Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6981A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N524DE · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A6981A
Octal
51514032
Decimal
10,917,914
Country
US
Tail
N524DE
Type
A21N
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
457
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A6981A.

Country allocation

The ICAO 24-bit address A6981A 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 - 13 2026-07-18
DAL422 - 9 2026-07-21
DAL1780 - 8 2026-06-23
DAL351 Delta Air Lines 7 2026-07-22
DAL863 Delta Air Lines 6 2026-07-17
DAL705 Delta Air Lines 6 2026-07-18
DAL465 Delta Air Lines 6 2026-07-21
DAL419 - 6 2026-07-02
DAL359 Delta Air Lines 6 2026-07-23
DAL333 Delta Air Lines 6 2026-04-14
DAL2915 Delta Air Lines 6 2026-04-14
DAL658 - 5 2026-07-02
DAL504 - 5 2026-07-10
DAL486 - 5 2026-07-08
DAL440 Delta Air Lines 5 2026-07-03
DAL2049 Delta Air Lines 5 2026-06-01
DAL1961 Delta Air Lines 5 2026-05-21
DAL1943 Delta Air Lines 5 2026-06-05
DAL867 - 4 2026-07-15
DAL688 Delta Air Lines 4 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1955 JFK → MBJ Jul 26, 12:50 UTCJul 26, 21:25 UTC8h 35m
2026-07-25 DAL1822 STI → JFK Jul 25, 20:20 UTCJul 25, 21:10 UTC50m
2026-07-25 DAL1845 JFK → STI Jul 25, 12:55 UTCJul 25, 13:35 UTC40m
2026-07-25 DAL1845 JFK → STI Jul 25, 12:52 UTCJul 25, 16:06 UTC3h 14m
2026-07-25 DAL452 JFK → SEA Jul 25, 06:00 UTCJul 25, 10:25 UTC4h 25m
2026-07-24 DAL740 PWM → ATL Jul 24, 21:30 UTCJul 25, 03:10 UTC5h 40m
2026-07-24 DAL451 BOS → DFW Jul 24, 14:20 UTCJul 24, 18:55 UTC4h 35m
2026-07-24 DAL451 BOS → DFW Jul 24, 14:16 UTCJul 24, 18:49 UTC4h 33m
2026-07-23 DAL684 JFK → ATL Jul 23, 22:41 UTCJul 24, 04:08 UTC5h 27m
2026-07-23 DAL684 JFK → ATL Jul 23, 22:45 UTCJul 24, 04:10 UTC5h 25m
2026-07-23 DAL1792 CVG → ATL Jul 23, 16:15 UTCJul 23, 20:05 UTC3h 50m
2026-07-23 DAL1128 JFK → PBI Jul 23, 12:40 UTCJul 23, 14:10 UTC1h 30m
2026-07-23 DAL359 PSP → ATL Jul 23, 03:40 UTCJul 23, 04:40 UTC1h 0m
2026-07-22 DAL359 PSP → ATL Jul 22, 23:25 UTCJul 22, 23:35 UTC10m
2026-07-22 DAL351 JFK → LAX Jul 22, 15:40 UTCJul 22, 21:20 UTC5h 40m
2026-07-22 DAL485 - Jul 22, 12:40 UTCJul 22, 13:25 UTC45m
2026-07-22 DAL311 SFO → JFK Jul 22, 04:55 UTCJul 22, 05:10 UTC15m
2026-07-21 DAL311 SFO → JFK Jul 21, 23:55 UTCJul 22, 00:25 UTC30m
2026-07-21 DAL422 - Jul 21, 17:15 UTCJul 21, 17:30 UTC15m
2026-07-21 DAL422 HNL → LAX Jul 21, 17:10 UTCJul 21, 22:12 UTC5h 2m
2026-07-21 DAL465 LAX → HNL Jul 21, 02:15 UTCJul 21, 02:40 UTC25m
