Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A7A17B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N591DT · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A7A17B
Octal
51720573
Decimal
10,985,851
Country
US
Tail
N591DT
Type
A21N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
420
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A7A17B.

Country allocation

The ICAO 24-bit address A7A17B 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
DAL2033 - 14 2026-07-14
DAL657 - 12 2026-07-17
DAL860 - 11 2026-07-18
DAL859 - 10 2026-07-14
DAL749 Delta Air Lines 10 2026-07-25
DAL514 Delta Air Lines 10 2026-07-17
DAL1373 - 10 2026-07-17
DAL2775 - 9 2026-06-15
DAL1270 - 9 2026-07-17
DAL499 Delta Air Lines 7 2026-07-09
DAL2036 Delta Air Lines 7 2026-06-14
DAL820 Delta Air Lines 6 2026-06-06
DAL791 Delta Air Lines 6 2026-06-02
DAL745 - 6 2026-07-16
DAL709 Delta Air Lines 6 2026-07-24
DAL393 - 6 2026-06-20
DAL910 Delta Air Lines 5 2026-05-19
DAL546 Delta Air Lines 5 2026-06-04
DAL538 Delta Air Lines 5 2026-07-26
DAL458 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL2244 ATL → MSY Jul 26, 20:20 UTCJul 26, 22:45 UTC2h 25m
2026-07-26 DAL1434 LAX → SLC Jul 26, 17:25 UTCJul 26, 18:50 UTC1h 25m
2026-07-26 DAL538 LAX → JFK Jul 26, 11:35 UTCJul 26, 15:50 UTC4h 15m
2026-07-25 DAL749 LAX → TPA Jul 25, 18:20 UTCJul 25, 22:45 UTC4h 25m
2026-07-25 DAL749 LAX → TPA Jul 25, 18:19 UTCJul 25, 22:54 UTC4h 35m
2026-07-25 DAL2110 DTW → MSP Jul 25, 12:25 UTCJul 25, 15:50 UTC3h 25m
2026-07-25 DAL2110 DTW → MSP Jul 25, 12:20 UTCJul 25, 15:35 UTC3h 15m
2026-07-25 DAL2359 MSP → FSD Jul 25, 07:50 UTCJul 25, 10:25 UTC2h 35m
2026-07-25 DAL2391 ATL → MSY Jul 25, 02:50 UTCJul 25, 06:20 UTC3h 30m
2026-07-24 DAL1661 SJU → JFK Jul 24, 22:10 UTCJul 25, 00:45 UTC2h 35m
2026-07-24 DAL1574 BOS → LGA Jul 24, 13:10 UTCJul 24, 18:40 UTC5h 30m
2026-07-24 DAL709 BOS → DTW Jul 24, 05:20 UTCJul 24, 10:05 UTC4h 45m
2026-07-23 DAL709 BOS → DTW Jul 23, 22:20 UTCJul 24, 03:25 UTC5h 5m
2026-07-23 DAL367 SAN → DTW Jul 23, 14:55 UTCJul 23, 19:50 UTC4h 55m
2026-07-23 DAL685 BNA → BOS Jul 23, 03:30 UTCJul 23, 08:35 UTC5h 5m
2026-07-22 DAL683 SLC → DCA Jul 22, 20:40 UTCJul 23, 01:40 UTC5h 0m
2026-07-22 DAL683 SLC → DCA Jul 22, 13:50 UTCJul 22, 19:00 UTC5h 10m
2026-07-21 DAL2151 ATL → CVG Jul 21, 23:45 UTCJul 22, 02:55 UTC3h 10m
2026-07-21 DAL413 LAX → MSP Jul 21, 18:30 UTCJul 21, 21:40 UTC3h 10m
2026-07-21 DAL2103 MSP → STL Jul 21, 03:30 UTCJul 21, 06:45 UTC3h 15m
2026-07-21 DAL2935 MSP → SAT Jul 21, 00:05 UTCJul 21, 02:10 UTC2h 5m
