Apparatus

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sensors Mode-S transponder

AA56F8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76533 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA56F8
Octal
52453370
Decimal
11,163,384
Country
US
Tail
N76533
Type
B738
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
450
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S AA56F8.

Country allocation

The ICAO 24-bit address AA56F8 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
UAL2725 United Airlines 5 2026-06-21
UAL1877 - 5 2026-06-30
UAL520 United Airlines 4 2026-06-08
UAL2724 United Airlines 4 2026-06-20
UAL244 United Airlines 4 2026-06-26
UAL2337 - 4 2026-07-19
UAL1311 United Airlines 4 2026-04-24
UAL586 - 3 2026-07-13
UAL514 - 3 2026-06-16
UAL476 - 3 2026-06-21
UAL354 - 3 2026-07-07
UAL329 - 3 2026-06-30
UAL2752 United Airlines 3 2026-07-26
UAL2605 - 3 2026-07-23
UAL2493 - 3 2026-07-03
UAL2351 United Airlines 3 2026-05-30
UAL2336 - 3 2026-07-04
UAL2167 United Airlines 3 2026-06-15
UAL213 - 3 2026-07-17
UAL2047 - 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1180 DEN → CID Jul 26, 14:05 UTCJul 26, 21:50 UTC7h 45m
2026-07-26 UAL2752 LAX → SFO Jul 26, 11:20 UTCJul 26, 12:10 UTC50m
2026-07-26 UAL2148 EWR → SAT Jul 26, 03:20 UTCJul 26, 04:00 UTC40m
2026-07-25 UAL1352 IAH → CMH Jul 25, 21:15 UTCJul 26, 00:50 UTC3h 35m
2026-07-25 UAL1320 SFO → ONT Jul 25, 17:50 UTCJul 25, 19:45 UTC1h 55m
2026-07-25 UAL2459 DEN → YYC Jul 25, 14:57 UTCJul 25, 16:30 UTC1h 33m
2026-07-25 UAL2459 DEN → YYC Jul 25, 14:45 UTCJul 25, 16:35 UTC1h 50m
2026-07-25 UAL214 HNL → SFO Jul 25, 03:55 UTCJul 25, 05:30 UTC1h 35m
2026-07-25 UAL467 BOS → DEN Jul 25, 00:45 UTCJul 25, 02:15 UTC1h 30m
2026-07-24 UAL2150 HNL → DEN Jul 24, 21:15 UTCJul 24, 23:30 UTC2h 15m
2026-07-24 UAL382 IAH → SAT Jul 24, 17:15 UTCJul 24, 19:50 UTC2h 35m
2026-07-24 UAL2047 - Jul 24, 13:00 UTCJul 24, 15:35 UTC2h 35m
2026-07-24 UAL631 IAH → BWI Jul 24, 07:40 UTCJul 24, 11:30 UTC3h 50m
2026-07-24 UAL1359 IAH → EWR Jul 24, 02:05 UTCJul 24, 06:20 UTC4h 15m
2026-07-23 UAL1570 RNO → SFO Jul 23, 21:10 UTCJul 23, 23:20 UTC2h 10m
2026-07-23 UAL1569 IAH → BZE Jul 23, 17:35 UTCJul 23, 19:15 UTC1h 40m
2026-07-23 UAL1569 IAH → BZE Jul 23, 17:36 UTCJul 23, 19:35 UTC1h 59m
2026-07-23 UAL1957 PHL → IAH Jul 23, 11:50 UTCJul 23, 15:10 UTC3h 20m
2026-07-23 UAL2605 ORD → LGA Jul 23, 00:25 UTCJul 23, 01:50 UTC1h 25m
2026-07-22 UAL1156 IAD → EWR Jul 22, 20:45 UTCJul 22, 22:40 UTC1h 55m
2026-07-22 UAL2267 EWR → RDU Jul 22, 17:15 UTCJul 22, 18:45 UTC1h 30m
