Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4BF95

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405DX · AIRBUS A-330-900 · operated by BANK OF UTAH TRUSTEE

Hex
A4BF95
Octal
51137625
Decimal
10,796,949
Country
US
Tail
N405DX
Type
A339
Transponder active on ground
Flights observed
286
Distinct callsigns
20
Country
US
Last broadcast
10m ago

Last known position

Most recent position reported by Mode-S A4BF95.

Country allocation

The ICAO 24-bit address A4BF95 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
DAL220 - 12 2026-07-12
DAL223 - 11 2026-06-29
DAL57 - 10 2026-07-12
DAL74 - 9 2026-07-10
DAL256 - 9 2026-07-13
DAL240 Delta Air Lines 9 2026-06-28
DAL225 - 9 2026-07-13
DAL142 Delta Air Lines 9 2026-06-25
DAL75 Delta Air Lines 8 2026-04-17
DAL67 Delta Air Lines 8 2026-06-13
DAL243 - 8 2026-07-10
DAL143 - 8 2026-06-25
DAL66 - 7 2026-06-12
DAL242 - 7 2026-06-24
DAL17 - 7 2026-07-11
DAL108 - 7 2026-07-01
DAL80 Delta Air Lines 6 2026-06-01
DAL117 Delta Air Lines 6 2026-05-30
DAL81 Delta Air Lines 5 2026-06-01
DAL63 Delta Air Lines 5 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 DAL256 BOS → AMS Jul 13, 20:54 UTCJul 14, 03:19 UTC6h 25m
2026-07-13 DAL256 - Jul 13, 20:55 UTCJul 13, 22:05 UTC1h 10m
2026-07-13 DAL225 - Jul 13, 10:15 UTCJul 13, 17:10 UTC6h 55m
2026-07-12 DAL220 - Jul 12, 22:00 UTCJul 13, 07:15 UTC9h 15m
2026-07-12 DAL57 - Jul 12, 09:30 UTCJul 12, 19:15 UTC9h 45m
2026-07-11 DAL132 - Jul 11, 20:35 UTCJul 11, 22:40 UTC2h 5m
2026-07-11 DAL132 DTW → AMS Jul 11, 20:35 UTCJul 12, 03:48 UTC7h 13m
2026-07-11 DAL17 - Jul 11, 10:00 UTCJul 11, 11:20 UTC1h 20m
2026-07-11 DAL17 LHR → DTW Jul 11, 09:58 UTCJul 11, 17:40 UTC7h 42m
2026-07-11 DAL17 LHR → DTW Jul 11, 09:58 UTCJul 11, 17:36 UTC7h 38m
2026-07-10 DAL58 - Jul 10, 23:25 UTCJul 11, 05:25 UTC6h 0m
2026-07-10 DAL243 AMS → BOS Jul 10, 10:45 UTCJul 10, 18:10 UTC7h 25m
2026-07-10 DAL74 ATL → AMS Jul 10, 00:20 UTCJul 10, 08:15 UTC7h 55m
2026-07-09 DAL109 MAD → ATL Jul 9, 08:10 UTCJul 9, 17:05 UTC8h 55m
2026-07-08 DAL62 BOS → MAD Jul 8, 21:53 UTCJul 9, 04:33 UTC6h 40m
2026-07-08 DAL62 - Jul 8, 21:55 UTCJul 9, 04:20 UTC6h 25m
2026-07-08 DAL125 LIS → BOS Jul 8, 12:55 UTCJul 8, 19:15 UTC6h 20m
2026-07-08 DAL124 BOS → LIS Jul 8, 04:45 UTCJul 8, 10:35 UTC5h 50m
2026-07-08 DAL124 BOS → LIS Jul 8, 04:42 UTCJul 8, 10:37 UTC5h 55m
2026-07-07 DAL243 AMS → BOS Jul 7, 09:50 UTCJul 7, 17:15 UTC7h 25m
2026-07-07 DAL243 AMS → BOS Jul 7, 09:47 UTCJul 7, 17:10 UTC7h 23m
