Apparatus

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sensors Mode-S transponder

AA6BA4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77019 · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA6BA4
Octal
52465644
Decimal
11,168,676
Country
US
Tail
N77019
Type
B772
No current signal · last broadcast 26d ago
Flights observed
159
Distinct callsigns
20
Country
US
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S AA6BA4.

Country allocation

The ICAO 24-bit address AA6BA4 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
UAL804 United Airlines 10 2026-06-04
UAL130 United Airlines 9 2026-06-07
UAL984 United Airlines 7 2026-05-24
UAL876 United Airlines 7 2026-06-11
UAL875 United Airlines 7 2026-06-03
UAL949 - 6 2026-06-13
UAL926 United Airlines 6 2026-05-05
UAL924 United Airlines 6 2026-06-13
UAL18 - 5 2026-04-13
UAL900 United Airlines 4 2026-04-30
UAL852 United Airlines 4 2026-05-31
UAL803 United Airlines 4 2026-06-06
UAL54 United Airlines 4 2026-06-08
UAL149 United Airlines 4 2026-06-09
UAL148 United Airlines 4 2026-06-10
UAL96 United Airlines 3 2026-06-02
UAL933 United Airlines 3 2026-04-18
UAL917 United Airlines 3 2026-06-14
UAL901 United Airlines 3 2026-04-29
UAL853 United Airlines 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-18 UA1234 - Jun 18, 01:00 UTCJun 18, 01:30 UTC30m
2026-06-15 UAL3938 SEA → SFO Jun 15, 15:50 UTCJun 16, 05:59 UTC14h 10m
2026-06-15 UAL916 AKL → SFO Jun 15, 02:04 UTCJun 15, 13:30 UTC11h 25m
2026-06-14 UAL917 SFO → AKL Jun 14, 06:41 UTCJun 14, 19:16 UTC12h 35m
2026-06-14 UAL917 SFO → AKL Jun 14, 06:40 UTCJun 14, 19:00 UTC12h 20m
2026-06-13 UAL949 - Jun 13, 15:25 UTCJun 14, 01:25 UTC10h 0m
2026-06-13 UAL924 IAD → LHR Jun 13, 06:40 UTCJun 13, 08:45 UTC2h 5m
2026-06-13 UAL924 IAD → LHR Jun 13, 06:28 UTCJun 13, 13:17 UTC6h 49m
2026-06-12 UAL914 CDG → IAD Jun 12, 10:40 UTCJun 12, 18:20 UTC7h 40m
2026-06-11 UAL990 SFO → CDG Jun 11, 22:10 UTCJun 12, 08:20 UTC10h 11m
2026-06-11 UAL876 HND → SFO Jun 11, 07:15 UTCJun 11, 16:23 UTC9h 8m
2026-06-11 UAL876 HND → SFO Jun 11, 07:20 UTCJun 11, 16:25 UTC9h 5m
2026-06-10 UAL131 EWR → HND Jun 10, 15:05 UTCJun 11, 04:15 UTC13h 10m
2026-06-10 UAL148 GRU → EWR Jun 10, 00:21 UTCJun 10, 09:24 UTC9h 3m
2026-06-10 UAL148 GRU → EWR Jun 10, 00:20 UTCJun 10, 09:30 UTC9h 10m
2026-06-10 UAL148 GRU → EWR Jun 10, 00:21 UTCJun 10, 09:25 UTC9h 4m
2026-06-09 UAL149 EWR → GRU Jun 9, 01:41 UTCJun 9, 10:20 UTC8h 39m
2026-06-09 UAL149 EWR → GRU Jun 9, 01:35 UTCJun 9, 04:45 UTC3h 10m
2026-06-08 UAL55 CDG → EWR Jun 8, 11:45 UTCJun 8, 18:55 UTC7h 10m
2026-06-08 UAL54 EWR → CDG Jun 8, 02:20 UTCJun 8, 08:45 UTC6h 25m
