Apparatus

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sensors Mode-S transponder

AAA58B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N78501 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AAA58B
Octal
52522613
Decimal
11,183,499
Country
US
Tail
N78501
Type
B738
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
450
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S AAA58B.

Country allocation

The ICAO 24-bit address AAA58B 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
UAL691 - 5 2026-06-16
UAL687 - 5 2026-07-01
UAL493 United Airlines 5 2026-07-20
UAL2768 United Airlines 5 2026-07-21
UAL1854 United Airlines 5 2026-05-14
UAL1793 - 5 2026-06-29
UAL484 - 4 2026-06-16
UAL467 - 4 2026-07-12
UAL347 - 4 2026-06-16
UAL2660 - 4 2026-07-03
UAL2011 - 4 2026-06-15
UAL1422 United Airlines 4 2026-07-24
UAL1354 United Airlines 4 2026-06-15
UAL719 - 3 2026-06-16
UAL696 - 3 2026-06-17
UAL690 United Airlines 3 2026-05-11
UAL669 - 3 2026-06-29
UAL539 United Airlines 3 2026-07-22
UAL456 - 3 2026-06-28
UAL362 United Airlines 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL400 AUS → IAD Jul 26, 20:25 UTCJul 26, 22:45 UTC2h 20m
2026-07-26 UAL2030 DEN → CUN Jul 26, 16:15 UTCJul 26, 19:10 UTC2h 55m
2026-07-26 UAL1214 DEN → EWR Jul 26, 06:20 UTCJul 26, 07:05 UTC46m
2026-07-26 UAL1269 LGA → IAH Jul 26, 01:25 UTCJul 26, 03:20 UTC1h 55m
2026-07-25 UAL2232 ORD → MSP Jul 25, 21:50 UTCJul 25, 23:50 UTC2h 0m
2026-07-25 UAL1023 DEN → TPA Jul 25, 17:55 UTCJul 25, 19:45 UTC1h 50m
2026-07-25 UAL2149 DEN → SMF Jul 25, 14:45 UTCJul 25, 16:45 UTC2h 0m
2026-07-25 UAL362 HNL → EWR Jul 25, 10:30 UTCJul 25, 12:20 UTC1h 50m
2026-07-24 UAL1422 SFO → MFR Jul 24, 23:45 UTCJul 25, 01:20 UTC1h 35m
2026-07-24 UAL1662 EWR → SFO Jul 24, 20:46 UTCJul 24, 21:40 UTC54m
2026-07-24 UAL1662 EWR → SFO Jul 24, 20:35 UTCJul 24, 21:40 UTC1h 5m
2026-07-24 UAL1963 IAH → BDL Jul 24, 17:55 UTCJul 24, 19:00 UTC1h 5m
2026-07-24 UAL318 EWR → DEN Jul 24, 12:10 UTCJul 24, 15:50 UTC3h 40m
2026-07-23 UAL2348 IAH → LGA Jul 23, 22:45 UTCJul 24, 02:05 UTC3h 20m
2026-07-23 UAL1788 SFO → IAH Jul 23, 19:55 UTCJul 23, 20:35 UTC40m
2026-07-23 UAL1714 LAS → IAH Jul 23, 17:55 UTCJul 23, 18:30 UTC35m
2026-07-23 UAL2459 STL → DEN Jul 23, 14:20 UTCJul 23, 16:15 UTC1h 55m
2026-07-23 UAL1422 SFO → MFR Jul 23, 05:35 UTCJul 23, 07:15 UTC1h 40m
2026-07-23 UAL1422 SFO → MFR Jul 23, 05:21 UTCJul 23, 07:12 UTC1h 51m
2026-07-23 UAL2395 EWR → PBI Jul 23, 02:25 UTCJul 23, 03:50 UTC1h 25m
2026-07-22 UAL267 BOS → DEN Jul 22, 21:10 UTCJul 22, 22:25 UTC1h 15m
