Apparatus

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sensors Mode-S transponder

AA99B7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N782UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA99B7
Octal
52514667
Decimal
11,180,471
Country
US
Tail
N782UA
Type
B772
No current signal · last broadcast 5h ago
Flights observed
228
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S AA99B7.

Country allocation

The ICAO 24-bit address AA99B7 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
UAL71 - 10 2026-06-30
UAL942 - 9 2026-06-20
UAL918 - 9 2026-07-13
UAL46 - 9 2026-07-03
UAL4 - 9 2026-07-09
UAL990 United Airlines 7 2026-05-24
UAL914 United Airlines 7 2026-05-25
UAL70 United Airlines 7 2026-06-29
UAL195 United Airlines 7 2026-06-09
UAL102 United Airlines 7 2026-06-08
UAL943 United Airlines 6 2026-06-20
UAL924 United Airlines 6 2026-06-06
UAL880 - 6 2026-07-10
UAL818 - 6 2026-07-06
UAL948 - 5 2026-06-19
UAL879 United Airlines 5 2026-06-08
UAL819 - 5 2026-07-05
UAL5 - 5 2026-07-09
UAL47 - 5 2026-07-03
UAL23 - 5 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL918 IAD → LHR Jul 13, 22:50 UTCJul 14, 05:45 UTC6h 55m
2026-07-13 UAL885 - Jul 13, 08:50 UTCJul 13, 17:55 UTC9h 5m
2026-07-12 UAL884 - Jul 12, 22:10 UTCJul 13, 06:40 UTC8h 30m
2026-07-12 UAL884 IAD → FCO Jul 12, 21:58 UTCJul 13, 06:38 UTC8h 40m
2026-07-12 UAL885 - Jul 12, 09:05 UTCJul 12, 17:55 UTC8h 50m
2026-07-11 UAL884 IAD → FCO Jul 11, 22:01 UTCJul 12, 06:05 UTC8h 5m
2026-07-11 UAL919 LHR → IAD Jul 11, 11:40 UTCJul 11, 19:15 UTC7h 35m
2026-07-10 UAL880 - Jul 10, 22:05 UTCJul 11, 06:45 UTC8h 40m
2026-07-09 UAL4 - Jul 9, 13:15 UTCJul 9, 23:00 UTC9h 45m
2026-07-09 UAL5 - Jul 9, 10:25 UTCJul 9, 10:35 UTC10m
2026-07-09 UAL5 - Jul 9, 01:35 UTCJul 9, 05:35 UTC4h 0m
2026-07-09 UAL5 IAH → LHR Jul 9, 01:36 UTCJul 9, 10:09 UTC8h 33m
2026-07-07 UAL3045 - Jul 7, 11:50 UTCJul 7, 21:45 UTC9h 55m
2026-07-07 UAL3045 LHR → IAH Jul 7, 12:00 UTCJul 7, 21:44 UTC9h 44m
2026-07-06 UAL880 IAH → LHR Jul 6, 21:40 UTCJul 7, 06:25 UTC8h 45m
2026-07-06 UAL818 - Jul 6, 00:15 UTCJul 6, 00:50 UTC35m
2026-07-06 UAL818 EZE → IAH Jul 6, 00:21 UTCJul 6, 10:05 UTC9h 44m
2026-07-05 UAL819 - Jul 5, 01:30 UTCJul 5, 10:15 UTC8h 45m
2026-07-03 UAL47 FRA → IAH Jul 3, 13:06 UTCJul 3, 23:31 UTC10h 25m
2026-07-03 UAL47 FRA → IAH Jul 3, 13:06 UTCJul 3, 23:29 UTC10h 23m
2026-07-03 UAL46 - Jul 3, 00:20 UTCJul 3, 07:45 UTC7h 25m
