Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A9DDB0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N735AT · BOEING 777-300ER · operated by AMERICAN AIRLINES INC

Hex
A9DDB0
Octal
52356660
Decimal
11,132,336
Country
US
Tail
N735AT
Type
B77W
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
252
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A9DDB0.

Country allocation

The ICAO 24-bit address A9DDB0 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
AAL176 American Airlines 17 2026-07-25
AAL79 American Airlines 16 2026-07-02
AAL735 American Airlines 16 2026-07-01
AAL38 American Airlines 15 2026-06-04
AAL80 American Airlines 14 2026-07-26
AAL734 - 14 2026-07-02
AAL175 American Airlines 14 2026-07-24
AAL39 American Airlines 13 2026-06-02
AAL81 American Airlines 11 2026-07-26
AAL72 American Airlines 10 2026-06-20
AAL20 - 10 2026-07-18
AAL929 American Airlines 9 2026-06-03
AAL78 - 9 2026-07-04
AAL51 American Airlines 9 2026-07-22
AAL73 - 8 2026-06-19
AAL137 - 8 2026-07-04
AAL142 - 7 2026-07-20
AAL101 American Airlines 6 2026-05-01
AAL953 - 5 2026-07-10
AAL930 American Airlines 5 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL81 LHR → DFW Jul 26, 16:00 UTCJul 26, 22:00 UTC6h 0m
2026-07-26 AAL80 DFW → LHR Jul 26, 02:45 UTCJul 26, 06:40 UTC3h 56m
2026-07-26 AAL80 DFW → LHR Jul 26, 02:43 UTCJul 26, 11:19 UTC8h 36m
2026-07-25 AAL176 NRT → DFW Jul 25, 10:00 UTCJul 25, 21:20 UTC11h 20m
2026-07-24 AAL175 DFW → HND Jul 24, 16:30 UTCJul 25, 04:55 UTC12h 25m
2026-07-23 AAL217 CLT → AUS Jul 23, 11:25 UTCJul 23, 23:45 UTC12h 20m
2026-07-22 AAL216 SFO → DFW Jul 22, 21:27 UTCJul 23, 08:28 UTC11h 1m
2026-07-22 AAL216 SFO → DFW Jul 22, 21:30 UTCJul 23, 08:30 UTC11h 0m
2026-07-22 AAL51 LHR → DFW Jul 22, 09:04 UTCJul 22, 18:11 UTC9h 7m
2026-07-21 AAL730 CLT → LHR Jul 21, 23:00 UTCJul 22, 05:25 UTC6h 25m
2026-07-21 AAL731 - Jul 21, 08:40 UTCJul 21, 16:30 UTC7h 50m
2026-07-20 AAL142 - Jul 20, 19:50 UTCJul 20, 20:15 UTC25m
2026-07-20 AAL142 - Jul 20, 13:55 UTCJul 20, 19:45 UTC5h 50m
2026-07-19 AAL141 LHR → JFK Jul 19, 17:45 UTCJul 20, 00:50 UTC7h 5m
2026-07-18 AAL20 - Jul 18, 23:05 UTCJul 19, 07:50 UTC8h 45m
2026-07-18 AAL176 HND → DFW Jul 18, 08:10 UTCJul 18, 19:55 UTC11h 45m
2026-07-17 AAL175 DFW → HND Jul 17, 16:44 UTCJul 18, 04:55 UTC12h 11m
2026-07-17 AAL217 JFK → DFW Jul 17, 07:14 UTCJul 17, 10:00 UTC2h 45m
2026-07-16 AAL217 ATH → JFK Jul 16, 17:56 UTCJul 17, 03:30 UTC9h 34m
2026-07-16 AAL217 - Jul 16, 18:00 UTCJul 16, 20:00 UTC2h 0m
