Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A519B8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N428DX · operated by DELTA AIR LINES INC

Hex
A519B8
Octal
51214670
Decimal
10,820,024
Country
US
Tail
N428DX
Type
A339
No current signal · last broadcast Jul 26, 20:10 UTC
Flights observed
309
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Last known position

Most recent position reported by Mode-S A519B8.

Country allocation

The ICAO 24-bit address A519B8 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
DAL57 - 12 2026-07-11
DAL220 - 10 2026-07-11
DAL81 Delta Air Lines 9 2026-06-09
DAL272 Delta Air Lines 9 2026-07-21
DAL225 - 9 2026-07-12
DAL21 Delta Air Lines 9 2026-06-10
DAL80 Delta Air Lines 8 2026-06-09
DAL273 Delta Air Lines 8 2026-07-21
DAL256 - 8 2026-07-12
DAL142 - 8 2026-07-10
DAL237 - 7 2026-07-06
DAL213 Delta Air Lines 7 2026-07-22
DAL212 Delta Air Lines 7 2026-07-22
DAL145 Delta Air Lines 7 2026-06-07
DAL9 Delta Air Lines 6 2026-07-26
DAL62 Delta Air Lines 6 2026-06-28
DAL236 - 6 2026-07-07
DAL20 Delta Air Lines 6 2026-06-10
DAL143 - 6 2026-07-10
DAL124 - 6 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL9 LHR → ATL Jul 26, 11:50 UTCJul 26, 20:00 UTC8h 10m
2026-07-26 DAL9 LHR → ATL Jul 26, 11:48 UTCJul 26, 20:07 UTC8h 19m
2026-07-26 DAL3 JFK → LHR Jul 26, 03:15 UTCJul 26, 09:25 UTC6h 11m
2026-07-26 DAL3 JFK → LHR Jul 26, 03:12 UTCJul 26, 09:21 UTC6h 9m
2026-07-25 DAL185 MXP → JFK Jul 25, 13:34 UTCJul 25, 21:32 UTC7h 58m
2026-07-25 DAL185 MXP → JFK Jul 25, 13:35 UTCJul 25, 15:35 UTC2h 0m
2026-07-25 DAL184 JFK → MXP Jul 25, 03:01 UTCJul 25, 10:26 UTC7h 25m
2026-07-25 DAL184 JFK → MXP Jul 25, 03:05 UTCJul 25, 04:00 UTC55m
2026-07-24 DAL972 BDL → ATL Jul 24, 19:05 UTCJul 24, 23:50 UTC4h 45m
2026-07-24 DAL972 BDL → ATL Jul 24, 19:02 UTCJul 24, 23:54 UTC4h 52m
2026-07-24 DAL742 LGA → MSP Jul 24, 11:15 UTCJul 24, 16:40 UTC5h 25m
2026-07-23 DAL972 BDL → ATL Jul 23, 18:40 UTCJul 23, 23:25 UTC4h 45m
2026-07-23 DAL742 LGA → MSP Jul 23, 11:20 UTCJul 23, 16:35 UTC5h 15m
2026-07-22 DAL213 ATH → JFK Jul 22, 14:50 UTCJul 23, 00:40 UTC9h 50m
2026-07-22 DAL213 ATH → JFK Jul 22, 14:55 UTCJul 23, 00:45 UTC9h 50m
2026-07-22 DAL212 JFK → ATH Jul 22, 03:20 UTCJul 22, 12:24 UTC9h 4m
2026-07-22 DAL212 JFK → ATH Jul 22, 03:25 UTCJul 22, 12:30 UTC9h 5m
2026-07-21 DAL273 LIS → JFK Jul 21, 09:15 UTCJul 21, 15:50 UTC6h 35m
2026-07-21 DAL272 JFK → LIS Jul 21, 00:40 UTCJul 21, 07:04 UTC6h 24m
2026-07-21 DAL272 JFK → LIS Jul 21, 00:45 UTCJul 21, 07:00 UTC6h 15m
