Apparatus

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sensors Mode-S transponder

AA7E56

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77525 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA7E56
Octal
52477126
Decimal
11,173,462
Country
US
Tail
N77525
Type
B738
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
475
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S AA7E56.

Country allocation

The ICAO 24-bit address AA7E56 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
UAL2048 - 9 2026-07-05
UAL245 - 8 2026-07-05
UAL1794 - 7 2026-06-24
UAL678 - 6 2026-06-24
UAL565 - 5 2026-06-17
UAL2299 United Airlines 5 2026-06-09
UAL2205 - 5 2026-06-20
UAL448 United Airlines 4 2026-07-22
UAL2263 - 4 2026-06-29
UAL2189 United Airlines 4 2026-06-11
UAL211 United Airlines 4 2026-04-13
UAL2086 United Airlines 4 2026-06-20
UAL1910 - 4 2026-07-10
UAL1821 - 4 2026-07-04
UAL1712 - 4 2026-07-09
UAL1622 - 4 2026-06-29
UAL1371 - 4 2026-07-12
UAL1311 - 4 2026-07-10
UAL722 United Airlines 3 2026-06-15
UAL551 - 3 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2150 HNL → DEN Jul 26, 19:40 UTCJul 26, 21:30 UTC1h 50m
2026-07-26 UAL2617 SFO → LAX Jul 26, 14:20 UTCJul 26, 17:25 UTC3h 5m
2026-07-25 UAL2249 PHX → SFO Jul 25, 19:35 UTCJul 25, 22:45 UTC3h 10m
2026-07-25 UAL2617 SFO → LAX Jul 25, 14:38 UTCJul 25, 17:55 UTC3h 17m
2026-07-25 UAL2617 SFO → LAX Jul 25, 14:55 UTCJul 25, 17:55 UTC3h 0m
2026-07-25 UAL2605 SJC → DEN Jul 25, 00:05 UTCJul 25, 01:40 UTC1h 35m
2026-07-24 UAL1504 ORD → DCA Jul 24, 20:20 UTCJul 24, 22:15 UTC1h 55m
2026-07-24 UAL1775 SFO → PHX Jul 24, 17:10 UTCJul 24, 18:45 UTC1h 35m
2026-07-24 UAL1057 DEN → SFO Jul 24, 13:35 UTCJul 24, 15:12 UTC1h 37m
2026-07-24 UAL1057 DEN → SFO Jul 24, 13:30 UTCJul 24, 15:35 UTC2h 5m
2026-07-23 UAL1623 EWR → AUS Jul 23, 23:45 UTCJul 24, 01:30 UTC1h 45m
2026-07-23 UAL1325 DEN → PDX Jul 23, 19:50 UTCJul 23, 21:25 UTC1h 35m
2026-07-23 UAL2668 OMA → ORD Jul 23, 16:40 UTCJul 23, 18:00 UTC1h 20m
2026-07-23 UAL763 YYZ → ORD Jul 23, 13:12 UTCJul 23, 14:06 UTC54m
2026-07-23 UAL763 YYZ → ORD Jul 23, 13:05 UTCJul 23, 14:25 UTC1h 20m
2026-07-23 UAL436 SFO → BWI Jul 23, 06:40 UTCJul 23, 10:55 UTC4h 15m
2026-07-23 UAL436 SFO → BWI Jul 23, 06:27 UTCJul 23, 10:48 UTC4h 21m
2026-07-23 UAL2854 EWR → BZN Jul 23, 04:05 UTCJul 23, 05:05 UTC1h 0m
2026-07-23 UAL1321 MIA → EWR Jul 23, 01:10 UTCJul 23, 02:00 UTC50m
2026-07-22 UAL2823 IAD → EWR Jul 22, 22:40 UTCJul 22, 23:40 UTC1h 0m
2026-07-22 UAL8106 - Jul 22, 20:15 UTCJul 22, 21:20 UTC1h 5m
