Apparatus

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sensors Mode-S transponder

A6DBF3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N541DE · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A6DBF3
Octal
51555763
Decimal
10,935,283
Country
US
Tail
N541DE
Type
A21N
Broadcasting now · callsign DAL506 · 24,800 ft
Flights observed
338
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A6DBF3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6DBF3 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
DAL1966 Delta Air Lines 18 2026-05-04
DAL1961 Delta Air Lines 9 2026-05-15
DAL863 Delta Air Lines 6 2026-05-05
DAL798 Delta Air Lines 6 2026-04-27
DAL705 Delta Air Lines 6 2026-05-13
DAL778 Delta Air Lines 5 2026-05-04
DAL367 Delta Air Lines 5 2026-04-17
DAL2794 Delta Air Lines 5 2026-05-05
DAL1917 Delta Air Lines 5 2026-06-15
DAL1854 Delta Air Lines 5 2026-05-14
DAL1845 Delta Air Lines 5 2026-05-11
DAL1822 - 5 2026-07-10
DAL1780 Delta Air Lines 5 2026-05-28
DAL613 - 4 2026-06-17
DAL612 - 4 2026-06-17
DAL568 Delta Air Lines 4 2026-05-16
DAL424 Delta Air Lines 4 2026-06-16
DAL419 - 4 2026-07-06
DAL400 - 4 2026-07-03
DAL336 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL506 - Jul 14, 15:35 UTCJul 14, 18:45 UTC3h 10m
2026-07-14 DAL485 - Jul 14, 13:25 UTCJul 14, 14:00 UTC35m
2026-07-14 DAL485 - Jul 14, 08:50 UTCJul 14, 09:00 UTC10m
2026-07-14 DAL311 - Jul 14, 07:10 UTCJul 14, 07:20 UTC10m
2026-07-14 DAL311 - Jul 14, 02:05 UTCJul 14, 02:35 UTC30m
2026-07-14 DAL311 LAX → KOA Jul 14, 02:03 UTCJul 14, 07:10 UTC5h 7m
2026-07-12 DAL504 MCO → LAX Jul 12, 14:01 UTCJul 12, 18:25 UTC4h 25m
2026-07-12 DAL448 SEA → MCO Jul 12, 06:35 UTCJul 12, 11:25 UTC4h 50m
2026-07-11 DAL740 JFK → SEA Jul 11, 23:20 UTCJul 12, 04:40 UTC5h 20m
2026-07-11 DAL1406 AUS → JFK Jul 11, 16:30 UTCJul 11, 19:45 UTC3h 15m
2026-07-11 DAL1406 JFK → AUS Jul 11, 11:25 UTCJul 11, 14:50 UTC3h 25m
2026-07-10 DAL1822 JFK → JFK Jul 10, 12:45 UTCJul 10, 23:20 UTC10h 35m
2026-07-10 DAL452 SEA → JFK Jul 10, 05:55 UTCJul 10, 10:35 UTC4h 40m
2026-07-09 DAL786 DCA → SEA Jul 9, 22:20 UTCJul 10, 03:45 UTC5h 25m
2026-07-09 DAL786 SEA → DCA Jul 9, 14:50 UTCJul 9, 19:20 UTC4h 30m
2026-07-09 DAL359 - Jul 9, 04:05 UTCJul 9, 05:05 UTC1h 0m
2026-07-08 DAL359 - Jul 8, 23:30 UTCJul 8, 23:45 UTC15m
2026-07-08 DAL351 - Jul 8, 20:50 UTCJul 8, 21:00 UTC10m
2026-07-08 DAL351 SEA → HNL Jul 8, 15:46 UTCJul 8, 20:53 UTC5h 7m
2026-07-08 DAL351 - Jul 8, 15:50 UTCJul 8, 16:40 UTC50m
2026-07-08 DAL375 - Jul 8, 12:35 UTCJul 8, 13:30 UTC55m
