Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A63DF3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N501DA · operated by DELTA AIR LINES INC

Hex
A63DF3
Octal
51436763
Decimal
10,894,835
Country
US
Tail
N501DA
Type
A21N
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
425
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A63DF3.

Country allocation

The ICAO 24-bit address A63DF3 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
DAL356 Delta Air Lines 14 2026-05-05
DAL1966 - 13 2026-06-16
DAL477 Delta Air Lines 12 2026-05-05
DAL694 Delta Air Lines 11 2026-05-05
DAL1917 Delta Air Lines 10 2026-06-12
DAL1672 - 10 2026-07-21
DAL658 Delta Air Lines 9 2026-07-24
DAL419 Delta Air Lines 9 2026-07-24
DAL459 Delta Air Lines 7 2026-05-04
DAL1829 Delta Air Lines 7 2026-06-12
DAL345 Delta Air Lines 6 2026-05-17
DAL336 - 6 2026-06-20
DAL1975 - 6 2026-06-18
DAL1908 - 6 2026-06-20
DAL1432 Delta Air Lines 6 2026-05-04
DAL1045 - 6 2026-07-04
DAL424 Delta Air Lines 5 2026-06-13
DAL347 Delta Air Lines 5 2026-07-25
DAL684 Delta Air Lines 4 2026-05-12
DAL671 Delta Air Lines 4 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL860 LGA → ATL Jul 26, 15:55 UTCJul 26, 21:40 UTC5h 45m
2026-07-25 DAL438 SEA → AUS Jul 25, 20:57 UTCJul 26, 01:40 UTC4h 43m
2026-07-25 DAL438 SEA → AUS Jul 25, 21:00 UTCJul 26, 01:40 UTC4h 40m
2026-07-25 DAL347 HNL → SLC Jul 25, 13:20 UTCJul 25, 18:45 UTC5h 25m
2026-07-25 DAL347 HNL → SLC Jul 25, 13:16 UTCJul 25, 18:39 UTC5h 23m
2026-07-25 DAL1513 BOS → MCO Jul 25, 00:37 UTCJul 25, 03:11 UTC2h 34m
2026-07-25 DAL1513 BOS → MCO Jul 25, 00:40 UTCJul 25, 03:20 UTC2h 40m
2026-07-24 DAL2591 DTW → IND Jul 24, 20:30 UTCJul 24, 22:45 UTC2h 15m
2026-07-24 DAL799 LAX → MSP Jul 24, 15:20 UTCJul 24, 18:25 UTC3h 5m
2026-07-24 DAL658 HNL → LAX Jul 24, 11:30 UTCJul 24, 12:35 UTC1h 5m
2026-07-24 DAL658 HNL → LAX Jul 24, 07:55 UTCJul 24, 08:10 UTC15m
2026-07-24 DAL419 LAX → SFO Jul 24, 04:40 UTCJul 24, 05:00 UTC20m
2026-07-23 DAL419 LAX → SFO Jul 23, 23:20 UTCJul 24, 00:15 UTC55m
2026-07-23 DAL419 LAX → SFO Jul 23, 23:20 UTCJul 24, 04:52 UTC5h 32m
2026-07-23 DAL1719 MCO → BOS Jul 23, 15:55 UTCJul 23, 21:20 UTC5h 25m
2026-07-23 DAL1993 STI → JFK Jul 23, 10:19 UTCJul 23, 13:36 UTC3h 17m
2026-07-23 DAL1993 STI → JFK Jul 23, 03:55 UTCJul 23, 13:40 UTC9h 45m
2026-07-22 DAL671 JFK → SLC Jul 22, 20:45 UTCJul 23, 00:35 UTC3h 50m
2026-07-22 DAL2031 MCO → BOS Jul 22, 15:00 UTCJul 22, 19:00 UTC4h 0m
2026-07-22 DAL2031 MCO → BOS Jul 22, 14:58 UTCJul 22, 18:56 UTC3h 58m
2026-07-22 DAL2555 ATL → GPT Jul 22, 11:25 UTCJul 22, 13:20 UTC1h 55m