2026-07-21 DAL2935 MSP → SAT Jul 21, 00:04 UTCJul 21, 02:04 UTC2h 0m
2026-07-20 DAL2658 MSP → SLC Jul 20, 19:40 UTCJul 20, 22:05 UTC2h 25m
2026-07-20 DAL1675 DEN → MSP Jul 20, 15:30 UTCJul 20, 17:05 UTC1h 35m
2026-07-20 DAL1675 MSP → DEN Jul 20, 12:15 UTCJul 20, 13:55 UTC1h 40m
2026-07-19 DAL1042 CVG → LAS Jul 19, 23:25 UTCJul 20, 01:45 UTC2h 20m
2026-07-19 DAL1042 CVG → LAS Jul 19, 19:35 UTCJul 19, 21:45 UTC2h 10m
2026-07-19 DAL1675 DEN → MSP Jul 19, 15:40 UTCJul 19, 17:10 UTC1h 30m
2026-07-19 DAL1675 MSP → DEN Jul 19, 12:15 UTCJul 19, 13:40 UTC1h 25m
2026-07-19 DAL756 OAK → MSP Jul 19, 01:10 UTCJul 19, 04:20 UTC3h 10m
2026-07-19 DAL756 SFO → MSP Jul 19, 01:07 UTCJul 19, 04:16 UTC3h 9m
2026-07-18 DAL860 BOS → SFO Jul 18, 15:20 UTCJul 18, 21:05 UTC5h 45m
2026-07-18 DAL1697 AUS → BOS Jul 18, 05:40 UTCJul 18, 10:05 UTC4h 25m
2026-07-17 DAL514 LGA → ATL Jul 17, 22:33 UTCJul 18, 03:14 UTC4h 41m
2026-07-17 DAL514 LGA → ATL Jul 17, 22:35 UTCJul 18, 02:45 UTC4h 10m
2026-07-17 DAL657 SLC → BOS Jul 17, 16:10 UTCJul 17, 20:15 UTC4h 5m
2026-07-17 DAL657 SLC → BOS Jul 17, 16:08 UTCJul 17, 20:09 UTC4h 1m
2026-07-17 DAL1270 PDX → SLC Jul 17, 12:55 UTCJul 17, 14:20 UTC1h 25m
2026-07-17 DAL1373 SLC → PDX Jul 17, 05:10 UTCJul 17, 06:33 UTC1h 23m
2026-07-17 DAL1373 SLC → PDX Jul 17, 05:15 UTCJul 17, 06:45 UTC1h 30m
2026-07-16 DAL745 - Jul 16, 22:49 UTCJul 17, 03:14 UTC4h 25m
2026-07-16 DAL745 SLC → FLL Jul 16, 17:14 UTCJul 16, 21:30 UTC4h 15m
2026-07-16 DAL1977 TPA → SLC Jul 16, 10:50 UTCJul 16, 14:50 UTC4h 0m
2026-07-15 DAL358 SEA → TPA Jul 15, 19:10 UTCJul 16, 00:30 UTC5h 20m
2026-07-15 DAL1090 - Jul 15, 11:30 UTCJul 15, 16:30 UTC5h 0m
2026-07-15 DAL2077 - Jul 15, 06:00 UTCJul 15, 09:45 UTC3h 45m
2026-07-14 DAL2033 EWR → SLC Jul 14, 22:15 UTCJul 15, 02:15 UTC3h 59m
2026-07-14 DAL2033 - Jul 14, 16:45 UTCJul 14, 20:40 UTC3h 55m
2026-07-14 DAL859 - Jul 14, 10:25 UTCJul 14, 14:50 UTC4h 25m
2026-07-13 DAL860 SFO → BNH Jul 13, 22:20 UTCJul 14, 03:40 UTC5h 20m

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 N591DT page for operator, model, and routing details .

Mode-S A7A17B frequently asked

What is Mode-S code A7A17B?
A7A17B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N591DT.
Where is Mode-S A7A17B registered?
Mode-S code A7A17B 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 A7A17B 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 A7A17B, octal 51720573, decimal 10,985,851.
What flights does A7A17B operate?
Mode-S A7A17B has broadcast 20 distinct callsigns, including DAL2033, DAL657, DAL860, DAL859, DAL749.