Apparatus

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sensors Mode-S transponder

AAD780

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N798UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AAD780
Octal
52553600
Decimal
11,196,288
Country
US
Tail
N798UA
Type
B772
No current signal · last broadcast Jul 26, 15:15 UTC
Flights observed
238
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 15:15 UTC

Last known position

Most recent position reported by Mode-S AAD780.

Country allocation

The ICAO 24-bit address AAD780 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 United Airlines 10 2026-07-26
UAL885 - 9 2026-07-02
UAL819 - 9 2026-07-14
UAL18 - 9 2026-07-20
UAL70 United Airlines 8 2026-07-25
UAL23 United Airlines 8 2026-04-26
UAL22 United Airlines 8 2026-04-26
UAL19 United Airlines 8 2026-07-19
UAL160 - 8 2026-07-07
UAL194 - 7 2026-07-06
UAL948 - 6 2026-06-23
UAL852 - 6 2026-06-17
UAL818 - 6 2026-07-15
UAL55 United Airlines 6 2026-07-24
UAL919 - 5 2026-07-01
UAL884 - 5 2026-07-01
UAL195 United Airlines 5 2026-06-22
UAL102 - 5 2026-06-21
UAL949 - 4 2026-06-23
UAL880 - 4 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL71 AMS → EWR Jul 26, 07:35 UTCJul 26, 15:10 UTC7h 35m
2026-07-25 UAL70 EWR → AMS Jul 25, 22:28 UTCJul 26, 04:40 UTC6h 12m
2026-07-25 UAL70 EWR → AMS Jul 25, 22:30 UTCJul 26, 04:55 UTC6h 25m
2026-07-25 UAL121 BCN → EWR Jul 25, 10:30 UTCJul 25, 18:20 UTC7h 50m
2026-07-24 UAL120 EWR → BCN Jul 24, 23:30 UTCJul 25, 06:30 UTC7h 0m
2026-07-24 UAL55 CDG → EWR Jul 24, 13:10 UTCJul 24, 20:25 UTC7h 15m
2026-07-24 UAL54 EWR → CDG Jul 24, 04:00 UTCJul 24, 10:25 UTC6h 25m
2026-07-23 UAL366 DEN → AUS Jul 23, 21:12 UTCJul 24, 01:57 UTC4h 45m
2026-07-23 UAL366 DEN → AUS Jul 23, 21:20 UTCJul 24, 02:00 UTC4h 40m
2026-07-23 UAL916 AKL → SFO Jul 23, 02:10 UTCJul 23, 13:45 UTC11h 35m
2026-07-22 UAL917 - Jul 22, 18:25 UTCJul 22, 19:15 UTC50m
2026-07-21 UAL984 - Jul 21, 07:40 UTCJul 21, 18:25 UTC10h 45m
2026-07-20 UAL57 - Jul 20, 22:45 UTCJul 21, 05:20 UTC6h 34m
2026-07-20 UAL18 - Jul 20, 16:45 UTCJul 20, 16:50 UTC5m
2026-07-20 UAL18 MXP → EWR Jul 20, 08:22 UTCJul 20, 16:30 UTC8h 8m
2026-07-20 UAL18 MXP → EWR Jul 20, 08:20 UTCJul 20, 16:50 UTC8h 30m
2026-07-19 UAL19 EWR → MXP Jul 19, 22:18 UTCJul 20, 05:39 UTC7h 21m
2026-07-19 UAL19 EWR → MXP Jul 19, 22:35 UTCJul 20, 05:45 UTC7h 10m
2026-07-17 UAL71 AMS → EWR Jul 17, 07:25 UTCJul 17, 14:50 UTC7h 25m
2026-07-17 UAL71 AMS → EWR Jul 17, 07:27 UTCJul 17, 14:41 UTC7h 14m
