Apparatus

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sensors Mode-S transponder

A2B691

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N274NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A2B691
Octal
50533221
Decimal
10,663,569
Country
US
Tail
N274NN
Type
E75L
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
758
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A2B691.

Country allocation

The ICAO 24-bit address A2B691 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
ENY3581 - 8 2026-07-02
ENY4138 - 7 2026-07-01
ENY4071 - 7 2026-06-14
ENY4048 Envoy Air 7 2026-06-06
ENY3986 Envoy Air 7 2026-07-22
ENY4186 Envoy Air 6 2026-04-17
ENY4139 - 6 2026-06-14
ENY3824 - 6 2026-07-01
ENY3633 - 6 2026-06-17
ENY3434 Envoy Air 6 2026-07-21
ENY3406 - 6 2026-07-14
ENY3368 Envoy Air 6 2026-07-24
ENY3352 - 6 2026-07-02
ENY4171 - 5 2026-07-04
ENY4114 Envoy Air 5 2026-05-14
ENY4106 Envoy Air 5 2026-06-09
ENY4080 - 5 2026-06-25
ENY4003 Envoy Air 5 2026-05-28
ENY3976 - 5 2026-06-30
ENY3927 Envoy Air 5 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3653 LAN → ORD Jul 26, 20:55 UTCJul 26, 21:35 UTC40m
2026-07-26 ENY3384 CHS → DCA Jul 26, 18:40 UTCJul 26, 19:25 UTC45m
2026-07-26 ENY3384 CHS → DCA Jul 26, 16:45 UTCJul 26, 17:20 UTC35m
2026-07-26 ENY3628 ATL → DCA Jul 26, 14:30 UTCJul 26, 15:15 UTC45m
2026-07-26 ENY3628 ATL → DCA Jul 26, 12:25 UTCJul 26, 13:10 UTC45m
2026-07-26 ENY3631 ORD → ALB Jul 26, 01:30 UTCJul 26, 02:10 UTC40m
2026-07-26 ENY3631 ORD → ALB Jul 26, 01:19 UTCJul 26, 02:05 UTC46m
2026-07-25 ENY3627 DCA → LIT Jul 25, 21:15 UTCJul 25, 23:10 UTC1h 55m
2026-07-25 ENY3627 DCA → LIT Jul 25, 21:13 UTCJul 25, 23:14 UTC2h 1m
2026-07-25 ENY3668 AVL → MIA Jul 25, 17:40 UTCJul 25, 18:30 UTC50m
2026-07-25 ENY3668 AVL → MIA Jul 25, 17:39 UTCJul 25, 18:31 UTC52m
2026-07-25 ENY3668 AVL → MIA Jul 25, 15:45 UTCJul 25, 16:40 UTC55m
2026-07-25 ENY3630 LIT → DCA Jul 25, 11:40 UTCJul 25, 13:30 UTC1h 50m
2026-07-25 ENY3630 LIT → DCA Jul 25, 11:32 UTCJul 25, 13:29 UTC1h 57m
2026-07-25 ENY3881 IND → ORD Jul 25, 01:00 UTCJul 25, 01:35 UTC35m
2026-07-24 ENY3400 GRR → ORD Jul 24, 22:10 UTCJul 24, 23:00 UTC50m
2026-07-24 ENY3400 GRR → ORD Jul 24, 22:09 UTCJul 24, 22:53 UTC44m
2026-07-24 ENY3400 GRR → ORD Jul 24, 20:30 UTCJul 24, 21:05 UTC35m
2026-07-24 ENY3368 ATW → CLT Jul 24, 18:45 UTCJul 24, 19:20 UTC35m
2026-07-24 ENY3368 ATW → CLT Jul 24, 18:37 UTCJul 24, 19:15 UTC38m
2026-07-24 ENY3368 ATW → CLT Jul 24, 17:15 UTCJul 24, 17:35 UTC20m
2026-07-24 ENY3801 PIT → MIA Jul 24, 15:10 UTCJul 24, 16:05 UTC55m
