Apparatus

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sensors Mode-S transponder

AA7427

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77296 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA7427
Octal
52472047
Decimal
11,170,855
Country
US
Tail
N77296
Type
B738
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
306
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S AA7427.

Country allocation

The ICAO 24-bit address AA7427 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
UAL1242 United Airlines 4 2026-06-10
UAL453 - 3 2026-06-20
UAL2821 - 3 2026-06-26
UAL2780 - 3 2026-06-24
UAL2674 United Airlines 3 2026-05-21
UAL2617 United Airlines 3 2026-07-23
UAL2150 - 3 2026-07-23
UAL1909 United Airlines 3 2026-06-20
UAL1896 - 3 2026-06-29
UAL1627 - 3 2026-06-24
UAL1310 - 3 2026-06-24
UAL1236 United Airlines 3 2026-07-25
UAL1199 United Airlines 3 2026-07-20
UAL1049 - 3 2026-06-15
UAL702 - 2 2026-07-20
UAL686 United Airlines 2 2026-05-18
UAL678 United Airlines 2 2026-05-13
UAL669 - 2 2026-06-27
UAL664 United Airlines 2 2026-06-23
UAL640 - 2 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1396 RSW → EWR Jul 26, 19:50 UTCJul 26, 20:30 UTC40m
2026-07-26 UAL1217 IAH → BOS Jul 26, 17:37 UTCJul 26, 18:09 UTC32m
2026-07-26 UAL1217 IAH → BOS Jul 26, 17:25 UTCJul 26, 17:45 UTC20m
2026-07-26 UAL318 EWR → DEN Jul 26, 12:10 UTCJul 26, 15:55 UTC3h 45m
2026-07-25 UAL2348 IAH → LGA Jul 25, 22:30 UTCJul 26, 01:45 UTC3h 15m
2026-07-25 UAL1195 DTW → ORD Jul 25, 18:55 UTCJul 25, 20:05 UTC1h 10m
2026-07-25 UAL361 DEN → BOS Jul 25, 16:25 UTCJul 25, 17:25 UTC1h 0m
2026-07-25 UAL337 DEN → DFW Jul 25, 13:10 UTCJul 25, 14:35 UTC1h 25m
2026-07-25 UAL1236 EWR → PHX Jul 25, 04:10 UTCJul 25, 05:35 UTC1h 25m
2026-07-24 UAL1787 SFO → DEN Jul 24, 23:20 UTCJul 25, 01:40 UTC2h 20m
2026-07-24 UAL2455 EWR → ATL Jul 24, 19:35 UTCJul 24, 21:50 UTC2h 15m
2026-07-24 UAL2004 ORD → SFO Jul 24, 16:45 UTCJul 24, 17:45 UTC1h 0m
2026-07-24 UAL497 CVG → DEN Jul 24, 14:25 UTCJul 24, 15:30 UTC1h 5m
2026-07-24 UAL362 HNL → EWR Jul 24, 10:15 UTCJul 24, 12:10 UTC1h 55m
2026-07-24 UAL214 HNL → SFO Jul 24, 03:25 UTCJul 24, 05:05 UTC1h 40m
2026-07-24 UAL467 BOS → DEN Jul 24, 00:20 UTCJul 24, 02:10 UTC1h 50m
2026-07-23 UAL2150 - Jul 23, 19:35 UTCJul 23, 22:00 UTC2h 25m
2026-07-23 UAL2150 IAH → MSP Jul 23, 19:40 UTCJul 23, 21:52 UTC2h 12m
2026-07-23 UAL2617 SFO → LAX Jul 23, 14:35 UTCJul 23, 17:50 UTC3h 15m
2026-07-23 UAL2617 SFO → LAX Jul 23, 11:20 UTCJul 23, 12:55 UTC1h 35m
2026-07-23 UAL1830 SFO → BNA Jul 23, 02:56 UTCJul 23, 04:52 UTC1h 56m
