Apparatus

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sensors Mode-S transponder

AA9600

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N781UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA9600
Octal
52513000
Decimal
11,179,520
Country
US
Tail
N781UA
Type
B772
No current signal · last broadcast Jul 26, 18:15 UTC
Flights observed
296
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:15 UTC

Last known position

Most recent position reported by Mode-S AA9600.

Country allocation

The ICAO 24-bit address AA9600 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
UAL253 - 32 2026-07-15
UAL300 - 25 2026-07-08
UAL1158 - 22 2026-07-13
UAL252 - 19 2026-07-15
UAL1170 - 13 2026-07-13
UAL1157 - 13 2026-07-11
UAL1169 - 12 2026-07-13
UAL604 - 11 2026-07-14
UAL1818 - 11 2026-07-17
UAL2358 - 10 2026-07-08
UAL1147 United Airlines 9 2026-07-26
UAL2280 United Airlines 8 2026-06-22
UAL2475 - 7 2026-06-22
UAL1902 - 7 2026-06-24
UAL1947 United Airlines 6 2026-05-21
UAL1806 United Airlines 6 2026-05-18
UAL1791 United Airlines 6 2026-07-25
UAL1758 United Airlines 6 2026-04-16
UAL1731 United Airlines 6 2026-04-16
UAL373 United Airlines 5 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1147 BOS → EWR Jul 26, 13:00 UTCJul 26, 17:55 UTC4h 55m
2026-07-25 UAL1791 LAS → ORD Jul 25, 21:10 UTCJul 26, 01:35 UTC4h 25m
2026-07-25 UAL1791 LAS → ORD Jul 25, 20:45 UTCJul 25, 20:50 UTC5m
2026-07-25 UAL2610 IAD → PDX Jul 25, 14:45 UTCJul 25, 18:35 UTC3h 50m
2026-07-24 UAL2480 BOS → SFO Jul 24, 22:40 UTCJul 25, 02:00 UTC3h 20m
2026-07-24 UAL1147 BOS → EWR Jul 24, 18:10 UTCJul 24, 18:15 UTC5m
2026-07-24 UAL1147 BOS → EWR Jul 24, 13:00 UTCJul 24, 18:00 UTC5h 0m
2026-07-24 UAL1147 BOS → EWR Jul 24, 12:55 UTCJul 24, 17:53 UTC4h 58m
2026-07-23 UAL1791 LAS → ORD Jul 23, 20:40 UTCJul 24, 01:00 UTC4h 20m
2026-07-22 UAL2610 IAD → PDX Jul 22, 15:05 UTCJul 22, 19:15 UTC4h 10m
2026-07-21 UAL2480 BOS → SFO Jul 21, 22:55 UTCJul 22, 02:20 UTC3h 25m
2026-07-21 UAL1147 - Jul 21, 14:30 UTCJul 21, 19:15 UTC4h 45m
2026-07-20 UAL8109 ATL → YYZ Jul 20, 21:10 UTCJul 21, 01:50 UTC4h 39m
2026-07-20 UAL2610 IAD → PDX Jul 20, 14:30 UTCJul 20, 18:05 UTC3h 35m
2026-07-19 UAL2480 BOS → SFO Jul 19, 22:40 UTCJul 20, 02:05 UTC3h 25m
2026-07-19 UAL1147 IAD → SFO Jul 19, 13:00 UTCJul 19, 17:40 UTC4h 40m
2026-07-18 UAL1791 LAS → ORD Jul 18, 20:55 UTCJul 19, 01:15 UTC4h 20m
2026-07-18 UAL2610 - Jul 18, 14:25 UTCJul 18, 18:00 UTC3h 35m
2026-07-17 UAL2480 SFO → ORD Jul 17, 23:39 UTCJul 18, 03:10 UTC3h 31m
