Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
381
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A6DBF3.

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
DAL419 Delta Air Lines 6 2026-07-25
DAL1993 - 6 2026-07-20
DAL1975 - 6 2026-07-20
DAL1138 Delta Air Lines 6 2026-07-26
DAL1070 - 6 2026-07-16
DAL778 Delta Air Lines 5 2026-05-04
DAL613 Delta Air Lines 5 2026-07-23
DAL612 Delta Air Lines 5 2026-07-23
DAL424 - 5 2026-07-22
DAL367 Delta Air Lines 5 2026-04-17
DAL336 Delta Air Lines 5 2026-07-22
DAL2794 Delta Air Lines 5 2026-05-05
DAL2119 Delta Air Lines 5 2026-07-26
DAL1917 Delta Air Lines 5 2026-06-15
DAL1854 Delta Air Lines 5 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1045 LAX → SEA Jul 26, 22:00 UTCJul 26, 22:45 UTC45m
2026-07-26 DAL2119 MSY → LGA Jul 26, 16:45 UTCJul 26, 20:15 UTC3h 30m
2026-07-26 DAL1138 BOS → RDU Jul 26, 11:25 UTCJul 26, 14:10 UTC2h 45m
2026-07-26 DAL1138 BOS → RDU Jul 26, 11:23 UTCJul 26, 14:08 UTC2h 45m
2026-07-25 DAL2591 DTW → IND Jul 25, 20:55 UTCJul 25, 23:15 UTC2h 20m
2026-07-25 DAL2591 DTW → IND Jul 25, 20:52 UTCJul 25, 23:14 UTC2h 22m
2026-07-25 DAL799 LAX → MSP Jul 25, 16:25 UTCJul 25, 19:35 UTC3h 10m
2026-07-25 DAL658 HNL → LAX Jul 25, 11:35 UTCJul 25, 12:40 UTC1h 5m
2026-07-25 DAL658 HNL → LAX Jul 25, 07:45 UTCJul 25, 08:00 UTC15m
2026-07-25 DAL419 LAX → SFO Jul 25, 04:55 UTCJul 25, 05:10 UTC15m
2026-07-24 DAL419 LAX → SFO Jul 24, 23:35 UTCJul 25, 00:30 UTC55m
2026-07-24 DAL1719 MCO → BOS Jul 24, 16:10 UTCJul 24, 21:35 UTC5h 25m
2026-07-24 DAL1942 SDQ → JFK Jul 24, 12:30 UTCJul 24, 13:30 UTC1h 0m
2026-07-24 DAL1943 JFK → SDQ Jul 24, 01:22 UTCJul 24, 04:39 UTC3h 17m
2026-07-24 DAL1943 JFK → SDQ Jul 24, 01:25 UTCJul 24, 02:05 UTC40m
2026-07-23 DAL612 AUA → JFK Jul 23, 18:20 UTCJul 23, 22:30 UTC4h 10m
2026-07-23 DAL613 JFK → AUA Jul 23, 12:25 UTCJul 23, 16:45 UTC4h 20m
2026-07-22 DAL1855 JFK → STI Jul 22, 21:15 UTCJul 23, 06:30 UTC9h 15m
2026-07-22 DAL336 DFW → LGA Jul 22, 12:50 UTCJul 22, 16:05 UTC3h 15m
2026-07-22 DAL424 - Jul 22, 04:00 UTCJul 22, 05:25 UTC1h 25m
2026-07-21 DAL1829 SDQ → JFK Jul 21, 13:35 UTCJul 22, 02:20 UTC12h 45m
2026-07-21 DAL1969 STI → JFK Jul 21, 07:20 UTCJul 21, 08:05 UTC45m
2026-07-20 DAL1855 JFK → STI Jul 20, 23:34 UTCJul 21, 02:49 UTC3h 15m
2026-07-20 DAL1855 JFK → STI Jul 20, 23:35 UTCJul 21, 00:00 UTC25m
2026-07-20 DAL1993 - Jul 20, 19:45 UTCJul 20, 21:15 UTC1h 30m
2026-07-20 DAL1993 STI → JFK Jul 20, 17:36 UTCJul 20, 21:06 UTC3h 30m
2026-07-20 DAL1975 JFK → STI Jul 20, 02:49 UTCJul 20, 05:53 UTC3h 4m
2026-07-20 DAL1975 - Jul 20, 02:50 UTCJul 20, 03:50 UTC1h 0m
2026-07-19 DAL415 SEA → JFK Jul 19, 19:20 UTCJul 19, 23:45 UTC4h 25m
2026-07-19 DAL2092 - Jul 19, 12:00 UTCJul 19, 17:30 UTC5h 30m
2026-07-19 DAL1114 ATL → LGA Jul 19, 04:40 UTCJul 19, 09:00 UTC4h 20m
2026-07-18 DAL786 DCA → SEA Jul 18, 21:35 UTCJul 19, 02:40 UTC5h 5m
2026-07-18 DAL786 SEA → DCA Jul 18, 14:40 UTCJul 18, 19:50 UTC5h 10m
2026-07-17 DAL344 SEA → SEA Jul 17, 22:20 UTCJul 18, 13:00 UTC14h 41m
2026-07-17 DAL648 ATL → SEA Jul 17, 15:29 UTCJul 17, 19:55 UTC4h 25m
2026-07-16 DAL2045 - Jul 16, 23:49 UTCJul 17, 01:15 UTC1h 25m
2026-07-16 DAL2045 DTW → ATL Jul 16, 23:48 UTCJul 17, 01:11 UTC1h 23m
2026-07-16 DAL1070 - Jul 16, 18:10 UTCJul 16, 21:35 UTC3h 25m
2026-07-16 DAL1070 PHX → DTW Jul 16, 18:06 UTCJul 16, 21:32 UTC3h 26m
2026-07-16 DAL1070 - Jul 16, 12:55 UTCJul 16, 16:25 UTC3h 30m
2026-07-15 DAL1070 PHX → DTW Jul 15, 18:05 UTCJul 15, 21:35 UTC3h 30m
2026-07-15 DAL1070 PHX → DTW Jul 15, 18:03 UTCJul 15, 21:33 UTC3h 30m
2026-07-15 DAL1070 - Jul 15, 13:00 UTCJul 15, 16:20 UTC3h 20m
2026-07-14 DAL506 BFI → DTW Jul 14, 15:35 UTCJul 14, 20:15 UTC4h 40m
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

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?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
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.