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 1h ago
Flights observed
341
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
DAL3030 - 6 2026-07-02
DAL2944 - 6 2026-07-17
DAL3077 - 5 2026-06-29
DAL3011 - 5 2026-07-17
DAL2857 Delta Air Lines 5 2026-07-18
DAL2571 - 5 2026-07-13
DAL2563 - 5 2026-07-09
DAL2364 Delta Air Lines 5 2026-07-01
DAL1868 - 5 2026-07-16
DAL1182 - 5 2026-07-16
DAL3111 - 4 2026-07-07
DAL2044 - 4 2026-07-13
DAL1665 - 4 2026-06-19
DAL1640 Delta Air Lines 4 2026-06-06
DAL412 - 3 2026-06-20
DAL3202 - 3 2026-07-17
DAL3182 Delta Air Lines 3 2026-05-31
DAL3173 Delta Air Lines 3 2026-07-07
DAL3141 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 DAL2144 SLC → SJC Jul 18, 03:30 UTCJul 18, 04:00 UTC30m
2026-07-18 DAL2857 MSP → ORD Jul 18, 00:25 UTCJul 18, 01:54 UTC1h 30m
2026-07-18 DAL2857 MSP → ORD Jul 18, 00:24 UTCJul 18, 01:55 UTC1h 31m
2026-07-17 DAL2857 MSP → ORD Jul 17, 21:15 UTCJul 17, 22:55 UTC1h 40m
2026-07-17 DAL2944 - Jul 17, 18:00 UTCJul 17, 19:05 UTC1h 5m
2026-07-17 DAL2944 CAE → ATL Jul 17, 17:56 UTCJul 17, 19:10 UTC1h 14m
2026-07-17 DAL2944 - Jul 17, 16:10 UTCJul 17, 16:40 UTC30m
2026-07-17 DAL3011 SAV → ATL Jul 17, 14:15 UTCJul 17, 14:55 UTC40m
2026-07-17 DAL3011 SAV → ATL Jul 17, 14:13 UTCJul 17, 14:54 UTC41m
2026-07-17 DAL3011 ATL → SAV Jul 17, 12:25 UTCJul 17, 13:05 UTC40m
2026-07-17 DAL1979 - Jul 17, 10:25 UTCJul 17, 11:00 UTC35m
2026-07-17 DAL3202 - Jul 17, 01:35 UTCJul 17, 01:59 UTC25m
2026-07-17 DAL3202 ATL → BHM Jul 17, 01:34 UTCJul 17, 01:59 UTC25m
2026-07-16 DAL1868 - Jul 16, 21:50 UTCJul 16, 22:55 UTC1h 5m
2026-07-16 DAL1868 TLH → ATL Jul 16, 21:44 UTCJul 16, 22:38 UTC54m
2026-07-16 DAL1868 - Jul 16, 19:50 UTCJul 16, 20:35 UTC45m
2026-07-16 DAL1182 - Jul 16, 18:10 UTCJul 16, 18:44 UTC35m
2026-07-16 DAL1182 AVL → ATL Jul 16, 18:05 UTCJul 16, 18:36 UTC31m
2026-07-16 DAL1182 - Jul 16, 16:30 UTCJul 16, 17:00 UTC30m
2026-07-16 DAL2802 BNA → ATL Jul 16, 12:49 UTCJul 16, 13:25 UTC35m
2026-07-15 DAL1490 ATL → BNA Jul 15, 23:32 UTCJul 16, 00:15 UTC43m
2026-07-15 DAL1490 ATL → BNA Jul 15, 23:35 UTCJul 16, 00:20 UTC45m
2026-07-15 DAL3014 SAV → ATL Jul 15, 21:15 UTCJul 15, 21:55 UTC40m
2026-07-15 DAL3014 SAV → ATL Jul 15, 21:15 UTCJul 15, 21:55 UTC40m
2026-07-15 DAL3014 ATL → SAV Jul 15, 19:10 UTCJul 15, 19:55 UTC45m
2026-07-15 DAL2681 MSN → ATL Jul 15, 16:10 UTCJul 15, 18:00 UTC1h 50m
2026-07-15 DAL2681 - Jul 15, 13:30 UTCJul 15, 15:05 UTC1h 35m
2026-07-15 DAL3181 - Jul 15, 10:40 UTCJul 15, 11:30 UTC50m
2026-07-15 DAL3181 GNV → ATL Jul 15, 10:35 UTCJul 15, 11:28 UTC53m
2026-07-15 DAL3079 - Jul 15, 01:25 UTCJul 15, 02:10 UTC45m
2026-07-14 DAL3143 - Jul 14, 22:25 UTCJul 14, 23:30 UTC1h 4m
2026-07-14 DAL3143 ATL → LEX Jul 14, 20:40 UTCJul 14, 21:25 UTC45m
2026-07-14 DAL2417 - Jul 14, 17:50 UTCJul 14, 19:15 UTC1h 25m
2026-07-14 DAL2417 ATL → MDW Jul 14, 15:10 UTCJul 14, 16:35 UTC1h 25m
2026-07-13 DAL2571 - Jul 13, 23:00 UTCJul 13, 23:40 UTC40m
2026-07-13 DAL2571 TYS → ATL Jul 13, 22:58 UTCJul 13, 23:33 UTC35m
2026-07-13 DAL2571 - Jul 13, 21:10 UTCJul 13, 21:40 UTC30m
2026-07-13 DAL2044 - Jul 13, 17:50 UTCJul 13, 19:40 UTC1h 50m
2026-07-13 DAL2044 ATL → HPN Jul 13, 13:55 UTCJul 13, 15:55 UTC2h 0m
2026-07-13 DAL2953 MLB → ATL Jul 13, 10:15 UTCJul 13, 11:20 UTC1h 5m
2026-07-13 DAL2953 MLB → ATL Jul 13, 10:12 UTCJul 13, 11:19 UTC1h 7m
2026-07-13 DAL2435 ATL → MLB Jul 13, 03:17 UTCJul 13, 04:20 UTC1h 3m
2026-07-13 DAL2435 ATL → MLB Jul 13, 03:20 UTCJul 13, 04:25 UTC1h 5m
2026-07-13 DAL3088 - Jul 13, 00:55 UTCJul 13, 02:05 UTC1h 10m
2026-07-13 DAL3088 DAY → ATL Jul 13, 00:53 UTCJul 13, 02:06 UTC1h 13m
2026-07-12 DAL3088 ATL → DAY Jul 12, 21:55 UTCJul 12, 23:15 UTC1h 20m
2026-07-12 DAL304 ABE → ATL Jul 12, 18:01 UTCJul 12, 20:20 UTC2h 20m
2026-07-12 DAL304 ATL → ABE Jul 12, 14:50 UTCJul 12, 16:25 UTC1h 35m
2026-07-12 DAL2379 - Jul 12, 10:45 UTCJul 12, 12:30 UTC1h 45m
2026-07-12 DAL1616 ATL → HPN Jul 12, 01:50 UTCJul 12, 03:40 UTC1h 50m

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 1h ago.
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, DAL3030, DAL2944, DAL3077, DAL3011.