Apparatus

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sensors Mode-S transponder

AA92FB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N78004 · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA92FB
Octal
52511373
Decimal
11,178,747
Country
US
Tail
N78004
Type
B772
Transponder active on ground
Flights observed
232
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AA92FB.

Country allocation

The ICAO 24-bit address AA92FB 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
UAL875 - 10 2026-07-13
UAL804 - 10 2026-06-13
UAL149 - 10 2026-07-06
UAL932 - 9 2026-07-12
UAL876 - 9 2026-07-02
UAL41 United Airlines 9 2026-04-19
UAL97 - 8 2026-07-01
UAL915 United Airlines 8 2026-04-25
UAL131 - 8 2026-06-19
UAL990 - 7 2026-07-04
UAL40 United Airlines 7 2026-04-26
UAL148 - 7 2026-07-07
UAL900 United Airlines 6 2026-04-16
UAL803 United Airlines 6 2026-06-14
UAL673 - 6 2026-06-27
UAL927 - 5 2026-07-12
UAL672 - 5 2026-06-27
UAL59 - 5 2026-06-21
UAL56 United Airlines 5 2026-04-26
UAL45 United Airlines 5 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL875 SFO → HND Jul 13, 18:45 UTCJul 14, 04:36 UTC9h 51m
2026-07-13 UAL875 SFO → HND Jul 13, 18:40 UTCJul 14, 04:40 UTC10h 0m
2026-07-12 UAL927 - Jul 12, 15:55 UTCJul 12, 16:45 UTC50m
2026-07-12 UAL927 FRA → SFO Jul 12, 15:51 UTCJul 13, 02:47 UTC10h 56m
2026-07-12 UAL932 IAD → FRA Jul 12, 03:33 UTCJul 12, 10:40 UTC7h 7m
2026-07-12 UAL932 - Jul 12, 03:25 UTCJul 12, 08:45 UTC5h 20m
2026-07-11 UAL933 FRA → IAD Jul 11, 16:00 UTCJul 12, 00:25 UTC8h 25m
2026-07-11 UAL46 - Jul 11, 04:15 UTCJul 11, 13:25 UTC9h 10m
2026-07-10 UAL879 - Jul 10, 09:45 UTCJul 10, 19:15 UTC9h 30m
2026-07-09 UAL14 EWR → LHR Jul 9, 23:35 UTCJul 10, 05:48 UTC6h 13m
2026-07-09 UAL14 - Jul 9, 23:45 UTCJul 10, 05:55 UTC6h 10m
2026-07-09 UAL18 MXP → EWR Jul 9, 08:06 UTCJul 9, 16:07 UTC8h 1m
2026-07-09 UAL18 MXP → EWR Jul 9, 07:55 UTCJul 9, 16:10 UTC8h 15m
2026-07-08 UAL19 EWR → MXP Jul 8, 22:03 UTCJul 9, 05:16 UTC7h 13m
2026-07-08 UAL19 - Jul 8, 21:50 UTCJul 8, 22:45 UTC55m
2026-07-08 UAL22 DUB → EWR Jul 8, 09:30 UTCJul 8, 16:00 UTC6h 30m
2026-07-08 UAL23 EWR → DUB Jul 8, 01:35 UTCJul 8, 07:25 UTC5h 50m
2026-07-07 UAL148 - Jul 7, 01:20 UTCJul 7, 01:55 UTC35m
2026-07-07 UAL148 GRU → EWR Jul 7, 01:10 UTCJul 7, 10:06 UTC8h 56m
2026-07-06 UAL149 - Jul 6, 22:25 UTCJul 6, 22:50 UTC25m
2026-07-06 UAL149 - Jul 6, 14:00 UTCJul 6, 20:40 UTC6h 40m
2026-07-05 UAL55 - Jul 5, 11:30 UTCJul 5, 12:45 UTC1h 15m
