Apparatus

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sensors Mode-S transponder

A4A484

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N399DA · BOEING 737-800 · operated by DELTA AIR LINES INC

Hex
A4A484
Octal
51122204
Decimal
10,790,020
Country
US
Tail
N399DA
Type
B738
Broadcasting now · callsign DAL2377 · 35,000 ft
Flights observed
452
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Current position

A4A484 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4A484 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
DAL760 - 10 2026-07-10
DAL2824 - 10 2026-07-19
DAL2613 - 9 2026-07-16
DAL2196 - 8 2026-07-04
DAL2508 - 7 2026-07-15
DAL873 Delta Air Lines 6 2026-06-11
DAL2442 - 5 2026-07-15
DAL2393 - 5 2026-07-11
DAL1595 Delta Air Lines 5 2026-05-05
DAL1279 Delta Air Lines 5 2026-05-02
DAL588 Delta Air Lines 4 2026-05-14
DAL449 Delta Air Lines 4 2026-04-21
DAL306 - 4 2026-06-28
DAL2993 - 4 2026-06-29
DAL2876 - 4 2026-07-19
DAL2515 Delta Air Lines 4 2026-07-21
DAL2200 - 4 2026-06-16
DAL2197 Delta Air Lines 4 2026-04-25
DAL1680 Delta Air Lines 4 2026-04-23
DAL1439 - 4 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1431 LAX → SFO Jul 26, 20:30 UTCJul 26, 21:40 UTC1h 10m
2026-07-26 DAL1431 LAX → SFO Jul 26, 17:40 UTCJul 26, 18:55 UTC1h 15m
2026-07-26 DAL432 LGA → DFW Jul 26, 11:20 UTCJul 26, 15:20 UTC4h 0m
2026-07-25 DAL847 PHX → JFK Jul 25, 20:00 UTCJul 25, 23:30 UTC3h 30m
2026-07-25 DAL1016 ATL → MDW Jul 25, 16:45 UTCJul 25, 18:15 UTC1h 30m
2026-07-25 DAL780 AUS → SEA Jul 25, 11:20 UTCJul 25, 15:00 UTC3h 40m
2026-07-25 DAL848 LGA → ATL Jul 25, 03:40 UTCJul 25, 07:15 UTC3h 35m
2026-07-24 DAL2606 MSP → EWR Jul 24, 23:25 UTCJul 25, 01:20 UTC1h 55m
2026-07-24 DAL2769 ATL → EWR Jul 24, 20:05 UTCJul 24, 22:25 UTC2h 20m
2026-07-24 DAL1605 JFK → TPA Jul 24, 15:25 UTCJul 24, 17:30 UTC2h 5m
2026-07-24 DAL2169 PBI → BOS Jul 24, 00:05 UTCJul 24, 02:10 UTC2h 5m
2026-07-24 DAL2169 PBI → BOS Jul 24, 00:02 UTCJul 24, 02:13 UTC2h 11m
2026-07-23 DAL1564 PHL → ATL Jul 23, 18:20 UTCJul 23, 22:20 UTC4h 0m
2026-07-23 DAL1564 PHL → ATL Jul 23, 18:18 UTCJul 23, 22:15 UTC3h 57m
2026-07-23 DAL2247 DTW → MSN Jul 23, 14:00 UTCJul 23, 16:35 UTC2h 35m
2026-07-23 DAL2247 DTW → MSN Jul 23, 13:59 UTCJul 23, 16:30 UTC2h 31m
2026-07-22 DAL2468 BOS → JFK Jul 22, 22:10 UTCJul 23, 02:05 UTC3h 55m
2026-07-22 DAL2477 SLC → YYZ Jul 22, 17:05 UTCJul 22, 20:15 UTC3h 10m
2026-07-22 DAL2477 SLC → YYZ Jul 22, 17:04 UTCJul 22, 20:09 UTC3h 5m
2026-07-22 DAL2290 - Jul 22, 12:25 UTCJul 22, 15:10 UTC2h 45m
2026-07-21 DAL2515 BOS → BNA Jul 21, 19:50 UTCJul 21, 22:20 UTC2h 30m
