23, 15:56 UTCJul 24, 03:53 UTC11h 57m
2026-07-23 N501DN MSP → HND Jul 23, 16:00 UTCJul 24, 03:50 UTC11h 50m
2026-07-22 DAL170 ICN → MSP Jul 22, 11:10 UTCJul 22, 22:35 UTC11h 25m
2026-07-21 DAL171 CDG → SLC Jul 21, 18:54 UTCJul 22, 08:28 UTC13h 34m
2026-07-21 DAL171 CDG → SLC Jul 21, 18:55 UTCJul 22, 00:55 UTC6h 0m
2026-07-21 DAL161 AMS → MSP Jul 21, 08:10 UTCJul 21, 16:10 UTC8h 0m
2026-07-21 DAL161 AMS → MSP Jul 21, 08:10 UTCJul 21, 15:45 UTC7h 35m
2026-07-20 DAL132 - Jul 20, 21:55 UTCJul 21, 00:05 UTC2h 10m
2026-07-20 DAL132 DTW → AMS Jul 20, 21:51 UTCJul 21, 05:03 UTC7h 12m
2026-07-20 DAL9969 JFK → ATL Jul 20, 17:40 UTCJul 20, 19:10 UTC1h 30m
2026-07-19 DAL71 AMS → ATL Jul 19, 07:45 UTCJul 19, 16:15 UTC8h 30m
2026-07-18 DAL160 MSP → AMS Jul 18, 21:11 UTCJul 19, 04:44 UTC7h 33m
2026-07-18 DAL160 MSP → AMS Jul 18, 21:15 UTCJul 19, 04:45 UTC7h 30m
2026-07-18 DAL120 - Jul 18, 07:25 UTCJul 18, 18:40 UTC11h 15m
2026-07-18 DAL120 HND → MSP Jul 18, 07:24 UTCJul 18, 18:36 UTC11h 12m
2026-07-17 DAL7 - Jul 17, 17:55 UTCJul 18, 03:45 UTC9h 51m
2026-07-17 DAL7 LAX → HND Jul 17, 17:51 UTCJul 18, 04:17 UTC10h 26m
2026-07-16 DAL291 - Jul 16, 14:29 UTCJul 17, 01:20 UTC10h 50m
2026-07-16 DAL290 LAX → CDG Jul 16, 01:30 UTCJul 16, 11:40 UTC10h 10m
2026-07-15 DAL8 HND → LAX Jul 15, 08:03 UTCJul 15, 18:03 UTC10h 0m
2026-07-15 DAL8 HND → LAX Jul 15, 08:05 UTCJul 15, 18:20 UTC10h 15m
2026-07-14 DAL167 SEA → HND Jul 14, 19:40 UTCJul 15, 04:55 UTC9h 14m
2026-07-14 DAL166 HND → SEA Jul 14, 08:13 UTCJul 14, 17:03 UTC8h 50m
2026-07-14 DAL166 - Jul 14, 08:15 UTCJul 14, 09:00 UTC45m
2026-07-13 DAL167 SEA → HND Jul 13, 19:55 UTCJul 14, 05:50 UTC9h 55m
2026-07-13 DAL166 - Jul 13, 08:25 UTCJul 13, 17:25 UTC9h 0m
2026-07-12 DAL295 - Jul 12, 15:25 UTCJul 13, 04:30 UTC13h 5m
2026-07-12 DAL146 - Jul 12, 05:10 UTCJul 12, 05:45 UTC35m
2026-07-12 DAL146 SCL → ATL Jul 12, 02:38 UTCJul 12, 11:18 UTC8h 40m
2026-07-11 DAL147 - Jul 11, 03:30 UTCJul 11, 09:30 UTC6h 0m
2026-07-10 DAL294 HND → ATL Jul 10, 06:50 UTCJul 10, 19:25 UTC12h 35m
2026-07-09 DAL121 MSP → HND Jul 9, 15:50 UTCJul 10, 03:05 UTC11h 15m
2026-07-07 DAL170 ICN → MSP Jul 7, 10:55 UTCJul 7, 22:40 UTC11h 45m
2026-07-06 DAL171 - Jul 6, 18:55 UTCJul 7, 07:40 UTC12h 45m
2026-07-06 DAL171 MSP → ICN Jul 6, 18:54 UTCJul 7, 07:40 UTC12h 46m
2026-07-06 DAL161 AMS → MSP Jul 6, 08:10 UTCJul 6, 16:10 UTC8h 0m
2026-07-05 DAL70 - Jul 5, 19:50 UTCJul 6, 03:15 UTC7h 25m
2026-07-04 DAL83 - Jul 4, 07:50 UTCJul 4, 16:40 UTC8h 50m
2026-07-03 DAL96 YIP → CDG Jul 3, 21:40 UTCJul 4, 04:25 UTC6h 45m
2026-07-03 DAL388 SFO → JFK Jul 3, 02:26 UTCJul 3, 15:34 UTC13h 8m
2026-07-02 DAL281 - Jul 2, 08:40 UTCJul 3, 04:50 UTC20h 10m
2026-07-02 DAL281 - Jul 2, 03:50 UTCJul 3, 03:45 UTC23h 55m
2026-07-01 DAL281 SEA → PVG Jul 1, 23:47 UTCJul 2, 11:37 UTC11h 50m
2026-07-01 DAL281 - Jul 1, 23:50 UTCJul 2, 04:15 UTC4h 25m
2026-07-01 DAL196 ICN → SEA Jul 1, 10:30 UTCJul 1, 19:40 UTC9h 10m
2026-07-01 DAL196 ICN → SEA Jul 1, 10:28 UTCJul 1, 19:34 UTC9h 6m

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 N501DN page for operator, model, and routing details .

Mode-S A63DFF frequently asked

What is Mode-S code A63DFF?
A63DFF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N501DN.
Where is Mode-S A63DFF registered?
Mode-S code A63DFF 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 A63DFF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A63DFF, octal 51436777, decimal 10,894,847.
What flights does A63DFF operate?
Mode-S A63DFF has broadcast 20 distinct callsigns, including DAL120, DAL7, DAL171, DAL161, DAL295.