Apparatus

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sensors Mode-S transponder

A9EC06

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73860 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
A9EC06
Octal
52366006
Decimal
11,136,006
Country
US
Tail
N73860
Type
B753
No current signal · last broadcast Jul 26, 19:10 UTC
Flights observed
222
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:10 UTC

Last known position

Most recent position reported by Mode-S A9EC06.

Country allocation

The ICAO 24-bit address A9EC06 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
UAL1721 - 21 2026-07-18
UAL1722 - 18 2026-07-17
UAL1636 United Airlines 12 2026-07-26
UAL638 - 8 2026-06-30
UAL1224 United Airlines 8 2026-07-26
UAL1176 - 7 2026-06-30
UAL543 - 6 2026-07-10
UAL2276 - 6 2026-07-07
UAL2087 United Airlines 6 2026-06-08
UAL1941 - 6 2026-07-08
UAL2391 - 5 2026-06-29
UAL2348 - 5 2026-06-30
UAL1777 - 5 2026-07-11
UAL1719 - 5 2026-06-18
UAL1718 - 5 2026-06-18
UAL1577 - 5 2026-07-08
UAL1375 United Airlines 5 2026-07-09
UAL1221 United Airlines 5 2026-06-17
UAL1022 United Airlines 5 2026-07-01
UAL2633 United Airlines 4 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1224 SAT → SFO Jul 26, 18:40 UTCJul 26, 19:10 UTC30m
2026-07-26 UAL1636 LAX → SFO Jul 26, 06:20 UTCJul 26, 06:55 UTC36m
2026-07-26 UAL1636 LAX → SFO Jul 26, 02:10 UTCJul 26, 02:30 UTC20m
2026-07-25 UAL1224 SAT → SFO Jul 25, 18:55 UTCJul 25, 19:25 UTC30m
2026-07-25 UAL1224 SAT → SFO Jul 25, 19:05 UTCJul 26, 00:06 UTC5h 1m
2026-07-25 UAL1636 LAX → SFO Jul 25, 06:15 UTCJul 25, 06:55 UTC40m
2026-07-25 UAL1636 LAX → SFO Jul 25, 01:55 UTCJul 25, 02:15 UTC20m
2026-07-24 UAL1224 SAT → SFO Jul 24, 18:20 UTCJul 24, 23:45 UTC5h 25m
2026-07-24 UAL1636 LAX → SFO Jul 24, 02:10 UTCJul 24, 02:25 UTC15m
2026-07-24 UAL1636 LAX → SFO Jul 24, 01:53 UTCJul 24, 07:04 UTC5h 11m
2026-07-23 UAL1224 SAT → SFO Jul 23, 18:55 UTCJul 24, 00:20 UTC5h 25m
2026-07-21 UAL3929 IAH → SFO Jul 21, 22:25 UTCJul 21, 23:05 UTC40m
2026-07-21 UAL3929 IAH → SFO Jul 21, 18:20 UTCJul 21, 18:30 UTC10m
2026-07-18 UAL1721 - Jul 18, 20:15 UTCJul 18, 20:35 UTC20m
2026-07-18 UAL1721 SFO → KOA Jul 18, 15:32 UTCJul 18, 20:40 UTC5h 8m
2026-07-18 UAL1721 - Jul 18, 15:40 UTCJul 18, 16:10 UTC30m
2026-07-18 UAL1495 - Jul 18, 03:35 UTCJul 18, 07:20 UTC3h 45m
2026-07-17 UAL2317 EWR → AUS Jul 17, 21:05 UTCJul 18, 00:50 UTC3h 45m
2026-07-17 UAL1116 BOS → ORD Jul 17, 13:15 UTCJul 17, 16:49 UTC3h 35m
2026-07-17 UAL8148 ORD → SAT Jul 17, 06:23 UTCJul 17, 09:36 UTC3h 13m
