Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4F5F0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N419DX · AIRBUS A-330-900 · operated by DELTA AIR LINES INC

Hex
A4F5F0
Octal
51172760
Decimal
10,810,864
Country
US
Tail
N419DX
Type
A339
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
318
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S A4F5F0.

Country allocation

The ICAO 24-bit address A4F5F0 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
DAL59 - 14 2026-07-18
DAL16 Delta Air Lines 13 2026-07-17
DAL221 Delta Air Lines 11 2026-07-22
DAL137 - 11 2026-07-14
DAL224 Delta Air Lines 10 2026-07-22
DAL17 - 10 2026-07-16
DAL223 Delta Air Lines 9 2026-07-19
DAL125 Delta Air Lines 9 2026-07-21
DAL124 Delta Air Lines 9 2026-07-21
DAL80 - 8 2026-07-06
DAL56 Delta Air Lines 8 2026-07-23
DAL243 Delta Air Lines 8 2026-06-08
DAL236 - 8 2026-07-14
DAL112 Delta Air Lines 8 2026-05-04
DAL58 - 7 2026-07-15
DAL257 - 7 2026-07-15
DAL136 - 7 2026-07-15
DAL241 - 6 2026-07-11
DAL240 - 6 2026-07-18
DAL207 Delta Air Lines 6 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL156 JFK → ACC Jul 26, 21:05 UTCJul 26, 21:55 UTC50m
2026-07-26 DAL226 GRU → JFK Jul 26, 02:20 UTCJul 26, 11:50 UTC9h 31m
2026-07-26 DAL226 GRU → JFK Jul 26, 02:17 UTCJul 26, 11:45 UTC9h 28m
2026-07-25 DAL227 JFK → GRU Jul 25, 02:41 UTCJul 25, 11:35 UTC8h 54m
2026-07-25 DAL227 JFK → GRU Jul 25, 02:45 UTCJul 25, 11:40 UTC8h 55m
2026-07-24 DAL4 LHR → JFK Jul 24, 16:00 UTCJul 24, 22:55 UTC6h 55m
2026-07-24 DAL10 MSP → LHR Jul 24, 04:25 UTCJul 24, 11:35 UTC7h 10m
2026-07-24 DAL10 MSP → LHR Jul 24, 04:22 UTCJul 24, 11:30 UTC7h 8m
2026-07-23 DAL165 AMS → MSP Jul 23, 13:15 UTCJul 23, 21:45 UTC8h 30m
2026-07-23 DAL56 SLC → AMS Jul 23, 00:15 UTCJul 23, 09:25 UTC9h 10m
2026-07-22 DAL221 CDG → SLC Jul 22, 11:55 UTCJul 22, 21:50 UTC9h 55m
2026-07-22 DAL224 SEA → AMS Jul 22, 02:22 UTCJul 22, 08:50 UTC6h 28m
2026-07-22 DAL224 SEA → AMS Jul 22, 02:25 UTCJul 22, 03:40 UTC1h 15m
2026-07-21 DAL125 LIS → BOS Jul 21, 12:40 UTCJul 21, 18:55 UTC6h 15m
2026-07-21 DAL124 BOS → LIS Jul 21, 04:05 UTCJul 21, 10:00 UTC5h 55m
2026-07-21 DAL124 BOS → LIS Jul 21, 04:04 UTCJul 21, 10:03 UTC5h 59m
2026-07-20 DAL63 FCO → ATL Jul 20, 13:20 UTCJul 20, 20:25 UTC7h 5m
2026-07-20 DAL108 ATL → MAD Jul 20, 03:05 UTCJul 20, 11:00 UTC7h 55m
2026-07-19 DAL223 ATH → ATL Jul 19, 20:50 UTCJul 19, 21:30 UTC40m
2026-07-19 DAL223 ATH → ATL Jul 19, 20:50 UTCJul 19, 21:34 UTC44m
2026-07-19 DAL223 ATH → ATL Jul 19, 19:00 UTCJul 19, 19:20 UTC20m