2026-07-20 DAL157 ACC → JFK Jul 20, 11:50 UTCJul 20, 19:55 UTC8h 5m
2026-07-20 DAL157 ACC → JFK Jul 20, 09:52 UTCJul 20, 19:44 UTC9h 52m
2026-07-19 DAL156 JFK → ACC Jul 19, 21:03 UTCJul 20, 06:35 UTC9h 32m
2026-07-19 DAL156 JFK → ACC Jul 19, 21:05 UTCJul 19, 21:45 UTC40m
2026-07-18 DAL226 - Jul 18, 23:35 UTCJul 19, 00:15 UTC40m
2026-07-18 DAL226 GRU → JFK Jul 18, 23:33 UTCJul 19, 08:36 UTC9h 3m
2026-07-18 DAL227 JFK → GRU Jul 18, 02:29 UTCJul 18, 11:41 UTC9h 12m
2026-07-18 DAL227 - Jul 18, 02:29 UTCJul 18, 11:45 UTC9h 16m
2026-07-17 DAL4 - Jul 17, 15:35 UTCJul 17, 22:29 UTC6h 55m
2026-07-17 DAL10 MSP → LHR Jul 17, 04:49 UTCJul 17, 12:50 UTC8h 0m
2026-07-16 DAL165 AMS → MSP Jul 16, 13:00 UTCJul 16, 21:03 UTC8h 3m
2026-07-16 DAL165 AMS → MSP Jul 16, 13:00 UTCJul 16, 21:07 UTC8h 7m
2026-07-16 DAL165 - Jul 16, 13:05 UTCJul 16, 14:00 UTC55m
2026-07-15 DAL56 SLC → AMS Jul 15, 22:40 UTCJul 16, 07:55 UTC9h 15m
2026-07-15 DAL56 SLC → AMS Jul 15, 22:39 UTCJul 16, 07:49 UTC9h 10m
2026-07-15 DAL221 - Jul 15, 09:40 UTCJul 15, 19:40 UTC10h 0m
2026-07-14 DAL224 BOS → CDG Jul 14, 23:37 UTCJul 15, 06:20 UTC6h 43m
2026-07-14 DAL224 BOS → CDG Jul 14, 23:40 UTCJul 15, 06:20 UTC6h 40m
2026-07-14 DAL59 - Jul 14, 09:00 UTCJul 14, 15:25 UTC6h 25m
2026-07-14 DAL59 LHR → BOS Jul 14, 08:56 UTCJul 14, 15:22 UTC6h 26m
2026-07-13 DAL16 - Jul 13, 23:15 UTCJul 14, 06:40 UTC7h 25m
2026-07-13 DAL16 DTW → LHR Jul 13, 23:10 UTCJul 14, 06:29 UTC7h 19m
2026-07-13 DAL133 - Jul 13, 13:45 UTCJul 13, 15:40 UTC1h 55m
2026-07-13 DAL133 AMS → DTW Jul 13, 07:49 UTCJul 13, 15:33 UTC7h 44m
2026-07-13 DAL133 - Jul 13, 07:50 UTCJul 13, 13:40 UTC5h 50m
2026-07-12 DAL256 BOS → AMS Jul 12, 21:00 UTCJul 13, 03:21 UTC6h 21m
2026-07-12 DAL256 - Jul 12, 21:00 UTCJul 12, 22:00 UTC1h 0m
2026-07-12 DAL225 - Jul 12, 10:25 UTCJul 12, 17:25 UTC7h 0m
2026-07-12 DAL225 CDG → BOS Jul 12, 10:23 UTCJul 12, 17:26 UTC7h 3m
2026-07-11 DAL220 - Jul 11, 21:55 UTCJul 12, 07:15 UTC9h 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 N428DX page for operator, model, and routing details .

Mode-S A519B8 frequently asked

What is Mode-S code A519B8?
A519B8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N428DX.
Where is Mode-S A519B8 registered?
Mode-S code A519B8 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 A519B8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A519B8, octal 51214670, decimal 10,820,024.
What flights does A519B8 operate?
Mode-S A519B8 has broadcast 20 distinct callsigns, including DAL57, DAL220, DAL81, DAL272, DAL225.