Apparatus

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sensors Mode-S transponder

AD4F0B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N957DZ · operated by DELTA AIR LINES INC

Hex
AD4F0B
Octal
53247413
Decimal
11,357,963
Country
US
Tail
N957DZ
Type
B739
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
683
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S AD4F0B.

Country allocation

The ICAO 24-bit address AD4F0B 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
DAL2542 - 19 2026-07-19
DAL2545 Delta Air Lines 18 2026-05-22
DAL2071 - 18 2026-07-05
DAL1393 - 18 2026-07-20
DAL2978 - 13 2026-06-20
DAL2867 Delta Air Lines 13 2026-07-20
DAL2152 - 13 2026-07-02
DAL2052 - 13 2026-07-17
DAL1699 - 13 2026-07-15
DAL552 - 12 2026-07-20
DAL527 Delta Air Lines 11 2026-07-21
DAL3056 Delta Air Lines 11 2026-07-23
DAL2522 Delta Air Lines 11 2026-07-19
DAL1552 Delta Air Lines 11 2026-07-21
DAL1450 - 11 2026-06-24
DAL1353 Delta Air Lines 11 2026-06-10
DAL3069 - 10 2026-07-10
DAL2952 Delta Air Lines 10 2026-07-26
DAL2850 Delta Air Lines 10 2026-06-02
DAL2026 - 10 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL3195 MDT → ATL Jul 26, 20:55 UTCJul 26, 21:50 UTC55m
2026-07-26 DAL3195 MDT → ATL Jul 26, 18:30 UTCJul 26, 19:20 UTC50m
2026-07-26 DAL2952 ATL → IND Jul 26, 15:40 UTCJul 26, 16:50 UTC1h 10m
2026-07-26 DAL2952 ATL → IND Jul 26, 15:40 UTCJul 26, 16:45 UTC1h 5m
2026-07-26 DAL2952 ATL → IND Jul 26, 13:20 UTCJul 26, 14:30 UTC1h 10m
2026-07-26 DAL1214 SFO → DTW Jul 26, 04:20 UTCJul 26, 05:30 UTC1h 10m
2026-07-26 DAL1214 SFO → DTW Jul 26, 04:16 UTCJul 26, 05:22 UTC1h 6m
2026-07-26 DAL1214 SFO → DTW Jul 26, 01:30 UTCJul 26, 02:35 UTC1h 5m
2026-07-25 DAL940 LAX → TPA Jul 25, 18:05 UTCJul 25, 18:45 UTC40m
2026-07-25 DAL940 LAX → TPA Jul 25, 18:05 UTCJul 25, 18:42 UTC37m
2026-07-25 DAL940 LAX → TPA Jul 25, 15:30 UTCJul 25, 16:10 UTC40m
2026-07-25 DAL2478 BNA → BOS Jul 25, 13:00 UTCJul 25, 14:05 UTC1h 5m
2026-07-25 DAL1518 SRQ → MSP Jul 25, 01:32 UTCJul 25, 02:25 UTC53m
2026-07-25 DAL1518 SRQ → MSP Jul 25, 01:35 UTCJul 25, 02:30 UTC55m
2026-07-24 DAL3195 MDT → ATL Jul 24, 22:40 UTCJul 24, 23:40 UTC1h 0m
2026-07-24 DAL3195 MDT → ATL Jul 24, 22:38 UTCJul 24, 23:36 UTC58m
2026-07-24 DAL3195 MDT → ATL Jul 24, 19:05 UTCJul 24, 20:20 UTC1h 15m
2026-07-24 DAL2952 ATL → IND Jul 24, 15:40 UTCJul 24, 16:55 UTC1h 15m
2026-07-24 DAL2952 ATL → IND Jul 24, 13:20 UTCJul 24, 14:20 UTC1h 0m
2026-07-23 DAL3056 ATL → DAB Jul 23, 23:30 UTCJul 24, 00:25 UTC55m
2026-07-23 DAL3056 ATL → DAB Jul 23, 21:00 UTCJul 23, 21:55 UTC55m
