Apparatus

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sensors Mode-S transponder

AA8A07

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77865 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
AA8A07
Octal
52505007
Decimal
11,176,455
Country
US
Tail
N77865
Type
B753
No current signal · last broadcast Jul 23, 23:10 UTC
Flights observed
340
Distinct callsigns
20
Country
US
Last broadcast
Jul 23, 23:10 UTC

Last known position

Most recent position reported by Mode-S AA8A07.

Country allocation

The ICAO 24-bit address AA8A07 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
UAL1221 - 14 2026-07-20
UAL599 - 12 2026-07-04
UAL1719 - 12 2026-07-21
UAL1718 United Airlines 12 2026-07-21
UAL1431 United Airlines 12 2026-07-18
UAL1722 United Airlines 10 2026-06-08
UAL1721 United Airlines 10 2026-06-07
UAL638 - 9 2026-07-17
UAL2276 United Airlines 9 2026-07-21
UAL2268 - 9 2026-07-21
UAL2087 - 9 2026-07-05
UAL1495 United Airlines 9 2026-06-10
UAL457 - 7 2026-07-09
UAL2814 - 7 2026-07-13
UAL2348 - 7 2026-07-17
UAL2292 United Airlines 7 2026-04-30
UAL1654 - 7 2026-07-02
UAL1509 United Airlines 7 2026-07-20
UAL1176 - 7 2026-07-17
UAL501 United Airlines 6 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 UAL501 MCO → EWR Jul 23, 20:10 UTCJul 23, 23:10 UTC3h 0m
2026-07-23 UAL1865 SLC → EWR Jul 23, 14:20 UTCJul 23, 17:30 UTC3h 10m
2026-07-22 UAL347 PHL → DEN Jul 22, 20:20 UTCJul 22, 23:00 UTC2h 40m
2026-07-22 UAL1865 SLC → EWR Jul 22, 15:20 UTCJul 22, 18:25 UTC3h 5m
2026-07-22 UAL2282 SAN → IAD Jul 22, 11:10 UTCJul 22, 11:15 UTC5m
2026-07-21 UAL2276 IAD → LAX Jul 21, 23:50 UTCJul 22, 04:30 UTC4h 40m
2026-07-21 UAL2268 - Jul 21, 15:50 UTCJul 21, 20:50 UTC5h 0m
2026-07-21 UAL1719 - Jul 21, 12:15 UTCJul 21, 12:55 UTC40m
2026-07-21 UAL1719 - Jul 21, 08:15 UTCJul 21, 08:20 UTC5m
2026-07-21 UAL1718 LAS → LAX Jul 21, 05:15 UTCJul 21, 05:35 UTC20m
2026-07-21 UAL1718 LAS → LAX Jul 21, 00:25 UTCJul 21, 00:55 UTC30m
2026-07-20 UAL1221 - Jul 20, 20:55 UTCJul 20, 22:10 UTC1h 15m
2026-07-20 UAL1221 - Jul 20, 17:25 UTCJul 20, 17:40 UTC15m
2026-07-20 UAL1509 SFO → HNL Jul 20, 05:30 UTCJul 20, 05:45 UTC15m
2026-07-20 UAL1509 SFO → HNL Jul 20, 00:45 UTCJul 20, 01:40 UTC55m
2026-07-19 UAL373 - Jul 19, 21:10 UTCJul 19, 22:00 UTC50m
2026-07-19 UAL373 - Jul 19, 17:20 UTCJul 19, 17:35 UTC15m
2026-07-18 UAL1431 IAH → SNA Jul 18, 21:50 UTCJul 19, 03:00 UTC5h 10m
2026-07-18 UAL1868 LAX → EWR Jul 18, 15:35 UTCJul 18, 19:50 UTC4h 15m
2026-07-18 UAL8115 - Jul 18, 07:25 UTCJul 18, 11:55 UTC4h 30m