2026-07-16 UAL70 - Jul 16, 22:45 UTCJul 17, 05:10 UTC6h 25m
2026-07-16 UAL905 - Jul 16, 09:10 UTCJul 16, 16:05 UTC6h 55m
2026-07-15 UAL880 - Jul 15, 21:50 UTCJul 16, 06:45 UTC8h 55m
2026-07-15 UAL818 - Jul 15, 00:15 UTCJul 15, 01:30 UTC1h 15m
2026-07-15 UAL818 EZE → IAH Jul 15, 00:16 UTCJul 15, 09:58 UTC9h 42m
2026-07-15 UAL818 EZE → IAH Jul 15, 00:16 UTCJul 15, 10:04 UTC9h 48m
2026-07-14 UAL819 - Jul 14, 02:10 UTCJul 14, 11:15 UTC9h 5m
2026-07-14 UAL819 IAH → EZE Jul 14, 02:18 UTCJul 14, 11:11 UTC8h 53m
2026-07-13 UAL47 - Jul 13, 12:05 UTCJul 13, 22:15 UTC10h 10m
2026-07-12 UAL46 - Jul 12, 23:45 UTCJul 13, 09:30 UTC9h 45m
2026-07-12 UAL818 - Jul 12, 00:10 UTCJul 12, 09:30 UTC9h 20m
2026-07-11 UAL819 - Jul 11, 03:05 UTCJul 11, 07:20 UTC4h 15m
2026-07-11 UAL819 - Jul 11, 02:00 UTCJul 11, 02:20 UTC20m
2026-07-11 UAL819 IAH → EZE Jul 11, 02:01 UTCJul 11, 11:03 UTC9h 2m
2026-07-10 UAL4 - Jul 10, 13:10 UTCJul 10, 22:45 UTC9h 35m
2026-07-10 UAL5 - Jul 10, 01:35 UTCJul 10, 10:20 UTC8h 45m
2026-07-09 UAL47 - Jul 9, 12:40 UTCJul 9, 23:05 UTC10h 25m
2026-07-09 UAL46 - Jul 9, 00:25 UTCJul 9, 09:45 UTC9h 20m
2026-07-07 UAL160 - Jul 7, 10:35 UTCJul 7, 21:10 UTC10h 35m
2026-07-07 UAL160 MUC → IAH Jul 7, 10:39 UTCJul 7, 20:53 UTC10h 14m
2026-07-06 UAL194 SFO → MUC Jul 6, 21:28 UTCJul 7, 07:52 UTC10h 24m
2026-07-06 UAL194 - Jul 6, 21:30 UTCJul 7, 00:00 UTC2h 30m
2026-07-06 UAL876 HND → SFO Jul 6, 07:15 UTCJul 6, 16:03 UTC8h 48m
2026-07-06 UAL876 - Jul 6, 07:05 UTCJul 6, 07:45 UTC40m
2026-07-05 UAL131 EWR → HND Jul 5, 14:53 UTCJul 6, 03:43 UTC12h 50m
2026-07-05 UAL131 - Jul 5, 14:55 UTCJul 5, 16:00 UTC1h 5m
2026-07-04 UAL55 - Jul 4, 12:40 UTCJul 4, 20:00 UTC7h 20m
2026-07-04 UAL55 CDG → EWR Jul 4, 12:39 UTCJul 4, 20:20 UTC7h 41m
2026-07-04 UAL54 - Jul 4, 04:10 UTCJul 4, 10:35 UTC6h 25m
2026-07-03 UAL56 CDG → EWR Jul 3, 08:00 UTCJul 3, 15:55 UTC7h 55m

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 N798UA page for operator, model, and routing details .

Mode-S AAD780 frequently asked

What is Mode-S code AAD780?
AAD780 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N798UA.
Where is Mode-S AAD780 registered?
Mode-S code AAD780 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 AAD780 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAD780, octal 52553600, decimal 11,196,288.
What flights does AAD780 operate?
Mode-S AAD780 has broadcast 20 distinct callsigns, including UAL71, UAL885, UAL819, UAL18, UAL70.