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sensors Mode-S transponder

AA55BD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N765ST · operated by AMERICAN AIRLINES INC

Hex
AA55BD
Octal
52452675
Decimal
11,163,069
Country
US
Tail
N765ST
Type
E170
No current signal · last broadcast Jul 26, 20:20 UTC
Flights observed
833
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:20 UTC

Last known position

Most recent position reported by Mode-S AA55BD.

Country allocation

The ICAO 24-bit address AA55BD 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
ENY3391 - 12 2026-07-07
ENY4151 - 11 2026-07-14
ENY3973 Envoy Air 11 2026-06-12
ENY3839 - 11 2026-07-09
ENY4330 - 10 2026-06-21
ENY3595 Envoy Air 10 2026-05-13
ENY3494 Envoy Air 10 2026-05-13
ENY3972 Envoy Air 9 2026-06-08
ENY3750 Envoy Air 9 2026-05-27
ENY3741 - 9 2026-07-10
ENY3600 - 9 2026-07-18
ENY3490 Envoy Air 9 2026-07-23
ENY3827 Envoy Air 8 2026-07-21
ENY3681 - 8 2026-07-17
ENY3553 - 8 2026-07-16
ENY3491 - 8 2026-07-16
ENY3457 Envoy Air 8 2026-05-06
ENY3365 Envoy Air 8 2026-07-24
ENY4190 - 7 2026-07-23
ENY4103 - 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY4040 ORD → PIT Jul 26, 19:55 UTCJul 26, 20:20 UTC25m
2026-07-26 ENY4040 ORD → PIT Jul 26, 18:15 UTCJul 26, 18:35 UTC20m
2026-07-26 ENY3644 DFW → MLI Jul 26, 15:40 UTCJul 26, 16:50 UTC1h 10m
2026-07-26 ENY3644 DFW → MLI Jul 26, 13:45 UTCJul 26, 14:40 UTC55m
2026-07-26 ENY3709 STS → PHX Jul 26, 11:20 UTCJul 26, 11:50 UTC30m
2026-07-26 ENY3714 FAT → PHX Jul 26, 04:10 UTCJul 26, 04:35 UTC25m
2026-07-26 ENY3402 ORD → SYR Jul 26, 01:05 UTCJul 26, 01:50 UTC45m
2026-07-25 ENY3402 ORD → SYR Jul 25, 22:50 UTCJul 25, 23:25 UTC35m
2026-07-25 ENY4185 LEX → ORD Jul 25, 16:10 UTCJul 25, 20:55 UTC4h 45m
2026-07-25 ENY3736 LSE → ORD Jul 25, 02:00 UTCJul 25, 14:20 UTC12h 20m
2026-07-24 ENY3365 CID → ORD Jul 24, 23:20 UTCJul 25, 00:00 UTC40m
2026-07-24 ENY3365 CID → ORD Jul 24, 21:50 UTCJul 24, 22:10 UTC20m
2026-07-24 ENY3592 CMH → DFW Jul 24, 19:35 UTCJul 24, 20:30 UTC55m
2026-07-24 ENY3592 CMH → DFW Jul 24, 19:30 UTCJul 24, 20:22 UTC52m
2026-07-24 ENY3592 CMH → DFW Jul 24, 17:40 UTCJul 24, 18:45 UTC1h 5m
2026-07-24 ENY3425 DFW → HOU Jul 24, 14:45 UTCJul 24, 16:15 UTC1h 30m
2026-07-24 ENY3425 DFW → HOU Jul 24, 12:35 UTCJul 24, 14:00 UTC1h 25m
2026-07-24 ENY3544 ORD → CMI Jul 24, 01:00 UTCJul 24, 02:45 UTC1h 45m
2026-07-23 ENY183H CAE → ORD Jul 23, 21:45 UTCJul 23, 23:25 UTC1h 40m
2026-07-23 ENY4183 PNS → MIA Jul 23, 18:45 UTCJul 23, 20:10 UTC1h 25m
2026-07-23 ENY4190 - Jul 23, 16:45 UTCJul 23, 17:25 UTC40m