2026-07-22 UAL1712 - Jul 22, 16:35 UTCJul 22, 19:40 UTC3h 5m
2026-07-22 UAL539 PHL → SFO Jul 22, 12:40 UTCJul 22, 14:30 UTC1h 50m
2026-07-21 UAL2768 IAH → SFO Jul 21, 01:15 UTCJul 21, 03:15 UTC2h 0m
2026-07-20 UAL2809 - Jul 20, 22:00 UTCJul 20, 23:35 UTC1h 35m
2026-07-20 UAL493 CLE → IAD Jul 20, 19:35 UTCJul 20, 19:50 UTC15m
2026-07-20 UAL493 CLE → IAD Jul 20, 18:45 UTCJul 20, 19:50 UTC1h 5m
2026-07-20 UAL493 CLE → IAD Jul 20, 18:46 UTCJul 20, 19:20 UTC34m
2026-07-20 UAL2849 EWR → DOM Jul 20, 16:15 UTCJul 20, 17:05 UTC50m
2026-07-20 UAL2771 - Jul 20, 12:20 UTCJul 20, 13:55 UTC1h 35m
2026-07-20 UAL1748 - Jul 20, 00:25 UTCJul 20, 01:50 UTC1h 25m
2026-07-16 UAL2628 PHX → ORD Jul 16, 20:49 UTCJul 16, 23:55 UTC3h 5m
2026-07-16 UAL2822 ORD → PHX Jul 16, 15:55 UTCJul 16, 18:50 UTC2h 55m
2026-07-16 UAL2151 PDX → DEN Jul 16, 13:15 UTCJul 16, 14:05 UTC50m
2026-07-16 UAL630 ORD → MSN Jul 16, 04:25 UTCJul 16, 05:05 UTC40m
2026-07-16 UAL2768 LGA → ORD Jul 16, 00:57 UTCJul 16, 02:46 UTC1h 49m
2026-07-16 UAL2768 - Jul 16, 01:05 UTCJul 16, 02:45 UTC1h 40m
2026-07-15 UAL2809 - Jul 15, 22:10 UTCJul 15, 23:45 UTC1h 35m
2026-07-15 UAL1830 LGA → ORD Jul 15, 01:50 UTCJul 15, 03:35 UTC1h 45m
2026-07-14 UAL2306 ORD → LGA Jul 14, 22:50 UTCJul 15, 00:30 UTC1h 40m
2026-07-14 UAL2306 ORD → LGA Jul 14, 22:33 UTCJul 15, 00:30 UTC1h 57m
2026-07-14 UAL249 YVR → ORD Jul 14, 07:05 UTCJul 14, 10:35 UTC3h 30m
2026-07-14 UAL1580 ORD → YVR Jul 14, 01:55 UTCJul 14, 05:45 UTC3h 50m
2026-07-13 UAL791 - Jul 13, 22:40 UTCJul 14, 00:15 UTC1h 35m
2026-07-13 UAL2124 - Jul 13, 19:50 UTCJul 13, 21:15 UTC1h 25m
2026-07-13 UAL2306 PDX → ORD Jul 13, 14:10 UTCJul 13, 18:05 UTC3h 55m
2026-07-13 UAL1770 DEN → PDX Jul 13, 03:45 UTCJul 13, 06:01 UTC2h 15m
2026-07-12 UAL467 MSP → DEN Jul 12, 23:35 UTCJul 13, 01:10 UTC1h 35m
2026-07-12 UAL2150 - Jul 12, 19:30 UTCJul 12, 22:05 UTC2h 35m
2026-07-12 UAL2421 TPA → IAH Jul 12, 16:07 UTCJul 12, 17:50 UTC1h 43m

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 N78501 page for operator, model, and routing details .

Mode-S AAA58B frequently asked

What is Mode-S code AAA58B?
AAA58B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N78501.
Where is Mode-S AAA58B registered?
Mode-S code AAA58B 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 AAA58B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAA58B, octal 52522613, decimal 11,183,499.
What flights does AAA58B operate?
Mode-S AAA58B has broadcast 20 distinct callsigns, including UAL691, UAL687, UAL493, UAL2768, UAL1854.