2026-07-22 UAL1057 DEN → SFO Jul 22, 13:35 UTCJul 22, 15:31 UTC1h 56m
2026-07-22 UAL1057 DEN → SFO Jul 22, 13:50 UTCJul 22, 15:50 UTC2h 0m
2026-07-22 UAL1623 EWR → AUS Jul 22, 00:20 UTCJul 22, 02:10 UTC1h 50m
2026-07-21 UAL2635 IAH → LGA Jul 21, 19:10 UTCJul 21, 21:30 UTC2h 20m
2026-07-21 UAL709 EWR → FLL Jul 21, 15:05 UTCJul 21, 17:05 UTC2h 0m
2026-07-21 UAL2752 - Jul 21, 11:15 UTCJul 21, 12:10 UTC55m
2026-07-21 UAL2752 CVG → ORD Jul 21, 11:15 UTCJul 21, 11:57 UTC42m
2026-07-21 UAL2148 EWR → SAT Jul 21, 03:10 UTCJul 21, 03:50 UTC40m
2026-07-20 UAL791 BZN → ORD Jul 20, 22:40 UTCJul 21, 00:20 UTC1h 40m
2026-07-20 UAL2124 PDX → SFO Jul 20, 20:00 UTCJul 20, 21:25 UTC1h 25m
2026-07-20 UAL1239 EWR → RDU Jul 20, 15:50 UTCJul 20, 17:25 UTC1h 35m
2026-07-20 UAL425 MCO → EWR Jul 20, 12:45 UTCJul 20, 13:59 UTC1h 14m
2026-07-20 UAL425 MCO → EWR Jul 20, 12:35 UTCJul 20, 14:00 UTC1h 25m
2026-07-20 UAL1830 LGA → ORD Jul 20, 04:10 UTCJul 20, 06:00 UTC1h 50m
2026-07-20 UAL1830 LGA → ORD Jul 20, 03:41 UTCJul 20, 05:47 UTC2h 6m
2026-07-20 UAL2605 ORD → LGA Jul 20, 00:07 UTCJul 20, 01:43 UTC1h 36m
2026-07-20 UAL2605 ORD → LGA Jul 20, 00:00 UTCJul 20, 01:45 UTC1h 45m
2026-07-19 UAL1325 DCA → ORD Jul 19, 20:25 UTCJul 19, 22:00 UTC1h 35m
2026-07-19 UAL2668 OMA → ORD Jul 19, 17:25 UTCJul 19, 18:50 UTC1h 25m
2026-07-19 UAL2668 OMA → ORD Jul 19, 17:29 UTCJul 19, 18:44 UTC1h 15m
2026-07-19 UAL202 PWM → ORD Jul 19, 13:35 UTCJul 19, 15:45 UTC2h 10m
2026-07-19 UAL2337 IAD → AUS Jul 19, 04:09 UTCJul 19, 06:39 UTC2h 30m
2026-07-19 UAL2337 IAD → AUS Jul 19, 03:50 UTCJul 19, 06:40 UTC2h 50m
2026-07-19 UAL1140 BNA → IAD Jul 19, 00:20 UTCJul 19, 01:45 UTC1h 25m
2026-07-18 UAL1140 LAS → BNA Jul 18, 16:05 UTCJul 18, 20:20 UTC4h 15m
2026-07-18 UAL582 - Jul 18, 13:25 UTCJul 18, 14:30 UTC1h 5m
2026-07-18 UAL2126 ANC → SFO Jul 18, 08:10 UTCJul 18, 12:20 UTC4h 10m
2026-07-18 UAL1594 - Jul 18, 02:05 UTCJul 18, 06:15 UTC4h 11m
2026-07-17 UAL298 AUS → EWR Jul 17, 20:10 UTCJul 18, 00:29 UTC4h 20m

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 N76533 page for operator, model, and routing details .

Mode-S AA56F8 frequently asked

What is Mode-S code AA56F8?
AA56F8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76533.
Where is Mode-S AA56F8 registered?
Mode-S code AA56F8 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 AA56F8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA56F8, octal 52453370, decimal 11,163,384.
What flights does AA56F8 operate?
Mode-S AA56F8 has broadcast 20 distinct callsigns, including UAL2725, UAL1877, UAL520, UAL2724, UAL244.