2026-07-05 UAL55 CDG → EWR Jul 5, 11:34 UTCJul 5, 19:03 UTC7h 29m
2026-07-04 UAL990 SFO → CDG Jul 4, 22:50 UTCJul 5, 08:55 UTC10h 5m
2026-07-04 UAL916 AKL → SFO Jul 4, 02:00 UTCJul 4, 02:30 UTC30m
2026-07-04 UAL916 AKL → SFO Jul 4, 02:11 UTCJul 4, 13:20 UTC11h 9m
2026-07-03 UAL917 SFO → AKL Jul 3, 06:55 UTCJul 3, 19:30 UTC12h 35m
2026-07-02 UAL876 HND → SFO Jul 2, 07:15 UTCJul 2, 17:00 UTC9h 45m
2026-07-02 UAL876 HND → SFO Jul 2, 07:25 UTCJul 2, 17:05 UTC9h 40m
2026-07-01 UAL875 SFO → HND Jul 1, 18:40 UTCJul 2, 05:15 UTC10h 35m
2026-07-01 UAL97 BNE → SFO Jul 1, 01:08 UTCJul 1, 13:43 UTC12h 35m
2026-07-01 UAL97 - Jul 1, 01:15 UTCJul 1, 13:45 UTC12h 30m
2026-06-30 UAL96 SFO → BNE Jun 30, 07:25 UTCJun 30, 20:50 UTC13h 25m
2026-06-29 UAL34 KIX → SFO Jun 29, 08:24 UTCJun 29, 17:59 UTC9h 35m
2026-06-28 UAL35 SFO → KIX Jun 28, 18:44 UTCJun 29, 05:45 UTC11h 0m
2026-06-27 UAL673 BCN → SFO Jun 27, 14:31 UTCJun 28, 01:56 UTC11h 25m
2026-06-27 UAL673 - Jun 27, 14:29 UTCJun 27, 17:49 UTC3h 20m
2026-06-27 UAL672 SFO → BCN Jun 27, 01:29 UTCJun 27, 12:10 UTC10h 41m
2026-06-27 UAL672 SFO → BCN Jun 27, 01:19 UTCJun 27, 12:09 UTC10h 50m
2026-06-26 UAL45 ZRH → SFO Jun 26, 01:15 UTCJun 26, 06:50 UTC5h 35m
2026-06-25 UAL45 ZRH → SFO Jun 25, 12:07 UTCJun 25, 23:34 UTC11h 27m
2026-06-25 UAL45 ZRH → SFO Jun 25, 15:24 UTCJun 25, 17:05 UTC1h 40m
2026-06-24 UAL44 SFO → ZRH Jun 24, 22:14 UTCJun 25, 08:40 UTC10h 25m
2026-06-24 UAL852 - Jun 24, 17:14 UTCJun 24, 17:59 UTC45m
2026-06-24 UAL852 TPE → SFO Jun 24, 06:51 UTCJun 24, 17:56 UTC11h 5m
2026-06-24 UAL852 - Jun 24, 06:35 UTCJun 24, 06:45 UTC10m
2026-06-23 UAL853 - Jun 23, 07:29 UTCJun 23, 19:50 UTC12h 20m
2026-06-22 UAL673 BCN → SFO Jun 22, 14:41 UTCJun 23, 02:46 UTC12h 5m
2026-06-22 UAL673 BCN → SFO Jun 22, 14:41 UTCJun 23, 02:43 UTC12h 2m
2026-06-22 UAL673 - Jun 22, 15:24 UTCJun 22, 19:09 UTC3h 45m

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 N78004 page for operator, model, and routing details .

Mode-S AA92FB frequently asked

What is Mode-S code AA92FB?
AA92FB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N78004.
Where is Mode-S AA92FB registered?
Mode-S code AA92FB 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 AA92FB broadcasting right now?
Mode-S AA92FB is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA92FB, octal 52511373, decimal 11,178,747.
What flights does AA92FB operate?
Mode-S AA92FB has broadcast 20 distinct callsigns, including UAL875, UAL804, UAL149, UAL932, UAL876.