2026-07-17 UAL8148 ORD → SAT Jul 17, 06:15 UTCJul 17, 09:55 UTC3h 40m
2026-07-17 UAL1722 - Jul 17, 01:45 UTCJul 17, 02:39 UTC55m
2026-07-16 UAL1722 - Jul 16, 22:05 UTCJul 16, 22:19 UTC15m
2026-07-16 UAL1721 - Jul 16, 20:15 UTCJul 16, 20:25 UTC10m
2026-07-16 UAL1721 - Jul 16, 15:30 UTCJul 16, 16:09 UTC40m
2026-07-15 UAL1116 ORD → SFO Jul 15, 12:55 UTCJul 15, 16:45 UTC3h 50m
2026-07-15 UAL2278 SFO → ORD Jul 15, 06:53 UTCJul 15, 10:32 UTC3h 39m
2026-07-15 UAL2278 SFO → ORD Jul 15, 06:55 UTCJul 15, 10:45 UTC3h 50m
2026-07-15 UAL1722 - Jul 15, 02:05 UTCJul 15, 02:40 UTC35m
2026-07-14 UAL1722 - Jul 14, 22:10 UTCJul 14, 22:20 UTC10m
2026-07-14 UAL1721 - Jul 14, 20:15 UTCJul 14, 20:35 UTC20m
2026-07-14 UAL1721 - Jul 14, 15:45 UTCJul 14, 16:20 UTC35m
2026-07-14 UAL1495 - Jul 14, 02:35 UTCJul 14, 06:15 UTC3h 40m
2026-07-14 UAL1495 ORD → SFO Jul 14, 02:23 UTCJul 14, 06:10 UTC3h 47m
2026-07-13 UAL2317 SFO → ORD Jul 13, 19:15 UTCJul 13, 23:20 UTC4h 5m
2026-07-13 UAL1116 ORD → SFO Jul 13, 13:00 UTCJul 13, 16:35 UTC3h 35m
2026-07-12 UAL913 - Jul 12, 12:35 UTCJul 12, 19:01 UTC6h 25m
2026-07-12 UAL912 - Jul 12, 08:25 UTCJul 12, 08:50 UTC25m
2026-07-12 UAL912 - Jul 12, 03:10 UTCJul 12, 03:50 UTC40m
2026-07-11 UAL457 - Jul 11, 20:05 UTCJul 11, 23:35 UTC3h 30m
2026-07-11 UAL2814 - Jul 11, 14:20 UTCJul 11, 17:50 UTC3h 30m
2026-07-11 UAL2814 ORD → LAX Jul 11, 14:18 UTCJul 11, 17:47 UTC3h 29m
2026-07-11 UAL1777 - Jul 11, 01:45 UTCJul 11, 02:10 UTC25m
2026-07-10 UAL1777 SFO → ORD Jul 10, 22:15 UTCJul 11, 02:10 UTC3h 55m
2026-07-10 UAL1777 SFO → ORD Jul 10, 22:06 UTCJul 11, 01:30 UTC3h 24m
2026-07-10 UAL543 - Jul 10, 20:15 UTCJul 10, 20:25 UTC10m
2026-07-10 UAL543 - Jul 10, 16:05 UTCJul 10, 20:10 UTC4h 5m
2026-07-09 UAL1777 SFO → ORD Jul 9, 22:35 UTCJul 10, 02:45 UTC4h 10m
2026-07-09 UAL543 - Jul 9, 16:20 UTCJul 9, 20:30 UTC4h 10m
2026-07-09 UAL543 ORD → SFO Jul 9, 16:31 UTCJul 9, 20:27 UTC3h 56m

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 N73860 page for operator, model, and routing details .

Mode-S A9EC06 frequently asked

What is Mode-S code A9EC06?
A9EC06 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73860.
Where is Mode-S A9EC06 registered?
Mode-S code A9EC06 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 A9EC06 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9EC06, octal 52366006, decimal 11,136,006.
What flights does A9EC06 operate?
Mode-S A9EC06 has broadcast 20 distinct callsigns, including UAL1721, UAL1722, UAL1636, UAL638, UAL1224.