Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A6F23D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N547DE · AIRBUS A-321neo · operated by DELTA AIR LINES INC

Hex
A6F23D
Octal
51571075
Decimal
10,940,989
Country
US
Tail
N547DE
Type
A21N
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
406
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A6F23D.

Country allocation

The ICAO 24-bit address A6F23D 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
DAL482 - 11 2026-07-12
DAL465 - 11 2026-07-15
DAL440 Delta Air Lines 11 2026-07-26
DAL422 - 11 2026-06-30
DAL443 Delta Air Lines 9 2026-07-26
DAL2012 Delta Air Lines 9 2026-05-03
DAL435 Delta Air Lines 8 2026-07-21
DAL384 - 8 2026-06-16
DAL486 - 6 2026-07-12
DAL328 Delta Air Lines 6 2026-07-26
DAL311 - 6 2026-06-24
DAL683 Delta Air Lines 5 2026-04-22
DAL428 - 5 2026-07-18
DAL400 - 5 2026-07-09
DAL375 - 5 2026-07-19
DAL345 Delta Air Lines 5 2026-07-20
DAL2119 - 5 2026-07-18
DAL1876 - 5 2026-06-11
DAL1219 Delta Air Lines 5 2026-07-25
DAL1138 - 5 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL328 OGG → SEA Jul 26, 16:20 UTCJul 26, 21:15 UTC4h 55m
2026-07-26 DAL440 ATL → SFO Jul 26, 13:20 UTCJul 26, 14:15 UTC55m
2026-07-26 DAL440 ATL → SFO Jul 26, 09:05 UTCJul 26, 09:15 UTC10m
2026-07-26 DAL443 ATL → PHL Jul 26, 01:45 UTCJul 26, 07:00 UTC5h 16m
2026-07-26 DAL443 ATL → PHL Jul 26, 01:42 UTCJul 26, 07:03 UTC5h 21m
2026-07-25 DAL1219 RSW → BOS Jul 25, 20:00 UTCJul 25, 23:55 UTC3h 55m
2026-07-25 DAL1219 RSW → BOS Jul 25, 19:59 UTCJul 25, 23:49 UTC3h 50m
2026-07-24 DAL897 SJC → ATL Jul 24, 14:55 UTCJul 24, 18:25 UTC3h 30m
2026-07-23 DAL1647 LAX → SLC Jul 23, 20:20 UTCJul 23, 21:45 UTC1h 25m
2026-07-23 DAL504 BOS → ATL Jul 23, 14:00 UTCJul 23, 18:30 UTC4h 30m
2026-07-22 DAL2056 IAH → LAX Jul 22, 23:40 UTCJul 23, 03:35 UTC3h 55m
2026-07-22 DAL1647 LAX → SLC Jul 22, 20:30 UTCJul 22, 21:55 UTC1h 25m
2026-07-22 DAL504 BOS → ATL Jul 22, 14:25 UTCJul 22, 18:50 UTC4h 25m
2026-07-22 DAL718 JFK → PHX Jul 22, 00:05 UTCJul 22, 04:35 UTC4h 30m
2026-07-21 DAL1651 MSP → LAX Jul 21, 18:25 UTCJul 21, 21:50 UTC3h 25m
2026-07-21 DAL792 LAX → MSP Jul 21, 13:30 UTCJul 21, 16:40 UTC3h 10m
2026-07-21 DAL435 EWR → ATL Jul 21, 06:45 UTCJul 21, 11:40 UTC4h 55m
2026-07-21 DAL435 EWR → ATL Jul 21, 06:30 UTCJul 21, 11:36 UTC5h 6m
2026-07-20 DAL345 BOS → SEA Jul 20, 23:05 UTCJul 20, 23:55 UTC49m
2026-07-20 DAL2921 SLC → SEA Jul 20, 19:35 UTCJul 20, 21:05 UTC1h 30m
2026-07-20 DAL387 ATL → SLC Jul 20, 14:25 UTCJul 20, 17:35 UTC3h 10m
