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sensors Mode-S transponder

A1D4BC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N217NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A1D4BC
Octal
50352274
Decimal
10,605,756
Country
US
Tail
N217NN
Type
E75L
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
795
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S A1D4BC.

Country allocation

The ICAO 24-bit address A1D4BC 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
ENY3374 Envoy Air 10 2026-07-26
ENY3733 - 8 2026-06-29
ENY3618 - 8 2026-07-20
ENY3605 Envoy Air 8 2026-06-03
ENY3394 - 8 2026-07-16
ENY4096 Envoy Air 7 2026-05-15
ENY4040 Envoy Air 7 2026-05-17
ENY3843 Envoy Air 7 2026-07-21
ENY3795 - 7 2026-07-13
ENY3721 Envoy Air 7 2026-07-25
ENY3502 - 7 2026-06-25
ENY4263 Envoy Air 6 2026-07-22
ENY4152 - 6 2026-07-13
ENY3825 - 6 2026-07-15
ENY3823 - 6 2026-07-15
ENY3797 Envoy Air 6 2026-07-06
ENY3450 - 6 2026-07-17
ENY3412 - 6 2026-07-21
ENY3397 Envoy Air 6 2026-06-07
ENY3387 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3374 PHX → STS Jul 26, 19:25 UTCJul 26, 20:50 UTC1h 25m
2026-07-26 ENY3374 PHX → STS Jul 26, 17:10 UTCJul 26, 18:30 UTC1h 20m
2026-07-26 ENY4120 ORD → IND Jul 26, 13:30 UTCJul 26, 14:25 UTC55m
2026-07-26 ENY3686 MSP → ORD Jul 26, 11:40 UTCJul 26, 12:25 UTC45m
2026-07-26 ENY3686 MSP → ORD Jul 26, 11:40 UTCJul 26, 12:28 UTC48m
2026-07-26 ENY3579 DOM → MIA Jul 26, 00:45 UTCJul 26, 02:05 UTC1h 20m
2026-07-25 ENY3579 DOM → MIA Jul 25, 22:25 UTCJul 25, 23:50 UTC1h 25m
2026-07-25 ENY3721 MQT → ORD Jul 25, 19:50 UTCJul 25, 21:05 UTC1h 15m
2026-07-25 ENY3721 MQT → ORD Jul 25, 19:50 UTCJul 25, 21:00 UTC1h 10m
2026-07-25 ENY3721 MQT → ORD Jul 25, 17:55 UTCJul 25, 19:05 UTC1h 10m
2026-07-25 ENY4120 ORD → IND Jul 25, 11:45 UTCJul 25, 12:35 UTC50m
2026-07-25 ENY3686 MSP → ORD Jul 25, 04:15 UTCJul 25, 04:55 UTC40m
2026-07-25 ENY3883 DFW → VPS Jul 25, 00:45 UTCJul 25, 02:10 UTC1h 25m
2026-07-24 ENY3883 DFW → VPS Jul 24, 22:30 UTCJul 24, 23:40 UTC1h 10m
2026-07-24 ENY3441 GSP → MIA Jul 24, 20:05 UTCJul 24, 21:00 UTC55m
2026-07-24 ENY3441 GSP → MIA Jul 24, 19:59 UTCJul 24, 21:13 UTC1h 14m
2026-07-24 ENY3441 GSP → MIA Jul 24, 17:45 UTCJul 24, 18:45 UTC1h 0m
2026-07-24 ENY3616 DFW → HRL Jul 24, 15:35 UTCJul 24, 16:20 UTC45m
2026-07-24 ENY3616 DFW → HRL Jul 24, 13:40 UTCJul 24, 14:25 UTC45m
2026-07-24 ENY3360 - Jul 24, 11:15 UTCJul 24, 12:20 UTC1h 5m
2026-07-24 ENY3359 ORD → BDL Jul 24, 03:35 UTCJul 24, 04:30 UTC55m