2026-07-22 DAL3126 IND → ATL Jul 22, 22:40 UTCJul 22, 23:45 UTC1h 5m
2026-07-22 DAL3126 IND → ATL Jul 22, 20:05 UTCJul 22, 21:10 UTC1h 5m
2026-07-22 DAL1481 SAN → SEA Jul 22, 17:25 UTCJul 22, 18:30 UTC1h 5m
2026-07-22 DAL1481 SAN → SEA Jul 22, 14:50 UTCJul 22, 15:40 UTC50m
2026-07-22 DAL686 SAV → ATL Jul 22, 12:20 UTCJul 22, 13:00 UTC40m
2026-07-21 DAL527 SAN → BOS Jul 21, 21:55 UTCJul 21, 22:35 UTC40m
2026-07-21 DAL1273 GMU → ATL Jul 21, 19:15 UTCJul 21, 19:50 UTC35m
2026-07-21 DAL1273 - Jul 21, 17:30 UTCJul 21, 17:55 UTC25m
2026-07-21 DAL1571 JFK → LAX Jul 21, 14:25 UTCJul 21, 15:30 UTC1h 5m
2026-07-21 DAL1571 JFK → LAX Jul 21, 11:50 UTCJul 21, 13:05 UTC1h 15m
2026-07-21 DAL1552 IAH → DTW Jul 21, 09:25 UTCJul 21, 10:25 UTC1h 0m
2026-07-21 DAL1154 SLC → SEA Jul 21, 02:10 UTCJul 21, 03:10 UTC1h 0m
2026-07-20 DAL552 - Jul 20, 23:00 UTCJul 21, 00:00 UTC1h 0m
2026-07-20 DAL552 - Jul 20, 20:40 UTCJul 20, 21:35 UTC55m
2026-07-20 DAL2867 ATL → EWR Jul 20, 18:25 UTCJul 20, 19:05 UTC40m
2026-07-20 DAL2867 ATL → EWR Jul 20, 16:20 UTCJul 20, 17:00 UTC40m
2026-07-20 DAL1393 STL → ATL Jul 20, 01:35 UTCJul 20, 02:45 UTC1h 10m
2026-07-19 DAL1393 ATL → STL Jul 19, 22:30 UTCJul 19, 23:55 UTC1h 25m
2026-07-19 DAL2542 MSY → ATL Jul 19, 20:00 UTCJul 19, 21:05 UTC1h 5m
2026-07-19 DAL2542 ATL → MSY Jul 19, 15:10 UTCJul 19, 16:10 UTC1h 0m
2026-07-19 DAL2522 LGA → TPA Jul 19, 12:30 UTCJul 19, 13:40 UTC1h 10m
2026-07-18 DAL3132 ATL → MSY Jul 18, 22:45 UTCJul 18, 23:45 UTC1h 0m
2026-07-18 DAL2547 - Jul 18, 18:05 UTCJul 18, 19:40 UTC1h 35m
2026-07-18 DAL2547 GRR → ATL Jul 18, 18:04 UTCJul 18, 19:40 UTC1h 36m
2026-07-18 DAL2547 ATL → GRR Jul 18, 14:45 UTCJul 18, 16:10 UTC1h 25m
2026-07-18 DAL3129 - Jul 18, 12:05 UTCJul 18, 12:50 UTC45m
2026-07-18 DAL3086 ATL → PNS Jul 18, 02:47 UTCJul 18, 03:40 UTC53m
2026-07-18 DAL3086 - Jul 18, 02:50 UTCJul 18, 03:40 UTC50m
2026-07-17 DAL3152 - Jul 17, 23:05 UTCJul 18, 00:45 UTC1h 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 N957DZ page for operator, model, and routing details .

Mode-S AD4F0B frequently asked

What is Mode-S code AD4F0B?
AD4F0B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N957DZ.
Where is Mode-S AD4F0B registered?
Mode-S code AD4F0B 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 AD4F0B 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 AD4F0B, octal 53247413, decimal 11,357,963.
What flights does AD4F0B operate?
Mode-S AD4F0B has broadcast 20 distinct callsigns, including DAL2542, DAL2545, DAL2071, DAL1393, DAL2978.