Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A50725

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N423DX · AIRBUS A-330-900 · operated by DELTA AIR LINES INC

Hex
A50725
Octal
51203445
Decimal
10,815,269
Country
US
Tail
N423DX
Type
A339
No current signal · last broadcast Jul 26, 20:55 UTC
Flights observed
304
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:55 UTC

Last known position

Most recent position reported by Mode-S A50725.

Country allocation

The ICAO 24-bit address A50725 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
DAL256 Delta Air Lines 10 2026-07-21
DAL125 - 10 2026-06-27
DAL101 - 10 2026-07-12
DAL67 Delta Air Lines 9 2026-07-03
DAL59 Delta Air Lines 9 2026-07-21
DAL58 - 9 2026-06-30
DAL243 - 9 2026-07-15
DAL241 - 9 2026-06-25
DAL110 - 9 2026-07-12
DAL157 Delta Air Lines 8 2026-05-27
DAL133 Delta Air Lines 8 2026-07-20
DAL124 - 8 2026-06-27
DAL222 - 7 2026-06-24
DAL213 Delta Air Lines 7 2026-05-30
DAL273 Delta Air Lines 6 2026-05-28
DAL272 Delta Air Lines 6 2026-05-28
DAL242 - 6 2026-06-27
DAL221 - 6 2026-06-14
DAL212 Delta Air Lines 6 2026-05-30
DAL21 Delta Air Lines 6 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL21 LHR → SEA Jul 26, 17:58 UTCJul 27, 03:32 UTC9h 34m
2026-07-26 DAL20 SEA → LHR Jul 26, 05:15 UTCJul 26, 13:55 UTC8h 41m
2026-07-25 DAL81 CDG → SEA Jul 25, 14:30 UTCJul 26, 00:25 UTC9h 55m
2026-07-25 DAL80 SEA → CDG Jul 25, 02:05 UTCJul 25, 11:05 UTC9h 0m
2026-07-24 DAL145 AMS → SEA Jul 24, 13:35 UTCJul 24, 14:45 UTC1h 10m
2026-07-24 DAL145 AMS → SEA Jul 24, 13:32 UTCJul 24, 22:56 UTC9h 24m
2026-07-24 DAL144 SEA → AMS Jul 24, 01:20 UTCJul 24, 03:10 UTC1h 50m
2026-07-24 DAL144 SEA → AMS Jul 24, 01:15 UTCJul 24, 10:21 UTC9h 6m
2026-07-23 DAL43 LAX → SYD Jul 23, 11:10 UTCJul 23, 22:50 UTC11h 40m
2026-07-22 DAL42 SYD → LAX Jul 22, 21:40 UTCJul 23, 08:20 UTC10h 40m
2026-07-22 DAL42 SYD → LAX Jul 22, 21:45 UTCJul 22, 23:30 UTC1h 45m
2026-07-22 DAL143 FRA → DTW Jul 22, 08:45 UTCJul 22, 18:18 UTC9h 33m
2026-07-21 DAL256 BOS → AMS Jul 21, 20:58 UTCJul 22, 03:23 UTC6h 25m
2026-07-21 DAL256 BOS → AMS Jul 21, 21:00 UTCJul 22, 03:25 UTC6h 25m
2026-07-21 DAL59 LHR → BOS Jul 21, 09:25 UTCJul 21, 16:10 UTC6h 45m
2026-07-20 DAL16 DTW → LHR Jul 20, 22:50 UTCJul 21, 05:45 UTC6h 54m
2026-07-20 DAL133 AMS → DTW Jul 20, 07:45 UTCJul 20, 09:05 UTC1h 20m
2026-07-20 DAL133 AMS → DTW Jul 20, 07:40 UTCJul 20, 15:33 UTC7h 53m
2026-07-19 DAL256 BOS → AMS Jul 19, 21:13 UTCJul 20, 03:28 UTC6h 15m
2026-07-19 DAL256 BOS → AMS Jul 19, 21:15 UTCJul 20, 03:25 UTC6h 10m
