Apparatus

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sensors Mode-S transponder

AAB001

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N788UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AAB001
Octal
52530001
Decimal
11,186,177
Country
US
Tail
N788UA
Type
B772
No current signal · last broadcast Jul 26, 10:45 UTC
Flights observed
252
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 10:45 UTC

Last known position

Most recent position reported by Mode-S AAB001.

Country allocation

The ICAO 24-bit address AAB001 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
UAL990 - 15 2026-06-29
UAL23 United Airlines 11 2026-07-20
UAL18 United Airlines 10 2026-07-21
UAL818 United Airlines 9 2026-05-04
UAL71 - 9 2026-07-19
UAL22 United Airlines 9 2026-07-20
UAL195 United Airlines 9 2026-06-13
UAL880 United Airlines 8 2026-06-20
UAL819 United Airlines 8 2026-07-26
UAL879 - 7 2026-06-20
UAL70 - 7 2026-07-19
UAL19 United Airlines 7 2026-07-20
UAL102 - 7 2026-06-12
UAL948 United Airlines 6 2026-04-27
UAL914 United Airlines 6 2026-06-30
UAL57 United Airlines 6 2026-06-17
UAL984 - 5 2026-06-18
UAL56 United Airlines 5 2026-06-17
UAL968 United Airlines 4 2026-06-08
UAL915 - 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL819 IAH → EZE Jul 26, 01:40 UTCJul 26, 10:45 UTC9h 6m
2026-07-25 UAL47 FRA → IAH Jul 25, 12:20 UTCJul 25, 22:25 UTC10h 5m
2026-07-24 UAL46 IAH → FRA Jul 24, 23:45 UTCJul 25, 08:45 UTC9h 0m
2026-07-23 UAL160 MUC → IAH Jul 23, 11:15 UTCJul 23, 12:15 UTC1h 0m
2026-07-23 UAL160 MUC → IAH Jul 23, 10:39 UTCJul 23, 21:47 UTC11h 8m
2026-07-22 UAL194 SFO → MUC Jul 22, 21:20 UTCJul 23, 07:25 UTC10h 5m
2026-07-22 UAL1593 LGA → DEN Jul 22, 13:50 UTCJul 22, 19:10 UTC5h 20m
2026-07-21 UAL2328 ORD → SFO Jul 21, 21:45 UTCJul 22, 03:44 UTC5h 59m
2026-07-21 UAL2328 ORD → SFO Jul 21, 22:25 UTCJul 22, 03:50 UTC5h 25m
2026-07-21 UAL18 MXP → EWR Jul 21, 10:20 UTCJul 21, 18:25 UTC8h 5m
2026-07-20 UAL19 EWR → MXP Jul 20, 22:15 UTCJul 21, 05:15 UTC6h 59m
2026-07-20 UAL22 DUB → EWR Jul 20, 09:10 UTCJul 20, 15:35 UTC6h 25m
2026-07-20 UAL22 DUB → EWR Jul 20, 09:10 UTCJul 20, 15:32 UTC6h 22m
2026-07-20 UAL23 EWR → DUB Jul 20, 00:32 UTCJul 20, 06:43 UTC6h 11m
2026-07-20 UAL23 EWR → DUB Jul 20, 01:05 UTCJul 20, 02:15 UTC1h 10m
2026-07-19 UAL71 AMS → EWR Jul 19, 11:00 UTCJul 19, 19:10 UTC8h 10m
2026-07-19 UAL71 AMS → EWR Jul 19, 10:47 UTCJul 19, 19:08 UTC8h 21m
2026-07-19 UAL70 EWR → AMS Jul 19, 01:55 UTCJul 19, 08:45 UTC6h 50m
2026-07-18 UAL905 - Jul 18, 16:45 UTCJul 18, 17:00 UTC15m
2026-07-18 UAL905 LHR → EWR Jul 18, 09:25 UTCJul 18, 17:00 UTC7h 35m
