Apparatus

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sensors Mode-S transponder

A6F9B3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N549DN · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A6F9B3
Octal
51574663
Decimal
10,942,899
Country
US
Tail
N549DN
Type
A21N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
401
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A6F9B3.

Country allocation

The ICAO 24-bit address A6F9B3 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 10 2026-07-24
DAL459 Delta Air Lines 8 2026-06-09
DAL1854 Delta Air Lines 8 2026-07-22
DAL594 Delta Air Lines 7 2026-05-27
DAL486 Delta Air Lines 7 2026-07-26
DAL1859 Delta Air Lines 7 2026-07-22
DAL795 Delta Air Lines 6 2026-04-13
DAL571 Delta Air Lines 6 2026-06-10
DAL440 Delta Air Lines 6 2026-06-19
DAL340 Delta Air Lines 6 2026-07-26
DAL311 - 6 2026-06-16
DAL1961 Delta Air Lines 6 2026-05-11
DAL1780 - 6 2026-06-20
DAL473 - 5 2026-07-15
DAL443 - 5 2026-06-19
DAL428 Delta Air Lines 5 2026-06-08
DAL422 - 5 2026-06-14
DAL394 - 5 2026-06-23
DAL344 - 5 2026-06-22
DAL328 - 5 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2036 BOS → NAS Jul 26, 21:30 UTCJul 26, 22:45 UTC1h 15m
2026-07-26 DAL482 JFK → ATL Jul 26, 14:45 UTCJul 26, 19:20 UTC4h 35m
2026-07-26 DAL486 OGG → SLC Jul 26, 10:45 UTCJul 26, 11:45 UTC1h 0m
2026-07-26 DAL486 OGG → SLC Jul 26, 06:45 UTCJul 26, 06:55 UTC10m
2026-07-26 DAL340 BOS → SEA Jul 26, 03:35 UTCJul 26, 04:00 UTC25m
2026-07-25 DAL340 BOS → SEA Jul 25, 22:20 UTCJul 25, 23:10 UTC50m
2026-07-25 DAL2995 MSP → BWI Jul 25, 17:55 UTCJul 25, 19:35 UTC1h 40m
2026-07-25 DAL1009 JFK → LAS Jul 25, 11:35 UTCJul 25, 15:50 UTC4h 15m
2026-07-25 DAL2038 MKE → ATL Jul 25, 06:10 UTCJul 25, 10:00 UTC3h 50m
2026-07-24 DAL863 JFK → SLC Jul 24, 23:20 UTCJul 25, 04:00 UTC4h 40m
2026-07-24 DAL1966 SAL → LAX Jul 24, 19:55 UTCJul 24, 20:40 UTC45m
2026-07-24 DAL1966 SAL → LAX Jul 24, 17:20 UTCJul 24, 17:40 UTC20m
2026-07-24 DAL1966 SAL → LAX Jul 24, 15:25 UTCJul 24, 15:45 UTC20m
2026-07-24 DAL1966 SAL → LAX Jul 24, 12:35 UTCJul 24, 13:15 UTC40m
2026-07-24 DAL705 MCO → SEA Jul 24, 06:20 UTCJul 24, 10:05 UTC3h 45m
2026-07-24 DAL863 JFK → SLC Jul 24, 00:30 UTCJul 24, 04:55 UTC4h 25m
2026-07-23 DAL1994 JFK → PUJ Jul 23, 13:15 UTCJul 23, 22:15 UTC9h 0m
2026-07-23 DAL1863 SDQ → JFK Jul 23, 03:00 UTCJul 23, 04:15 UTC1h 15m
2026-07-23 DAL1863 SDQ → JFK Jul 23, 00:40 UTCJul 23, 04:09 UTC3h 29m
2026-07-22 DAL1908 JFK → SDQ Jul 22, 18:25 UTCJul 22, 20:55 UTC2h 30m
2026-07-22 DAL1908 JFK → SDQ Jul 22, 18:22 UTCJul 22, 22:29 UTC4h 7m
