Apparatus

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sensors Mode-S transponder

AA75EF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N773UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA75EF
Octal
52472757
Decimal
11,171,311
Country
US
Tail
N773UA
Type
B772
Broadcasting now · callsign UAL418 · 39,000 ft
Flights observed
211
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Current position

AA75EF is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA75EF 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
UAL1158 - 14 2026-07-09
UAL300 United Airlines 11 2026-07-26
UAL384 United Airlines 9 2026-07-02
UAL1170 - 9 2026-07-11
UAL1157 - 9 2026-07-09
UAL2358 United Airlines 8 2026-07-22
UAL1818 - 8 2026-07-11
UAL1169 - 8 2026-07-09
UAL604 United Airlines 7 2026-07-22
UAL383 - 7 2026-06-29
UAL1806 United Airlines 7 2026-06-08
UAL1805 United Airlines 7 2026-06-08
UAL253 - 6 2026-07-08
UAL2480 United Airlines 6 2026-07-25
UAL373 United Airlines 5 2026-04-16
UAL2610 United Airlines 5 2026-07-26
UAL1736 - 5 2026-06-29
UAL1731 United Airlines 5 2026-04-29
UAL252 - 4 2026-07-08
UAL2280 United Airlines 4 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL300 SFO → HNL Jul 26, 21:15 UTCJul 26, 21:45 UTC30m
2026-07-26 UAL2610 IAD → PDX Jul 26, 15:00 UTCJul 26, 18:40 UTC3h 40m
2026-07-25 UAL2480 BOS → SFO Jul 25, 23:15 UTCJul 26, 02:45 UTC3h 30m
2026-07-23 UAL1147 BOS → EWR Jul 23, 12:55 UTCJul 23, 17:43 UTC4h 48m
2026-07-23 UAL1147 IAD → SFO Jul 23, 12:55 UTCJul 23, 17:55 UTC5h 0m
2026-07-22 UAL1791 LAS → ORD Jul 22, 20:50 UTCJul 23, 01:20 UTC4h 30m
2026-07-22 UAL2358 SAN → EWR Jul 22, 15:40 UTCJul 22, 19:10 UTC3h 30m
2026-07-22 UAL2358 SAN → EWR Jul 22, 15:40 UTCJul 22, 18:55 UTC3h 15m
2026-07-22 UAL604 DEN → SYR Jul 22, 10:20 UTCJul 22, 11:45 UTC1h 25m
2026-07-21 UAL2358 SAN → EWR Jul 21, 16:00 UTCJul 21, 19:05 UTC3h 5m
2026-07-21 UAL604 DEN → SYR Jul 21, 08:50 UTCJul 21, 12:15 UTC3h 25m
2026-07-20 UAL1844 EWR → MIA Jul 20, 23:30 UTCJul 21, 04:40 UTC5h 9m
2026-07-20 UAL3011 SFO → EWR Jul 20, 15:55 UTCJul 20, 20:35 UTC4h 40m
2026-07-17 UAL2610 - Jul 17, 14:50 UTCJul 17, 18:19 UTC3h 30m
2026-07-16 UAL2480 SFO → ORD Jul 16, 22:45 UTCJul 17, 02:15 UTC3h 30m
2026-07-16 UAL1147 - Jul 16, 12:55 UTCJul 16, 17:40 UTC4h 45m
2026-07-16 UAL1147 IAD → SFO Jul 16, 12:55 UTCJul 16, 17:29 UTC4h 34m
2026-07-15 UAL8191 SFO → IAD Jul 15, 21:02 UTCJul 16, 01:35 UTC4h 33m
2026-07-15 UAL8191 SFO → IAD Jul 15, 21:00 UTCJul 16, 01:35 UTC4h 35m
