Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A53D80

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N437DX · AIRBUS A-330-900 · operated by DELTA AIR LINES INC

Hex
A53D80
Octal
51236600
Decimal
10,829,184
Country
US
Tail
N437DX
Type
A339
No current signal · last broadcast 40m ago
Flights observed
158
Distinct callsigns
20
Country
US
Last broadcast
40m ago

Last known position

Most recent position reported by Mode-S A53D80.

Country allocation

The ICAO 24-bit address A53D80 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
DAL951 Delta Air Lines 7 2026-05-05
DAL742 Delta Air Lines 7 2026-05-05
DAL9 Delta Air Lines 6 2026-05-02
DAL67 Delta Air Lines 6 2026-05-21
DAL215 Delta Air Lines 6 2026-05-28
DAL81 Delta Air Lines 5 2026-04-17
DAL71 Delta Air Lines 5 2026-05-27
DAL66 Delta Air Lines 5 2026-05-20
DAL256 Delta Air Lines 5 2026-05-26
DAL214 Delta Air Lines 5 2026-05-27
DAL63 Delta Air Lines 4 2026-05-22
DAL4 Delta Air Lines 4 2026-05-03
DAL3 Delta Air Lines 4 2026-05-02
DAL243 Delta Air Lines 4 2026-05-26
DAL223 Delta Air Lines 4 2026-05-18
DAL165 Delta Air Lines 4 2026-05-06
DAL164 Delta Air Lines 4 2026-04-16
DAL142 Delta Air Lines 4 2026-05-23
DAL10 Delta Air Lines 4 2026-05-03
DAL80 Delta Air Lines 3 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 DAL224 SEA → AMS May 29, 23:35 UTCMay 30, 06:00 UTC6h 25m
2026-05-29 DAL241 ATH → BOS May 29, 10:45 UTCMay 29, 20:25 UTC9h 40m
2026-05-28 DAL222 ATL → ATH May 28, 21:57 UTCMay 29, 08:18 UTC10h 21m
2026-05-28 DAL222 ATL → ATH May 28, 22:00 UTCMay 29, 08:20 UTC10h 20m
2026-05-28 DAL215 FCO → ATL May 28, 08:20 UTCMay 28, 18:10 UTC9h 50m
2026-05-27 DAL214 ATL → FCO May 27, 20:25 UTCMay 28, 05:40 UTC9h 15m
2026-05-27 DAL214 ATL → FCO May 27, 20:21 UTCMay 28, 05:38 UTC9h 17m
2026-05-27 DAL71 AMS → ATL May 27, 07:45 UTCMay 27, 16:40 UTC8h 55m
2026-05-27 DAL71 AMS → ATL May 27, 07:42 UTCMay 27, 16:37 UTC8h 55m
2026-05-26 DAL256 BOS → AMS May 26, 21:04 UTCMay 27, 03:34 UTC6h 30m
2026-05-26 DAL243 TLV → BOS May 26, 09:49 UTCMay 26, 16:50 UTC7h 0m
2026-05-25 DAL256 BOS → AMS May 25, 20:50 UTCMay 26, 03:09 UTC6h 20m
2026-05-25 DAL243 TLV → BOS May 25, 10:00 UTCMay 25, 17:10 UTC7h 10m
2026-05-24 DAL256 BOS → AMS May 24, 20:48 UTCMay 25, 03:04 UTC6h 16m
2026-05-24 DAL256 BOS → AMS May 24, 20:50 UTCMay 24, 21:45 UTC55m
2026-05-24 DAL243 TLV → BOS May 24, 10:05 UTCMay 24, 17:06 UTC7h 1m
2026-05-24 DAL243 TLV → BOS May 24, 10:10 UTCMay 24, 11:50 UTC1h 40m
2026-05-23 DAL142 SEA → AMS May 23, 22:15 UTCMay 23, 23:25 UTC1h 10m
2026-05-23 DAL142 SEA → AMS May 23, 22:15 UTCMay 24, 07:15 UTC9h 0m
2026-05-23 DAL143 FRA → DTW May 23, 08:40 UTCMay 23, 13:50 UTC5h 10m
