Apparatus

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sensors Mode-S transponder

A3B7F4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N339HG · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A3B7F4
Octal
50733764
Decimal
10,729,460
Country
US
Tail
N339HG
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
730
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A3B7F4.

Country allocation

The ICAO 24-bit address A3B7F4 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
ENY3593 Envoy Air 11 2026-07-24
ENY3731 Envoy Air 10 2026-07-24
ENY4152 - 9 2026-06-23
ENY3448 Envoy Air 8 2026-07-22
ENY3478 - 7 2026-07-08
ENY3938 - 6 2026-07-07
ENY3875 - 6 2026-07-02
ENY3701 - 6 2026-07-17
ENY3504 Envoy Air 6 2026-06-01
ENY3389 Envoy Air 6 2026-06-19
ENY3351 - 6 2026-07-20
ENY4256 Envoy Air 5 2026-06-02
ENY4202 - 5 2026-06-28
ENY4144 Envoy Air 5 2026-04-19
ENY4142 Envoy Air 5 2026-07-19
ENY4126 Envoy Air 5 2026-06-09
ENY3849 Envoy Air 5 2026-07-26
ENY3825 - 5 2026-07-11
ENY3729 - 5 2026-07-02
ENY3697 Envoy Air 5 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3635 ORD → IND Jul 26, 22:30 UTCJul 26, 23:00 UTC30m
2026-07-26 ENY3849 AVP → ORD Jul 26, 16:30 UTCJul 26, 21:05 UTC4h 35m
2026-07-26 ENY3941 CVG → ORD Jul 26, 13:15 UTCJul 26, 14:20 UTC1h 5m
2026-07-26 ENY3903 ORD → MSN Jul 26, 02:20 UTCJul 26, 03:20 UTC1h 0m
2026-07-26 ENY3903 ORD → MSN Jul 26, 02:19 UTCJul 26, 03:16 UTC57m
2026-07-25 ENY4125 MIA → CVG Jul 25, 21:55 UTCJul 26, 01:05 UTC3h 10m
2026-07-25 ENY4125 MIA → CVG Jul 25, 17:50 UTCJul 25, 20:55 UTC3h 5m
2026-07-25 ENY3578 ORD → XNA Jul 25, 14:50 UTCJul 25, 16:30 UTC1h 40m
2026-07-25 ENY3578 ORD → XNA Jul 25, 12:20 UTCJul 25, 13:50 UTC1h 30m
2026-07-25 ENY3843 CVG → DFW Jul 25, 01:50 UTCJul 25, 02:40 UTC50m
2026-07-25 ENY3843 CVG → DFW Jul 25, 01:46 UTCJul 25, 02:34 UTC48m
2026-07-24 ENY3843 CVG → DFW Jul 24, 23:40 UTCJul 25, 00:30 UTC50m
2026-07-24 ENY3593 DCA → BOS Jul 24, 21:35 UTCJul 24, 22:30 UTC55m
2026-07-24 ENY3593 DCA → BOS Jul 24, 19:40 UTCJul 24, 20:40 UTC1h 0m
2026-07-24 ENY3731 ORD → CLE Jul 24, 17:40 UTCJul 24, 18:15 UTC35m
2026-07-24 ENY3731 ORD → CLE Jul 24, 16:00 UTCJul 24, 16:40 UTC40m
2026-07-24 ENY4290 MSY → MIA Jul 24, 12:45 UTCJul 24, 14:20 UTC1h 35m
2026-07-24 ENY4291 ORD → FCA Jul 24, 01:50 UTCJul 24, 03:20 UTC1h 30m
2026-07-23 ENY3653 LAN → ORD Jul 23, 23:50 UTCJul 24, 00:45 UTC55m
2026-07-23 ENY3653 LAN → ORD Jul 23, 23:46 UTCJul 24, 00:39 UTC53m
2026-07-23 ENY3653 LAN → ORD Jul 23, 22:05 UTCJul 23, 22:55 UTC50m