2026-07-15 UAL2610 - Jul 15, 14:55 UTCJul 15, 18:30 UTC3h 35m
2026-07-15 UAL2610 ORD → SFO Jul 15, 14:21 UTCJul 15, 18:14 UTC3h 53m
2026-07-14 UAL2480 SFO → ORD Jul 14, 23:00 UTCJul 15, 02:40 UTC3h 40m
2026-07-11 UAL1818 - Jul 11, 23:50 UTCJul 12, 04:20 UTC4h 30m
2026-07-11 UAL1170 - Jul 11, 00:15 UTCJul 11, 05:20 UTC5h 5m
2026-07-09 UAL1157 - Jul 9, 23:50 UTCJul 10, 04:40 UTC4h 50m
2026-07-09 UAL1158 - Jul 9, 16:25 UTCJul 9, 21:40 UTC5h 15m
2026-07-09 UAL1158 LAX → HNL Jul 9, 16:21 UTCJul 9, 21:35 UTC5h 14m
2026-07-09 UAL1169 - Jul 9, 08:15 UTCJul 9, 12:55 UTC4h 40m
2026-07-08 UAL253 - Jul 8, 15:35 UTCJul 8, 23:20 UTC7h 45m
2026-07-08 UAL252 - Jul 8, 06:20 UTCJul 8, 13:20 UTC7h 0m
2026-07-07 UAL253 - Jul 7, 15:45 UTCJul 7, 23:25 UTC7h 40m
2026-07-07 UAL252 - Jul 7, 06:15 UTCJul 7, 13:10 UTC6h 55m
2026-07-07 UAL300 - Jul 7, 01:50 UTCJul 7, 02:15 UTC25m
2026-07-06 UAL300 - Jul 6, 21:35 UTCJul 6, 22:00 UTC25m
2026-07-06 UAL300 SFO → HNL Jul 6, 21:31 UTCJul 7, 02:14 UTC4h 43m
2026-07-06 UAL2358 SAN → EWR Jul 6, 15:15 UTCJul 6, 18:40 UTC3h 25m
2026-07-06 UAL604 DEN → SYR Jul 6, 08:20 UTCJul 6, 11:25 UTC3h 5m
2026-07-06 UAL1818 - Jul 6, 03:25 UTCJul 6, 04:00 UTC35m
2026-07-05 UAL1818 - Jul 5, 23:35 UTCJul 5, 23:45 UTC10m
2026-07-05 UAL1818 HNL → SFO Jul 5, 23:45 UTCJul 6, 03:55 UTC4h 10m
2026-07-05 UAL1158 - Jul 5, 21:05 UTCJul 5, 21:20 UTC15m
2026-07-05 UAL1158 - Jul 5, 16:15 UTCJul 5, 16:40 UTC25m
2026-07-05 UAL1158 LAX → HNL Jul 5, 16:21 UTCJul 5, 21:19 UTC4h 58m
2026-07-05 UAL1169 - Jul 5, 07:55 UTCJul 5, 12:35 UTC4h 40m
2026-07-05 UAL1170 - Jul 5, 00:20 UTCJul 5, 05:45 UTC5h 25m
2026-07-03 UAL1157 BOS → IAD Jul 3, 23:20 UTCJul 4, 03:50 UTC4h 30m
2026-07-02 UAL253 - Jul 2, 23:20 UTCJul 2, 23:35 UTC15m
2026-07-02 UAL253 - Jul 2, 15:50 UTCJul 2, 19:15 UTC3h 25m
2026-07-02 UAL252 - Jul 2, 06:15 UTCJul 2, 13:10 UTC6h 55m
2026-07-02 UAL384 DEN → HNL Jul 2, 01:05 UTCJul 2, 01:15 UTC10m

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 N773UA page for operator, model, and routing details .

Mode-S AA75EF frequently asked

What is Mode-S code AA75EF?
AA75EF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N773UA.
Where is Mode-S AA75EF registered?
Mode-S code AA75EF 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 AA75EF broadcasting right now?
Yes. Mode-S AA75EF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA75EF, octal 52472757, decimal 11,171,311.
What flights does AA75EF operate?
Mode-S AA75EF has broadcast 20 distinct callsigns, including UAL1158, UAL300, UAL384, UAL1170, UAL1157.