Apparatus

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sensors Mode-S transponder

AA568F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76503 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA568F
Octal
52453217
Decimal
11,163,279
Country
US
Tail
N76503
Type
B738
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
466
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AA568F.

Country allocation

The ICAO 24-bit address AA568F 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
UAL2655 United Airlines 5 2026-05-28
UAL2270 - 5 2026-07-07
UAL1046 United Airlines 5 2026-05-19
UAL766 United Airlines 4 2026-05-30
UAL2442 - 4 2026-07-09
UAL2069 - 4 2026-07-09
UAL1896 United Airlines 4 2026-07-21
UAL1867 - 4 2026-06-27
UAL8259 United Airlines 3 2026-04-17
UAL637 United Airlines 3 2026-05-02
UAL547 United Airlines 3 2026-06-07
UAL361 United Airlines 3 2026-05-26
UAL2865 United Airlines 3 2026-06-10
UAL286 United Airlines 3 2026-04-28
UAL2853 United Airlines 3 2026-05-26
UAL2780 United Airlines 3 2026-05-25
UAL251 - 3 2026-07-08
UAL244 United Airlines 3 2026-06-06
UAL214 - 3 2026-07-18
UAL1909 United Airlines 3 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL433 BOS → SFO Jul 26, 20:50 UTCJul 26, 21:45 UTC55m
2026-07-26 UAL1554 SJC → DEN Jul 26, 17:43 UTCJul 26, 19:10 UTC1h 27m
2026-07-26 UAL343 DCA → ORD Jul 26, 15:00 UTCJul 26, 16:25 UTC1h 25m
2026-07-26 UAL2175 SLC → DEN Jul 26, 12:25 UTCJul 26, 13:20 UTC55m
2026-07-26 UAL1738 MCO → EWR Jul 26, 03:45 UTCJul 26, 05:15 UTC1h 30m
2026-07-25 UAL309 ATL → EWR Jul 25, 22:10 UTCJul 26, 00:30 UTC2h 20m
2026-07-25 UAL220 IAD → GCM Jul 25, 16:50 UTCJul 25, 19:05 UTC2h 15m
2026-07-25 UAL220 IAD → GCM Jul 25, 16:56 UTCJul 25, 19:49 UTC2h 53m
2026-07-25 UAL2098 BOS → IAD Jul 25, 13:40 UTCJul 25, 14:50 UTC1h 10m
2026-07-24 UAL2798 MIA → ORD Jul 24, 23:25 UTCJul 25, 02:45 UTC3h 20m
2026-07-24 UAL2745 HNL → SFO Jul 24, 19:50 UTCJul 24, 22:10 UTC2h 20m
2026-07-24 UAL2745 HNL → SFO Jul 24, 19:50 UTCJul 24, 22:07 UTC2h 17m
2026-07-24 UAL2637 DEN → CHS Jul 24, 16:20 UTCJul 24, 18:25 UTC2h 5m
2026-07-24 UAL1767 DEN → DCA Jul 24, 13:30 UTCJul 24, 14:05 UTC35m
2026-07-24 UAL2781 HNL → EWR Jul 24, 04:00 UTCJul 24, 04:30 UTC30m
2026-07-23 UAL1236 EWR → PHX Jul 23, 23:15 UTCJul 24, 01:30 UTC2h 15m
2026-07-23 UAL1767 DEN → DCA Jul 23, 19:15 UTCJul 23, 21:45 UTC2h 30m
2026-07-23 UAL489 DEN → IAH Jul 23, 15:55 UTCJul 23, 17:45 UTC1h 50m
2026-07-23 UAL489 DEN → IAH Jul 23, 15:58 UTCJul 23, 17:44 UTC1h 46m
2026-07-23 UAL589 DEN → RIC Jul 23, 02:45 UTCJul 23, 03:50 UTC1h 5m
