Apparatus

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sensors Mode-S transponder

AA7E7A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77536 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA7E7A
Octal
52477172
Decimal
11,173,498
Country
US
Tail
N77536
Type
B738
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
496
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S AA7E7A.

Country allocation

The ICAO 24-bit address AA7E7A 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
UAL703 - 6 2026-07-09
UAL1799 United Airlines 6 2026-06-02
UAL467 - 5 2026-07-20
UAL517 United Airlines 4 2026-07-22
UAL478 - 4 2026-07-09
UAL2456 United Airlines 4 2026-06-05
UAL2181 - 4 2026-07-18
UAL2167 United Airlines 4 2026-06-08
UAL2086 - 4 2026-07-17
UAL1299 United Airlines 4 2026-05-03
UAL1243 United Airlines 4 2026-05-08
UAL786 United Airlines 3 2026-07-07
UAL696 - 3 2026-06-18
UAL685 United Airlines 3 2026-07-21
UAL544 United Airlines 3 2026-06-05
UAL456 - 3 2026-07-12
UAL318 - 3 2026-06-13
UAL2789 United Airlines 3 2026-07-23
UAL2753 United Airlines 3 2026-06-05
UAL275 United Airlines 3 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2821 HNL → EWR Jul 26, 20:15 UTCJul 26, 22:30 UTC2h 15m
2026-07-26 UAL1522 FLL → EWR Jul 26, 16:30 UTCJul 26, 18:30 UTC2h 0m
2026-07-25 UAL1953 SAV → EWR Jul 25, 19:41 UTCJul 25, 21:33 UTC1h 52m
2026-07-25 UAL1953 SAV → EWR Jul 25, 19:40 UTCJul 25, 21:35 UTC1h 55m
2026-07-25 UAL1832 CUN → IAH Jul 25, 13:15 UTCJul 25, 17:50 UTC4h 35m
2026-07-25 UAL1832 CUN → IAH Jul 25, 13:25 UTCJul 25, 17:46 UTC4h 21m
2026-07-24 UAL2131 PBI → EWR Jul 24, 20:35 UTCJul 25, 00:50 UTC4h 15m
2026-07-24 UAL2101 PBI → EWR Jul 24, 13:20 UTCJul 24, 18:40 UTC5h 20m
2026-07-23 UAL2275 SEA → IAD Jul 23, 21:10 UTCJul 24, 00:45 UTC3h 35m
2026-07-23 UAL2459 DEN → YYC Jul 23, 17:45 UTCJul 23, 19:34 UTC1h 49m
2026-07-23 UAL2459 DEN → YYC Jul 23, 17:40 UTCJul 23, 19:35 UTC1h 55m
2026-07-23 UAL2789 GUM → SFO Jul 23, 14:55 UTCJul 23, 15:55 UTC1h 0m
2026-07-23 UAL2789 GUM → SFO Jul 23, 14:50 UTCJul 23, 15:52 UTC1h 2m
2026-07-23 UAL2166 TPA → SFO Jul 23, 01:25 UTCJul 23, 02:30 UTC1h 5m
2026-07-22 UAL517 JFK → LAX Jul 22, 19:40 UTCJul 22, 23:40 UTC4h 0m
2026-07-22 UAL517 JFK → LAX Jul 22, 19:47 UTCJul 22, 23:37 UTC3h 50m
2026-07-22 UAL786T ORD → BTV Jul 22, 16:35 UTCJul 22, 18:05 UTC1h 30m
2026-07-22 UAL786T ORD → BTV Jul 22, 16:29 UTCJul 22, 18:03 UTC1h 34m
2026-07-22 UAL1491 PHL → ORD Jul 22, 13:10 UTCJul 22, 14:10 UTC1h 0m
2026-07-22 UAL1851 PDX → IAH Jul 22, 01:40 UTCJul 22, 02:40 UTC1h 0m
