Apparatus

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sensors Mode-S transponder

AD9DB8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N977AT · BOEING 717-200 · operated by DELTA AIR LINES INC

Hex
AD9DB8
Octal
53316670
Decimal
11,378,104
Country
US
Tail
N977AT
Type
B712
No current signal · last broadcast Jul 26, 20:15 UTC
Flights observed
396
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:15 UTC

Last known position

Most recent position reported by Mode-S AD9DB8.

Country allocation

The ICAO 24-bit address AD9DB8 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
DAL1155 - 8 2026-07-11
DAL2044 - 7 2026-07-18
DAL3030 - 6 2026-07-02
DAL2944 - 6 2026-07-17
DAL909 Delta Air Lines 5 2026-07-24
DAL426 Delta Air Lines 5 2026-07-23
DAL3077 - 5 2026-06-29
DAL3011 - 5 2026-07-17
DAL2857 Delta Air Lines 5 2026-07-18
DAL2814 Delta Air Lines 5 2026-07-22
DAL2571 - 5 2026-07-13
DAL2563 - 5 2026-07-09
DAL2364 Delta Air Lines 5 2026-07-01
DAL1868 - 5 2026-07-16
DAL1716 Delta Air Lines 5 2026-07-26
DAL1182 - 5 2026-07-16
DAL1119 Delta Air Lines 5 2026-07-24
DAL731 Delta Air Lines 4 2026-07-19
DAL3111 - 4 2026-07-07
DAL3031 - 4 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1716 ATL → RDU Jul 26, 19:25 UTCJul 26, 20:00 UTC35m
2026-07-26 DAL1716 ATL → RDU Jul 26, 19:25 UTCJul 26, 20:19 UTC54m
2026-07-26 DAL1716 ATL → RDU Jul 26, 17:05 UTCJul 26, 18:00 UTC55m
2026-07-26 DAL2566 DTW → EWR Jul 26, 14:35 UTCJul 26, 15:50 UTC1h 15m
2026-07-26 DAL2566 DTW → EWR Jul 26, 12:20 UTCJul 26, 13:30 UTC1h 10m
2026-07-25 DAL2028 SLC → SJC Jul 25, 21:10 UTCJul 25, 22:55 UTC1h 45m
2026-07-25 DAL2028 SLC → SJC Jul 25, 18:15 UTCJul 25, 19:50 UTC1h 35m
2026-07-25 DAL2868 ATL → SDF Jul 25, 15:35 UTCJul 25, 16:40 UTC1h 5m
2026-07-25 DAL2868 ATL → SDF Jul 25, 13:00 UTCJul 25, 14:20 UTC1h 20m
2026-07-25 DAL2601 BWI → DTW Jul 25, 10:20 UTCJul 25, 11:25 UTC1h 5m
2026-07-25 DAL2601 BWI → DTW Jul 25, 10:15 UTCJul 25, 11:25 UTC1h 10m
2026-07-25 DAL2715 DTW → BWI Jul 25, 01:50 UTCJul 25, 02:50 UTC1h 0m
2026-07-24 DAL1621 SFO → JFK Jul 24, 21:20 UTCJul 24, 22:40 UTC1h 20m
2026-07-24 DAL1621 SFO → JFK Jul 24, 18:40 UTCJul 24, 20:05 UTC1h 25m
2026-07-24 DAL909 MSP → BOS Jul 24, 15:55 UTCJul 24, 17:30 UTC1h 35m
2026-07-24 DAL1119 MCO → CVG Jul 24, 13:10 UTCJul 24, 14:45 UTC1h 35m
2026-07-24 DAL1119 MCO → CVG Jul 24, 13:05 UTCJul 24, 14:43 UTC1h 38m
2026-07-24 DAL2596 PHL → ATL Jul 24, 10:15 UTCJul 24, 11:40 UTC1h 25m
2026-07-24 DAL2596 PHL → ATL Jul 24, 10:13 UTCJul 24, 11:31 UTC1h 18m
2026-07-24 DAL2609 ATL → BOS Jul 24, 02:35 UTCJul 24, 03:45 UTC1h 10m
