Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6D83C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N540DE · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A6D83C
Octal
51554074
Decimal
10,934,332
Country
US
Tail
N540DE
Type
A21N
Broadcasting now · callsign DAL451 · 34,975 ft
Flights observed
466
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Current position

A6D83C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6D83C 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
DAL440 Delta Air Lines 16 2026-07-25
DAL977 Delta Air Lines 14 2026-04-16
DAL359 - 12 2026-07-16
DAL351 - 11 2026-07-15
DAL328 Delta Air Lines 10 2026-07-26
DAL1672 Delta Air Lines 10 2026-07-24
DAL311 - 8 2026-07-15
DAL1966 - 8 2026-07-12
DAL786 - 7 2026-06-21
DAL485 - 7 2026-07-15
DAL443 Delta Air Lines 7 2026-07-25
DAL384 Delta Air Lines 7 2026-05-16
DAL2713 Delta Air Lines 6 2026-07-24
DAL1698 - 6 2026-07-10
DAL613 - 5 2026-06-25
DAL465 - 5 2026-07-13
DAL400 Delta Air Lines 5 2026-06-15
DAL340 - 5 2026-07-20
DAL2223 Delta Air Lines 5 2026-07-24
DAL1863 - 5 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL415 ATL → BOS Jul 26, 18:55 UTCJul 26, 23:00 UTC4h 5m
2026-07-26 DAL328 OGG → SEA Jul 26, 01:15 UTCJul 26, 06:50 UTC5h 36m
2026-07-25 DAL328 OGG → SEA Jul 25, 18:30 UTCJul 25, 23:30 UTC5h 0m
2026-07-25 DAL440 ATL → SFO Jul 25, 13:20 UTCJul 25, 14:15 UTC55m
2026-07-25 DAL440 ATL → SFO Jul 25, 09:05 UTCJul 25, 09:15 UTC10m
2026-07-25 DAL440 ATL → SFO Jul 25, 09:04 UTCJul 25, 14:16 UTC5h 12m
2026-07-25 DAL443 ATL → PHL Jul 25, 01:50 UTCJul 25, 07:10 UTC5h 20m
2026-07-25 DAL443 ATL → PHL Jul 25, 01:45 UTCJul 25, 07:02 UTC5h 17m
2026-07-24 DAL1876 SJD → LAX Jul 24, 23:00 UTCJul 24, 23:45 UTC45m
2026-07-24 DAL1875 LAX → SJD Jul 24, 18:25 UTCJul 24, 19:00 UTC35m
2026-07-24 DAL1875 LAX → SJD Jul 24, 18:20 UTCJul 24, 20:28 UTC2h 8m
2026-07-24 DAL1087 SLC → MCO Jul 24, 15:05 UTCJul 24, 16:35 UTC1h 30m
2026-07-24 DAL2223 STL → MSP Jul 24, 09:30 UTCJul 24, 13:30 UTC4h 0m
2026-07-24 DAL2713 ATL → MKE Jul 24, 03:20 UTCJul 24, 07:45 UTC4h 25m
2026-07-24 DAL1672 MSP → MKE Jul 24, 00:45 UTCJul 24, 01:35 UTC50m
2026-07-23 DAL1672 MSP → MKE Jul 23, 22:25 UTCJul 23, 23:25 UTC1h 0m
2026-07-23 DAL464 - Jul 23, 16:05 UTCJul 23, 20:45 UTC4h 40m
2026-07-23 DAL2436 MCO → BNH Jul 23, 11:45 UTCJul 23, 14:15 UTC2h 30m
2026-07-22 DAL718 JFK → PHX Jul 22, 23:15 UTCJul 23, 03:50 UTC4h 35m
2026-07-22 DAL1651 MSP → LAX Jul 22, 18:15 UTCJul 22, 21:30 UTC3h 15m
2026-07-22 DAL1651 MSP → LAX Jul 22, 18:12 UTCJul 22, 21:23 UTC3h 11m
