sensors Mode-S transponder

A402DD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N358DN · AIRBUS A-321 · operated by DELTA AIR LINES INC

Hex
A402DD
Octal
51001335
Decimal
10,748,637
Country
US
Tail
N358DN
Type
A321
No current signal · last broadcast 16h ago
Flights observed
12
Distinct callsigns
7
Country
US
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S A402DD.

Country allocation

The ICAO 24-bit address A402DD 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 7 distinct

Callsign Airline Flights Last seen
DAL1099 - 4 2026-04-13
DAL2233 - 3 2026-04-13
DAL2276 - 1 2026-04-14
DAL1621 - 1 2026-04-12
DAL1329 - 1 2026-04-13
DAL1028 - 1 2026-04-12
DAL1011 Delta Air Lines 1 2026-04-13

Recent flights last 12

DateFlightRouteTakeoffLandingDuration
2026-04-14 DAL2276 ATL → JAX Apr 14, 05:55 UTCApr 14, 06:35 UTC40m
2026-04-13 DAL1329 - Apr 13, 20:41 UTCApr 13, 22:10 UTC1h 29m
2026-04-13 DAL1099 TPA → ATL Apr 13, 17:50 UTCApr 13, 18:55 UTC1h 5m
2026-04-13 DAL1099 - Apr 13, 16:15 UTCApr 13, 16:30 UTC15m
2026-04-13 DAL1099 - Apr 13, 15:50 UTCApr 13, 16:30 UTC40m
2026-04-13 DAL1099 - Apr 13, 15:25 UTCApr 13, 16:15 UTC50m
2026-04-13 DAL2233 - Apr 13, 12:20 UTCApr 13, 13:45 UTC1h 25m
2026-04-13 DAL2233 - Apr 13, 11:55 UTCApr 13, 13:45 UTC1h 50m
2026-04-13 DAL2233 - Apr 13, 11:40 UTCApr 13, 12:15 UTC35m
2026-04-13 DAL1011 ATL → BDL Apr 13, 02:00 UTCApr 13, 03:55 UTC1h 55m
2026-04-12 DAL1028 - Apr 12, 23:55 UTCApr 13, 00:10 UTC15m
2026-04-12 DAL1621 - Apr 12, 18:20 UTCApr 12, 20:15 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 N358DN page for operator, model, and routing details .

Mode-S A402DD frequently asked

What is Mode-S code A402DD?
A402DD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N358DN.
Where is Mode-S A402DD registered?
Mode-S code A402DD 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 A402DD broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A402DD, octal 51001335, decimal 10,748,637.
What flights does A402DD operate?
Mode-S A402DD has broadcast 7 distinct callsigns, including DAL1099, DAL2233, DAL2276, DAL1621, DAL1329.