2026-07-19 DAL223 ATH → ATL Jul 19, 07:00 UTCJul 19, 10:50 UTC3h 50m
2026-07-19 DAL223 ATH → ATL Jul 19, 07:00 UTCJul 19, 18:45 UTC11h 45m
2026-07-18 DAL240 BOS → ATH Jul 18, 19:51 UTCJul 19, 04:26 UTC8h 35m
2026-07-18 DAL240 BOS → ATH Jul 18, 19:55 UTCJul 19, 04:25 UTC8h 30m
2026-07-18 DAL59 LHR → BOS Jul 18, 10:35 UTCJul 18, 17:10 UTC6h 35m
2026-07-17 DAL16 DTW → LHR Jul 17, 23:05 UTCJul 18, 06:25 UTC7h 21m
2026-07-17 DAL16 DTW → LHR Jul 17, 23:04 UTCJul 18, 06:15 UTC7h 11m
2026-07-17 DAL133 - Jul 17, 07:50 UTCJul 17, 09:20 UTC1h 30m
2026-07-17 DAL133 AMS → DTW Jul 17, 07:45 UTCJul 17, 15:25 UTC7h 40m
2026-07-16 DAL132 - Jul 16, 20:49 UTCJul 17, 04:10 UTC7h 20m
2026-07-16 DAL17 - Jul 16, 10:25 UTCJul 16, 11:40 UTC1h 15m
2026-07-16 DAL17 LHR → DTW Jul 16, 10:23 UTCJul 16, 18:01 UTC7h 38m
2026-07-16 DAL17 LHR → DTW Jul 16, 10:23 UTCJul 16, 17:53 UTC7h 30m
2026-07-15 DAL58 BOS → LHR Jul 15, 23:50 UTCJul 16, 05:50 UTC6h 0m
2026-07-15 DAL257 - Jul 15, 12:55 UTCJul 15, 20:00 UTC7h 5m
2026-07-15 DAL257 AMS → BOS Jul 15, 12:51 UTCJul 15, 19:51 UTC7h 0m
2026-07-15 DAL136 - Jul 15, 02:50 UTCJul 15, 04:55 UTC2h 5m
2026-07-15 DAL136 DTW → AMS Jul 15, 02:47 UTCJul 15, 10:19 UTC7h 32m
2026-07-14 DAL137 - Jul 14, 19:15 UTCJul 14, 21:00 UTC1h 45m
2026-07-14 DAL137 - Jul 14, 13:15 UTCJul 14, 19:05 UTC5h 50m
2026-07-14 DAL236 - Jul 14, 01:55 UTCJul 14, 05:25 UTC3h 30m
2026-07-14 DAL236 TPA → AMS Jul 14, 01:53 UTCJul 14, 10:47 UTC8h 54m
2026-07-13 DAL237 - Jul 13, 13:15 UTCJul 13, 22:35 UTC9h 20m
2026-07-13 DAL237 AMS → TPA Jul 13, 13:10 UTCJul 13, 22:38 UTC9h 28m
2026-07-12 DAL56 - Jul 12, 22:40 UTCJul 13, 00:40 UTC2h 0m
2026-07-12 DAL56 SLC → AMS Jul 12, 22:39 UTCJul 13, 07:45 UTC9h 6m
2026-07-12 DAL221 - Jul 12, 09:45 UTCJul 12, 19:50 UTC10h 5m
2026-07-12 DAL224 BOS → CDG Jul 12, 00:50 UTCJul 12, 07:05 UTC6h 15m
2026-07-11 DAL241 ATH → BOS Jul 11, 12:35 UTCJul 11, 22:15 UTC9h 40m

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 N419DX page for operator, model, and routing details .

Mode-S A4F5F0 frequently asked

What is Mode-S code A4F5F0?
A4F5F0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N419DX.
Where is Mode-S A4F5F0 registered?
Mode-S code A4F5F0 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 A4F5F0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F5F0, octal 51172760, decimal 10,810,864.
What flights does A4F5F0 operate?
Mode-S A4F5F0 has broadcast 20 distinct callsigns, including DAL59, DAL16, DAL221, DAL137, DAL224.