Apparatus

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sensors Mode-S transponder

AA5690

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N76504 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA5690
Octal
52453220
Decimal
11,163,280
Country
US
Tail
N76504
Type
B738
No current signal · last broadcast Jul 26, 05:05 UTC
Flights observed
474
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 05:05 UTC

Last known position

Most recent position reported by Mode-S AA5690.

Country allocation

The ICAO 24-bit address AA5690 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
UAL2446 - 8 2026-07-14
UAL1881 - 7 2026-07-11
UAL1813 - 7 2026-07-17
UAL1973 - 6 2026-07-09
UAL762 - 5 2026-07-14
UAL679 - 4 2026-07-14
UAL645 United Airlines 4 2026-05-05
UAL589 - 4 2026-06-29
UAL2808 United Airlines 4 2026-05-29
UAL2627 United Airlines 4 2026-05-05
UAL2028 - 4 2026-07-04
UAL1604 - 4 2026-07-11
UAL1189 United Airlines 4 2026-04-25
UAL1174 - 4 2026-06-28
UAL694 United Airlines 3 2026-07-08
UAL550 - 3 2026-06-26
UAL302 United Airlines 3 2026-06-11
UAL2759 United Airlines 3 2026-05-24
UAL2643 United Airlines 3 2026-05-05
UAL2449 United Airlines 3 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL3873 SEA → DEN Jul 26, 04:10 UTCJul 26, 05:05 UTC55m
2026-07-25 UAL2651 TPA → EWR Jul 25, 23:35 UTCJul 26, 01:55 UTC2h 20m
2026-07-25 UAL2651 TPA → EWR Jul 25, 23:32 UTCJul 26, 01:47 UTC2h 15m
2026-07-25 UAL2032 LAX → SFO Jul 25, 18:40 UTCJul 25, 22:00 UTC3h 20m
2026-07-25 UAL2032 LAX → SFO Jul 25, 18:54 UTCJul 25, 22:03 UTC3h 9m
2026-07-25 UAL1310 EWR → JAX Jul 25, 14:38 UTCJul 25, 16:33 UTC1h 55m
2026-07-25 UAL1310 EWR → JAX Jul 25, 14:55 UTCJul 25, 16:50 UTC1h 55m
2026-07-24 UAL2783 SFO → GUM Jul 24, 23:55 UTCJul 25, 03:00 UTC3h 5m
2026-07-24 UAL2783 SFO → GUM Jul 24, 23:52 UTCJul 25, 02:58 UTC3h 6m
2026-07-24 UAL1976 BOS → IAH Jul 24, 17:55 UTCJul 24, 21:25 UTC3h 30m
2026-07-24 UAL1977 - Jul 24, 12:45 UTCJul 24, 16:10 UTC3h 25m
2026-07-23 UAL618 EWR → DEN Jul 23, 22:10 UTCJul 24, 01:00 UTC2h 50m
2026-07-23 UAL1257 DEN → LGA Jul 23, 19:45 UTCJul 23, 20:55 UTC1h 10m
2026-07-23 UAL1113 ORD → MSP Jul 23, 17:10 UTCJul 23, 18:15 UTC1h 5m
2026-07-23 UAL1980 BOS → SFO Jul 23, 13:45 UTCJul 23, 15:00 UTC1h 15m
2026-07-23 UAL2278 ORD → SEA Jul 23, 04:15 UTCJul 23, 05:30 UTC1h 15m
2026-07-23 UAL1561 SFO → PDX Jul 23, 01:20 UTCJul 23, 02:30 UTC1h 10m
2026-07-22 UAL2077 PBI → EWR Jul 22, 22:00 UTCJul 22, 23:15 UTC1h 15m
2026-07-22 UAL2077 PBI → EWR Jul 22, 21:35 UTCJul 22, 23:11 UTC1h 36m
2026-07-22 UAL318 EWR → DEN Jul 22, 17:25 UTCJul 22, 19:35 UTC2h 10m
