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sensors Mode-S transponder

A9FEC4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N743MB · operated by WILMINGTON TRUST CO

Hex
A9FEC4
Octal
52377304
Decimal
11,140,804
Country
US
Tail
N743MB
Type
E170
No current signal · last broadcast 3h ago
Flights observed
705
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A9FEC4.

Country allocation

The ICAO 24-bit address A9FEC4 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
ENY3600 - 20 2026-07-11
ENY3625 - 13 2026-07-04
ENY3769 - 12 2026-07-07
ENY4174 - 10 2026-06-25
ENY3407 - 10 2026-07-08
ENY3391 - 10 2026-07-05
ENY3972 Envoy Air 9 2026-06-27
ENY3626 - 9 2026-07-02
ENY3649 - 8 2026-06-21
ENY3554 Envoy Air 8 2026-05-13
ENY4211 Envoy Air 7 2026-05-19
ENY4102 - 7 2026-06-27
ENY3846 - 7 2026-07-13
ENY3827 - 7 2026-07-06
ENY3612 - 7 2026-07-10
ENY3482 Envoy Air 7 2026-05-05
ENY3446 - 7 2026-07-13
ENY4247 - 6 2026-07-12
ENY4077 Envoy Air 6 2026-05-31
ENY4036 Envoy Air 6 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ENY3846 - Jul 13, 22:20 UTCJul 13, 23:35 UTC1h 15m
2026-07-13 ENY3815 STL → ORD Jul 13, 19:45 UTCJul 13, 20:45 UTC1h 0m
2026-07-13 ENY3815 STL → ORD Jul 13, 19:42 UTCJul 13, 20:36 UTC54m
2026-07-13 ENY3815 - Jul 13, 17:50 UTCJul 13, 18:35 UTC45m
2026-07-13 ENY3446 - Jul 13, 14:40 UTCJul 13, 16:05 UTC1h 25m
2026-07-13 ENY3446 BWI → ORD Jul 13, 14:37 UTCJul 13, 16:05 UTC1h 28m
2026-07-13 ENY3446 - Jul 13, 12:05 UTCJul 13, 13:30 UTC1h 25m
2026-07-13 ENY3763 - Jul 13, 10:10 UTCJul 13, 10:45 UTC35m
2026-07-13 ENY3790 ORD → ATW Jul 13, 04:30 UTCJul 13, 05:10 UTC40m
2026-07-13 ENY3783 - Jul 13, 01:45 UTCJul 13, 03:01 UTC1h 15m
2026-07-12 ENY3783 - Jul 12, 21:00 UTCJul 12, 22:05 UTC1h 5m
2026-07-12 ENY3437 - Jul 12, 18:15 UTCJul 12, 18:55 UTC40m
2026-07-12 ENY3437 - Jul 12, 16:35 UTCJul 12, 17:01 UTC25m
2026-07-12 ENY4018 - Jul 12, 14:25 UTCJul 12, 15:05 UTC40m
2026-07-12 ENY4018 - Jul 12, 11:55 UTCJul 12, 12:20 UTC25m
2026-07-12 ENY4247 ROC → ORD Jul 12, 09:15 UTCJul 12, 10:40 UTC1h 25m
2026-07-12 ENY4247 ROC → ORD Jul 12, 09:12 UTCJul 12, 10:40 UTC1h 28m
2026-07-12 ENY4219 ORD → ROC Jul 12, 02:15 UTCJul 12, 03:30 UTC1h 15m
2026-07-11 ENY3783 - Jul 11, 22:50 UTCJul 12, 00:10 UTC1h 20m
2026-07-11 ENY3783 - Jul 11, 20:10 UTCJul 11, 21:15 UTC1h 5m
2026-07-11 ENY3600 - Jul 11, 16:35 UTCJul 11, 18:30 UTC1h 55m