2026-07-20 DAL652 DEN → BOS Jul 20, 07:15 UTCJul 20, 11:20 UTC4h 5m
2026-07-19 DAL506 LGA → ATL Jul 19, 23:30 UTCJul 20, 05:15 UTC5h 45m
2026-07-19 DAL506 LGA → ATL Jul 19, 15:35 UTCJul 19, 21:10 UTC5h 35m
2026-07-19 DAL375 - Jul 19, 12:25 UTCJul 19, 13:15 UTC50m
2026-07-18 DAL428 - Jul 18, 22:05 UTCJul 19, 03:15 UTC5h 10m
2026-07-18 DAL428 LAX → LIH Jul 18, 22:02 UTCJul 19, 03:27 UTC5h 25m
2026-07-18 DAL2119 MSP → LAX Jul 18, 16:45 UTCJul 18, 20:00 UTC3h 15m
2026-07-18 DAL2303 BOS → MSP Jul 18, 10:05 UTCJul 18, 12:50 UTC2h 45m
2026-07-18 DAL865 ATL → BOS Jul 18, 05:05 UTCJul 18, 07:10 UTC2h 5m
2026-07-18 DAL865 ATL → BOS Jul 18, 05:03 UTCJul 18, 07:11 UTC2h 8m
2026-07-17 DAL875 LGA → ATL Jul 17, 23:25 UTCJul 18, 02:45 UTC3h 20m
2026-07-17 DAL1647 LAX → SLC Jul 17, 20:20 UTCJul 17, 21:39 UTC1h 20m
2026-07-17 DAL504 - Jul 17, 14:04 UTCJul 17, 18:29 UTC4h 25m
2026-07-17 DAL448 SEA → MCO Jul 17, 07:05 UTCJul 17, 12:15 UTC5h 10m
2026-07-17 DAL328 MCO → SEA Jul 17, 00:14 UTCJul 17, 05:25 UTC5h 10m
2026-07-16 DAL328 SEA → MCO Jul 16, 16:49 UTCJul 16, 22:19 UTC5h 30m
2026-07-16 DAL440 - Jul 16, 13:30 UTCJul 16, 14:20 UTC50m
2026-07-15 DAL465 - Jul 15, 21:05 UTCJul 16, 02:15 UTC5h 10m
2026-07-15 DAL465 LAX → HNL Jul 15, 21:04 UTCJul 16, 02:06 UTC5h 2m
2026-07-15 DAL829 SLC → LAX Jul 15, 17:40 UTCJul 15, 19:05 UTC1h 25m
2026-07-15 DAL830 ATL → SLC Jul 15, 12:35 UTCJul 15, 15:45 UTC3h 10m
2026-07-15 DAL905 SLC → ATL Jul 15, 00:10 UTCJul 15, 03:35 UTC3h 25m
2026-07-14 DAL1120 SEA → SLC Jul 14, 20:50 UTCJul 14, 22:35 UTC1h 45m
2026-07-14 DAL1120 SEA → SLC Jul 14, 20:50 UTCJul 14, 22:35 UTC1h 45m
2026-07-14 DAL347 MCO → SEA Jul 14, 13:15 UTCJul 14, 18:25 UTC5h 10m
2026-07-13 DAL2056 - Jul 13, 23:45 UTCJul 14, 03:40 UTC3h 55m
2026-07-13 DAL1209 - Jul 13, 20:35 UTCJul 13, 22:10 UTC1h 35m
2026-07-13 DAL1209 SLC → PDX Jul 13, 17:35 UTCJul 13, 19:10 UTC1h 35m
2026-07-13 DAL1318 LAX → SLC Jul 13, 14:25 UTCJul 13, 15:50 UTC1h 25m

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 N547DE page for operator, model, and routing details .

Mode-S A6F23D frequently asked

What is Mode-S code A6F23D?
A6F23D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N547DE.
Where is Mode-S A6F23D registered?
Mode-S code A6F23D 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 A6F23D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6F23D, octal 51571075, decimal 10,940,989.
What flights does A6F23D operate?
Mode-S A6F23D has broadcast 20 distinct callsigns, including DAL482, DAL465, DAL440, DAL422, DAL443.