2026-07-22 UAL1931 SJD → SFO Jul 22, 21:45 UTCJul 22, 23:10 UTC1h 25m
2026-07-22 UAL1189 - Jul 22, 16:10 UTCJul 22, 17:30 UTC1h 20m
2026-07-22 UAL1189 SFO → SJD Jul 22, 16:08 UTCJul 22, 18:51 UTC2h 43m
2026-07-21 UAL1212 SFO → PVR Jul 21, 16:05 UTCJul 21, 23:45 UTC7h 40m
2026-07-21 UAL1896 SEA → SFO Jul 21, 12:30 UTCJul 21, 13:55 UTC1h 25m
2026-07-20 UAL2817 - Jul 20, 19:25 UTCJul 20, 23:25 UTC4h 0m
2026-07-20 UAL2817 ORD → PDX Jul 20, 18:59 UTCJul 20, 23:23 UTC4h 24m
2026-07-20 UAL1693 - Jul 20, 02:30 UTCJul 20, 17:05 UTC14h 35m
2026-07-19 UAL403 - Jul 19, 22:00 UTCJul 20, 00:50 UTC2h 50m
2026-07-19 UAL279 - Jul 19, 17:30 UTCJul 19, 20:05 UTC2h 35m
2026-07-19 UAL1057 DEN → SFO Jul 19, 14:00 UTCJul 19, 15:55 UTC1h 55m
2026-07-19 UAL2033 RNO → SFO Jul 19, 00:15 UTCJul 19, 03:40 UTC3h 25m
2026-07-18 UAL2155 - Jul 18, 21:00 UTCJul 18, 22:00 UTC1h 0m
2026-07-18 UAL2383 PHL → DEN Jul 18, 18:30 UTCJul 18, 19:20 UTC50m
2026-07-18 UAL2459 STL → DEN Jul 18, 14:20 UTCJul 18, 16:05 UTC1h 45m
2026-07-18 UAL214 DEN → STL Jul 18, 03:10 UTCJul 18, 04:50 UTC1h 40m
2026-07-18 UAL214 DEN → STL Jul 18, 03:05 UTCJul 18, 04:51 UTC1h 46m
2026-07-17 UAL1236 YVR → DEN Jul 17, 22:49 UTCJul 18, 01:15 UTC2h 25m
2026-07-17 UAL1767 DEN → YVR Jul 17, 19:00 UTCJul 17, 21:20 UTC2h 20m
2026-07-17 UAL3915 - Jul 17, 14:50 UTCJul 17, 16:59 UTC2h 10m
2026-07-17 UAL3915 SAT → DEN Jul 17, 14:42 UTCJul 17, 16:56 UTC2h 14m
2026-07-15 UAL2844 - Jul 15, 19:05 UTCJul 15, 21:30 UTC2h 25m
2026-07-15 UAL1502 SLC → ORD Jul 15, 14:10 UTCJul 15, 17:05 UTC2h 55m
2026-07-15 UAL1710 ORD → SLC Jul 15, 02:25 UTCJul 15, 05:10 UTC2h 45m
2026-07-14 UAL1156 LGA → ORD Jul 14, 20:40 UTCJul 14, 22:40 UTC2h 0m
2026-07-14 UAL2267 - Jul 14, 17:55 UTCJul 14, 19:40 UTC1h 45m
2026-07-14 UAL343 - Jul 14, 15:05 UTCJul 14, 16:15 UTC1h 10m
2026-07-14 UAL2175 ORD → BNA Jul 14, 12:40 UTCJul 14, 13:45 UTC1h 5m
2026-07-14 UAL1621 MCO → ORD Jul 14, 02:40 UTCJul 14, 04:55 UTC2h 15m
2026-07-13 UAL1101 IAD → MCO Jul 13, 23:05 UTCJul 14, 00:50 UTC1h 45m

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 N76503 page for operator, model, and routing details .

Mode-S AA568F frequently asked

What is Mode-S code AA568F?
AA568F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76503.
Where is Mode-S AA568F registered?
Mode-S code AA568F 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 AA568F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA568F, octal 52453217, decimal 11,163,279.
What flights does AA568F operate?
Mode-S AA568F has broadcast 20 distinct callsigns, including UAL2655, UAL2270, UAL1046, UAL766, UAL2442.