Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6BBEF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N533DT · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A6BBEF
Octal
51535757
Decimal
10,927,087
Country
US
Tail
N533DT
Type
A21N
No current signal · last broadcast 10d ago
Flights observed
363
Distinct callsigns
20
Country
US
Last broadcast
10d ago

Last known position

Most recent position reported by Mode-S A6BBEF.

Country allocation

The ICAO 24-bit address A6BBEF 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
DAL1780 Delta Air Lines 11 2026-05-27
DAL506 - 8 2026-06-17
DAL443 Delta Air Lines 7 2026-06-05
DAL440 Delta Air Lines 7 2026-05-23
DAL422 Delta Air Lines 7 2026-06-05
DAL2225 Delta Air Lines 7 2026-04-18
DAL1715 Delta Air Lines 7 2026-05-03
DAL473 Delta Air Lines 6 2026-05-27
DAL344 - 6 2026-06-16
DAL311 - 6 2026-06-22
DAL2103 Delta Air Lines 6 2026-04-19
DAL612 - 5 2026-06-27
DAL485 Delta Air Lines 5 2026-05-04
DAL428 - 5 2026-06-14
DAL394 - 5 2026-06-17
DAL359 Delta Air Lines 5 2026-05-20
DAL905 - 4 2026-06-16
DAL885 Delta Air Lines 4 2026-06-03
DAL865 - 4 2026-06-20
DAL792 - 4 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-04 DAL562 SEA → ATL Jul 4, 14:55 UTCJul 4, 19:40 UTC4h 45m
2026-07-03 DAL2995 SLC → SEA Jul 3, 17:50 UTCJul 3, 19:35 UTC1h 45m
2026-07-03 DAL1318 - Jul 3, 14:30 UTCJul 3, 15:55 UTC1h 25m
2026-07-02 DAL382 - Jul 2, 21:40 UTCJul 3, 02:15 UTC4h 35m
2026-07-02 DAL2032 SDF → ATL Jul 2, 15:50 UTCJul 2, 19:50 UTC4h 0m
2026-07-02 DAL1128 JFK → PBI Jul 2, 12:40 UTCJul 2, 14:05 UTC1h 25m
2026-07-01 DAL740 JFK → SEA Jul 1, 22:15 UTCJul 2, 03:40 UTC5h 25m
2026-07-01 DAL1792 SLC → AVP Jul 1, 16:15 UTCJul 1, 19:45 UTC3h 30m
2026-07-01 DAL1792 SLC → JFK Jul 1, 16:15 UTCJul 1, 20:17 UTC4h 2m
2026-07-01 DAL3229 FLL → MSP Jul 1, 11:15 UTCJul 1, 14:40 UTC3h 25m
2026-07-01 DAL2255 - Jul 1, 01:45 UTCJul 1, 04:35 UTC2h 50m
2026-06-30 DAL526 ATL → SLC Jun 30, 19:45 UTCJun 30, 23:10 UTC3h 25m
2026-06-30 DAL897 SJC → ATL Jun 30, 14:20 UTCJun 30, 15:45 UTC1h 25m
2026-06-30 DAL897 SJC → ATL Jun 30, 14:20 UTCJun 30, 17:39 UTC3h 19m
2026-06-30 DAL1210 - Jun 30, 00:35 UTCJun 30, 01:55 UTC1h 21m
2026-06-29 DAL1210 SLC → SAN Jun 29, 21:39 UTCJun 29, 23:14 UTC1h 35m
2026-06-29 DAL464 BOS → SLC Jun 29, 15:30 UTCJun 29, 20:19 UTC4h 50m
2026-06-29 DAL2436 SEA → CVG Jun 29, 11:10 UTCJun 29, 13:34 UTC2h 25m
2026-06-28 DAL1685 - Jun 28, 22:10 UTCJun 29, 00:14 UTC2h 5m
2026-06-28 DAL2049 MCO → JFK Jun 28, 17:39 UTCJun 28, 19:45 UTC2h 6m