2026-07-17 UAL1818 - Jul 17, 03:20 UTCJul 17, 04:20 UTC1h 0m
2026-07-16 UAL1818 - Jul 16, 23:49 UTCJul 17, 00:04 UTC15m
2026-07-15 UAL253 - Jul 15, 23:30 UTCJul 15, 23:55 UTC25m
2026-07-15 UAL253 - Jul 15, 16:05 UTCJul 15, 19:15 UTC3h 10m
2026-07-15 UAL252 - Jul 15, 06:10 UTCJul 15, 13:20 UTC7h 10m
2026-07-14 UAL253 - Jul 14, 16:10 UTCJul 15, 00:00 UTC7h 49m
2026-07-14 UAL253 IAH → HNL Jul 14, 16:07 UTCJul 15, 00:00 UTC7h 53m
2026-07-14 UAL604 - Jul 14, 08:10 UTCJul 14, 11:25 UTC3h 15m
2026-07-14 UAL1818 - Jul 14, 00:35 UTCJul 14, 05:25 UTC4h 50m
2026-07-14 UAL1818 HNL → SFO Jul 14, 00:35 UTCJul 14, 05:14 UTC4h 39m
2026-07-13 UAL1158 - Jul 13, 16:30 UTCJul 13, 21:30 UTC5h 0m
2026-07-13 UAL1158 LAX → HNL Jul 13, 16:21 UTCJul 13, 21:29 UTC5h 8m
2026-07-13 UAL1169 - Jul 13, 07:55 UTCJul 13, 12:40 UTC4h 45m
2026-07-13 UAL1170 - Jul 13, 00:20 UTCJul 13, 05:20 UTC5h 0m
2026-07-11 UAL1157 - Jul 11, 23:55 UTCJul 12, 04:40 UTC4h 45m
2026-07-11 UAL1158 - Jul 11, 16:45 UTCJul 11, 17:15 UTC30m
2026-07-11 UAL1158 LAX → HNL Jul 11, 16:21 UTCJul 11, 21:43 UTC5h 22m
2026-07-10 UAL1157 - Jul 10, 23:20 UTCJul 11, 04:15 UTC4h 55m
2026-07-09 UAL253 - Jul 9, 17:55 UTCJul 10, 01:30 UTC7h 35m
2026-07-09 UAL252 - Jul 9, 08:40 UTCJul 9, 15:45 UTC7h 5m
2026-07-08 UAL300 - Jul 8, 21:50 UTCJul 9, 02:30 UTC4h 40m
2026-07-08 UAL2358 - Jul 8, 16:15 UTCJul 8, 19:25 UTC3h 10m
2026-07-08 UAL604 DEN → SYR Jul 8, 08:00 UTCJul 8, 11:15 UTC3h 15m
2026-07-07 UAL1818 - Jul 7, 23:40 UTCJul 8, 04:10 UTC4h 30m
2026-07-07 UAL1158 - Jul 7, 21:10 UTCJul 7, 21:35 UTC25m
2026-07-07 UAL1158 - Jul 7, 16:25 UTCJul 7, 16:55 UTC30m
2026-07-07 UAL1169 - Jul 7, 08:00 UTCJul 7, 12:30 UTC4h 30m
2026-07-07 UAL1170 - Jul 7, 00:25 UTCJul 7, 05:20 UTC4h 55m
2026-07-05 UAL1157 BOS → IAD Jul 5, 23:20 UTCJul 6, 04:00 UTC4h 40m
2026-07-04 UAL253 - Jul 4, 15:35 UTCJul 4, 19:10 UTC3h 35m
2026-07-04 UAL253 IAH → HNL Jul 4, 15:32 UTCJul 4, 23:22 UTC7h 50m

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 N781UA page for operator, model, and routing details .

Mode-S AA9600 frequently asked

What is Mode-S code AA9600?
AA9600 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N781UA.
Where is Mode-S AA9600 registered?
Mode-S code AA9600 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 AA9600 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA9600, octal 52513000, decimal 11,179,520.
What flights does AA9600 operate?
Mode-S AA9600 has broadcast 20 distinct callsigns, including UAL253, UAL300, UAL1158, UAL252, UAL1170.