2026-07-22 DAL1854 SJU → JFK Jul 22, 14:15 UTCJul 22, 15:35 UTC1h 20m
2026-07-22 DAL1854 SJU → JFK Jul 22, 11:50 UTCJul 22, 12:00 UTC10m
2026-07-22 DAL1859 JFK → SJU Jul 22, 03:00 UTCJul 22, 03:35 UTC35m
2026-07-22 DAL1859 JFK → SJU Jul 22, 02:58 UTCJul 22, 06:18 UTC3h 20m
2026-07-21 DAL1957 MBJ → JFK Jul 21, 13:55 UTCJul 22, 00:55 UTC11h 0m
2026-07-21 DAL1668 MCO → JFK Jul 21, 00:45 UTCJul 21, 03:55 UTC3h 10m
2026-07-21 DAL1668 MCO → JFK Jul 21, 00:44 UTCJul 21, 03:48 UTC3h 4m
2026-07-20 DAL867 - Jul 20, 17:45 UTCJul 20, 22:25 UTC4h 40m
2026-07-20 DAL867 LAX → MCO Jul 20, 17:42 UTCJul 20, 22:26 UTC4h 44m
2026-07-20 DAL996 ATL → LAX Jul 20, 12:20 UTCJul 20, 16:05 UTC3h 45m
2026-07-20 DAL302 DEN → ATL Jul 20, 08:05 UTCJul 20, 10:30 UTC2h 25m
2026-07-20 DAL424 JFK → DEN Jul 20, 02:25 UTCJul 20, 06:00 UTC3h 35m
2026-07-19 DAL1829 SDQ → JFK Jul 19, 14:45 UTCJul 19, 23:45 UTC9h 0m
2026-07-18 DAL451 PDX → JFK Jul 18, 14:20 UTCJul 18, 19:35 UTC5h 15m
2026-07-18 DAL451 PDX → JFK Jul 18, 14:16 UTCJul 18, 19:35 UTC5h 19m
2026-07-17 DAL684 JFK → ATL Jul 17, 22:35 UTCJul 18, 04:10 UTC5h 36m
2026-07-17 DAL1792 SLC → JFK Jul 17, 16:19 UTCJul 17, 20:35 UTC4h 15m
2026-07-17 DAL3229 DTW → SLC Jul 17, 11:10 UTCJul 17, 14:15 UTC3h 5m
2026-07-16 DAL708 LAX → DTW Jul 16, 23:05 UTCJul 17, 03:25 UTC4h 20m
2026-07-16 DAL829 SLC → LAX Jul 16, 17:54 UTCJul 16, 19:20 UTC1h 25m
2026-07-16 DAL1117 - Jul 16, 13:40 UTCJul 16, 15:10 UTC1h 30m
2026-07-16 DAL1117 SAN → SLC Jul 16, 13:39 UTCJul 16, 15:10 UTC1h 31m
2026-07-16 DAL1202 SLC → SAN Jul 16, 05:55 UTCJul 16, 07:20 UTC1h 25m
2026-07-16 DAL1210 - Jul 16, 00:20 UTCJul 16, 01:45 UTC1h 25m
2026-07-16 DAL1210 SAN → SLC Jul 16, 00:15 UTCJul 16, 01:44 UTC1h 29m
2026-07-15 DAL1210 SLC → SAN Jul 15, 21:15 UTCJul 15, 22:40 UTC1h 25m
2026-07-15 DAL663 ATL → SLC Jul 15, 16:30 UTCJul 15, 19:40 UTC3h 10m
2026-07-15 DAL663 ATL → SLC Jul 15, 16:28 UTCJul 15, 19:45 UTC3h 17m
2026-07-15 DAL923 BOS → ATL Jul 15, 13:01 UTCJul 15, 15:04 UTC2h 3m

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 N549DN page for operator, model, and routing details .

Mode-S A6F9B3 frequently asked

What is Mode-S code A6F9B3?
A6F9B3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N549DN.
Where is Mode-S A6F9B3 registered?
Mode-S code A6F9B3 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 A6F9B3 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 A6F9B3, octal 51574663, decimal 10,942,899.
What flights does A6F9B3 operate?
Mode-S A6F9B3 has broadcast 20 distinct callsigns, including DAL1966, DAL459, DAL1854, DAL594, DAL486.