Apparatus

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sensors Mode-S transponder

AD077B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N939DZ · operated by DELTA AIR LINES INC

Hex
AD077B
Octal
53203573
Decimal
11,339,643
Country
US
Tail
N939DZ
Type
B739
No current signal · last broadcast 5h ago
Flights observed
611
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S AD077B.

Country allocation

The ICAO 24-bit address AD077B 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
DAL2867 - 17 2026-07-10
DAL2052 Delta Air Lines 17 2026-07-01
DAL2542 - 15 2026-06-21
DAL880 Delta Air Lines 14 2026-05-31
DAL3054 Delta Air Lines 13 2026-05-31
DAL552 - 12 2026-07-11
DAL2600 Delta Air Lines 12 2026-05-23
DAL1530 Delta Air Lines 12 2026-06-03
DAL1552 Delta Air Lines 11 2026-06-10
DAL3089 Delta Air Lines 10 2026-05-25
DAL2952 - 10 2026-07-03
DAL3126 Delta Air Lines 9 2026-06-29
DAL3035 - 9 2026-07-07
DAL2522 - 9 2026-07-09
DAL3134 Delta Air Lines 8 2026-05-18
DAL2999 Delta Air Lines 8 2026-04-29
DAL2711 Delta Air Lines 8 2026-06-03
DAL2280 - 8 2026-07-06
DAL1481 - 8 2026-07-06
DAL1148 - 8 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 DAL1154 ATL → RDU Jul 14, 02:40 UTCJul 14, 03:35 UTC55m
2026-07-12 DAL851 - Jul 12, 17:15 UTCJul 12, 18:15 UTC1h 0m
2026-07-12 DAL851 MEM → ATL Jul 12, 17:14 UTCJul 12, 18:06 UTC52m
2026-07-12 DAL2937 - Jul 12, 15:01 UTCJul 12, 15:40 UTC40m
2026-07-12 DAL2478 - Jul 12, 11:55 UTCJul 12, 12:55 UTC1h 0m
2026-07-12 DAL2478 RDU → ATL Jul 12, 11:55 UTCJul 12, 12:51 UTC56m
2026-07-12 DAL1097 ATL → RDU Jul 12, 02:05 UTCJul 12, 03:05 UTC1h 0m
2026-07-11 DAL2925 ORF → ATL Jul 11, 23:10 UTCJul 12, 00:30 UTC1h 20m
2026-07-11 DAL2925 ATL → ORF Jul 11, 15:15 UTCJul 11, 16:35 UTC1h 20m
2026-07-11 DAL1534 - Jul 11, 12:10 UTCJul 11, 12:45 UTC35m
2026-07-11 DAL1534 MSY → ATL Jul 11, 12:10 UTCJul 11, 13:11 UTC1h 1m
2026-07-11 DAL2072 ATL → MSY Jul 11, 04:15 UTCJul 11, 05:15 UTC1h 0m
2026-07-11 DAL2072 ATL → MSY Jul 11, 04:15 UTCJul 11, 05:20 UTC1h 5m
2026-07-11 DAL552 - Jul 11, 01:30 UTCJul 11, 02:25 UTC55m
2026-07-11 DAL552 MEM → ATL Jul 11, 01:28 UTCJul 11, 02:23 UTC55m
2026-07-10 DAL552 - Jul 10, 21:30 UTCJul 10, 22:25 UTC55m
2026-07-10 DAL2867 BNA → ATL Jul 10, 18:14 UTCJul 10, 19:05 UTC51m
2026-07-10 DAL2867 BNA → ATL Jul 10, 18:15 UTCJul 10, 19:10 UTC55m
2026-07-10 DAL2867 ATL → BNA Jul 10, 15:40 UTCJul 10, 16:30 UTC50m
2026-07-10 DAL3067 PNS → ATL Jul 10, 13:10 UTCJul 10, 13:55 UTC45m