2026-06-07 UAL130 HND → EWR Jun 7, 09:20 UTCJun 7, 21:55 UTC12h 35m
2026-06-07 UAL130 HND → EWR Jun 7, 09:10 UTCJun 7, 21:54 UTC12h 44m
2026-06-06 UAL803 IAD → HND Jun 6, 17:15 UTCJun 7, 06:50 UTC13h 35m
2026-06-04 UAL804 HND → IAD Jun 4, 07:25 UTCJun 4, 19:45 UTC12h 20m
2026-06-03 UAL875 SFO → HND Jun 3, 18:25 UTCJun 4, 04:40 UTC10h 15m
2026-06-03 UAL97 BNE → SFO Jun 3, 00:40 UTCJun 3, 13:10 UTC12h 30m
2026-06-03 UAL97 BNE → SFO Jun 3, 00:43 UTCJun 3, 13:08 UTC12h 25m
2026-06-02 UAL96 SFO → BNE Jun 2, 20:45 UTCJun 2, 21:00 UTC15m
2026-06-02 UAL96 SFO → BNE Jun 2, 07:26 UTCJun 2, 20:55 UTC13h 29m
2026-06-02 UAL96 SFO → BNE Jun 2, 07:25 UTCJun 2, 08:05 UTC40m
2026-06-01 UAL673 SFO → BOS Jun 1, 14:45 UTCJun 2, 01:40 UTC10h 55m
2026-06-01 UAL672 EWR → ATL Jun 1, 01:20 UTCJun 1, 12:10 UTC10h 50m
2026-05-31 UAL852 TPE → SAN May 31, 08:25 UTCMay 31, 17:25 UTC9h 0m
2026-05-30 UAL853 SFO → TPE May 30, 07:45 UTCMay 30, 20:40 UTC12h 55m
2026-05-29 UAL506 MSN → DEN May 29, 16:05 UTCMay 30, 04:50 UTC12h 45m
2026-05-29 UAL507 DEN → LGA May 29, 01:00 UTCMay 29, 12:25 UTC11h 25m
2026-05-28 UAL195 MUC → SFO May 28, 10:00 UTCMay 28, 21:15 UTC11h 15m
2026-05-28 UAL195 MUC → SFO May 28, 10:02 UTCMay 28, 21:16 UTC11h 14m
2026-05-27 UAL102 IAH → MUC May 27, 22:30 UTCMay 28, 08:20 UTC9h 50m
2026-05-27 UAL879 LHR → IAH May 27, 09:20 UTCMay 27, 19:00 UTC9h 40m
2026-05-26 UAL880 IAH → LHR May 26, 22:20 UTCMay 27, 07:15 UTC8h 56m
2026-05-25 UAL160 MUC → IAH May 25, 10:40 UTCMay 25, 21:40 UTC10h 59m
2026-05-24 UAL194 SFO → MUC May 24, 21:25 UTCMay 25, 07:50 UTC10h 25m
2026-05-24 UAL984 CDG → SFO May 24, 07:39 UTCMay 24, 18:06 UTC10h 27m
2026-05-24 UAL984 CDG → SFO May 24, 07:20 UTCMay 24, 14:05 UTC6h 45m
2026-05-23 UAL57 EWR → CDG May 23, 22:20 UTCMay 24, 04:45 UTC6h 25m
2026-05-23 UAL55 CDG → EWR May 23, 11:30 UTCMay 23, 19:05 UTC7h 35m
2026-05-23 UAL54 EWR → CDG May 23, 02:04 UTCMay 23, 08:10 UTC6h 6m
2026-05-23 UAL54 EWR → CDG May 23, 02:00 UTCMay 23, 03:25 UTC1h 25m
2026-05-22 UAL55 CDG → EWR May 22, 11:35 UTCMay 22, 19:05 UTC7h 30m

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 N77019 page for operator, model, and routing details .

Mode-S AA6BA4 frequently asked

What is Mode-S code AA6BA4?
AA6BA4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77019.
Where is Mode-S AA6BA4 registered?
Mode-S code AA6BA4 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 AA6BA4 broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA6BA4, octal 52465644, decimal 11,168,676.
What flights does AA6BA4 operate?
Mode-S AA6BA4 has broadcast 20 distinct callsigns, including UAL804, UAL130, UAL984, UAL876, UAL875.