2026-07-18 UAL8115 LAX → IAD Jul 18, 07:13 UTCJul 18, 11:53 UTC4h 40m
2026-07-18 UAL2276 - Jul 18, 01:15 UTCJul 18, 05:35 UTC4h 21m
2026-07-17 UAL347 DEN → IAD Jul 17, 20:12 UTCJul 17, 23:17 UTC3h 5m
2026-07-17 UAL347 DEN → IAD Jul 17, 20:15 UTCJul 17, 23:20 UTC3h 5m
2026-07-17 UAL2348 SFO → DEN Jul 17, 15:55 UTCJul 17, 18:00 UTC2h 5m
2026-07-17 UAL1176 - Jul 17, 09:25 UTCJul 17, 14:00 UTC4h 35m
2026-07-17 UAL638 - Jul 17, 07:20 UTCJul 17, 07:35 UTC15m
2026-07-17 UAL638 - Jul 17, 02:34 UTCJul 17, 03:25 UTC50m
2026-07-16 UAL1577 RNO → SFO Jul 16, 20:05 UTCJul 17, 00:04 UTC4h 0m
2026-07-16 UAL1941 - Jul 16, 14:29 UTCJul 16, 18:05 UTC3h 35m
2026-07-15 UAL2276 - Jul 15, 22:20 UTCJul 16, 02:40 UTC4h 20m
2026-07-15 UAL2268 - Jul 15, 15:55 UTCJul 15, 20:30 UTC4h 35m
2026-07-15 UAL2268 LAX → IAD Jul 15, 15:52 UTCJul 15, 20:29 UTC4h 37m
2026-07-15 UAL1719 - Jul 15, 12:20 UTCJul 15, 12:55 UTC35m
2026-07-15 UAL1719 - Jul 15, 08:15 UTCJul 15, 08:25 UTC10m
2026-07-15 UAL1718 - Jul 15, 05:25 UTCJul 15, 05:35 UTC10m
2026-07-15 UAL1718 - Jul 15, 00:25 UTCJul 15, 00:55 UTC30m
2026-07-14 UAL1221 - Jul 14, 20:55 UTCJul 14, 21:55 UTC1h 0m
2026-07-14 UAL1221 - Jul 14, 17:10 UTCJul 14, 17:20 UTC10m
2026-07-13 UAL1431 - Jul 13, 20:50 UTCJul 14, 01:55 UTC5h 5m
2026-07-13 UAL2814 - Jul 13, 14:15 UTCJul 13, 17:40 UTC3h 25m
2026-07-12 UAL1777 SFO → ORD Jul 12, 21:55 UTCJul 13, 01:30 UTC3h 35m
2026-07-12 UAL543 ORD → SFO Jul 12, 16:05 UTCJul 12, 19:55 UTC3h 50m
2026-07-09 UAL457 - Jul 9, 22:45 UTCJul 10, 02:15 UTC3h 30m
2026-07-09 UAL457 LAX → ORD Jul 9, 22:48 UTCJul 10, 01:58 UTC3h 10m
2026-07-09 UAL2814 ORD → LAX Jul 9, 17:25 UTCJul 9, 20:59 UTC3h 34m
2026-07-09 UAL2814 - Jul 9, 17:30 UTCJul 9, 21:05 UTC3h 35m
2026-07-08 UAL457 - Jul 8, 20:05 UTCJul 8, 23:40 UTC3h 35m
2026-07-08 UAL1868 - Jul 8, 13:35 UTCJul 8, 18:10 UTC4h 35m
2026-07-07 UAL347 DEN → IAD Jul 7, 20:40 UTCJul 7, 23:40 UTC3h 0m

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 N77865 page for operator, model, and routing details .

Mode-S AA8A07 frequently asked

What is Mode-S code AA8A07?
AA8A07 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77865.
Where is Mode-S AA8A07 registered?
Mode-S code AA8A07 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 AA8A07 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 23:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA8A07, octal 52505007, decimal 11,176,455.
What flights does AA8A07 operate?
Mode-S AA8A07 has broadcast 20 distinct callsigns, including UAL1221, UAL599, UAL1719, UAL1718, UAL1431.