2026-07-23 ENY3547 MSY → MIA Jul 23, 20:20 UTCJul 23, 20:55 UTC35m
2026-07-23 ENY3547 MSY → MIA Jul 23, 20:14 UTCJul 23, 20:49 UTC35m
2026-07-23 ENY3547 MSY → MIA Jul 23, 18:50 UTCJul 23, 19:15 UTC25m
2026-07-23 ENY3591 ORD → RDU Jul 23, 16:20 UTCJul 23, 17:35 UTC1h 15m
2026-07-23 ENY3591 ORD → RDU Jul 23, 14:10 UTCJul 23, 15:20 UTC1h 10m
2026-07-22 ENY3936 CMH → ORD Jul 22, 22:50 UTCJul 23, 01:00 UTC2h 10m
2026-07-22 ENY3936 CMH → ORD Jul 22, 22:49 UTCJul 23, 00:55 UTC2h 6m
2026-07-22 ENY3936 CMH → ORD Jul 22, 19:55 UTCJul 22, 22:05 UTC2h 10m
2026-07-22 ENY3539 - Jul 22, 16:40 UTCJul 22, 17:45 UTC1h 5m
2026-07-22 ENY3539 - Jul 22, 14:25 UTCJul 22, 15:35 UTC1h 10m
2026-07-22 ENY3448 BTV → DCA Jul 22, 11:35 UTCJul 22, 13:00 UTC1h 25m
2026-07-22 ENY3659 MIA → STL Jul 22, 00:10 UTCJul 22, 01:30 UTC1h 20m
2026-07-22 ENY3659 MIA → STL Jul 22, 00:05 UTCJul 22, 01:25 UTC1h 20m
2026-07-21 ENY3593 DCA → BOS Jul 21, 22:10 UTCJul 21, 23:05 UTC55m
2026-07-21 ENY3593 DCA → BOS Jul 21, 19:40 UTCJul 21, 20:35 UTC55m
2026-07-21 ENY3768 MIA → PNS Jul 21, 13:55 UTCJul 21, 18:30 UTC4h 35m
2026-07-21 ENY3664 CMH → ORD Jul 21, 10:20 UTCJul 21, 12:30 UTC2h 10m
2026-07-21 ENY3658 - Jul 21, 01:25 UTCJul 21, 03:15 UTC1h 50m
2026-07-20 ENY3621 LEX → DFW Jul 20, 22:00 UTCJul 20, 23:50 UTC1h 50m
2026-07-20 ENY3621 - Jul 20, 19:10 UTCJul 20, 21:00 UTC1h 50m
2026-07-20 ENY3340 DFW → SDF Jul 20, 16:10 UTCJul 20, 17:30 UTC1h 20m
2026-07-20 ENY3340 DFW → SDF Jul 20, 16:08 UTCJul 20, 17:30 UTC1h 22m
2026-07-20 ENY3703 ORD → BOS Jul 20, 14:00 UTCJul 20, 15:15 UTC1h 15m
2026-07-20 ENY3372 ORD → COU Jul 20, 11:05 UTCJul 20, 12:10 UTC1h 5m
2026-07-20 ENY3589 - Jul 20, 04:25 UTCJul 20, 05:20 UTC55m
2026-07-20 ENY3589 DFW → LRD Jul 20, 04:20 UTCJul 20, 05:18 UTC58m
2026-07-20 ENY3351 - Jul 20, 01:55 UTCJul 20, 02:40 UTC45m
2026-07-20 ENY3351 - Jul 20, 00:05 UTCJul 20, 00:45 UTC40m
2026-07-19 ENY3580 MSY → DCA Jul 19, 21:05 UTCJul 19, 22:45 UTC1h 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 N339HG page for operator, model, and routing details .

Mode-S A3B7F4 frequently asked

What is Mode-S code A3B7F4?
A3B7F4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N339HG.
Where is Mode-S A3B7F4 registered?
Mode-S code A3B7F4 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 A3B7F4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3B7F4, octal 50733764, decimal 10,729,460.
What flights does A3B7F4 operate?
Mode-S A3B7F4 has broadcast 20 distinct callsigns, including ENY3593, ENY3731, ENY4152, ENY3448, ENY3478.