2026-07-10 DAL2807 ATL → PNS Jul 10, 04:00 UTCJul 10, 04:45 UTC45m
2026-07-10 DAL1393 STL → ATL Jul 10, 01:00 UTCJul 10, 02:10 UTC1h 10m
2026-07-09 DAL1393 ATL → STL Jul 9, 22:30 UTCJul 9, 23:35 UTC1h 5m
2026-07-09 DAL1345 - Jul 9, 18:50 UTCJul 9, 20:10 UTC1h 20m
2026-07-09 DAL1345 - Jul 9, 15:20 UTCJul 9, 16:30 UTC1h 10m
2026-07-09 DAL2522 MSY → ATL Jul 9, 12:35 UTCJul 9, 13:35 UTC1h 0m
2026-07-09 DAL2522 MSY → ATL Jul 9, 12:33 UTCJul 9, 13:36 UTC1h 3m
2026-07-09 DAL2072 ATL → MSY Jul 9, 02:20 UTCJul 9, 03:25 UTC1h 5m
2026-07-08 DAL552 - Jul 8, 23:00 UTCJul 8, 23:55 UTC55m
2026-07-08 DAL552 - Jul 8, 20:35 UTCJul 8, 21:25 UTC50m
2026-07-08 DAL2867 BNA → ATL Jul 8, 18:15 UTCJul 8, 18:50 UTC35m
2026-07-08 DAL2867 ATL → BNA Jul 8, 15:40 UTCJul 8, 16:25 UTC45m
2026-07-08 DAL3067 PNS → ATL Jul 8, 13:05 UTCJul 8, 13:50 UTC45m
2026-07-07 DAL3059 ATL → PNS Jul 7, 23:41 UTCJul 8, 00:19 UTC38m
2026-07-07 DAL3059 ATL → PNS Jul 7, 23:45 UTCJul 8, 00:25 UTC40m
2026-07-07 DAL3195 - Jul 7, 20:55 UTCJul 7, 21:55 UTC1h 0m
2026-07-07 DAL3195 ATL → SDF Jul 7, 18:40 UTCJul 7, 19:30 UTC50m
2026-07-07 DAL3035 DAB → ATL Jul 7, 15:40 UTCJul 7, 16:33 UTC53m
2026-07-07 DAL3035 - Jul 7, 13:05 UTCJul 7, 14:05 UTC1h 0m
2026-07-07 DAL2124 - Jul 7, 10:20 UTCJul 7, 11:05 UTC45m
2026-07-07 DAL2525 - Jul 7, 02:25 UTCJul 7, 03:05 UTC40m
2026-07-06 DAL2280 - Jul 6, 22:35 UTCJul 7, 00:10 UTC1h 35m
2026-07-06 DAL2280 ATL → CMH Jul 6, 19:50 UTCJul 6, 21:00 UTC1h 10m
2026-07-06 DAL1481 - Jul 6, 17:20 UTCJul 6, 18:25 UTC1h 5m
2026-07-06 DAL1481 - Jul 6, 14:40 UTCJul 6, 15:30 UTC50m
2026-07-06 DAL3129 - Jul 6, 12:05 UTCJul 6, 12:50 UTC45m
2026-07-06 DAL3129 PNS → ATL Jul 6, 12:03 UTCJul 6, 12:49 UTC46m
2026-07-06 DAL3021 ATL → PNS Jul 6, 00:42 UTCJul 6, 01:28 UTC46m
2026-07-06 DAL3021 ATL → PNS Jul 6, 00:45 UTCJul 6, 01:40 UTC55m
2026-07-05 DAL2026 - Jul 5, 21:35 UTCJul 5, 22:35 UTC1h 0m

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 N939DZ page for operator, model, and routing details .

Mode-S AD077B frequently asked

What is Mode-S code AD077B?
AD077B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N939DZ.
Where is Mode-S AD077B registered?
Mode-S code AD077B 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 AD077B broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD077B, octal 53203573, decimal 11,339,643.
What flights does AD077B operate?
Mode-S AD077B has broadcast 20 distinct callsigns, including DAL2867, DAL2052, DAL2542, DAL880, DAL3054.