2026-07-22 UAL571 AUS → SFO Jul 22, 14:10 UTCJul 22, 18:30 UTC4h 20m
2026-07-22 UAL1603 ORD → PHX Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-22 UAL448 BOS → DEN Jul 22, 00:55 UTCJul 22, 02:55 UTC2h 0m
2026-07-21 UAL1151 SFO → YVR Jul 21, 21:50 UTCJul 21, 23:30 UTC1h 40m
2026-07-21 UAL2309 - Jul 21, 19:10 UTCJul 21, 20:15 UTC1h 5m
2026-07-21 UAL444 BNA → IAD Jul 21, 16:20 UTCJul 21, 17:30 UTC1h 10m
2026-07-21 UAL2056 LAS → SFO Jul 21, 06:30 UTCJul 21, 07:20 UTC50m
2026-07-21 UAL1427 MID → IAH Jul 21, 02:09 UTCJul 21, 03:11 UTC1h 2m
2026-07-21 UAL1427 MID → IAH Jul 21, 02:20 UTCJul 21, 03:15 UTC55m
2026-07-20 UAL1375 JAX → EWR Jul 20, 23:25 UTCJul 21, 00:40 UTC1h 14m
2026-07-20 UAL1375 JAX → EWR Jul 20, 22:57 UTCJul 21, 00:33 UTC1h 36m
2026-07-20 UAL430 DEN → ONT Jul 20, 17:50 UTCJul 20, 19:30 UTC1h 40m
2026-07-20 UAL1320 SFO → ONT Jul 20, 12:30 UTCJul 20, 15:50 UTC3h 20m
2026-07-20 UAL2350 SAN → ORD Jul 20, 00:40 UTCJul 20, 03:40 UTC3h 0m
2026-07-19 UAL1255 MCI → EWR Jul 19, 21:50 UTCJul 19, 22:45 UTC55m
2026-07-19 UAL1255 MCI → EWR Jul 19, 20:50 UTCJul 19, 21:15 UTC25m
2026-07-19 UAL1255 MCI → EWR Jul 19, 20:55 UTCJul 19, 22:39 UTC1h 44m
2026-07-19 UAL295 - Jul 19, 17:25 UTCJul 19, 19:20 UTC1h 55m
2026-07-19 UAL644 LAX → EWR Jul 19, 14:05 UTCJul 19, 15:35 UTC1h 30m
2026-07-19 UAL1565 SFO → PHX Jul 19, 04:10 UTCJul 19, 05:35 UTC1h 25m
2026-07-18 UAL296 ORD → FSD Jul 18, 17:45 UTCJul 19, 00:25 UTC6h 40m
2026-07-18 UAL2865 SBA → DEN Jul 18, 14:00 UTCJul 18, 16:00 UTC2h 0m
2026-07-18 UAL2479 DEN → SBA Jul 18, 01:54 UTCJul 18, 03:50 UTC1h 56m
2026-07-17 UAL1943 - Jul 17, 22:45 UTCJul 17, 23:50 UTC1h 5m
2026-07-17 UAL2327 - Jul 17, 20:15 UTCJul 17, 21:20 UTC1h 5m
2026-07-17 UAL1315 LAS → DEN Jul 17, 16:55 UTCJul 17, 18:34 UTC1h 40m
2026-07-17 UAL1264 - Jul 17, 12:40 UTCJul 17, 15:20 UTC2h 40m
2026-07-16 UAL618 - Jul 16, 22:40 UTCJul 17, 01:25 UTC2h 45m
2026-07-16 UAL1257 - Jul 16, 20:00 UTCJul 16, 21:15 UTC1h 15m

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 N77525 page for operator, model, and routing details .

Mode-S AA7E56 frequently asked

What is Mode-S code AA7E56?
AA7E56 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77525.
Where is Mode-S AA7E56 registered?
Mode-S code AA7E56 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 AA7E56 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA7E56, octal 52477126, decimal 11,173,462.
What flights does AA7E56 operate?
Mode-S AA7E56 has broadcast 20 distinct callsigns, including UAL2048, UAL245, UAL1794, UAL678, UAL565.