Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A68CFD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N521DN · AIRBUS A-350-900 · operated by DELTA AIR LINES INC

Hex
A68CFD
Octal
51506375
Decimal
10,915,069
Country
US
Tail
N521DN
Type
A359
Broadcasting now · callsign DAL189 · 40,000 ft
Flights observed
98
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A68CFD is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A68CFD 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
DAL40 Delta Air Lines 9 2026-05-14
DAL201 Delta Air Lines 7 2026-05-21
DAL200 Delta Air Lines 6 2026-05-21
DAL159 Delta Air Lines 6 2026-05-27
DAL1502 Delta Air Lines 6 2026-04-25
DAL41 Delta Air Lines 5 2026-05-13
DAL39 Delta Air Lines 5 2026-05-18
DAL27 Delta Air Lines 5 2026-05-26
DAL26 Delta Air Lines 5 2026-05-29
DAL189 Delta Air Lines 5 2026-05-29
DAL158 Delta Air Lines 5 2026-05-27
DAL12 Delta Air Lines 4 2026-04-15
DAL500 Delta Air Lines 3 2026-04-16
DAL211 Delta Air Lines 3 2026-04-29
DAL188 Delta Air Lines 3 2026-05-11
DAL11 Delta Air Lines 3 2026-04-14
DAL327 Delta Air Lines 2 2026-05-19
DAL298 Delta Air Lines 2 2026-05-09
DAL295 Delta Air Lines 2 2026-04-22
DAL210 Delta Air Lines 2 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DAL189 ATL → ICN May 29, 14:20 UTCMay 30, 03:15 UTC12h 55m
2026-05-29 DAL26 ICN → ATL May 29, 03:45 UTCMay 29, 08:10 UTC4h 25m
2026-05-28 DAL26 ICN → ATL May 28, 14:05 UTCMay 28, 23:40 UTC9h 35m
2026-05-27 DAL159 DTW → ICN May 27, 18:10 UTCMay 28, 01:30 UTC7h 20m
2026-05-27 DAL159 DTW → ICN May 27, 18:09 UTCMay 28, 08:12 UTC14h 3m
2026-05-27 DAL158 ICN → DTW May 27, 01:34 UTCMay 27, 03:09 UTC1h 35m
2026-05-27 DAL158 ICN → DTW May 27, 01:31 UTCMay 27, 13:58 UTC12h 27m
2026-05-26 DAL27 ATL → ICN May 26, 04:30 UTCMay 26, 18:42 UTC14h 12m
2026-05-26 DAL27 ATL → ICN May 26, 04:30 UTCMay 26, 18:45 UTC14h 15m
2026-05-25 DAL26 ICN → ATL May 25, 11:10 UTCMay 26, 00:44 UTC13h 34m
2026-05-25 DAL26 ICN → ATL May 25, 11:10 UTCMay 26, 00:46 UTC13h 36m
2026-05-24 DAL159 DTW → ICN May 24, 17:00 UTCMay 25, 05:15 UTC12h 15m
2026-05-24 DAL159 DTW → ICN May 24, 16:56 UTCMay 25, 06:13 UTC13h 17m
2026-05-24 DAL158 ICN → DTW May 24, 01:25 UTCMay 24, 13:40 UTC12h 15m
2026-05-23 DAL27 ATL → ICN May 23, 04:25 UTCMay 23, 18:25 UTC14h 0m
2026-05-21 DAL201 JNB → ATL May 21, 20:15 UTCMay 21, 20:45 UTC30m
2026-05-21 DAL201 JNB → ATL May 21, 20:12 UTCMay 22, 12:21 UTC16h 9m
2026-05-21 DAL200 ATL → JNB May 21, 02:45 UTCMay 21, 17:00 UTC14h 15m
2026-05-21 DAL200 ATL → JNB May 21, 02:43 UTCMay 21, 16:57 UTC14h 14m
2026-05-19 DAL327 ATL → BOS May 19, 22:40 UTCMay 20, 02:35 UTC3h 55m
