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 1d ago
Flights observed
268
Distinct callsigns
20
Country
US
Last broadcast
1d ago

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
DAL125 - 10 2026-06-27
DAL101 - 10 2026-07-12
DAL67 Delta Air Lines 9 2026-07-03
DAL58 - 9 2026-06-30
DAL241 - 9 2026-06-25
DAL110 - 9 2026-07-12
DAL59 - 8 2026-07-01
DAL243 Delta Air Lines 8 2026-06-09
DAL157 Delta Air Lines 8 2026-05-27
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
DAL56 - 5 2026-06-14
DAL21 Delta Air Lines 5 2026-06-06
DAL203 Delta Air Lines 5 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-04 DAL110 - Jul 4, 23:40 UTCJul 5, 09:15 UTC9h 35m
2026-07-04 DAL101 - Jul 4, 03:10 UTCJul 4, 04:40 UTC1h 30m
2026-07-04 DAL101 ATL → EZE Jul 4, 03:06 UTCJul 4, 12:40 UTC9h 34m
2026-07-03 DAL67 FCO → ATL Jul 3, 11:35 UTCJul 3, 13:15 UTC1h 40m
2026-07-03 DAL67 FCO → ATL Jul 3, 11:30 UTCJul 3, 21:36 UTC10h 6m
2026-07-02 DAL66 ATL → FCO Jul 2, 23:33 UTCJul 3, 08:39 UTC9h 6m
2026-07-02 DAL66 - Jul 2, 23:35 UTCJul 3, 02:45 UTC3h 10m
2026-07-02 DAL223 ATH → ATL Jul 2, 07:00 UTCJul 2, 18:30 UTC11h 30m
2026-07-01 DAL240 BOS → ATH Jul 1, 19:40 UTCJul 2, 04:25 UTC8h 45m
2026-07-01 DAL59 - Jul 1, 08:50 UTCJul 1, 16:05 UTC7h 15m
2026-06-30 DAL58 BOS → LHR Jun 30, 23:22 UTCJul 1, 05:25 UTC6h 3m
2026-06-30 DAL58 BOS → LHR Jun 30, 23:25 UTCJul 1, 05:35 UTC6h 10m
2026-06-30 DAL225 - Jun 30, 10:35 UTCJun 30, 12:15 UTC1h 40m
2026-06-30 DAL225 CDG → BOS Jun 30, 10:30 UTCJun 30, 17:35 UTC7h 5m
2026-06-29 DAL220 SLC → CDG Jun 29, 21:54 UTCJun 30, 06:55 UTC9h 1m
2026-06-29 DAL57 - Jun 29, 09:20 UTCJun 29, 18:55 UTC9h 35m
2026-06-28 DAL132 - Jun 28, 20:39 UTCJun 29, 03:49 UTC7h 10m
2026-06-28 DAL133 AMS → DTW Jun 28, 08:00 UTCJun 28, 15:44 UTC7h 45m
2026-06-27 DAL242 BOS → AMS Jun 27, 23:08 UTCJun 28, 05:23 UTC6h 15m
2026-06-27 DAL242 - Jun 27, 23:10 UTCJun 28, 05:15 UTC6h 5m
2026-06-27 DAL125 BOS → BOS Jun 27, 19:39 UTCJun 27, 19:45 UTC5m
2026-06-27 DAL125 LIS → BOS Jun 27, 12:35 UTCJun 27, 19:23 UTC6h 48m
2026-06-27 DAL125 LIS → BOS Jun 27, 12:35 UTCJun 27, 19:41 UTC7h 6m
2026-06-27 DAL125 - Jun 27, 12:39 UTCJun 27, 13:09 UTC30m
2026-06-27 DAL124 - Jun 27, 04:19 UTCJun 27, 04:59 UTC40m
2026-06-27 DAL124 BOS → LIS Jun 27, 04:18 UTCJun 27, 10:04 UTC5h 46m
2026-06-26 DAL59 - Jun 26, 14:35 UTCJun 26, 15:54 UTC1h 20m
2026-06-26 DAL59 - Jun 26, 09:10 UTCJun 26, 10:25 UTC1h 15m
2026-06-26 DAL58 LHR → LHR Jun 26, 05:19 UTCJun 26, 05:35 UTC15m
2026-06-25 DAL58 BOS → LHR Jun 25, 23:25 UTCJun 26, 05:04 UTC5h 39m
2026-06-25 DAL241 ATH → BOS Jun 25, 10:25 UTCJun 25, 20:30 UTC10h 5m
2026-06-24 DAL222 ATL → ATH Jun 24, 21:36 UTCJun 25, 07:53 UTC10h 17m
2026-06-24 DAL222 - Jun 24, 21:40 UTCJun 25, 00:29 UTC2h 50m
2026-06-24 DAL109 - Jun 24, 08:14 UTCJun 24, 16:59 UTC8h 45m
2026-06-23 DAL62 ATL → FCO Jun 23, 23:24 UTCJun 24, 05:29 UTC6h 5m
2026-06-23 DAL125 LIS → BOS Jun 23, 13:34 UTCJun 23, 20:11 UTC6h 37m

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 1d ago.
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 DAL125, DAL101, DAL67, DAL58, DAL241.