2026-07-21 DAL1447 DTW → PHL Jul 21, 16:55 UTCJul 21, 18:05 UTC1h 10m
2026-07-21 DAL1447 DTW → PHL Jul 21, 14:20 UTCJul 21, 15:30 UTC1h 10m
2026-07-21 DAL2376 LGA → BOS Jul 21, 01:50 UTCJul 21, 04:50 UTC3h 0m
2026-07-20 DAL2879 ATL → ORD Jul 20, 22:10 UTCJul 20, 23:55 UTC1h 44m
2026-07-20 DAL3060 GSO → ATL Jul 20, 19:55 UTCJul 20, 20:40 UTC45m
2026-07-20 DAL3060 GSO → ATL Jul 20, 17:10 UTCJul 20, 18:00 UTC50m
2026-07-20 DAL2232 DTW → GSP Jul 20, 14:15 UTCJul 20, 15:10 UTC55m
2026-07-20 DAL2232 DTW → GSP Jul 20, 12:15 UTCJul 20, 13:00 UTC45m
2026-07-20 DAL2441 PHL → DTW Jul 20, 09:45 UTCJul 20, 10:45 UTC1h 0m
2026-07-19 DAL2824 MCO → CVG Jul 19, 23:51 UTCJul 20, 01:39 UTC1h 48m
2026-07-19 DAL2824 MCO → CVG Jul 19, 23:55 UTCJul 20, 01:40 UTC1h 45m
2026-07-19 DAL2824 - Jul 19, 20:10 UTCJul 19, 21:55 UTC1h 45m
2026-07-19 DAL2273 BOS → RDU Jul 19, 15:55 UTCJul 19, 18:55 UTC3h 0m
2026-07-19 DAL2273 BOS → RDU Jul 19, 15:54 UTCJul 19, 18:50 UTC2h 56m
2026-07-19 DAL2876 - Jul 19, 11:25 UTCJul 19, 14:30 UTC3h 5m
2026-07-19 DAL2876 CVG → SLC Jul 19, 11:22 UTCJul 19, 14:26 UTC3h 4m
2026-07-18 DAL2291 BOS → MCO Jul 18, 23:40 UTCJul 19, 02:50 UTC3h 10m
2026-07-18 DAL2291 BOS → MCO Jul 18, 23:40 UTCJul 19, 02:48 UTC3h 8m
2026-07-18 DAL1452 GEG → SLC Jul 18, 20:40 UTCJul 18, 22:05 UTC1h 25m
2026-07-18 DAL1452 SLC → GEG Jul 18, 17:50 UTCJul 18, 19:05 UTC1h 15m
2026-07-18 DAL2231 - Jul 18, 13:15 UTCJul 18, 15:55 UTC2h 40m
2026-07-18 DAL2108 JFK → PBI Jul 18, 01:05 UTCJul 18, 04:25 UTC3h 21m
2026-07-17 DAL2817 - Jul 17, 22:00 UTCJul 17, 23:35 UTC1h 35m
2026-07-17 DAL2817 SLC → SEA Jul 17, 21:58 UTCJul 17, 23:37 UTC1h 39m
2026-07-17 DAL1265 SEA → SLC Jul 17, 19:02 UTCJul 17, 20:35 UTC1h 33m
2026-07-17 DAL1265 SEA → SLC Jul 17, 19:05 UTCJul 17, 20:44 UTC1h 40m
2026-07-17 DAL1605 - Jul 17, 15:29 UTCJul 17, 17:35 UTC2h 5m
2026-07-17 DAL2169 - Jul 17, 01:25 UTCJul 17, 03:20 UTC1h 55m
2026-07-16 DAL2613 - Jul 16, 02:20 UTCJul 16, 04:25 UTC2h 5m

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 N399DA page for operator, model, and routing details .

Mode-S A4A484 frequently asked

What is Mode-S code A4A484?
A4A484 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N399DA.
Where is Mode-S A4A484 registered?
Mode-S code A4A484 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 A4A484 broadcasting right now?
Yes. Mode-S A4A484 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4A484, octal 51122204, decimal 10,790,020.
What flights does A4A484 operate?
Mode-S A4A484 has broadcast 20 distinct callsigns, including DAL760, DAL2824, DAL2613, DAL2196, DAL2508.