Apparatus

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sensors Mode-S transponder

A388AF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N327DU · operated by DELTA AIR LINES INC

Hex
A388AF
Octal
50704257
Decimal
10,717,359
Country
US
Tail
N327DU
Type
BCS3
Transponder active on ground
Flights observed
430
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A388AF.

Country allocation

The ICAO 24-bit address A388AF 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
DAL2917 Delta Air Lines 14 2026-07-03
DAL1390 - 13 2026-07-01
DAL572 - 12 2026-07-01
DAL1567 - 11 2026-06-29
DAL2310 - 9 2026-06-25
DAL2194 Delta Air Lines 8 2026-06-10
DAL2985 - 7 2026-06-30
DAL2930 - 7 2026-06-27
DAL1387 - 7 2026-07-02
DAL814 Delta Air Lines 6 2026-05-24
DAL2226 Delta Air Lines 6 2026-06-06
DAL2068 - 6 2026-07-02
DAL1529 Delta Air Lines 6 2026-05-24
DAL878 Delta Air Lines 5 2026-04-14
DAL2617 - 5 2026-06-27
DAL2332 Delta Air Lines 5 2026-07-05
DAL2318 - 5 2026-07-10
DAL2185 - 5 2026-07-06
DAL2099 - 5 2026-06-16
DAL1172 - 5 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL2828 - Jul 14, 12:20 UTCJul 14, 13:45 UTC1h 25m
2026-07-14 DAL2804 BOS → ORD Jul 14, 01:12 UTCJul 14, 03:13 UTC2h 1m
2026-07-14 DAL2804 BOS → ORD Jul 14, 01:15 UTCJul 14, 03:15 UTC2h 0m
2026-07-13 DAL1156 AUS → BOS Jul 13, 20:00 UTCJul 13, 23:40 UTC3h 40m
2026-07-13 DAL1156 AUS → BOS Jul 13, 19:56 UTCJul 13, 23:39 UTC3h 43m
2026-07-13 DAL739 SEA → AUS Jul 13, 14:55 UTCJul 13, 18:35 UTC3h 40m
2026-07-13 DAL2408 - Jul 13, 10:10 UTCJul 13, 13:25 UTC3h 15m
2026-07-13 DAL2186 SEA → FAI Jul 13, 06:01 UTCJul 13, 09:15 UTC3h 15m
2026-07-13 DAL373 - Jul 13, 00:05 UTCJul 13, 04:30 UTC4h 25m
2026-07-12 DAL1710 - Jul 12, 16:45 UTCJul 12, 20:35 UTC3h 50m
2026-07-12 DAL1710 SEA → BNA Jul 12, 16:41 UTCJul 12, 20:35 UTC3h 54m
2026-07-12 DAL1731 - Jul 12, 12:40 UTCJul 12, 15:01 UTC2h 20m
2026-07-12 DAL2851 SEA → DEN Jul 12, 03:15 UTCJul 12, 05:25 UTC2h 10m
2026-07-11 DAL2449 PHX → SEA Jul 11, 22:58 UTCJul 12, 01:26 UTC2h 28m
2026-07-11 DAL2449 PHX → SEA Jul 11, 23:00 UTCJul 12, 01:30 UTC2h 30m
2026-07-11 DAL2449 - Jul 11, 19:05 UTCJul 11, 21:30 UTC2h 25m
2026-07-11 DAL853 - Jul 11, 14:05 UTCJul 11, 17:15 UTC3h 10m
2026-07-11 DAL853 ANC → SEA Jul 11, 14:04 UTCJul 11, 17:12 UTC3h 8m
2026-07-11 DAL936 - Jul 11, 05:01 UTCJul 11, 08:01 UTC3h 0m
2026-07-10 DAL373 - Jul 10, 23:05 UTCJul 11, 03:40 UTC4h 35m
2026-07-10 DAL373 BNA → SEA Jul 10, 23:01 UTCJul 11, 03:41 UTC4h 40m