2026-06-28 DAL2049 MCO → JFK Jun 28, 17:39 UTCJun 28, 19:49 UTC2h 10m
2026-06-28 DAL2049 JFK → MCO Jun 28, 12:25 UTCJun 28, 14:30 UTC2h 5m
2026-06-27 DAL612 - Jun 27, 23:14 UTCJun 28, 00:30 UTC1h 15m
2026-06-27 DAL612 - Jun 27, 17:59 UTCJun 27, 21:55 UTC3h 55m
2026-06-27 DAL613 JFK → AUA Jun 27, 11:56 UTCJun 27, 16:03 UTC4h 7m
2026-06-27 DAL1961 - Jun 27, 00:55 UTCJun 27, 01:39 UTC45m
2026-06-26 DAL1961 - Jun 26, 22:14 UTCJun 26, 22:25 UTC10m
2026-06-26 DAL1961 - Jun 26, 20:29 UTCJun 26, 20:50 UTC20m
2026-06-26 DAL1961 - Jun 26, 17:19 UTCJun 26, 18:15 UTC55m
2026-06-26 DAL1854 - Jun 26, 13:49 UTCJun 26, 14:50 UTC1h 0m
2026-06-26 DAL1854 - Jun 26, 11:14 UTCJun 26, 11:30 UTC15m
2026-06-26 DAL1854 SJU → JFK Jun 26, 11:13 UTCJun 26, 14:43 UTC3h 30m
2026-06-26 DAL1859 - Jun 26, 03:20 UTCJun 26, 03:39 UTC20m
2026-06-26 DAL1859 - Jun 26, 00:20 UTCJun 26, 00:55 UTC35m
2026-06-25 DAL1955 JFK → JFK Jun 25, 13:00 UTCJun 25, 21:25 UTC8h 25m
2026-06-25 DAL1969 STI → JFK Jun 25, 02:16 UTCJun 25, 05:18 UTC3h 2m
2026-06-24 DAL1969 JFK → JFK Jun 24, 22:00 UTCJun 25, 05:25 UTC7h 25m
2026-06-24 DAL546 PHX → JFK Jun 24, 13:05 UTCJun 24, 17:20 UTC4h 15m
2026-06-23 DAL798 JFK → PHX Jun 23, 23:10 UTCJun 24, 03:55 UTC4h 45m
2026-06-23 DAL1966 - Jun 23, 20:19 UTCJun 23, 20:54 UTC35m
2026-06-23 DAL1966 - Jun 23, 17:34 UTCJun 23, 17:50 UTC15m
2026-06-23 DAL1966 - Jun 23, 15:19 UTCJun 23, 15:44 UTC25m
2026-06-23 DAL1966 - Jun 23, 12:25 UTCJun 23, 12:49 UTC25m
2026-06-23 DAL1668 MCO → BOS Jun 23, 02:40 UTCJun 23, 06:04 UTC3h 25m
2026-06-22 DAL867 - Jun 22, 20:39 UTCJun 23, 01:15 UTC4h 35m
2026-06-22 DAL486 - Jun 22, 12:10 UTCJun 22, 12:54 UTC45m
2026-06-22 DAL486 - Jun 22, 07:54 UTCJun 22, 08:04 UTC10m
2026-06-22 DAL311 - Jun 22, 05:04 UTCJun 22, 05:10 UTC5m
2026-06-22 DAL311 - Jun 22, 00:04 UTCJun 22, 00:34 UTC30m
2026-06-21 DAL2914 SEA → LAX Jun 21, 19:55 UTCJun 21, 22:10 UTC2h 15m

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 N533DT page for operator, model, and routing details .

Mode-S A6BBEF frequently asked

What is Mode-S code A6BBEF?
A6BBEF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N533DT.
Where is Mode-S A6BBEF registered?
Mode-S code A6BBEF 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 A6BBEF broadcasting right now?
No active broadcast right now. Last signal was 10d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6BBEF, octal 51535757, decimal 10,927,087.
What flights does A6BBEF operate?
Mode-S A6BBEF has broadcast 20 distinct callsigns, including DAL1780, DAL506, DAL443, DAL440, DAL422.