2026-07-23 ENY4190 - Jul 23, 15:05 UTCJul 23, 15:40 UTC35m
2026-07-23 ENY4181 DFW → GRR Jul 23, 11:45 UTCJul 23, 13:20 UTC1h 35m
2026-07-23 ENY3757 CMI → ORD Jul 23, 02:40 UTCJul 23, 03:55 UTC1h 15m
2026-07-23 ENY3490 AVL → DFW Jul 23, 00:05 UTCJul 23, 01:10 UTC1h 5m
2026-07-22 ENY3490 AVL → DFW Jul 22, 23:59 UTCJul 23, 00:49 UTC50m
2026-07-22 ENY3490 AVL → DFW Jul 22, 22:20 UTCJul 22, 22:55 UTC35m
2026-07-22 ENY3848 LEX → ORD Jul 22, 19:15 UTCJul 22, 20:30 UTC1h 15m
2026-07-22 ENY3848 LEX → ORD Jul 22, 17:05 UTCJul 22, 18:15 UTC1h 10m
2026-07-22 ENY4103 - Jul 22, 14:40 UTCJul 22, 15:30 UTC50m
2026-07-22 ENY4103 DTW → ORD Jul 22, 14:35 UTCJul 22, 15:24 UTC49m
2026-07-22 ENY4103 ORD → DTW Jul 22, 12:40 UTCJul 22, 13:35 UTC55m
2026-07-22 ENY3790 BDL → ORD Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 ENY4000 ORD → ILM Jul 22, 01:20 UTCJul 22, 02:25 UTC1h 5m
2026-07-22 ENY4000 ORD → ILM Jul 22, 01:17 UTCJul 22, 02:10 UTC53m
2026-07-21 ENY4000 ORD → ILM Jul 21, 23:25 UTCJul 22, 00:25 UTC1h 0m
2026-07-21 ENY3744 COU → ORD Jul 21, 19:20 UTCJul 21, 21:40 UTC2h 20m
2026-07-21 ENY3744 COU → ORD Jul 21, 19:13 UTCJul 21, 21:49 UTC2h 36m
2026-07-21 ENY3744 COU → ORD Jul 21, 16:10 UTCJul 21, 17:25 UTC1h 15m
2026-07-21 ENY4036 - Jul 21, 14:00 UTCJul 21, 14:50 UTC50m
2026-07-21 ENY4036 MQT → ORD Jul 21, 13:52 UTCJul 21, 14:59 UTC1h 7m
2026-07-21 ENY9869 - Jul 21, 12:05 UTCJul 21, 12:50 UTC45m
2026-07-21 ENY3702 MSN → ORD Jul 21, 10:05 UTCJul 21, 10:36 UTC31m
2026-07-21 ENY3728 AGU → DFW Jul 21, 04:15 UTCJul 21, 04:45 UTC30m
2026-07-21 ENY3827 BOS → ORD Jul 21, 00:55 UTCJul 21, 03:00 UTC2h 5m
2026-07-20 ENY3827 BOS → ORD Jul 20, 22:20 UTCJul 20, 23:40 UTC1h 20m
2026-07-20 ENY3596 CLE → ORD Jul 20, 19:55 UTCJul 20, 20:40 UTC45m
2026-07-20 ENY3596 CLE → ORD Jul 20, 18:30 UTCJul 20, 19:05 UTC35m
2026-07-20 ENY3800 SGF → ORD Jul 20, 15:40 UTCJul 20, 16:55 UTC1h 15m
2026-07-20 ENY3800 SGF → ORD Jul 20, 15:40 UTCJul 20, 16:51 UTC1h 11m

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 N765ST page for operator, model, and routing details .

Mode-S AA55BD frequently asked

What is Mode-S code AA55BD?
AA55BD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N765ST.
Where is Mode-S AA55BD registered?
Mode-S code AA55BD 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 AA55BD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA55BD, octal 52452675, decimal 11,163,069.
What flights does AA55BD operate?
Mode-S AA55BD has broadcast 20 distinct callsigns, including ENY3391, ENY4151, ENY3973, ENY3839, ENY4330.