Apparatus

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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
Broadcasting now · callsign ENY3740 · 1,950 ft
Flights observed
804
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Current position

A9FEC4 is currently broadcasting. Map zoomed to live position.

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 Envoy Air 22 2026-07-22
ENY3769 - 14 2026-07-17
ENY3625 - 13 2026-07-04
ENY3407 Envoy Air 13 2026-07-22
ENY4174 - 12 2026-07-15
ENY3391 - 10 2026-07-05
ENY3972 Envoy Air 9 2026-06-27
ENY3827 Envoy Air 9 2026-07-26
ENY3626 - 9 2026-07-02
ENY4151 Envoy Air 8 2026-07-23
ENY3846 - 8 2026-07-14
ENY3649 - 8 2026-06-21
ENY3645 Envoy Air 8 2026-07-21
ENY3554 Envoy Air 8 2026-05-13
ENY3491 Envoy Air 8 2026-07-25
ENY4330 Envoy Air 7 2026-07-25
ENY4211 Envoy Air 7 2026-05-19
ENY4102 - 7 2026-06-27
ENY3785 - 7 2026-07-14
ENY3744 Envoy Air 7 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3471 BOS → ORD Jul 26, 20:40 UTCJul 26, 22:00 UTC1h 20m
2026-07-26 ENY3698 PHX → SJC Jul 26, 17:00 UTCJul 26, 17:35 UTC35m
2026-07-26 ENY3698 PHX → SJC Jul 26, 15:25 UTCJul 26, 15:40 UTC15m
2026-07-26 ENY3707 STL → BOS Jul 26, 12:10 UTCJul 26, 13:05 UTC55m
2026-07-26 ENY3706 AUS → JAX Jul 26, 04:10 UTCJul 26, 04:50 UTC40m
2026-07-26 ENY3706 AUS → JAX Jul 26, 04:09 UTCJul 26, 04:54 UTC45m
2026-07-26 ENY3827 BOS → ORD Jul 26, 00:30 UTCJul 26, 02:00 UTC1h 30m
2026-07-25 ENY3827 BOS → ORD Jul 25, 22:15 UTCJul 25, 23:35 UTC1h 20m
2026-07-25 ENY4330 ORD → FWA Jul 25, 19:50 UTCJul 25, 20:30 UTC40m
2026-07-25 ENY4330 ORD → FWA Jul 25, 19:45 UTCJul 25, 20:31 UTC46m
2026-07-25 ENY4330 ORD → FWA Jul 25, 18:20 UTCJul 25, 18:45 UTC25m
2026-07-25 ENY3491 CLT → MSN Jul 25, 15:15 UTCJul 25, 16:00 UTC45m
2026-07-25 ENY3491 CLT → MSN Jul 25, 13:25 UTCJul 25, 14:05 UTC40m
2026-07-25 ENY3490 AVL → DFW Jul 25, 00:00 UTCJul 25, 00:50 UTC50m
2026-07-24 ENY3490 AVL → DFW Jul 24, 22:05 UTCJul 24, 22:45 UTC40m
2026-07-24 ENY3596 CLE → ORD Jul 24, 19:45 UTCJul 24, 20:20 UTC35m
2026-07-24 ENY3596 CLE → ORD Jul 24, 18:05 UTCJul 24, 18:35 UTC30m
2026-07-24 ENY3480 MSY → AUS Jul 24, 15:45 UTCJul 24, 16:40 UTC55m
2026-07-24 ENY3480 MSY → AUS Jul 24, 13:55 UTCJul 24, 14:40 UTC45m
2026-07-24 ENY4272 ORD → AUS Jul 24, 10:10 UTCJul 24, 11:50 UTC1h 40m
2026-07-24 ENY4271 EYW → DCA Jul 24, 01:15 UTCJul 24, 02:35 UTC1h 20m
2026-07-24 ENY4271 EYW → DCA Jul 24, 01:10 UTCJul 24, 02:32 UTC1h 22m
2026-07-23 ENY4151 AVL → DFW Jul 23, 22:05 UTCJul 23, 23:35 UTC1h 30m
2026-07-23 ENY4151 AVL → DFW Jul 23, 19:55 UTCJul 23, 21:00 UTC1h 5m
2026-07-23 ENY3747 CVG → ORD Jul 23, 16:10 UTCJul 23, 18:10 UTC2h 0m
2026-07-23 ENY3747 CVG → ORD Jul 23, 13:15 UTCJul 23, 15:00 UTC1h 45m
2026-07-22 ENY3407 ABI → DFW Jul 22, 22:50 UTCJul 23, 00:45 UTC1h 55m
2026-07-22 ENY3407 ABI → DFW Jul 22, 22:46 UTCJul 23, 00:39 UTC1h 53m
2026-07-22 ENY3407 ABI → DFW Jul 22, 20:20 UTCJul 22, 21:35 UTC1h 15m
2026-07-22 ENY3600 CMH → CLT Jul 22, 16:45 UTCJul 22, 18:40 UTC1h 55m
2026-07-22 ENY3600 CMH → CLT Jul 22, 13:35 UTCJul 22, 15:10 UTC1h 35m
2026-07-22 ENY4293 SGF → ORD Jul 22, 11:10 UTCJul 22, 12:10 UTC1h 0m
2026-07-22 ENY4293 SGF → ORD Jul 22, 10:18 UTCJul 22, 12:04 UTC1h 46m
2026-07-22 ENY4275 CLT → PNS Jul 22, 02:00 UTCJul 22, 03:20 UTC1h 20m
2026-07-22 ENY4275 CLT → PNS Jul 22, 01:56 UTCJul 22, 03:21 UTC1h 25m
2026-07-21 ENY3645 ORD → IND Jul 21, 23:05 UTCJul 21, 23:45 UTC40m
2026-07-21 ENY3645 ORD → IND Jul 21, 22:59 UTCJul 21, 23:38 UTC39m
2026-07-21 ENY3645 ORD → IND Jul 21, 21:40 UTCJul 21, 22:20 UTC40m
2026-07-21 ENY3719 MSP → ORD Jul 21, 19:08 UTCJul 21, 20:00 UTC52m
2026-07-21 ENY3375 - Jul 21, 17:10 UTCJul 21, 18:15 UTC1h 5m
2026-07-21 ENY3375 ORD → MSP Jul 21, 17:09 UTCJul 21, 18:10 UTC1h 1m
2026-07-21 ENY3973 BNA → ORD Jul 21, 14:20 UTCJul 21, 15:45 UTC1h 25m
2026-07-21 ENY3973 - Jul 21, 11:55 UTCJul 21, 12:50 UTC55m
2026-07-20 ENY3645 ORD → IND Jul 20, 23:05 UTCJul 20, 23:55 UTC49m
2026-07-20 ENY3645 ORD → IND Jul 20, 22:59 UTCJul 20, 23:53 UTC54m
2026-07-20 ENY3645 ORD → IND Jul 20, 21:25 UTCJul 20, 22:10 UTC45m
2026-07-20 ENY3744 COU → ORD Jul 20, 18:15 UTCJul 20, 19:50 UTC1h 35m
2026-07-20 ENY3744 COU → ORD Jul 20, 15:45 UTCJul 20, 17:00 UTC1h 15m
2026-07-20 ENY3564 SGF → DFW Jul 20, 12:25 UTCJul 20, 14:00 UTC1h 35m
2026-07-20 ENY3607 ORD → GRR Jul 20, 02:10 UTCJul 20, 03:20 UTC1h 10m

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?
Yes. Mode-S A9FEC4 is currently airborne.
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, ENY3769, ENY3625, ENY3407, ENY4174.