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 1h ago
Flights observed
113
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
DAL161 Delta Air Lines 9 2026-05-20
DAL120 Delta Air Lines 9 2026-05-18
DAL173 Delta Air Lines 8 2026-04-18
DAL171 Delta Air Lines 8 2026-05-20
DAL7 Delta Air Lines 7 2026-05-16
DAL172 Delta Air Lines 7 2026-04-17
DAL147 Delta Air Lines 5 2026-05-24
N501DN - 4 2026-05-09
DAL295 Delta Air Lines 4 2026-05-27
DAL167 Delta Air Lines 4 2026-05-17
DAL166 Delta Air Lines 4 2026-05-17
DAL146 Delta Air Lines 4 2026-05-27
DAL8 Delta Air Lines 3 2026-05-28
DAL65 Delta Air Lines 3 2026-05-03
DAL64 Delta Air Lines 3 2026-05-04
DAL294 Delta Air Lines 3 2026-05-23
DAL170 Delta Air Lines 3 2026-05-21
DAL160 Delta Air Lines 3 2026-05-18
DAL1150 Delta Air Lines 3 2026-05-10
DAL69 Delta Air Lines 2 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DAL39 JFK → VCE May 29, 18:50 UTCMay 29, 23:45 UTC4h 55m
2026-05-28 DAL8 HND → LAX May 28, 08:10 UTCMay 28, 17:50 UTC9h 40m
2026-05-27 DAL295 ATL → HND May 27, 15:33 UTCMay 28, 04:57 UTC13h 24m
2026-05-27 DAL295 ATL → HND May 27, 15:35 UTCMay 28, 05:05 UTC13h 30m
2026-05-27 DAL146 SCL → ATL May 27, 07:00 UTCMay 27, 13:00 UTC6h 0m
2026-05-24 DAL147 ATL → SCL May 24, 02:30 UTCMay 24, 08:15 UTC5h 45m
2026-05-23 DAL294 KIX → GUM May 23, 06:40 UTCMay 23, 18:35 UTC11h 56m
2026-05-22 DAL121 LAX → GRU May 22, 15:50 UTCMay 23, 03:35 UTC11h 45m
2026-05-21 DAL170 ICN → MSP May 21, 11:30 UTCMay 21, 22:45 UTC11h 15m
2026-05-21 DAL170 ICN → MSP May 21, 11:30 UTCMay 21, 22:39 UTC11h 9m
2026-05-20 DAL171 CDG → SLC May 20, 19:09 UTCMay 21, 08:49 UTC13h 40m
2026-05-20 DAL171 CDG → SLC May 20, 19:10 UTCMay 21, 01:40 UTC6h 30m
2026-05-20 DAL161 AMS → MSP May 20, 08:35 UTCMay 20, 09:40 UTC1h 5m
2026-05-20 DAL161 AMS → MSP May 20, 08:15 UTCMay 20, 16:18 UTC8h 3m
2026-05-20 DAL161 AMS → MSP May 20, 08:15 UTCMay 20, 16:23 UTC8h 8m
2026-05-20 DAL161 AMS → MSP May 20, 08:15 UTCMay 20, 08:30 UTC15m
2026-05-19 DAL132 DTW → AMS May 19, 20:30 UTCMay 20, 03:25 UTC6h 55m
2026-05-19 DAL133 AMS → DTW May 19, 07:55 UTCMay 19, 15:40 UTC7h 45m
2026-05-18 DAL160 MSP → AMS May 18, 22:15 UTCMay 19, 05:20 UTC7h 5m
2026-05-18 DAL120 HND → MSP May 18, 07:45 UTCMay 18, 08:25 UTC40m
2026-05-18 DAL120 HND → MSP May 18, 07:42 UTCMay 18, 18:19 UTC10h 37m
2026-05-17 DAL167 SEA → HND May 17, 19:40 UTCMay 18, 05:00 UTC9h 20m
2026-05-17 DAL166 HND → SEA May 17, 07:35 UTCMay 17, 15:35 UTC8h 0m
2026-05-17 DAL166 HND → SEA May 17, 07:33 UTCMay 17, 15:32 UTC7h 59m
2026-05-16 DAL7 LAX → HND May 16, 17:30 UTCMay 17, 04:54 UTC11h 24m
2026-05-16 DAL7 LAX → HND May 16, 17:30 UTCMay 17, 04:45 UTC11h 15m
2026-05-15 DAL291 GUM → KIX May 15, 14:40 UTCMay 15, 23:40 UTC8h 59m
2026-05-15 DAL291 GUM → KIX May 15, 14:38 UTCMay 16, 01:42 UTC11h 4m
2026-05-15 DAL290 LAX → CDG May 15, 01:10 UTCMay 15, 11:15 UTC10h 5m
2026-05-15 DAL290 LAX → CDG May 15, 01:10 UTCMay 15, 11:04 UTC9h 54m
2026-05-14 DAL8 HND → LAX May 14, 08:15 UTCMay 14, 17:30 UTC9h 15m
2026-05-13 DAL295 ATL → HND May 13, 16:20 UTCMay 14, 05:35 UTC13h 15m
2026-05-13 DAL146 SCL → ATL May 13, 04:10 UTCMay 13, 10:15 UTC6h 5m
2026-05-13 DAL146 SCL → ATL May 13, 01:20 UTCMay 13, 10:10 UTC8h 50m
2026-05-12 DAL147 ATL → SCL May 12, 02:45 UTCMay 12, 03:45 UTC1h 0m
2026-05-12 DAL147 ATL → SCL May 12, 02:20 UTCMay 12, 11:06 UTC8h 46m
2026-05-10 DAL1150 LGA → DTW May 10, 22:45 UTCMay 10, 23:55 UTC1h 10m
2026-05-10 DAL1150 LGA → DTW May 10, 22:43 UTCMay 10, 23:54 UTC1h 11m
2026-05-10 DAL1150 LGA → DTW May 10, 19:45 UTCMay 10, 21:10 UTC1h 25m
2026-05-09 DAL9957 ATL → ILN May 9, 18:30 UTCMay 9, 20:20 UTC1h 50m
2026-05-09 N501DN MSP → MSP May 9, 17:15 UTCMay 9, 17:20 UTC5m
2026-05-09 N501DN MSP → MSP May 9, 07:10 UTCMay 9, 07:15 UTC5m
2026-05-09 N501DN MSP → MSP May 9, 06:15 UTCMay 9, 06:20 UTC5m
2026-05-08 N501DN MSP → MSP May 8, 09:34 UTCMay 8, 10:09 UTC35m
2026-05-05 DAL120 HND → MSP May 5, 07:40 UTCMay 5, 18:00 UTC10h 20m
2026-05-04 DAL7 LAX → HND May 4, 18:00 UTCMay 5, 05:10 UTC11h 11m
2026-05-04 DAL64 LAS → ATL May 4, 01:20 UTCMay 4, 12:40 UTC11h 20m
2026-05-04 DAL64 LAS → ATL May 4, 01:18 UTCMay 4, 12:29 UTC11h 11m
2026-05-03 DAL65 LAX → AKL May 3, 05:40 UTCMay 3, 19:00 UTC13h 20m
2026-05-02 DAL500 SLC → SEA May 2, 22:55 UTCMay 3, 03:05 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 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 1h ago.
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 DAL161, DAL120, DAL173, DAL171, DAL7.