2026-07-23 UAL1830 SFO → BNA Jul 23, 03:05 UTCJul 23, 05:00 UTC1h 55m
2026-07-23 UAL2306 ORD → BOS Jul 23, 00:05 UTCJul 23, 01:35 UTC1h 30m
2026-07-22 UAL2306 ORD → BOS Jul 22, 23:43 UTCJul 23, 01:34 UTC1h 51m
2026-07-22 UAL1325 DEN → PDX Jul 22, 20:20 UTCJul 22, 22:05 UTC1h 45m
2026-07-22 UAL2668 OMA → ORD Jul 22, 17:30 UTCJul 22, 18:50 UTC1h 20m
2026-07-22 UAL202 PWM → ORD Jul 22, 13:33 UTCJul 22, 15:46 UTC2h 13m
2026-07-22 UAL202 PWM → ORD Jul 22, 13:30 UTCJul 22, 15:45 UTC2h 15m
2026-07-22 UAL1179 IND → IAH Jul 22, 03:25 UTCJul 22, 03:55 UTC30m
2026-07-21 UAL618 EWR → DEN Jul 21, 22:30 UTCJul 22, 01:25 UTC2h 55m
2026-07-21 UAL618 EWR → DEN Jul 21, 22:25 UTCJul 22, 01:17 UTC2h 52m
2026-07-21 UAL1257 DEN → LGA Jul 21, 20:05 UTCJul 21, 21:20 UTC1h 15m
2026-07-21 UAL1113 ORD → MSP Jul 21, 16:40 UTCJul 21, 17:45 UTC1h 5m
2026-07-21 UAL1863 PUJ → ORD Jul 21, 05:10 UTCJul 21, 06:20 UTC1h 10m
2026-07-20 UAL285 BUF → EWR Jul 20, 23:45 UTCJul 21, 03:55 UTC4h 10m
2026-07-20 UAL702 - Jul 20, 16:20 UTCJul 20, 20:45 UTC4h 25m
2026-07-20 UAL500 IND → SFO Jul 20, 10:10 UTCJul 20, 14:10 UTC4h 0m
2026-07-20 UAL1199 EWR → CLT Jul 20, 00:25 UTCJul 20, 02:25 UTC2h 0m
2026-07-19 UAL1199 EWR → CLT Jul 19, 21:35 UTCJul 19, 22:45 UTC1h 10m
2026-07-19 UAL1547 IAD → SAT Jul 19, 17:30 UTCJul 19, 19:05 UTC1h 35m
2026-07-19 UAL1320 SFO → ONT Jul 19, 12:25 UTCJul 19, 15:40 UTC3h 15m
2026-07-19 UAL2350 SAN → ORD Jul 19, 00:52 UTCJul 19, 03:36 UTC2h 44m
2026-07-19 UAL2350 SAN → ORD Jul 19, 00:45 UTCJul 19, 03:30 UTC2h 45m
2026-07-18 UAL1001 - Jul 18, 20:40 UTCJul 18, 23:15 UTC2h 35m
2026-07-18 UAL2185 DEN → PNS Jul 18, 16:50 UTCJul 18, 19:25 UTC2h 35m
2026-07-18 UAL337 - Jul 18, 13:55 UTCJul 18, 15:20 UTC1h 25m
2026-07-18 UAL1236 DEN → PHX Jul 18, 04:45 UTCJul 18, 06:05 UTC1h 20m
2026-07-18 UAL1236 DEN → PHX Jul 18, 04:40 UTCJul 18, 05:58 UTC1h 18m
2026-07-18 UAL467 MSP → DEN Jul 18, 02:00 UTCJul 18, 03:25 UTC1h 26m
2026-07-17 UAL2150 - Jul 17, 20:50 UTCJul 17, 23:00 UTC2h 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 N77296 page for operator, model, and routing details .

Mode-S AA7427 frequently asked

What is Mode-S code AA7427?
AA7427 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77296.
Where is Mode-S AA7427 registered?
Mode-S code AA7427 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 AA7427 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA7427, octal 52472047, decimal 11,170,855.
What flights does AA7427 operate?
Mode-S AA7427 has broadcast 20 distinct callsigns, including UAL1242, UAL453, UAL2821, UAL2780, UAL2674.