2026-07-03 UAL46 IAH → FRA Jul 3, 00:23 UTCJul 3, 09:06 UTC8h 43m
2026-07-02 UAL160 - Jul 2, 10:45 UTCJul 2, 21:35 UTC10h 50m
2026-07-01 UAL194 - Jul 1, 21:35 UTCJul 2, 07:50 UTC10h 15m
2026-07-01 UAL984 - Jul 1, 07:50 UTCJul 1, 11:00 UTC3h 10m
2026-07-01 UAL984 CDG → SFO Jul 1, 08:00 UTCJul 1, 18:25 UTC10h 25m
2026-07-01 UAL984 CDG → SFO Jul 1, 08:00 UTCJul 1, 18:28 UTC10h 28m
2026-06-30 UAL57 EWR → CDG Jun 30, 23:00 UTCJul 1, 05:40 UTC6h 40m
2026-06-30 UAL71 - Jun 30, 07:45 UTCJun 30, 14:55 UTC7h 10m
2026-06-29 UAL70 EWR → AMS Jun 29, 23:09 UTCJun 30, 05:20 UTC6h 11m
2026-06-29 UAL71 AMS → EWR Jun 29, 07:27 UTCJun 29, 14:44 UTC7h 17m
2026-06-29 UAL71 - Jun 29, 07:25 UTCJun 29, 14:44 UTC7h 20m
2026-06-28 UAL70 EWR → AMS Jun 28, 22:20 UTCJun 29, 04:34 UTC6h 15m
2026-06-28 UAL22 DUB → EWR Jun 28, 09:05 UTCJun 28, 15:40 UTC6h 35m
2026-06-28 UAL23 - Jun 28, 00:25 UTCJun 28, 05:45 UTC5h 20m
2026-06-28 UAL23 EWR → DUB Jun 28, 00:15 UTCJun 28, 06:04 UTC5h 49m
2026-06-27 UAL71 - Jun 27, 07:39 UTCJun 27, 08:55 UTC1h 15m
2026-06-26 UAL70 EWR → AMS Jun 26, 22:55 UTCJun 27, 05:15 UTC6h 20m
2026-06-26 UAL56 CDG → EWR Jun 26, 08:15 UTCJun 26, 15:39 UTC7h 25m
2026-06-25 UAL915 IAD → CDG Jun 25, 22:51 UTCJun 26, 05:53 UTC7h 2m
2026-06-25 UAL915 - Jun 25, 23:05 UTCJun 26, 00:50 UTC1h 45m
2026-06-25 UAL919 LHR → IAD Jun 25, 11:59 UTCJun 25, 19:34 UTC7h 35m
2026-06-25 UAL919 LHR → IAD Jun 25, 11:40 UTCJun 25, 19:32 UTC7h 52m
2026-06-24 UAL918 IAD → LHR Jun 24, 22:56 UTCJun 25, 05:20 UTC6h 24m
2026-06-24 UAL918 IAD → LHR Jun 24, 22:49 UTCJun 25, 05:29 UTC6h 40m
2026-06-23 UAL131 - Jun 23, 14:44 UTCJun 23, 21:54 UTC7h 10m
2026-06-23 UAL148 - Jun 23, 00:24 UTCJun 23, 09:29 UTC9h 5m
2026-06-23 UAL148 GRU → EWR Jun 23, 00:21 UTCJun 23, 09:30 UTC9h 9m
2026-06-22 UAL149 - Jun 22, 01:35 UTCJun 22, 10:10 UTC8h 35m
2026-06-21 UAL56 CDG → EWR Jun 21, 08:04 UTCJun 21, 15:34 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 N782UA page for operator, model, and routing details .

Mode-S AA99B7 frequently asked

What is Mode-S code AA99B7?
AA99B7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N782UA.
Where is Mode-S AA99B7 registered?
Mode-S code AA99B7 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 AA99B7 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA99B7, octal 52514667, decimal 11,180,471.
What flights does AA99B7 operate?
Mode-S AA99B7 has broadcast 20 distinct callsigns, including UAL71, UAL942, UAL918, UAL46, UAL4.