2026-07-08 DAL375 LIH → SEA Jul 8, 07:56 UTCJul 8, 13:30 UTC5h 34m
2026-07-07 DAL428 - Jul 7, 21:50 UTCJul 8, 02:50 UTC5h 0m
2026-07-07 DAL2119 MSP → LAX Jul 7, 16:45 UTCJul 7, 20:10 UTC3h 25m
2026-07-07 DAL1138 BOS → MSP Jul 7, 11:38 UTCJul 7, 14:14 UTC2h 36m
2026-07-07 DAL1138 BOS → MSP Jul 7, 11:40 UTCJul 7, 14:15 UTC2h 35m
2026-07-07 DAL702 SLC → BOS Jul 7, 01:15 UTCJul 7, 05:20 UTC4h 5m
2026-07-06 DAL1209 IAH → LGA Jul 6, 22:20 UTCJul 6, 23:50 UTC1h 30m
2026-07-06 DAL1209 IAH → LGA Jul 6, 19:25 UTCJul 6, 20:50 UTC1h 25m
2026-07-06 DAL1318 - Jul 6, 14:35 UTCJul 6, 15:55 UTC1h 20m
2026-07-06 DAL658 - Jul 6, 12:00 UTCJul 6, 12:30 UTC30m
2026-07-06 DAL658 - Jul 6, 07:50 UTCJul 6, 08:10 UTC20m
2026-07-06 DAL419 - Jul 6, 04:50 UTCJul 6, 05:10 UTC20m
2026-07-05 DAL419 - Jul 5, 23:55 UTCJul 6, 00:45 UTC50m
2026-07-05 DAL1719 JFK → SEA Jul 5, 16:50 UTCJul 5, 22:10 UTC5h 20m
2026-07-05 DAL1829 BNH → JFK Jul 5, 14:25 UTCJul 5, 15:20 UTC55m
2026-07-05 DAL473 SEA → BOS Jul 5, 06:30 UTCJul 5, 11:05 UTC4h 35m
2026-07-04 DAL324 BOS → SEA Jul 4, 23:29 UTCJul 5, 05:08 UTC5h 39m
2026-07-04 DAL324 - Jul 4, 23:30 UTCJul 5, 05:15 UTC5h 45m
2026-07-04 DAL499 MCO → LGA Jul 4, 17:55 UTCJul 4, 21:20 UTC3h 25m
2026-07-04 DAL499 MCO → LGA Jul 4, 12:05 UTCJul 4, 16:05 UTC4h 0m
2026-07-04 DAL571 - Jul 4, 05:20 UTCJul 4, 10:20 UTC5h 0m
2026-07-03 DAL571 - Jul 3, 22:10 UTCJul 4, 03:50 UTC5h 40m
2026-07-03 DAL571 BNH → BOS Jul 3, 21:35 UTCJul 3, 21:40 UTC5m
2026-07-03 DAL400 OAK → BOS Jul 3, 14:20 UTCJul 3, 19:25 UTC5h 5m
2026-07-02 DAL1655 BOS → SFO Jul 2, 22:00 UTCJul 3, 03:50 UTC5h 50m
2026-07-02 DAL400 - Jul 2, 14:30 UTCJul 2, 19:40 UTC5h 10m
2026-07-01 DAL1655 BOS → SFO Jul 1, 21:20 UTCJul 2, 03:25 UTC6h 5m
2026-07-01 DAL400 SFO → BOS Jul 1, 14:25 UTCJul 1, 19:35 UTC5h 10m
2026-06-30 DAL1655 BOS → SFO Jun 30, 21:50 UTCJul 1, 03:55 UTC6h 5m

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 N541DE page for operator, model, and routing details .

Mode-S A6DBF3 frequently asked

What is Mode-S code A6DBF3?
A6DBF3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N541DE.
Where is Mode-S A6DBF3 registered?
Mode-S code A6DBF3 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 A6DBF3 broadcasting right now?
Yes. Mode-S A6DBF3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6DBF3, octal 51555763, decimal 10,935,283.
What flights does A6DBF3 operate?
Mode-S A6DBF3 has broadcast 20 distinct callsigns, including DAL1966, DAL1961, DAL863, DAL798, DAL705.