Apparatus

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sensors Mode-S transponder

A690A8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N522DA · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A690A8
Octal
51510250
Decimal
10,916,008
Country
US
Tail
N522DA
Type
A21N
No current signal · last broadcast 4h ago
Flights observed
376
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A690A8.

Country allocation

The ICAO 24-bit address A690A8 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 - 12 2026-06-28
DAL977 Delta Air Lines 11 2026-05-06
DAL486 Delta Air Lines 11 2026-05-28
DAL351 - 11 2026-06-19
DAL359 - 10 2026-06-20
DAL375 - 9 2026-06-21
DAL340 Delta Air Lines 8 2026-05-25
DAL778 - 7 2026-04-13
DAL473 - 7 2026-06-28
DAL332 Delta Air Lines 7 2026-05-22
DAL684 - 6 2026-06-29
DAL506 - 6 2026-07-03
DAL474 Delta Air Lines 6 2026-05-22
DAL451 - 6 2026-06-30
DAL1719 Delta Air Lines 6 2026-06-09
DAL485 Delta Air Lines 5 2026-05-03
DAL428 - 5 2026-06-18
DAL1908 - 5 2026-07-13
DAL740 - 4 2026-06-30
DAL658 Delta Air Lines 4 2026-05-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL1908 - Jul 13, 18:25 UTCJul 14, 03:25 UTC9h 0m
2026-07-12 DAL1917 JFK → JFK Jul 12, 12:55 UTCJul 12, 22:00 UTC9h 5m
2026-07-11 DAL1833 PUJ → JFK Jul 11, 18:23 UTCJul 11, 21:37 UTC3h 14m
2026-07-11 DAL1994 - Jul 11, 12:40 UTCJul 11, 13:25 UTC45m
2026-07-11 DAL1863 - Jul 11, 02:15 UTCJul 11, 03:01 UTC45m
2026-07-10 DAL1908 - Jul 10, 18:45 UTCJul 10, 19:25 UTC40m
2026-07-10 DAL1908 JFK → SDQ Jul 10, 18:41 UTCJul 10, 22:03 UTC3h 22m
2026-07-10 DAL336 DEN → JFK Jul 10, 13:05 UTCJul 10, 16:25 UTC3h 20m
2026-07-10 DAL493 ATL → DEN Jul 10, 01:10 UTCJul 10, 03:55 UTC2h 45m
2026-07-09 DAL906 SLC → ATL Jul 9, 19:45 UTCJul 9, 23:10 UTC3h 25m
2026-07-09 DAL1698 LAS → SLC Jul 9, 17:15 UTCJul 9, 18:10 UTC55m
2026-07-09 DAL1698 SLC → LAS Jul 9, 14:35 UTCJul 9, 15:30 UTC55m
2026-07-09 DAL2223 ANC → SLC Jul 9, 08:55 UTCJul 9, 13:00 UTC4h 5m
2026-07-09 DAL2713 SLC → ANC Jul 9, 02:55 UTCJul 9, 07:30 UTC4h 35m
2026-07-09 DAL1672 LAS → SLC Jul 9, 00:10 UTCJul 9, 01:05 UTC55m
2026-07-08 DAL1672 SLC → LAS Jul 8, 21:40 UTCJul 8, 22:45 UTC1h 5m
2026-07-08 DAL464 BOS → SLC Jul 8, 15:30 UTCJul 8, 20:05 UTC4h 35m
2026-07-08 DAL2436 MCO → BOS Jul 8, 11:10 UTCJul 8, 13:40 UTC2h 30m
2026-07-08 DAL1513 BOS → MCO Jul 8, 05:00 UTCJul 8, 07:25 UTC2h 25m
2026-07-07 DAL2591 MSP → BOS Jul 7, 23:30 UTCJul 8, 01:50 UTC2h 20m