2026-07-18 UAL905 LHR → EWR Jul 18, 08:55 UTCJul 18, 16:28 UTC7h 33m
2026-07-18 UAL14 EWR → LHR Jul 18, 00:00 UTCJul 18, 06:40 UTC6h 41m
2026-07-17 UAL22 DUB → EWR Jul 17, 10:40 UTCJul 17, 17:20 UTC6h 40m
2026-07-17 UAL23 EWR → DUB Jul 17, 00:15 UTCJul 17, 06:27 UTC6h 12m
2026-07-17 UAL23 EWR → DUB Jul 17, 00:45 UTCJul 17, 06:35 UTC5h 50m
2026-07-16 UAL22 DUB → EWR Jul 16, 08:40 UTCJul 16, 15:05 UTC6h 25m
2026-07-16 UAL23 - Jul 16, 00:15 UTCJul 16, 06:10 UTC5h 55m
2026-07-15 UAL1141 SFO → EWR Jul 15, 06:20 UTCJul 15, 11:05 UTC4h 45m
2026-07-14 UAL852 TPE → SFO Jul 14, 06:51 UTCJul 14, 18:28 UTC11h 37m
2026-07-14 UAL852 - Jul 14, 06:45 UTCJul 14, 18:30 UTC11h 45m
2026-07-14 UAL852 TPE → SFO Jul 14, 06:51 UTCJul 14, 18:17 UTC11h 26m
2026-07-13 UAL853 SFO → TPE Jul 13, 07:55 UTCJul 13, 20:00 UTC12h 5m
2026-07-12 UAL506 - Jul 12, 14:40 UTCJul 13, 03:01 UTC12h 20m
2026-07-12 UAL507 - Jul 12, 00:25 UTCJul 12, 11:40 UTC11h 15m
2026-07-10 UAL2328 EWR → SFO Jul 10, 19:45 UTCJul 11, 01:25 UTC5h 40m
2026-07-10 UAL22 DUB → EWR Jul 10, 08:35 UTCJul 10, 15:20 UTC6h 45m
2026-07-10 UAL23 EWR → DUB Jul 10, 00:55 UTCJul 10, 06:05 UTC5h 10m
2026-07-10 UAL23 - Jul 10, 00:40 UTCJul 10, 06:15 UTC5h 35m
2026-07-09 UAL71 - Jul 9, 07:35 UTCJul 9, 14:15 UTC6h 40m
2026-07-09 UAL71 AMS → EWR Jul 9, 07:27 UTCJul 9, 15:00 UTC7h 33m
2026-07-08 UAL70 EWR → AMS Jul 8, 22:28 UTCJul 9, 04:56 UTC6h 28m
2026-07-08 UAL70 - Jul 8, 22:35 UTCJul 9, 04:15 UTC5h 40m
2026-07-06 UAL31 - Jul 6, 08:05 UTCJul 6, 16:30 UTC8h 25m
2026-07-05 UAL30 - Jul 5, 22:20 UTCJul 6, 05:05 UTC6h 45m
2026-07-05 UAL1141 SFO → EWR Jul 5, 05:50 UTCJul 5, 10:30 UTC4h 40m
2026-07-04 UAL1336 - Jul 4, 15:40 UTCJul 4, 20:55 UTC5h 15m
2026-07-04 UAL148 - Jul 4, 01:40 UTCJul 4, 10:25 UTC8h 45m
2026-07-04 UAL148 GRU → EWR Jul 4, 01:28 UTCJul 4, 10:23 UTC8h 55m
2026-07-03 UAL149 - Jul 3, 01:15 UTCJul 3, 10:00 UTC8h 45m
2026-07-03 UAL149 EWR → GRU Jul 3, 01:05 UTCJul 3, 09:53 UTC8h 48m

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 N788UA page for operator, model, and routing details .

Mode-S AAB001 frequently asked

What is Mode-S code AAB001?
AAB001 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N788UA.
Where is Mode-S AAB001 registered?
Mode-S code AAB001 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 AAB001 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 10:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAB001, octal 52530001, decimal 11,186,177.
What flights does AAB001 operate?
Mode-S AAB001 has broadcast 20 distinct callsigns, including UAL990, UAL23, UAL18, UAL818, UAL71.