Apparatus

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sensors Mode-S transponder

A5237F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N430DX · operated by DELTA AIR LINES INC

Hex
A5237F
Octal
51221577
Decimal
10,822,527
Country
US
Tail
N430DX
Type
A339
Broadcasting now · callsign DAL143 · 19,025 ft
Flights observed
293
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Current position

A5237F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A5237F 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
DAL136 Delta Air Lines 14 2026-07-17
DAL81 - 11 2026-07-10
DAL57 Delta Air Lines 9 2026-07-23
DAL137 - 9 2026-07-16
DAL237 - 8 2026-07-15
DAL21 - 8 2026-06-30
DAL125 Delta Air Lines 8 2026-07-20
DAL9 - 7 2026-07-04
DAL80 - 7 2026-07-10
DAL236 - 7 2026-07-16
DAL220 Delta Air Lines 7 2026-07-23
DAL257 - 6 2026-07-17
DAL225 Delta Air Lines 6 2026-07-24
DAL221 - 6 2026-06-23
DAL20 Delta Air Lines 6 2026-06-30
DAL145 - 6 2026-07-09
DAL58 Delta Air Lines 5 2026-07-20
DAL56 - 5 2026-06-23
DAL42 Delta Air Lines 5 2026-07-01
DAL298 - 5 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL249 TLV → ATL Jul 26, 11:55 UTCJul 26, 13:45 UTC1h 50m
2026-07-26 DAL249 TLV → ATL Jul 26, 11:55 UTCJul 26, 22:43 UTC10h 48m
2026-07-25 DAL248 ATL → TLV Jul 25, 22:45 UTCJul 26, 07:45 UTC9h 1m
2026-07-25 DAL248 ATL → TLV Jul 25, 22:42 UTCJul 26, 08:24 UTC9h 42m
2026-07-25 DAL143 FRA → DTW Jul 25, 09:00 UTCJul 25, 18:40 UTC9h 40m
2026-07-24 DAL256 BOS → AMS Jul 24, 21:26 UTCJul 25, 03:27 UTC6h 1m
2026-07-24 DAL256 BOS → AMS Jul 24, 21:30 UTCJul 25, 03:30 UTC6h 0m
2026-07-24 DAL225 CDG → BOS Jul 24, 10:10 UTCJul 24, 17:00 UTC6h 50m
2026-07-23 DAL220 SLC → CDG Jul 23, 21:55 UTCJul 24, 07:05 UTC9h 10m
2026-07-23 DAL57 AMS → SLC Jul 23, 09:15 UTCJul 23, 09:45 UTC30m
2026-07-23 DAL57 AMS → SLC Jul 23, 09:10 UTCJul 23, 18:59 UTC9h 49m
2026-07-23 DAL57 AMS → SLC Jul 23, 09:10 UTCJul 23, 19:04 UTC9h 54m
2026-07-22 DAL134 DTW → AMS Jul 22, 22:45 UTCJul 23, 05:55 UTC7h 10m
2026-07-22 DAL135 - Jul 22, 11:10 UTCJul 22, 17:35 UTC6h 25m
2026-07-21 DAL134 DTW → AMS Jul 21, 22:45 UTCJul 22, 00:00 UTC1h 15m
2026-07-21 DAL134 DTW → AMS Jul 21, 22:43 UTCJul 22, 06:05 UTC7h 22m
2026-07-21 DAL17 - Jul 21, 09:55 UTCJul 21, 11:15 UTC1h 20m
2026-07-21 DAL17 LHR → DTW Jul 21, 09:50 UTCJul 21, 17:47 UTC7h 57m
2026-07-20 DAL58 BOS → LHR Jul 20, 23:30 UTCJul 21, 05:40 UTC6h 9m
2026-07-20 DAL125 LIS → BOS Jul 20, 19:55 UTCJul 20, 20:00 UTC5m
2026-07-20 DAL125 LIS → BOS Jul 20, 13:18 UTCJul 20, 19:40 UTC6h 22m