2026-07-11 ENY3600 - Jul 11, 13:50 UTCJul 11, 15:00 UTC1h 10m
2026-07-11 ENY3600 ORD → YUL Jul 11, 13:50 UTCJul 11, 15:24 UTC1h 34m
2026-07-11 ENY4293 - Jul 11, 10:15 UTCJul 11, 12:05 UTC1h 50m
2026-07-11 ENY4275 - Jul 11, 02:00 UTCJul 11, 03:35 UTC1h 35m
2026-07-10 ENY3490 CWA → ORD Jul 10, 23:50 UTCJul 11, 00:45 UTC55m
2026-07-10 ENY3490 CWA → ORD Jul 10, 23:50 UTCJul 11, 00:40 UTC50m
2026-07-10 ENY3490 - Jul 10, 22:15 UTCJul 10, 22:55 UTC40m
2026-07-10 ENY3612 - Jul 10, 20:10 UTCJul 10, 20:55 UTC45m
2026-07-10 ENY3612 LAN → ORD Jul 10, 20:03 UTCJul 10, 20:48 UTC45m
2026-07-10 ENY3612 - Jul 10, 18:35 UTCJul 10, 19:00 UTC25m
2026-07-10 ENY3476 - Jul 10, 16:40 UTCJul 10, 17:10 UTC30m
2026-07-10 ENY3476 - Jul 10, 15:25 UTCJul 10, 15:55 UTC30m
2026-07-10 ENY4129 - Jul 10, 12:55 UTCJul 10, 14:15 UTC1h 20m
2026-07-10 ENY4129 SGF → ORD Jul 10, 12:53 UTCJul 10, 14:15 UTC1h 22m
2026-07-10 ENY3963 - Jul 10, 02:15 UTCJul 10, 03:20 UTC1h 5m
2026-07-10 ENY3963 ORD → SGF Jul 10, 02:15 UTCJul 10, 03:18 UTC1h 3m
2026-07-09 ENY3477 CMI → ORD Jul 9, 23:35 UTCJul 10, 00:15 UTC40m
2026-07-09 ENY3477 - Jul 9, 22:15 UTCJul 9, 22:45 UTC30m
2026-07-09 ENY3848 - Jul 9, 19:30 UTCJul 9, 20:50 UTC1h 20m
2026-07-09 ENY3848 - Jul 9, 16:55 UTCJul 9, 18:15 UTC1h 20m
2026-07-09 ENY4103 - Jul 9, 14:35 UTCJul 9, 15:25 UTC50m
2026-07-09 ENY4103 ORD → DTW Jul 9, 12:45 UTCJul 9, 13:30 UTC45m
2026-07-09 ENY4247 ROC → ORD Jul 9, 09:00 UTCJul 9, 10:30 UTC1h 30m
2026-07-09 ENY4247 ROC → ORD Jul 9, 09:00 UTCJul 9, 10:28 UTC1h 28m
2026-07-09 ENY4219 ORD → ROC Jul 9, 02:40 UTCJul 9, 03:50 UTC1h 10m
2026-07-08 ENY3407 - Jul 8, 22:50 UTCJul 9, 00:45 UTC1h 55m
2026-07-08 ENY3407 AVP → ORD Jul 8, 22:45 UTCJul 9, 00:21 UTC1h 36m
2026-07-08 ENY3407 - Jul 8, 20:30 UTCJul 8, 21:45 UTC1h 15m
2026-07-08 ENY3600 YUL → ORD Jul 8, 16:40 UTCJul 8, 18:25 UTC1h 45m

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 N743MB page for operator, model, and routing details .

Mode-S A9FEC4 frequently asked

What is Mode-S code A9FEC4?
A9FEC4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N743MB.
Where is Mode-S A9FEC4 registered?
Mode-S code A9FEC4 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 A9FEC4 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9FEC4, octal 52377304, decimal 11,140,804.
What flights does A9FEC4 operate?
Mode-S A9FEC4 has broadcast 20 distinct callsigns, including ENY3600, ENY3625, ENY3769, ENY4174, ENY3407.