2026-07-22 UAL1424 ORD → AUS Jul 22, 14:40 UTCJul 22, 15:52 UTC1h 12m
2026-07-22 UAL1424 ORD → AUS Jul 22, 14:45 UTCJul 22, 15:55 UTC1h 10m
2026-07-21 UAL1184 IAH → MSY Jul 21, 23:55 UTCJul 22, 01:05 UTC1h 10m
2026-07-21 UAL2155 - Jul 21, 21:00 UTCJul 21, 21:55 UTC55m
2026-07-21 UAL2383 PHL → DEN Jul 21, 18:00 UTCJul 21, 18:50 UTC50m
2026-07-21 UAL2853 DEN → EWR Jul 21, 14:00 UTCJul 21, 15:45 UTC1h 45m
2026-07-21 UAL2819 DEN → SAT Jul 21, 00:10 UTCJul 21, 01:55 UTC1h 45m
2026-07-20 UAL2745 HNL → SFO Jul 20, 20:00 UTCJul 20, 22:20 UTC2h 20m
2026-07-20 UAL2637 DEN → GRR Jul 20, 16:30 UTCJul 20, 18:40 UTC2h 10m
2026-07-20 UAL2637 DEN → GRR Jul 20, 16:19 UTCJul 20, 18:37 UTC2h 18m
2026-07-19 UAL1788 - Jul 19, 19:55 UTCJul 19, 20:30 UTC35m
2026-07-19 UAL1788 GJT → DEN Jul 19, 19:52 UTCJul 19, 20:25 UTC33m
2026-07-19 UAL1714 - Jul 19, 17:50 UTCJul 19, 18:05 UTC15m
2026-07-19 UAL1774 ORD → EWR Jul 19, 14:55 UTCJul 19, 16:45 UTC1h 50m
2026-07-19 UAL1172 - Jul 19, 01:40 UTCJul 19, 03:20 UTC1h 40m
2026-07-18 UAL1322 - Jul 18, 22:55 UTCJul 18, 23:45 UTC50m
2026-07-18 UAL513 - Jul 18, 19:45 UTCJul 18, 20:20 UTC35m
2026-07-18 UAL513 DEN → BZN Jul 18, 19:49 UTCJul 18, 21:01 UTC1h 12m
2026-07-18 UAL2375 PDX → DEN Jul 18, 16:00 UTCJul 18, 18:10 UTC2h 10m
2026-07-17 UAL1677 ORD → PDX Jul 17, 22:00 UTCJul 18, 01:54 UTC3h 55m
2026-07-17 UAL1310 LGA → ORD Jul 17, 14:35 UTCJul 17, 16:40 UTC2h 5m
2026-07-17 UAL2617 SFO → LAX Jul 17, 11:20 UTCJul 17, 12:55 UTC1h 35m
2026-07-17 UAL1813 - Jul 17, 04:29 UTCJul 17, 05:15 UTC45m
2026-07-17 UAL1813 CVG → ORD Jul 17, 04:37 UTCJul 17, 04:56 UTC19m
2026-07-16 UAL2370 ORD → CVG Jul 16, 19:53 UTCJul 16, 20:49 UTC56m
2026-07-16 UAL2370 ORD → CVG Jul 16, 20:05 UTCJul 16, 20:55 UTC50m
2026-07-16 UAL1968 - Jul 16, 14:50 UTCJul 16, 17:45 UTC2h 55m
2026-07-16 UAL8256 ORD → YYC Jul 16, 01:50 UTCJul 16, 04:45 UTC2h 55m
2026-07-15 UAL1813 - Jul 15, 23:15 UTCJul 15, 23:25 UTC10m
2026-07-15 UAL1813 - Jul 15, 22:20 UTCJul 15, 23:25 UTC1h 5m

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 N76504 page for operator, model, and routing details .

Mode-S AA5690 frequently asked

What is Mode-S code AA5690?
AA5690 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N76504.
Where is Mode-S AA5690 registered?
Mode-S code AA5690 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 AA5690 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 05:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA5690, octal 52453220, decimal 11,163,280.
What flights does AA5690 operate?
Mode-S AA5690 has broadcast 20 distinct callsigns, including UAL2446, UAL1881, UAL1813, UAL1973, UAL762.