2026-07-07 DAL799 - Jul 7, 15:25 UTCJul 7, 18:35 UTC3h 10m
2026-07-07 DAL799 LAX → MSP Jul 7, 15:23 UTCJul 7, 18:25 UTC3h 2m
2026-07-07 DAL476 ATL → SLC Jul 7, 12:05 UTCJul 7, 12:35 UTC30m
2026-07-07 DAL418 - Jul 7, 00:10 UTCJul 7, 00:40 UTC30m
2026-07-07 DAL418 LAX → OGG Jul 7, 00:06 UTCJul 7, 05:19 UTC5h 13m
2026-07-06 DAL422 - Jul 6, 17:35 UTCJul 6, 17:50 UTC15m
2026-07-06 DAL422 HNL → LAX Jul 6, 17:30 UTCJul 6, 22:22 UTC4h 52m
2026-07-06 DAL422 HNL → LAX Jul 6, 17:30 UTCJul 6, 22:14 UTC4h 44m
2026-07-05 DAL465 - Jul 5, 21:10 UTCJul 6, 02:35 UTC5h 25m
2026-07-05 DAL465 LAX → HNL Jul 5, 21:09 UTCJul 6, 02:31 UTC5h 22m
2026-07-05 DAL829 - Jul 5, 17:50 UTCJul 5, 19:15 UTC1h 25m
2026-07-05 DAL1318 - Jul 5, 14:20 UTCJul 5, 15:45 UTC1h 25m
2026-07-04 DAL753 - Jul 4, 19:35 UTCJul 4, 23:50 UTC4h 15m
2026-07-04 DAL390 DTW → LAX Jul 4, 13:15 UTCJul 4, 17:05 UTC3h 50m
2026-07-04 DAL390 DTW → LAX Jul 4, 13:12 UTCJul 4, 17:01 UTC3h 49m
2026-07-04 DAL450 DTW → SFO Jul 4, 02:35 UTCJul 4, 07:25 UTC4h 50m
2026-07-03 DAL506 SEA → MIA Jul 3, 15:55 UTCJul 3, 21:34 UTC5h 39m
2026-07-03 DAL506 - Jul 3, 15:55 UTCJul 3, 21:40 UTC5h 45m
2026-06-30 DAL740 - Jun 30, 21:05 UTCJul 1, 02:25 UTC5h 20m
2026-06-30 DAL451 PDX → JFK Jun 30, 14:20 UTCJun 30, 19:10 UTC4h 50m
2026-06-29 DAL684 - Jun 29, 23:44 UTCJun 30, 03:45 UTC4h 1m
2026-06-29 DAL684 - Jun 29, 22:30 UTCJun 29, 23:39 UTC1h 10m
2026-06-29 DAL1792 SLC → JFK Jun 29, 16:39 UTCJun 29, 20:35 UTC3h 55m
2026-06-29 DAL859 - Jun 29, 10:29 UTCJun 29, 15:14 UTC4h 45m
2026-06-29 DAL859 BNH → BNH Jun 29, 10:10 UTCJun 29, 10:15 UTC5m
2026-06-28 DAL1780 - Jun 28, 21:10 UTCJun 28, 21:59 UTC50m
2026-06-28 DAL1780 - Jun 28, 18:25 UTCJun 28, 18:40 UTC15m
2026-06-28 DAL1780 SJU → BOS Jun 28, 18:24 UTCJun 28, 21:56 UTC3h 32m
2026-06-28 DAL1780 - Jun 28, 16:39 UTCJun 28, 17:00 UTC20m
2026-06-28 DAL1780 - Jun 28, 13:40 UTCJun 28, 14:14 UTC35m

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 N522DA page for operator, model, and routing details .

Mode-S A690A8 frequently asked

What is Mode-S code A690A8?
A690A8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N522DA.
Where is Mode-S A690A8 registered?
Mode-S code A690A8 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 A690A8 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A690A8, octal 51510250, decimal 10,916,008.
What flights does A690A8 operate?
Mode-S A690A8 has broadcast 20 distinct callsigns, including DAL1780, DAL977, DAL486, DAL351, DAL359.