2026-07-19 DAL225 - Jul 19, 10:15 UTCJul 19, 11:50 UTC1h 35m
2026-07-19 DAL225 CDG → BOS Jul 19, 10:13 UTCJul 19, 17:21 UTC7h 8m
2026-07-18 DAL220 - Jul 18, 21:50 UTCJul 19, 07:15 UTC9h 25m
2026-07-18 DAL220 SLC → CDG Jul 18, 21:49 UTCJul 19, 07:17 UTC9h 28m
2026-07-18 DAL57 AMS → SLC Jul 18, 09:10 UTCJul 18, 09:15 UTC5m
2026-07-18 DAL57 AMS → SLC Jul 18, 09:06 UTCJul 18, 18:48 UTC9h 42m
2026-07-17 DAL132 - Jul 17, 20:40 UTCJul 18, 04:00 UTC7h 21m
2026-07-17 DAL17 LHR → DTW Jul 17, 10:15 UTCJul 17, 17:40 UTC7h 25m
2026-07-16 DAL16 DTW → LHR Jul 16, 22:59 UTCJul 17, 06:15 UTC7h 15m
2026-07-16 DAL133 - Jul 16, 07:45 UTCJul 16, 09:15 UTC1h 30m
2026-07-16 DAL133 AMS → DTW Jul 16, 07:42 UTCJul 16, 15:27 UTC7h 45m
2026-07-16 DAL133 AMS → DTW Jul 16, 07:42 UTCJul 16, 15:24 UTC7h 42m
2026-07-15 DAL256 BOS → AMS Jul 15, 21:10 UTCJul 16, 03:25 UTC6h 15m
2026-07-15 DAL256 - Jul 15, 21:10 UTCJul 15, 22:20 UTC1h 10m
2026-07-15 DAL243 - Jul 15, 11:10 UTCJul 15, 18:10 UTC7h 0m
2026-07-14 DAL72 ATL → AMS Jul 14, 23:15 UTCJul 15, 07:30 UTC8h 15m
2026-07-12 DAL110 - Jul 12, 23:45 UTCJul 13, 01:25 UTC1h 40m
2026-07-12 DAL110 EZE → ATL Jul 12, 23:44 UTCJul 13, 09:03 UTC9h 19m
2026-07-12 DAL110 EZE → ATL Jul 12, 23:44 UTCJul 13, 09:06 UTC9h 22m
2026-07-12 DAL101 ATL → EZE Jul 12, 05:38 UTCJul 12, 15:16 UTC9h 38m
2026-07-12 DAL101 ATL → EZE Jul 12, 05:40 UTCJul 12, 15:15 UTC9h 35m
2026-07-08 DAL110 - Jul 8, 23:20 UTCJul 9, 09:20 UTC10h 0m
2026-07-08 DAL101 - Jul 8, 03:20 UTCJul 8, 08:55 UTC5h 35m
2026-07-08 DAL101 ATL → EZE Jul 8, 03:18 UTCJul 8, 12:42 UTC9h 24m
2026-07-07 DAL55 - Jul 7, 05:15 UTCJul 7, 22:15 UTC17h 0m
2026-07-06 DAL54 ATL → LOS Jul 6, 21:29 UTCJul 7, 08:36 UTC11h 7m
2026-07-06 DAL54 - Jul 6, 21:30 UTCJul 7, 14:30 UTC17h 0m
2026-07-06 DAL215 - Jul 6, 08:20 UTCJul 6, 18:30 UTC10h 10m
2026-07-05 DAL214 ATL → FCO Jul 5, 20:50 UTCJul 6, 05:35 UTC8h 45m
2026-07-05 DAL214 ATL → FCO Jul 5, 20:47 UTCJul 6, 05:36 UTC8h 49m

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 N423DX page for operator, model, and routing details .

Mode-S A50725 frequently asked

What is Mode-S code A50725?
A50725 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N423DX.
Where is Mode-S A50725 registered?
Mode-S code A50725 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 A50725 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A50725, octal 51203445, decimal 10,815,269.
What flights does A50725 operate?
Mode-S A50725 has broadcast 20 distinct callsigns, including DAL256, DAL125, DAL101, DAL67, DAL59.