2026-07-23 DAL2761 DTW → MCI Jul 23, 22:55 UTCJul 24, 00:20 UTC1h 25m
2026-07-23 DAL2761 DTW → MCI Jul 23, 20:10 UTCJul 23, 21:40 UTC1h 30m
2026-07-23 DAL426 CMH → ATL Jul 23, 16:40 UTCJul 23, 18:00 UTC1h 20m
2026-07-23 DAL426 CMH → ATL Jul 23, 16:37 UTCJul 23, 18:09 UTC1h 32m
2026-07-23 DAL426 CMH → ATL Jul 23, 14:10 UTCJul 23, 15:30 UTC1h 20m
2026-07-23 DAL876 ATL → LGA Jul 23, 11:20 UTCJul 23, 12:35 UTC1h 15m
2026-07-23 DAL1561 RSW → CVG Jul 23, 00:20 UTCJul 23, 01:30 UTC1h 10m
2026-07-22 DAL2814 BOS → BNA Jul 22, 21:25 UTCJul 22, 22:55 UTC1h 30m
2026-07-22 DAL2814 BOS → BNA Jul 22, 21:19 UTCJul 22, 22:51 UTC1h 32m
2026-07-22 DAL2814 BOS → BNA Jul 22, 18:45 UTCJul 22, 19:55 UTC1h 10m
2026-07-22 DAL909 MSP → BOS Jul 22, 16:00 UTCJul 22, 17:40 UTC1h 40m
2026-07-22 DAL1119 MCO → CVG Jul 22, 13:10 UTCJul 22, 14:50 UTC1h 40m
2026-07-22 DAL1405 - Jul 22, 11:10 UTCJul 22, 11:35 UTC25m
2026-07-22 DAL2352 DTW → CLT Jul 22, 01:10 UTCJul 22, 02:25 UTC1h 15m
2026-07-22 DAL2352 DTW → CLT Jul 22, 01:08 UTCJul 22, 02:20 UTC1h 12m
2026-07-21 DAL426 - Jul 21, 17:30 UTCJul 21, 19:05 UTC1h 35m
2026-07-21 DAL426 - Jul 21, 14:10 UTCJul 21, 15:30 UTC1h 20m
2026-07-21 DAL1626 MSP → MSY Jul 21, 11:40 UTCJul 21, 12:45 UTC1h 5m
2026-07-21 DAL1541 FLL → LGA Jul 21, 00:15 UTCJul 21, 01:25 UTC1h 10m
2026-07-20 DAL909 MSP → BOS Jul 20, 17:10 UTCJul 20, 18:45 UTC1h 35m
2026-07-20 DAL909 MSP → BOS Jul 20, 17:07 UTCJul 20, 18:43 UTC1h 36m
2026-07-20 DAL1119 MCO → CVG Jul 20, 14:00 UTCJul 20, 15:30 UTC1h 30m
2026-07-20 DAL1430 - Jul 20, 01:10 UTCJul 20, 02:20 UTC1h 10m
2026-07-20 DAL1430 CLT → DTW Jul 20, 01:05 UTCJul 20, 02:17 UTC1h 12m
2026-07-19 DAL3031 - Jul 19, 22:45 UTCJul 19, 23:25 UTC40m
2026-07-19 DAL3031 ATL → CLT Jul 19, 22:44 UTCJul 19, 23:23 UTC39m
2026-07-19 DAL731 BOS → FLL Jul 19, 19:50 UTCJul 19, 20:40 UTC50m
2026-07-19 DAL731 BOS → FLL Jul 19, 17:00 UTCJul 19, 17:50 UTC50m
2026-07-19 DAL1010 DFW → DTW Jul 19, 14:55 UTCJul 19, 15:30 UTC35m
2026-07-19 DAL1010 DFW → DTW Jul 19, 12:35 UTCJul 19, 13:10 UTC35m

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 N977AT page for operator, model, and routing details .

Mode-S AD9DB8 frequently asked

What is Mode-S code AD9DB8?
AD9DB8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N977AT.
Where is Mode-S AD9DB8 registered?
Mode-S code AD9DB8 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 AD9DB8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD9DB8, octal 53316670, decimal 11,378,104.
What flights does AD9DB8 operate?
Mode-S AD9DB8 has broadcast 20 distinct callsigns, including DAL1155, DAL2044, DAL3030, DAL2944, DAL909.