2026-07-20 DAL125 LIS → BOS Jul 20, 13:18 UTCJul 20, 19:57 UTC6h 39m
2026-07-20 DAL125 LIS → BOS Jul 20, 13:20 UTCJul 20, 14:00 UTC40m
2026-07-20 DAL124 BOS → LIS Jul 20, 04:40 UTCJul 20, 10:35 UTC5h 55m
2026-07-19 DAL243 - Jul 19, 09:50 UTCJul 19, 17:00 UTC7h 10m
2026-07-18 DAL132 - Jul 18, 20:40 UTCJul 19, 03:40 UTC7h 0m
2026-07-18 DAL132 DTW → AMS Jul 18, 20:39 UTCJul 19, 03:48 UTC7h 9m
2026-07-18 DAL17 LHR → DTW Jul 18, 10:10 UTCJul 18, 17:50 UTC7h 40m
2026-07-17 DAL58 BOS → LHR Jul 17, 23:37 UTCJul 18, 05:47 UTC6h 10m
2026-07-17 DAL58 BOS → LHR Jul 17, 23:39 UTCJul 18, 05:45 UTC6h 6m
2026-07-17 DAL257 - Jul 17, 13:05 UTCJul 17, 19:49 UTC6h 45m
2026-07-17 DAL136 DTW → AMS Jul 17, 02:44 UTCJul 17, 10:15 UTC7h 31m
2026-07-17 DAL136 DTW → AMS Jul 17, 02:45 UTCJul 17, 10:10 UTC7h 25m
2026-07-16 DAL137 AMS → DTW Jul 16, 12:54 UTCJul 16, 20:36 UTC7h 42m
2026-07-16 DAL137 AMS → DTW Jul 16, 12:54 UTCJul 16, 20:30 UTC7h 36m
2026-07-16 DAL137 - Jul 16, 12:55 UTCJul 16, 14:15 UTC1h 20m
2026-07-16 DAL236 - Jul 16, 01:20 UTCJul 16, 04:55 UTC3h 35m
2026-07-16 DAL236 TPA → AMS Jul 16, 01:19 UTCJul 16, 09:54 UTC8h 35m
2026-07-15 DAL237 - Jul 15, 13:40 UTCJul 15, 22:40 UTC9h 0m
2026-07-15 DAL48 - Jul 15, 03:10 UTCJul 15, 04:45 UTC1h 35m
2026-07-15 DAL48 JFK → AMS Jul 15, 03:09 UTCJul 15, 09:59 UTC6h 50m
2026-07-14 DAL226 - Jul 14, 13:50 UTCJul 14, 14:35 UTC45m
2026-07-14 DAL226 GRU → JFK Jul 14, 13:48 UTCJul 14, 23:27 UTC9h 39m
2026-07-13 DAL227 JFK → GRU Jul 13, 02:26 UTCJul 13, 11:08 UTC8h 42m
2026-07-13 DAL227 - Jul 13, 02:30 UTCJul 13, 06:55 UTC4h 25m
2026-07-12 DAL979 LAX → JFK Jul 12, 14:30 UTCJul 12, 19:30 UTC5h 0m
2026-07-12 DAL752 JFK → LAX Jul 12, 02:21 UTCJul 12, 07:08 UTC4h 47m
2026-07-12 DAL752 JFK → LAX Jul 12, 02:20 UTCJul 12, 07:20 UTC5h 0m
2026-07-11 DAL49 - Jul 11, 20:40 UTCJul 11, 22:10 UTC1h 30m
2026-07-11 DAL49 - Jul 11, 14:40 UTCJul 11, 20:35 UTC5h 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 N430DX page for operator, model, and routing details .

Mode-S A5237F frequently asked

What is Mode-S code A5237F?
A5237F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N430DX.
Where is Mode-S A5237F registered?
Mode-S code A5237F 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 A5237F broadcasting right now?
Yes. Mode-S A5237F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5237F, octal 51221577, decimal 10,822,527.
What flights does A5237F operate?
Mode-S A5237F has broadcast 20 distinct callsigns, including DAL136, DAL81, DAL57, DAL137, DAL237.