2026-07-22 DAL792 LAX → MSP Jul 22, 13:30 UTCJul 22, 16:40 UTC3h 10m
2026-07-21 DAL382 SEA → TPA Jul 21, 21:45 UTCJul 22, 02:10 UTC4h 25m
2026-07-21 DAL2032 SLC → MCO Jul 21, 16:00 UTCJul 21, 20:00 UTC4h 0m
2026-07-21 DAL1128 - Jul 21, 12:40 UTCJul 21, 14:15 UTC1h 35m
2026-07-21 DAL9895 HNL → MSP Jul 21, 04:52 UTCJul 21, 10:04 UTC5h 12m
2026-07-21 DAL9895 HNL → MSP Jul 21, 04:55 UTCJul 21, 05:20 UTC25m
2026-07-20 DAL340 - Jul 20, 03:10 UTCJul 20, 03:30 UTC20m
2026-07-19 DAL340 - Jul 19, 22:00 UTCJul 19, 22:55 UTC55m
2026-07-19 DAL2995 SLC → SEA Jul 19, 17:50 UTCJul 19, 19:25 UTC1h 35m
2026-07-19 DAL830 ATL → SLC Jul 19, 12:30 UTCJul 19, 15:45 UTC3h 15m
2026-07-19 DAL905 SLC → ATL Jul 19, 00:25 UTCJul 19, 03:50 UTC3h 25m
2026-07-18 DAL1209 PDX → SLC Jul 18, 21:05 UTCJul 18, 22:35 UTC1h 30m
2026-07-18 DAL1209 SLC → PDX Jul 18, 18:05 UTCJul 18, 19:30 UTC1h 25m
2026-07-18 DAL1009 EWR → SLC Jul 18, 11:40 UTCJul 18, 16:00 UTC4h 20m
2026-07-18 DAL2038 SLC → EWR Jul 18, 05:55 UTCJul 18, 09:35 UTC3h 40m
2026-07-18 DAL1210 - Jul 18, 01:05 UTCJul 18, 02:35 UTC1h 30m
2026-07-17 DAL1210 SLC → SAN Jul 17, 21:39 UTCJul 17, 23:10 UTC1h 30m
2026-07-17 DAL663 ATL → SLC Jul 17, 16:10 UTCJul 17, 19:20 UTC3h 10m
2026-07-17 DAL923 BOS → ATL Jul 17, 12:25 UTCJul 17, 14:24 UTC2h 0m
2026-07-17 DAL1655 - Jul 17, 05:30 UTCJul 17, 10:30 UTC5h 0m
2026-07-16 DAL1655 BOS → SFO Jul 16, 21:35 UTCJul 17, 03:14 UTC5h 40m
2026-07-16 DAL459 SEA → BNH Jul 16, 15:25 UTCJul 16, 20:05 UTC4h 40m
2026-07-16 DAL359 - Jul 16, 03:40 UTCJul 16, 04:40 UTC1h 0m
2026-07-15 DAL359 - Jul 15, 23:30 UTCJul 15, 23:45 UTC15m
2026-07-15 DAL359 HNL → SEA Jul 15, 23:28 UTCJul 16, 04:42 UTC5h 14m
2026-07-15 DAL351 - Jul 15, 15:45 UTCJul 15, 21:25 UTC5h 40m
2026-07-15 DAL485 - Jul 15, 12:40 UTCJul 15, 13:25 UTC45m
2026-07-15 DAL485 - Jul 15, 08:00 UTCJul 15, 08:20 UTC20m
2026-07-15 DAL311 - Jul 15, 05:10 UTCJul 15, 05:20 UTC10m

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 N540DE page for operator, model, and routing details .

Mode-S A6D83C frequently asked

What is Mode-S code A6D83C?
A6D83C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N540DE.
Where is Mode-S A6D83C registered?
Mode-S code A6D83C 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 A6D83C broadcasting right now?
Yes. Mode-S A6D83C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6D83C, octal 51554074, decimal 10,934,332.
What flights does A6D83C operate?
Mode-S A6D83C has broadcast 20 distinct callsigns, including DAL440, DAL977, DAL359, DAL351, DAL328.