2026-05-23 DAL143 FRA → DTW May 23, 08:35 UTCMay 23, 18:15 UTC9h 40m
2026-05-22 DAL242 BOS → TLV May 22, 23:55 UTCMay 23, 05:45 UTC5h 49m
2026-05-22 DAL63 FCO → ATL May 22, 13:05 UTCMay 22, 14:00 UTC55m
2026-05-22 DAL63 FCO → ATL May 22, 13:00 UTCMay 22, 20:30 UTC7h 30m
2026-05-22 DAL108 ATL → MAD May 22, 01:55 UTCMay 22, 09:40 UTC7h 45m
2026-05-21 DAL67 FCO → ATL May 21, 11:25 UTCMay 21, 12:00 UTC35m
2026-05-21 DAL67 FCO → ATL May 21, 11:20 UTCMay 21, 21:43 UTC10h 23m
2026-05-20 DAL66 ATL → FCO May 20, 23:25 UTCMay 21, 06:00 UTC6h 35m
2026-05-20 DAL66 ATL → FCO May 20, 23:23 UTCMay 21, 08:31 UTC9h 8m
2026-05-20 DAL146 SCL → ATL May 20, 05:15 UTCMay 20, 11:55 UTC6h 40m
2026-05-19 DAL147 ATL → SCL May 19, 02:25 UTCMay 19, 08:05 UTC5h 40m
2026-05-18 DAL223 ATH → ATL May 18, 13:55 UTCMay 18, 14:55 UTC1h 0m
2026-05-18 DAL223 ATH → ATL May 18, 13:54 UTCMay 18, 21:45 UTC7h 51m
2026-05-18 DAL223 ATH → ATL May 18, 07:00 UTCMay 18, 11:55 UTC4h 55m
2026-05-17 DAL240 BOS → ATH May 17, 19:45 UTCMay 18, 04:11 UTC8h 25m
2026-05-17 DAL59 LHR → BOS May 17, 09:05 UTCMay 17, 16:01 UTC6h 55m
2026-05-16 DAL16 DTW → LHR May 16, 22:50 UTCMay 17, 05:45 UTC6h 55m
2026-05-16 DAL17 LHR → DTW May 16, 10:20 UTCMay 16, 18:05 UTC7h 45m
2026-05-16 DAL58 BOS → LHR May 16, 00:10 UTCMay 16, 06:06 UTC5h 56m
2026-05-15 DAL63 FCO → ATL May 15, 12:55 UTCMay 15, 20:21 UTC7h 26m
2026-05-15 DAL63 FCO → ATL May 15, 12:55 UTCMay 15, 14:10 UTC1h 15m
2026-05-15 DAL108 ATL → MAD May 15, 02:02 UTCMay 15, 09:42 UTC7h 40m
2026-05-15 DAL108 ATL → MAD May 15, 02:05 UTCMay 15, 05:00 UTC2h 55m
2026-05-14 DAL215 FCO → ATL May 14, 16:25 UTCMay 14, 19:05 UTC2h 40m
2026-05-14 DAL215 FCO → ATL May 14, 16:05 UTCMay 14, 16:20 UTC15m
2026-05-14 DAL215 FCO → ATL May 14, 08:35 UTCMay 14, 16:00 UTC7h 25m
2026-05-14 DAL215 FCO → ATL May 14, 08:35 UTCMay 14, 18:55 UTC10h 20m
2026-05-13 DAL214 ATL → FCO May 13, 20:10 UTCMay 14, 05:10 UTC9h 0m
2026-05-13 DAL214 ATL → FCO May 13, 20:08 UTCMay 14, 05:08 UTC9h 0m
2026-05-13 DAL720 MSP → MSO May 13, 06:55 UTCMay 13, 10:15 UTC3h 20m

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 N437DX page for operator, model, and routing details .

Mode-S A53D80 frequently asked

What is Mode-S code A53D80?
A53D80 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N437DX.
Where is Mode-S A53D80 registered?
Mode-S code A53D80 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 A53D80 broadcasting right now?
No active broadcast right now. Last signal was 40m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53D80, octal 51236600, decimal 10,829,184.
What flights does A53D80 operate?
Mode-S A53D80 has broadcast 20 distinct callsigns, including DAL951, DAL742, DAL9, DAL67, DAL215.