2026-07-10 DAL1710 SEA → BNA Jul 10, 16:40 UTCJul 10, 20:45 UTC4h 5m
2026-07-10 DAL2318 - Jul 10, 01:55 UTCJul 10, 04:15 UTC2h 20m
2026-07-09 DAL2318 - Jul 9, 22:15 UTCJul 10, 00:30 UTC2h 15m
2026-07-09 DAL853 ANC → SEA Jul 9, 14:09 UTCJul 9, 17:07 UTC2h 58m
2026-07-09 DAL853 ANC → SEA Jul 9, 14:10 UTCJul 9, 17:10 UTC3h 0m
2026-07-09 DAL936 SEA → ANC Jul 9, 04:35 UTCJul 9, 07:50 UTC3h 15m
2026-07-08 DAL408 DFW → SEA Jul 8, 21:25 UTCJul 9, 01:05 UTC3h 40m
2026-07-08 DAL803 - Jul 8, 16:45 UTCJul 8, 19:55 UTC3h 10m
2026-07-08 DAL1731 - Jul 8, 12:45 UTCJul 8, 15:05 UTC2h 20m
2026-07-08 DAL1731 DEN → SEA Jul 8, 12:41 UTCJul 8, 15:04 UTC2h 23m
2026-07-08 DAL2851 - Jul 8, 03:30 UTCJul 8, 05:45 UTC2h 15m
2026-07-07 DAL408 - Jul 7, 21:40 UTCJul 8, 01:15 UTC3h 35m
2026-07-07 DAL408 DFW → SEA Jul 7, 21:35 UTCJul 8, 01:14 UTC3h 39m
2026-07-07 DAL303 - Jul 7, 16:15 UTCJul 7, 19:45 UTC3h 30m
2026-07-07 DAL303 BOS → DFW Jul 7, 16:12 UTCJul 7, 19:46 UTC3h 34m
2026-07-07 DAL2828 - Jul 7, 12:40 UTCJul 7, 14:35 UTC1h 55m
2026-07-07 DAL2828 ORD → BOS Jul 7, 12:39 UTCJul 7, 14:34 UTC1h 55m
2026-07-07 DAL2513 LGA → ORD Jul 7, 05:35 UTCJul 7, 07:30 UTC1h 55m
2026-07-06 DAL2943 SEA → SFO Jul 6, 23:55 UTCJul 7, 03:00 UTC3h 5m
2026-07-06 DAL2644 - Jul 6, 20:05 UTCJul 6, 22:20 UTC2h 15m
2026-07-06 DAL2185 - Jul 6, 15:15 UTCJul 6, 18:25 UTC3h 10m
2026-07-05 DAL2107 - Jul 5, 23:40 UTCJul 6, 02:55 UTC3h 15m
2026-07-05 DAL2332 ATL → MCI Jul 5, 19:05 UTCJul 5, 20:55 UTC1h 50m
2026-07-05 DAL2332 ATL → MCI Jul 5, 18:49 UTCJul 5, 20:53 UTC2h 4m
2026-07-05 DAL2332 ATL → MCI Jul 5, 14:25 UTCJul 5, 15:20 UTC55m
2026-07-05 DAL1193 DCA → MSP Jul 5, 10:35 UTCJul 5, 13:05 UTC2h 30m
2026-07-04 DAL2759 SFO → BOS Jul 4, 13:00 UTCJul 4, 13:40 UTC40m
2026-07-04 DAL2394 GRR → DTW Jul 4, 00:50 UTCJul 4, 02:40 UTC1h 50m
2026-07-04 DAL2394 GRR → DTW Jul 4, 00:44 UTCJul 4, 02:39 UTC1h 55m

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 N327DU page for operator, model, and routing details .

Mode-S A388AF frequently asked

What is Mode-S code A388AF?
A388AF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N327DU.
Where is Mode-S A388AF registered?
Mode-S code A388AF 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 A388AF broadcasting right now?
Mode-S A388AF is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A388AF, octal 50704257, decimal 10,717,359.
What flights does A388AF operate?
Mode-S A388AF has broadcast 20 distinct callsigns, including DAL2917, DAL1390, DAL572, DAL1567, DAL2310.