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 1h ago
Flights observed
238
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
UAL1909 United Airlines 3 2026-06-20
UAL1896 - 3 2026-06-29
UAL1627 - 3 2026-06-24
UAL1310 - 3 2026-06-24
UAL1049 - 3 2026-06-15
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
UAL589K United Airlines 2 2026-06-05
UAL493 - 2 2026-06-28
UAL476 United Airlines 2 2026-06-02
UAL469 United Airlines 2 2026-06-01
UAL464 - 2 2026-06-19
UAL436T United Airlines 2 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1172 - Jul 14, 01:45 UTCJul 14, 03:35 UTC1h 50m
2026-07-13 UAL1390 ORF → DEN Jul 13, 20:35 UTCJul 13, 23:45 UTC3h 10m
2026-07-13 UAL2011 DEN → ORF Jul 13, 16:01 UTCJul 13, 19:14 UTC3h 13m
2026-07-13 UAL2011 DEN → ORF Jul 13, 16:05 UTCJul 13, 19:15 UTC3h 10m
2026-07-13 UAL1188 - Jul 13, 12:10 UTCJul 13, 14:05 UTC1h 55m
2026-07-13 UAL1588 DEN → RDM Jul 13, 02:10 UTCJul 13, 04:00 UTC1h 50m
2026-07-12 UAL2239 - Jul 12, 19:50 UTCJul 12, 23:25 UTC3h 35m
2026-07-12 UAL2195 - Jul 12, 16:25 UTCJul 12, 18:10 UTC1h 45m
2026-07-12 UAL2151 PDX → DEN Jul 12, 13:25 UTCJul 12, 13:55 UTC30m
2026-07-12 UAL630 - Jul 12, 04:10 UTCJul 12, 04:40 UTC30m
2026-07-12 UAL1621 MCO → ORD Jul 12, 00:01 UTCJul 12, 02:35 UTC2h 35m
2026-07-11 UAL1811 - Jul 11, 18:00 UTCJul 11, 20:30 UTC2h 30m
2026-07-11 UAL2201 DCA → ORD Jul 11, 14:40 UTCJul 11, 16:25 UTC1h 45m
2026-07-11 UAL1077 ORD → DCA Jul 11, 11:25 UTCJul 11, 12:45 UTC1h 20m
2026-07-11 UAL3889 - Jul 11, 06:50 UTCJul 11, 07:10 UTC20m
2026-07-11 UAL3889 RFD → ORD Jul 11, 05:50 UTCJul 11, 06:54 UTC1h 4m
2026-07-03 UAL3860 EWR → RFD Jul 3, 04:21 UTCJul 3, 06:05 UTC1h 44m
2026-07-03 UAL3860 - Jul 3, 04:05 UTCJul 3, 06:20 UTC2h 15m
2026-07-02 UAL3859 LGA → EWR Jul 2, 01:10 UTCJul 2, 01:25 UTC15m
2026-06-30 UAL2181 - Jun 30, 17:25 UTCJun 30, 20:40 UTC3h 15m
2026-06-30 UAL2181 IAH → LGA Jun 30, 17:21 UTCJun 30, 20:35 UTC3h 14m
2026-06-30 UAL2228 - Jun 30, 13:35 UTCJun 30, 15:15 UTC1h 40m
2026-06-30 UAL1596 - Jun 30, 03:00 UTCJun 30, 04:05 UTC1h 5m
2026-06-29 UAL325 SEA → DEN Jun 29, 22:59 UTCJun 30, 01:09 UTC2h 10m
2026-06-29 UAL325 - Jun 29, 19:00 UTCJun 29, 21:14 UTC2h 15m
2026-06-29 UAL1896 - Jun 29, 16:29 UTCJun 29, 17:19 UTC50m
2026-06-29 UAL1896 PDX → SFO Jun 29, 12:55 UTCJun 29, 14:14 UTC1h 20m
2026-06-28 UAL1677 ORD → PDX Jun 28, 21:45 UTCJun 29, 01:34 UTC3h 50m
2026-06-28 UAL493 CMH → ORD Jun 28, 18:46 UTCJun 28, 18:57 UTC11m
2026-06-28 UAL493 - Jun 28, 18:19 UTCJun 28, 18:29 UTC10m
2026-06-28 UAL2849 - Jun 28, 16:14 UTCJun 28, 17:00 UTC45m
2026-06-28 UAL1811 - Jun 28, 12:15 UTCJun 28, 14:14 UTC2h 0m
2026-06-27 UAL1776 - Jun 27, 23:25 UTCJun 28, 00:55 UTC1h 30m
2026-06-27 UAL2199 LGA → DEN Jun 27, 18:45 UTCJun 27, 20:56 UTC2h 11m
2026-06-27 UAL2199 LGA → DEN Jun 27, 19:00 UTCJun 27, 21:15 UTC2h 15m
2026-06-27 UAL669 ORD → LGA Jun 27, 15:45 UTCJun 27, 17:15 UTC1h 30m
2026-06-27 UAL669 ORD → LGA Jun 27, 15:34 UTCJun 27, 17:14 UTC1h 40m
2026-06-27 UAL211 LGA → ORD Jun 27, 11:39 UTCJun 27, 13:44 UTC2h 5m
2026-06-27 UAL2458 ORD → LGA Jun 27, 02:07 UTCJun 27, 03:36 UTC1h 29m
2026-06-27 UAL2458 ORD → LGA Jun 27, 01:59 UTCJun 27, 03:34 UTC1h 35m
2026-06-26 UAL2821 - Jun 26, 23:09 UTCJun 26, 23:19 UTC10m
2026-06-26 UAL2821 ORF → ORD Jun 26, 21:32 UTCJun 26, 22:52 UTC1h 20m
2026-06-26 UAL2821 ORF → ORD Jun 26, 21:20 UTCJun 26, 23:19 UTC2h 0m
2026-06-26 UAL2807 ORD → ORF Jun 26, 17:51 UTCJun 26, 19:24 UTC1h 33m
2026-06-26 UAL2807 ORD → ORF Jun 26, 17:44 UTCJun 26, 19:24 UTC1h 40m
2026-06-26 UAL2735 LAX → SFO Jun 26, 02:54 UTCJun 26, 14:50 UTC11h 55m
2026-06-25 UAL2628 PHX → ORD Jun 25, 20:45 UTCJun 25, 23:44 UTC3h 0m
2026-06-25 UAL2822 ORD → PHX Jun 25, 15:50 UTCJun 25, 19:09 UTC3h 20m
2026-06-25 UAL1491 - Jun 25, 13:00 UTCJun 25, 13:59 UTC1h 0m
2026-06-25 UAL1338 - Jun 25, 01:54 UTCJun 25, 02:59 UTC1h 5m

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 1h ago.
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.