2026-05-19 DAL327 ATL → BOS May 19, 22:36 UTCMay 20, 02:33 UTC3h 57m
2026-05-19 DAL38 JFK → VCE May 19, 03:55 UTCMay 19, 19:50 UTC15h 55m
2026-05-18 DAL39 JFK → VCE May 18, 21:30 UTCMay 19, 19:50 UTC22h 20m
2026-05-18 DAL39 JFK → VCE May 18, 19:20 UTCMay 19, 19:15 UTC23h 55m
2026-05-18 DAL9929 NAP → ATL May 18, 18:42 UTCMay 19, 06:28 UTC11h 46m
2026-05-18 DAL39 JFK → VCE May 18, 18:45 UTCMay 19, 11:10 UTC16h 25m
2026-05-17 DAL39 JFK → VCE May 17, 19:35 UTCMay 18, 01:25 UTC5h 50m
2026-05-17 DAL39 JFK → VCE May 17, 19:35 UTCMay 18, 01:22 UTC5h 47m
2026-05-14 DAL40 SYD → LAX May 14, 01:19 UTCMay 14, 14:22 UTC13h 3m
2026-05-14 DAL40 SYD → LAX May 14, 01:20 UTCMay 14, 14:40 UTC13h 20m
2026-05-13 DAL41 LAX → SYD May 13, 06:05 UTCMay 13, 20:35 UTC14h 30m
2026-05-13 DAL41 LAX → SYD May 13, 06:02 UTCMay 13, 20:33 UTC14h 31m
2026-05-12 DAL763 ATL → LGA May 12, 02:45 UTCMay 12, 03:55 UTC1h 10m
2026-05-11 DAL188 ICN → ATL May 11, 07:40 UTCMay 11, 20:30 UTC12h 50m
2026-05-10 DAL189 ATL → ICN May 10, 14:09 UTCMay 11, 04:50 UTC14h 40m
2026-05-09 DAL299 JFK → SFO May 9, 13:00 UTCMay 9, 22:49 UTC9h 50m
2026-05-09 DAL298 JFK → LOS May 9, 01:28 UTCMay 9, 10:22 UTC8h 54m
2026-05-09 DAL298 JFK → LOS May 9, 01:30 UTCMay 9, 10:25 UTC8h 55m
2026-05-07 DAL201 JNB → ATL May 7, 20:40 UTCMay 8, 13:00 UTC16h 20m
2026-05-07 DAL200 ATL → JNB May 7, 03:50 UTCMay 7, 18:20 UTC14h 30m
2026-05-06 DAL188 ICN → ATL May 6, 08:05 UTCMay 6, 20:55 UTC12h 49m
2026-05-05 DAL189 ATL → ICN May 5, 14:15 UTCMay 6, 05:45 UTC15h 30m
2026-05-05 DAL146 SCL → ATL May 5, 05:25 UTCMay 5, 11:45 UTC6h 20m
2026-05-05 DAL146 SCL → ATL May 5, 02:22 UTCMay 5, 11:46 UTC9h 24m
2026-05-04 DAL147 ATL → SCL May 4, 02:39 UTCMay 4, 08:40 UTC6h 0m
2026-05-02 DAL201 JNB → ATL May 2, 20:10 UTCMay 3, 12:40 UTC16h 29m
2026-05-02 DAL200 ATL → JNB May 2, 02:45 UTCMay 2, 17:10 UTC14h 25m
2026-05-01 DAL188 ICN → ATL May 1, 07:40 UTCMay 1, 20:45 UTC13h 5m
2026-04-30 DAL189 ATL → ICN Apr 30, 13:50 UTCMay 1, 04:56 UTC15h 6m
2026-04-30 DAL189 ATL → ICN Apr 30, 13:50 UTCMay 1, 04:45 UTC14h 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 N521DN page for operator, model, and routing details .

Mode-S A68CFD frequently asked

What is Mode-S code A68CFD?
A68CFD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N521DN.
Where is Mode-S A68CFD registered?
Mode-S code A68CFD 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 A68CFD broadcasting right now?
Yes. Mode-S A68CFD is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A68CFD, octal 51506375, decimal 10,915,069.
What flights does A68CFD operate?
Mode-S A68CFD has broadcast 20 distinct callsigns, including DAL40, DAL201, DAL200, DAL159, DAL1502.