2026-07-16 AAL216 - Jul 16, 03:05 UTCJul 16, 14:15 UTC11h 10m
2026-07-15 AAL217 ATH → DFW Jul 15, 11:45 UTCJul 15, 23:50 UTC12h 5m
2026-07-14 AAL216P DFW → ATH Jul 14, 21:49 UTCJul 15, 09:30 UTC11h 41m
2026-07-14 AAL216P DFW → ATH Jul 14, 21:50 UTCJul 15, 09:30 UTC11h 39m
2026-07-14 AAL51 - Jul 14, 08:20 UTCJul 14, 17:15 UTC8h 55m
2026-07-13 AAL142 JFK → LHR Jul 13, 13:45 UTCJul 13, 20:10 UTC6h 25m
2026-07-11 AAL954 - Jul 11, 00:20 UTCJul 11, 10:20 UTC10h 0m
2026-07-10 AAL953 JFK → EZE Jul 10, 04:50 UTCJul 10, 14:35 UTC9h 45m
2026-07-09 AAL9601 LHR → JFK Jul 9, 10:45 UTCJul 9, 17:40 UTC6h 55m
2026-07-08 AAL20 - Jul 8, 23:25 UTCJul 9, 08:00 UTC8h 35m
2026-07-08 AAL20 DFW → LHR Jul 8, 23:22 UTCJul 9, 08:12 UTC8h 50m
2026-07-08 AAL176 NRT → DFW Jul 8, 07:56 UTCJul 8, 18:55 UTC10h 59m
2026-07-08 AAL176 NRT → DFW Jul 8, 08:00 UTCJul 8, 18:50 UTC10h 50m
2026-07-07 AAL175 DFW → HND Jul 7, 16:25 UTCJul 8, 05:10 UTC12h 45m
2026-07-07 AAL175 DFW → HND Jul 7, 16:24 UTCJul 8, 05:03 UTC12h 39m
2026-07-06 AAL81 - Jul 6, 15:55 UTCJul 7, 01:00 UTC9h 5m
2026-07-06 AAL136 - Jul 6, 01:25 UTCJul 6, 11:40 UTC10h 15m
2026-07-04 AAL137 - Jul 4, 16:30 UTCJul 5, 02:55 UTC10h 25m
2026-07-04 AAL137 LHR → LAX Jul 4, 16:27 UTCJul 5, 02:53 UTC10h 26m
2026-07-04 AAL78 - Jul 4, 04:40 UTCJul 4, 12:55 UTC8h 15m
2026-07-03 AAL81 - Jul 3, 15:45 UTCJul 4, 01:10 UTC9h 25m
2026-07-03 AAL80 - Jul 3, 03:05 UTCJul 3, 11:30 UTC8h 25m
2026-07-03 AAL80 DFW → LHR Jul 3, 03:01 UTCJul 3, 11:25 UTC8h 24m
2026-07-02 AAL79 LHR → DFW Jul 2, 14:45 UTCJul 3, 00:25 UTC9h 40m
2026-07-02 AAL734 - Jul 2, 05:15 UTCJul 2, 07:40 UTC2h 25m
2026-07-02 AAL734 CLT → LHR Jul 2, 05:11 UTCJul 2, 12:16 UTC7h 5m
2026-07-01 AAL735 AUA → LGA Jul 1, 17:05 UTCJul 2, 01:05 UTC8h 0m
2026-07-01 AAL78 DFW → LHR Jul 1, 06:30 UTCJul 1, 14:55 UTC8h 25m
2026-07-01 AAL78 DFW → LHR Jul 1, 06:28 UTCJul 1, 14:51 UTC8h 23m
2026-06-29 AAL79 LHR → DFW Jun 29, 19:35 UTCJun 29, 23:14 UTC3h 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 N735AT page for operator, model, and routing details .

Mode-S A9DDB0 frequently asked

What is Mode-S code A9DDB0?
A9DDB0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N735AT.
Where is Mode-S A9DDB0 registered?
Mode-S code A9DDB0 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 A9DDB0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9DDB0, octal 52356660, decimal 11,132,336.
What flights does A9DDB0 operate?
Mode-S A9DDB0 has broadcast 20 distinct callsigns, including AAL176, AAL79, AAL735, AAL38, AAL80.