2026-07-21 UAL2299 LAS → SFO Jul 21, 21:30 UTCJul 21, 23:30 UTC2h 0m
2026-07-21 UAL685 IAH → EWR Jul 21, 17:45 UTCJul 21, 19:30 UTC1h 45m
2026-07-21 UAL1355 CLE → ORD Jul 21, 14:25 UTCJul 21, 15:30 UTC1h 5m
2026-07-21 UAL1355 CLE → ORD Jul 21, 14:27 UTCJul 21, 15:22 UTC55m
2026-07-21 UAL2097 SFO → EWR Jul 21, 08:52 UTCJul 21, 12:59 UTC4h 7m
2026-07-21 UAL2097 SFO → EWR Jul 21, 08:45 UTCJul 21, 13:00 UTC4h 15m
2026-07-21 UAL2837 NRT → SFO Jul 21, 06:10 UTCJul 21, 07:35 UTC1h 25m
2026-07-21 UAL1236 EWR → PHX Jul 21, 03:30 UTCJul 21, 05:00 UTC1h 30m
2026-07-20 UAL467 MSP → DEN Jul 20, 23:40 UTCJul 21, 01:20 UTC1h 40m
2026-07-20 UAL2150 - Jul 20, 19:30 UTCJul 20, 22:05 UTC2h 35m
2026-07-20 UAL2150 IAH → MSP Jul 20, 19:40 UTCJul 20, 22:01 UTC2h 21m
2026-07-20 UAL1447 JAX → EWR Jul 20, 14:05 UTCJul 20, 14:30 UTC25m
2026-07-20 UAL1447 JAX → EWR Jul 20, 14:13 UTCJul 20, 17:19 UTC3h 6m
2026-07-19 UAL1280 - Jul 19, 23:00 UTCJul 20, 02:10 UTC3h 10m
2026-07-19 UAL692 LGA → IAH Jul 19, 17:19 UTCJul 19, 20:15 UTC2h 56m
2026-07-19 UAL692 - Jul 19, 17:15 UTCJul 19, 20:20 UTC3h 5m
2026-07-19 UAL1697 - Jul 19, 12:10 UTCJul 19, 15:10 UTC3h 0m
2026-07-19 UAL1066 - Jul 19, 02:50 UTCJul 19, 06:15 UTC3h 25m
2026-07-19 UAL1066 LGA → IAH Jul 19, 02:35 UTCJul 19, 06:13 UTC3h 38m
2026-07-18 UAL2181 - Jul 18, 22:15 UTCJul 19, 01:20 UTC3h 5m
2026-07-18 UAL2181 IAH → LGA Jul 18, 22:06 UTCJul 19, 01:27 UTC3h 21m
2026-07-18 UAL722 - Jul 18, 13:30 UTCJul 18, 15:45 UTC2h 15m
2026-07-17 UAL277 - Jul 17, 22:25 UTCJul 18, 00:50 UTC2h 25m
2026-07-17 UAL2263 PVR → IAH Jul 17, 18:32 UTCJul 17, 20:12 UTC1h 40m
2026-07-17 UAL1622 - Jul 17, 14:50 UTCJul 17, 20:15 UTC5h 25m
2026-07-17 UAL2205 - Jul 17, 11:00 UTCJul 17, 13:10 UTC2h 10m
2026-07-17 UAL2086 - Jul 17, 01:35 UTCJul 17, 03:45 UTC2h 10m
2026-07-17 UAL2086 IAH → CMH Jul 17, 01:33 UTCJul 17, 03:42 UTC2h 9m
2026-07-16 UAL1834 - Jul 16, 21:35 UTCJul 16, 23:29 UTC1h 55m
2026-07-16 UAL1501 - Jul 16, 18:34 UTCJul 16, 20:19 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 N77536 page for operator, model, and routing details .

Mode-S AA7E7A frequently asked

What is Mode-S code AA7E7A?
AA7E7A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77536.
Where is Mode-S AA7E7A registered?
Mode-S code AA7E7A 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 AA7E7A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA7E7A, octal 52477172, decimal 11,173,498.
What flights does AA7E7A operate?
Mode-S AA7E7A has broadcast 20 distinct callsigns, including UAL703, UAL1799, UAL467, UAL517, UAL478.