2026-07-24 ENY3801 PIT → MIA Jul 24, 12:40 UTCJul 24, 13:40 UTC1h 0m
2026-07-24 ENY3919 GRK → DFW Jul 24, 10:15 UTCJul 24, 10:45 UTC30m
2026-07-24 ENY3957 DCA → XNA Jul 24, 02:55 UTCJul 24, 03:15 UTC20m
2026-07-23 ENY3381 BOS → CMH Jul 23, 23:45 UTCJul 24, 01:20 UTC1h 35m
2026-07-23 ENY3381 BOS → CMH Jul 23, 23:44 UTCJul 24, 01:16 UTC1h 32m
2026-07-23 ENY3381 BOS → CMH Jul 23, 21:35 UTCJul 23, 22:55 UTC1h 20m
2026-07-23 ENY3636 RDU → ORD Jul 23, 19:35 UTCJul 23, 20:20 UTC45m
2026-07-23 ENY3636 RDU → ORD Jul 23, 17:30 UTCJul 23, 18:05 UTC35m
2026-07-23 ENY3366 MSN → ORD Jul 23, 15:40 UTCJul 23, 16:10 UTC30m
2026-07-23 ENY3366 MSN → ORD Jul 23, 15:33 UTCJul 23, 16:12 UTC39m
2026-07-23 ENY3366 MSN → ORD Jul 23, 14:20 UTCJul 23, 14:40 UTC20m
2026-07-23 ENY3397 FAR → DFW Jul 23, 00:55 UTCJul 23, 02:30 UTC1h 35m
2026-07-23 ENY3397 FAR → DFW Jul 23, 00:52 UTCJul 23, 02:22 UTC1h 30m
2026-07-22 ENY3397 FAR → DFW Jul 22, 22:15 UTCJul 22, 23:40 UTC1h 25m
2026-07-22 ENY3986 HRL → DFW Jul 22, 18:10 UTCJul 22, 20:10 UTC2h 0m
2026-07-22 ENY3986 HRL → DFW Jul 22, 15:05 UTCJul 22, 17:00 UTC1h 55m
2026-07-22 ENY3525 DFW → GRR Jul 22, 12:15 UTCJul 22, 13:30 UTC1h 15m
2026-07-22 ENY3525 DFW → GRR Jul 22, 12:09 UTCJul 22, 13:21 UTC1h 12m
2026-07-22 ENY4282 STL → ORD Jul 22, 01:55 UTCJul 22, 02:50 UTC55m
2026-07-21 ENY3434 DFW → MTY Jul 21, 22:05 UTCJul 21, 23:40 UTC1h 35m
2026-07-21 ENY3434 DFW → MTY Jul 21, 22:02 UTCJul 21, 23:35 UTC1h 33m
2026-07-21 ENY3434 DFW → MTY Jul 21, 19:20 UTCJul 21, 20:45 UTC1h 25m
2026-07-21 ENY3340 DFW → SDF Jul 21, 16:35 UTCJul 21, 17:50 UTC1h 15m
2026-07-21 ENY3703 ORD → BOS Jul 21, 13:50 UTCJul 21, 15:05 UTC1h 15m
2026-07-21 ENY3394 - Jul 21, 10:15 UTCJul 21, 11:35 UTC1h 20m
2026-07-21 ENY4278 DFW → HSV Jul 21, 03:00 UTCJul 21, 04:25 UTC1h 25m
2026-07-21 ENY3504 XNA → DFW Jul 21, 00:10 UTCJul 21, 01:20 UTC1h 10m
2026-07-20 ENY3504 XNA → DFW Jul 20, 23:54 UTCJul 21, 01:21 UTC1h 27m

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 N274NN page for operator, model, and routing details .

Mode-S A2B691 frequently asked

What is Mode-S code A2B691?
A2B691 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N274NN.
Where is Mode-S A2B691 registered?
Mode-S code A2B691 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 A2B691 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B691, octal 50533221, decimal 10,663,569.
What flights does A2B691 operate?
Mode-S A2B691 has broadcast 20 distinct callsigns, including ENY3581, ENY4138, ENY4071, ENY4048, ENY3986.