Apparatus

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sensors Mode-S transponder

A64CDB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N505DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC

Hex
A64CDB
Octal
51446333
Decimal
10,898,651
Country
US
Tail
N505DN
Type
A359
No current signal · last broadcast 6h ago
Flights observed
187
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S A64CDB.

Country allocation

The ICAO 24-bit address A64CDB 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
DAL389 - 27 2026-07-13
DAL281 - 19 2026-07-07
DAL68 - 15 2026-06-29
DAL69 - 14 2026-06-28
DAL275 - 14 2026-07-11
DAL280 - 13 2026-07-14
DAL274 - 13 2026-07-12
DAL197 Delta Air Lines 12 2026-06-29
DAL388 - 11 2026-07-08
DAL172 Delta Air Lines 10 2026-05-06
DAL196 - 9 2026-06-30
DAL173 Delta Air Lines 8 2026-05-07
DAL167 - 4 2026-06-12
DAL95 - 3 2026-07-11
DAL166 - 3 2026-06-13
DAL9908 Delta Air Lines 2 2026-06-11
DAL96 - 2 2026-07-08
DAL137 Delta Air Lines 2 2026-05-12
DAL136 Delta Air Lines 2 2026-05-12
DAL9960 Delta Air Lines 1 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL280 - Jul 14, 11:10 UTCJul 14, 13:05 UTC1h 55m
2026-07-13 DAL389 - Jul 13, 18:50 UTCJul 14, 13:05 UTC18h 15m
2026-07-13 DAL389 DTW → PVG Jul 13, 16:48 UTCJul 14, 06:54 UTC14h 6m
2026-07-13 DAL389 - Jul 13, 16:50 UTCJul 14, 13:05 UTC20h 15m
2026-07-12 DAL274 - Jul 12, 09:55 UTCJul 12, 21:35 UTC11h 40m
2026-07-11 DAL275 - Jul 11, 18:20 UTCJul 12, 06:30 UTC12h 10m
2026-07-11 DAL275 DTW → HND Jul 11, 18:18 UTCJul 12, 06:40 UTC12h 22m
2026-07-11 DAL95 - Jul 11, 07:45 UTCJul 11, 08:45 UTC1h 0m
2026-07-11 DAL95 CDG → DTW Jul 11, 07:45 UTCJul 11, 15:35 UTC7h 50m
2026-07-10 DAL82 - Jul 10, 20:55 UTCJul 11, 04:35 UTC7h 40m
2026-07-09 DAL83 - Jul 9, 08:20 UTCJul 9, 17:05 UTC8h 45m
2026-07-08 DAL96 - Jul 8, 21:20 UTCJul 9, 04:25 UTC7h 5m
2026-07-08 DAL388 - Jul 8, 02:50 UTCJul 8, 15:20 UTC12h 30m
2026-07-07 DAL388 SFO → JFK Jul 7, 09:00 UTCJul 8, 04:40 UTC19h 40m
2026-07-07 DAL281 - Jul 7, 00:30 UTCJul 7, 10:35 UTC10h 5m
2026-07-06 DAL280 - Jul 6, 06:15 UTCJul 6, 21:35 UTC15h 20m
2026-07-06 DAL280 - Jul 6, 00:55 UTCJul 6, 21:35 UTC20h 40m
2026-07-05 DAL389 - Jul 5, 23:10 UTCJul 6, 21:35 UTC22h 25m
2026-07-05 DAL389 - Jul 5, 18:50 UTCJul 6, 13:55 UTC19h 5m
2026-07-05 DAL389 - Jul 5, 18:15 UTCJul 6, 13:55 UTC19h 40m
2026-07-04 DAL274 - Jul 4, 10:15 UTCJul 4, 21:30 UTC11h 15m
2026-07-04 DAL274 HND → DTW Jul 4, 10:11 UTCJul 4, 21:27 UTC11h 16m
2026-07-03 DAL275 - Jul 3, 18:40 UTCJul 4, 08:10 UTC13h 30m
2026-07-03 DAL95 - Jul 3, 08:15 UTCJul 3, 16:20 UTC8h 5m
2026-07-02 DAL96 - Jul 2, 21:30 UTCJul 3, 04:10 UTC6h 40m
2026-07-02 DAL388 SFO → JFK Jul 2, 02:55 UTCJul 2, 15:05 UTC12h 10m
2026-07-02 DAL388 SFO → JFK Jul 2, 02:04 UTCJul 2, 15:07 UTC13h 3m
2026-07-01 DAL281 - Jul 1, 08:50 UTCJul 2, 04:20 UTC19h 30m
2026-07-01 DAL281 - Jul 1, 08:40 UTCJul 2, 04:20 UTC19h 40m
2026-06-30 DAL281 SEA → PVG Jun 30, 23:43 UTCJul 1, 11:31 UTC11h 48m
2026-06-30 DAL281 - Jun 30, 23:45 UTCJul 1, 10:40 UTC10h 55m
2026-06-30 DAL196 ICN → SEA Jun 30, 10:20 UTCJun 30, 19:30 UTC9h 10m
2026-06-29 DAL197 SEA → ICN Jun 29, 20:19 UTCJun 30, 07:10 UTC10h 51m
2026-06-29 DAL197 SEA → ICN Jun 29, 20:19 UTCJun 30, 07:22 UTC11h 3m
2026-06-29 DAL68 - Jun 29, 03:44 UTCJun 29, 12:14 UTC8h 30m
2026-06-29 DAL68 - Jun 29, 02:20 UTCJun 29, 02:30 UTC10m
2026-06-29 DAL68 TPE → SEA Jun 29, 02:15 UTCJun 29, 12:13 UTC9h 58m
2026-06-28 DAL69 - Jun 28, 11:19 UTCJun 28, 11:45 UTC25m
2026-06-27 DAL69 - Jun 27, 23:34 UTCJun 28, 09:55 UTC10h 20m
2026-06-27 DAL196 ICN → SEA Jun 27, 10:25 UTCJun 27, 19:29 UTC9h 5m
2026-06-26 DAL197 SEA → ICN Jun 26, 20:29 UTCJun 27, 07:24 UTC10h 55m
2026-06-26 DAL68 - Jun 26, 04:00 UTCJun 26, 12:59 UTC9h 0m
2026-06-26 DAL68 - Jun 26, 02:34 UTCJun 26, 02:50 UTC15m
2026-06-25 DAL69 - Jun 25, 11:39 UTCJun 25, 11:59 UTC20m
2026-06-24 DAL69 - Jun 24, 23:50 UTCJun 25, 10:30 UTC10h 40m
2026-06-24 DAL280 PVG → SEA Jun 24, 09:42 UTCJun 24, 19:20 UTC9h 38m
2026-06-23 DAL389 - Jun 23, 20:59 UTCJun 24, 19:24 UTC22h 25m
2026-06-23 DAL389 - Jun 23, 19:04 UTCJun 24, 18:44 UTC23h 40m
2026-06-23 DAL389 - Jun 23, 16:50 UTCJun 24, 12:09 UTC19h 20m
2026-06-23 DAL389 - Jun 23, 16:35 UTCJun 24, 12:09 UTC19h 35m

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 N505DN page for operator, model, and routing details .

Mode-S A64CDB frequently asked

What is Mode-S code A64CDB?
A64CDB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N505DN.
Where is Mode-S A64CDB registered?
Mode-S code A64CDB 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 A64CDB broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A64CDB, octal 51446333, decimal 10,898,651.
What flights does A64CDB operate?
Mode-S A64CDB has broadcast 20 distinct callsigns, including DAL389, DAL281, DAL68, DAL69, DAL275.