2026-07-24 ENY3890 CVG → CLT Jul 24, 01:20 UTCJul 24, 02:30 UTC1h 10m
2026-07-24 ENY3890 CVG → CLT Jul 24, 01:09 UTCJul 24, 02:21 UTC1h 12m
2026-07-23 ENY3890 CVG → CLT Jul 23, 22:25 UTCJul 23, 23:25 UTC1h 0m
2026-07-23 ENY3506 - Jul 23, 20:10 UTCJul 23, 21:15 UTC1h 5m
2026-07-23 ENY3506 ELP → DFW Jul 23, 19:51 UTCJul 23, 21:14 UTC1h 23m
2026-07-23 ENY3506 - Jul 23, 17:30 UTCJul 23, 18:25 UTC55m
2026-07-23 ENY3389 - Jul 23, 15:40 UTCJul 23, 16:20 UTC40m
2026-07-23 ENY3389 AMA → DFW Jul 23, 15:30 UTCJul 23, 16:19 UTC49m
2026-07-23 ENY3389 - Jul 23, 13:40 UTCJul 23, 14:20 UTC40m
2026-07-23 ENY3725 - Jul 23, 11:05 UTCJul 23, 11:50 UTC45m
2026-07-23 ENY3724 MIA → MSY Jul 23, 03:25 UTCJul 23, 04:05 UTC40m
2026-07-23 ENY3347 DFW → CVG Jul 23, 00:55 UTCJul 23, 02:15 UTC1h 20m
2026-07-22 ENY3347 DFW → CVG Jul 22, 21:55 UTCJul 22, 23:15 UTC1h 20m
2026-07-22 ENY4263 DFW → VER Jul 22, 18:00 UTCJul 22, 20:05 UTC2h 5m
2026-07-22 ENY4263 DFW → VER Jul 22, 14:55 UTCJul 22, 17:00 UTC2h 5m
2026-07-22 ENY3424 SGF → DFW Jul 22, 12:15 UTCJul 22, 13:25 UTC1h 10m
2026-07-22 ENY3671 MIA → CVG Jul 22, 00:15 UTCJul 22, 01:15 UTC1h 0m
2026-07-21 ENY3583 IAH → DFW Jul 21, 21:25 UTCJul 21, 22:15 UTC50m
2026-07-21 ENY3583 - Jul 21, 19:45 UTCJul 21, 20:25 UTC40m
2026-07-21 ENY3451 DAB → DFW Jul 21, 16:35 UTCJul 21, 18:10 UTC1h 35m
2026-07-21 ENY3451 DAB → DFW Jul 21, 14:00 UTCJul 21, 15:40 UTC1h 40m
2026-07-21 ENY3353 - Jul 21, 11:00 UTCJul 21, 12:15 UTC1h 15m
2026-07-21 ENY3353 BRO → DFW Jul 21, 10:56 UTCJul 21, 12:10 UTC1h 14m
2026-07-21 ENY3412 - Jul 21, 03:55 UTCJul 21, 05:00 UTC1h 5m
2026-07-21 ENY3412 DFW → BRO Jul 21, 03:54 UTCJul 21, 05:01 UTC1h 7m
2026-07-21 ENY3843 CVG → DFW Jul 21, 01:35 UTCJul 21, 02:25 UTC50m
2026-07-20 ENY3843 CVG → DFW Jul 20, 23:55 UTCJul 21, 00:40 UTC45m
2026-07-20 ENY3618 - Jul 20, 20:25 UTCJul 20, 21:20 UTC55m
2026-07-20 ENY3618 LBB → DFW Jul 20, 20:18 UTCJul 20, 21:16 UTC58m

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 N217NN page for operator, model, and routing details .

Mode-S A1D4BC frequently asked

What is Mode-S code A1D4BC?
A1D4BC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N217NN.
Where is Mode-S A1D4BC registered?
Mode-S code A1D4BC 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 A1D4BC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D4BC, octal 50352274, decimal 10,605,756.
What flights does A1D4BC operate?
Mode-S A1D4BC has broadcast 20 distinct callsigns, including ENY3374, ENY3733, ENY3618, ENY3605, ENY3394.