2026-07-20 DAL465 LAX → HNL Jul 20, 21:10 UTCJul 20, 22:15 UTC1h 5m
2026-07-20 DAL829 - Jul 20, 17:50 UTCJul 20, 19:10 UTC1h 20m
2026-07-20 DAL1117 BOS → MSP Jul 20, 13:30 UTCJul 20, 15:05 UTC1h 35m
2026-07-20 DAL685 BNA → BOS Jul 20, 02:15 UTCJul 20, 07:00 UTC4h 45m
2026-07-19 DAL1822 STI → JFK Jul 19, 18:04 UTCJul 19, 21:17 UTC3h 13m
2026-07-19 DAL1822 STI → JFK Jul 19, 13:10 UTCJul 19, 21:20 UTC8h 10m
2026-07-18 DAL1966 - Jul 18, 17:25 UTCJul 18, 21:25 UTC4h 0m
2026-07-18 DAL1966 SJU → JFK Jul 18, 17:24 UTCJul 18, 21:21 UTC3h 57m
2026-07-18 DAL1966 JFK → SJU Jul 18, 12:15 UTCJul 18, 15:30 UTC3h 15m
2026-07-18 DAL705 MCO → SEA Jul 18, 06:20 UTCJul 18, 10:20 UTC4h 0m
2026-07-17 DAL863 JFK → SLC Jul 17, 23:10 UTCJul 18, 03:40 UTC4h 31m
2026-07-17 DAL1966 - Jul 17, 17:25 UTCJul 17, 20:55 UTC3h 30m
2026-07-17 DAL1966 - Jul 17, 15:05 UTCJul 17, 15:25 UTC20m
2026-07-17 DAL1966 - Jul 17, 12:10 UTCJul 17, 12:50 UTC40m
2026-07-17 DAL1863 - Jul 17, 02:25 UTCJul 17, 03:10 UTC45m
2026-07-16 DAL1908 - Jul 16, 18:34 UTCJul 16, 19:35 UTC1h 0m
2026-07-16 DAL336 DEN → JFK Jul 16, 12:44 UTCJul 16, 16:00 UTC3h 15m
2026-07-16 DAL424 JFK → DEN Jul 16, 00:40 UTCJul 16, 04:05 UTC3h 25m
2026-07-15 DAL1829 - Jul 15, 13:20 UTCJul 15, 22:05 UTC8h 45m
2026-07-15 DAL1917 - Jul 15, 12:45 UTCJul 15, 13:15 UTC30m
2026-07-15 DAL1668 MCO → JFK Jul 15, 03:55 UTCJul 15, 06:05 UTC2h 10m
2026-07-15 DAL867 - Jul 15, 00:35 UTCJul 15, 01:05 UTC30m
2026-07-15 DAL867 SRQ → MCO Jul 15, 00:33 UTCJul 15, 00:58 UTC25m
2026-07-14 DAL867 - Jul 14, 17:55 UTCJul 14, 22:50 UTC4h 54m
2026-07-14 DAL996 ATL → LAX Jul 14, 11:30 UTCJul 14, 15:30 UTC4h 0m
2026-07-14 DAL996 ATL → LAX Jul 14, 11:30 UTCJul 14, 15:16 UTC3h 46m
2026-07-14 DAL2045 DTW → ATL Jul 14, 00:05 UTCJul 14, 01:35 UTC1h 30m
2026-07-13 DAL1070 PHX → DTW Jul 13, 18:05 UTCJul 13, 21:40 UTC3h 35m
2026-07-13 DAL1070 - Jul 13, 12:50 UTCJul 13, 16:15 UTC3h 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 N524DE page for operator, model, and routing details .

Mode-S A6981A frequently asked

What is Mode-S code A6981A?
A6981A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N524DE.
Where is Mode-S A6981A registered?
Mode-S code A6981A 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 A6981A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6981A, octal 51514032, decimal 10,917,914.
What flights does A6981A operate?
Mode-S A6981A has broadcast 20 distinct callsigns, including DAL1966, DAL422, DAL1780, DAL351, DAL863.