2026-07-22 DAL2255 MSP → DTW Jul 22, 00:45 UTCJul 22, 03:45 UTC3h 0m
2026-07-21 DAL2223 ANC → SLC Jul 21, 09:30 UTCJul 21, 13:50 UTC4h 20m
2026-07-21 DAL2713 ATL → MKE Jul 21, 02:40 UTCJul 21, 06:50 UTC4h 10m
2026-07-21 DAL1672 LAS → SLC Jul 21, 00:25 UTCJul 21, 01:20 UTC55m
2026-07-21 DAL1672 LAS → SLC Jul 21, 00:20 UTCJul 21, 01:18 UTC58m
2026-07-20 DAL1672 - Jul 20, 21:40 UTCJul 20, 22:40 UTC1h 0m
2026-07-20 DAL464 - Jul 20, 15:30 UTCJul 20, 20:15 UTC4h 45m
2026-07-20 DAL2436 MCO → BOS Jul 20, 11:10 UTCJul 20, 13:40 UTC2h 30m
2026-07-20 DAL2056 IAH → LAX Jul 20, 00:40 UTCJul 20, 04:35 UTC3h 55m
2026-07-19 DAL1120 JFK → RSW Jul 19, 21:35 UTCJul 19, 23:10 UTC1h 35m
2026-07-19 DAL1120 JFK → RSW Jul 19, 21:34 UTCJul 19, 23:08 UTC1h 34m
2026-07-19 DAL347 HNL → SLC Jul 19, 14:10 UTCJul 19, 19:35 UTC5h 25m
2026-07-19 DAL448 OGG → LAX Jul 19, 06:45 UTCJul 19, 11:35 UTC4h 50m
2026-07-18 DAL347 HNL → SLC Jul 18, 13:25 UTCJul 18, 18:35 UTC5h 10m
2026-07-18 DAL347 HNL → SLC Jul 18, 13:21 UTCJul 18, 18:34 UTC5h 13m
2026-07-17 DAL718 - Jul 17, 23:14 UTCJul 18, 03:55 UTC4h 41m
2026-07-17 DAL2119 MSP → LAX Jul 17, 18:32 UTCJul 17, 21:41 UTC3h 9m
2026-07-17 DAL2119 MSP → LAX Jul 17, 18:34 UTCJul 17, 21:39 UTC3h 5m
2026-07-17 DAL1138 BOS → MSP Jul 17, 11:39 UTCJul 17, 14:18 UTC2h 39m
2026-07-17 DAL1138 BOS → MSP Jul 17, 11:39 UTCJul 17, 14:20 UTC2h 40m
2026-07-16 DAL702 SLC → BOS Jul 16, 23:29 UTCJul 17, 03:30 UTC4h 0m
2026-07-16 DAL1647 LAX → SLC Jul 16, 20:19 UTCJul 16, 21:40 UTC1h 20m
2026-07-16 DAL1647 LAX → SLC Jul 16, 20:16 UTCJul 16, 21:36 UTC1h 20m
2026-07-16 DAL504 MCO → LAX Jul 16, 14:00 UTCJul 16, 18:34 UTC4h 35m
2026-07-15 DAL2056 SLC → MCO Jul 15, 23:40 UTCJul 16, 03:55 UTC4h 15m
2026-07-15 DAL1647 LAX → SLC Jul 15, 20:35 UTCJul 15, 22:00 UTC1h 25m
2026-07-15 DAL504 - Jul 15, 13:55 UTCJul 15, 18:30 UTC4h 35m
2026-07-15 DAL1513 - Jul 15, 02:55 UTCJul 15, 05:15 UTC2h 20m
2026-07-14 DAL438 SEA → BOS Jul 14, 18:40 UTCJul 14, 23:10 UTC4h 29m

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 N501DA page for operator, model, and routing details .

Mode-S A63DF3 frequently asked

What is Mode-S code A63DF3?
A63DF3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N501DA.
Where is Mode-S A63DF3 registered?
Mode-S code A63DF3 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 A63DF3 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 A63DF3, octal 51436763, decimal 10,894,835.
What flights does A63DF3 operate?
Mode-S A63DF3 has broadcast 20 distinct callsigns, including DAL356, DAL1966, DAL477, DAL694, DAL1917.