2026-07-06 DAL134 - Jul 6, 22:50 UTCJul 7, 05:45 UTC6h 55m
2026-07-06 DAL133 AMS → DTW Jul 6, 07:40 UTCJul 6, 15:45 UTC8h 5m
2026-07-06 DAL133 AMS → DTW Jul 6, 07:39 UTCJul 6, 15:39 UTC8h 0m
2026-07-05 DAL256 BOS → AMS Jul 5, 21:01 UTCJul 6, 02:54 UTC5h 53m
2026-07-05 DAL256 - Jul 5, 21:05 UTCJul 6, 02:55 UTC5h 50m
2026-07-05 DAL225 - Jul 5, 10:30 UTCJul 5, 17:50 UTC7h 20m
2026-07-04 DAL220 SLC → CDG Jul 4, 21:55 UTCJul 5, 00:00 UTC2h 5m
2026-07-04 DAL220 SLC → CDG Jul 4, 21:52 UTCJul 5, 07:21 UTC9h 29m
2026-07-04 DAL57 - Jul 4, 09:15 UTCJul 4, 10:50 UTC1h 35m
2026-07-04 DAL57 AMS → SLC Jul 4, 09:13 UTCJul 4, 18:56 UTC9h 43m
2026-07-03 DAL132 - Jul 3, 20:55 UTCJul 3, 22:55 UTC2h 0m
2026-07-03 DAL132 DTW → AMS Jul 3, 20:52 UTCJul 4, 03:49 UTC6h 57m
2026-07-03 DAL133 AMS → DTW Jul 3, 07:50 UTCJul 3, 16:10 UTC8h 20m
2026-07-02 DAL132 - Jul 2, 20:45 UTCJul 3, 03:35 UTC6h 50m
2026-07-02 DAL17 LHR → DTW Jul 2, 10:00 UTCJul 2, 11:15 UTC1h 15m
2026-07-02 DAL17 LHR → DTW Jul 2, 10:00 UTCJul 2, 17:56 UTC7h 56m
2026-07-02 DAL17 LHR → DTW Jul 2, 10:00 UTCJul 2, 17:59 UTC7h 59m
2026-07-01 DAL58 BOS → LHR Jul 1, 23:25 UTCJul 2, 05:35 UTC6h 10m
2026-07-01 DAL63 FCO → ATL Jul 1, 12:55 UTCJul 1, 19:50 UTC6h 55m
2026-07-01 DAL108 - Jul 1, 01:55 UTCJul 1, 04:00 UTC2h 5m
2026-07-01 DAL108 ATL → MAD Jul 1, 01:54 UTCJul 1, 09:59 UTC8h 5m
2026-06-30 DAL55 - Jun 30, 05:20 UTCJun 30, 22:45 UTC17h 25m
2026-06-29 DAL54 - Jun 29, 21:39 UTCJun 30, 14:45 UTC17h 6m
2026-06-29 DAL223 - Jun 29, 06:59 UTCJun 29, 11:10 UTC4h 10m
2026-06-29 DAL223 ATH → ATL Jun 29, 06:58 UTCJun 29, 18:16 UTC11h 18m
2026-06-28 DAL240 BOS → ATH Jun 28, 19:40 UTCJun 29, 04:05 UTC8h 25m
2026-06-28 DAL240 BOS → ATH Jun 28, 19:44 UTCJun 29, 01:14 UTC5h 30m
2026-06-28 DAL243 - Jun 28, 09:50 UTCJun 28, 11:29 UTC1h 40m
2026-06-28 DAL243 AMS → BOS Jun 28, 09:48 UTCJun 28, 16:55 UTC7h 7m

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 N405DX page for operator, model, and routing details .

Mode-S A4BF95 frequently asked

What is Mode-S code A4BF95?
A4BF95 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405DX.
Where is Mode-S A4BF95 registered?
Mode-S code A4BF95 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 A4BF95 broadcasting right now?
Mode-S A4BF95 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BF95, octal 51137625, decimal 10,796,949.
What flights does A4BF95 operate?
Mode-S A4BF95 has broadcast 20 distinct callsigns, including DAL220, DAL223, DAL57, DAL74, DAL256.