Apparatus

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sensors Mode-S transponder

A03399

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N11193 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A03399
Octal
50031631
Decimal
10,498,969
Country
US
Tail
N11193
Type
E45X
No current signal · last broadcast Jul 22, 16:35 UTC
Flights observed
574
Distinct callsigns
20
Country
US
Last broadcast
Jul 22, 16:35 UTC

Last known position

Most recent position reported by Mode-S A03399.

Country allocation

The ICAO 24-bit address A03399 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
UCA4929 - 8 2026-07-13
UCA4378 - 8 2026-07-13
UCA4904 - 7 2026-07-12
UCA4830 - 7 2026-06-29
UCA4374 - 7 2026-07-12
UCA4334 - 7 2026-07-14
UCA4896 - 6 2026-07-02
UCA4844 - 6 2026-06-14
UCA4371 - 6 2026-06-29
UCA4370 CommutAir 6 2026-07-18
UCA4350 CommutAir 6 2026-06-14
UCA4331 CommutAir 6 2026-07-03
UCA4311 - 6 2026-07-21
UCA4289 - 6 2026-07-02
UCA4261 - 6 2026-06-30
UCA4887 CommutAir 5 2026-05-05
UCA4837 CommutAir 5 2026-06-01
UCA4365 - 5 2026-07-14
UCA4358 - 5 2026-07-13
UCA4349 CommutAir 5 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 UCA3263 YQB → IAD Jul 22, 15:30 UTCJul 22, 16:35 UTC1h 5m
2026-07-21 UCA4345 IAD → ORF Jul 21, 21:20 UTCJul 21, 22:05 UTC45m
2026-07-21 UCA4352 - Jul 21, 19:35 UTCJul 21, 20:20 UTC45m
2026-07-21 UCA4909 - Jul 21, 16:20 UTCJul 21, 17:50 UTC1h 30m
2026-07-21 UCA4909 HSV → IAH Jul 21, 16:31 UTCJul 21, 17:56 UTC1h 25m
2026-07-21 UCA4262 IAD → STL Jul 21, 13:25 UTCJul 21, 14:55 UTC1h 30m
2026-07-21 UCA4311 - Jul 21, 09:55 UTCJul 21, 11:05 UTC1h 10m
2026-07-21 UCA4311 TYS → IAD Jul 21, 10:00 UTCJul 21, 11:00 UTC1h 0m
2026-07-21 UCA4304 - Jul 21, 02:40 UTCJul 21, 03:50 UTC1h 10m
2026-07-21 UCA4304 IAD → TYS Jul 21, 02:28 UTCJul 21, 04:05 UTC1h 37m
2026-07-21 UCA4954 - Jul 21, 00:00 UTCJul 21, 00:50 UTC50m
2026-07-20 UCA4945 IAD → ITH Jul 20, 22:10 UTCJul 20, 22:45 UTC35m
2026-07-20 UCA4268 - Jul 20, 19:10 UTCJul 20, 19:40 UTC30m
2026-07-20 UCA4372 IAD → MDT Jul 20, 17:15 UTCJul 20, 17:40 UTC25m
2026-07-20 UCA4283 IAD → CMH Jul 20, 14:45 UTCJul 20, 15:45 UTC1h 0m
2026-07-20 UCA4818 IAD → CAE Jul 20, 12:36 UTCJul 20, 13:40 UTC1h 4m
2026-07-20 UCA4818 - Jul 20, 12:30 UTCJul 20, 13:25 UTC55m
2026-07-20 UCA4244 - Jul 20, 10:25 UTCJul 20, 10:55 UTC30m
2026-07-20 UCA4964 - Jul 20, 03:45 UTCJul 20, 04:10 UTC25m
2026-07-20 UCA4964 IAD → MDT Jul 20, 03:23 UTCJul 20, 04:08 UTC45m
2026-07-20 UCA4322 - Jul 20, 00:55 UTCJul 20, 02:15 UTC1h 20m
2026-07-20 UCA4322 CHS → IAD Jul 20, 00:27 UTCJul 20, 02:17 UTC1h 50m
2026-07-19 UCA4310 IAD → BTV Jul 19, 22:20 UTCJul 19, 23:35 UTC1h 15m
2026-07-19 UCA4310 IAD → BTV Jul 19, 22:08 UTCJul 19, 23:33 UTC1h 25m
2026-07-19 UCA4327 IAD → SYR Jul 19, 20:18 UTCJul 19, 20:52 UTC34m
2026-07-19 UCA4327 IAD → SYR Jul 19, 20:00 UTCJul 19, 20:55 UTC55m
2026-07-19 UCA4349 IAD → BTV Jul 19, 17:55 UTCJul 19, 18:35 UTC40m
2026-07-19 UCA4958 - Jul 19, 15:25 UTCJul 19, 16:25 UTC1h 0m
2026-07-19 UCA4961 - Jul 19, 13:35 UTCJul 19, 14:30 UTC55m
2026-07-19 UCA4251 IAD → BUF Jul 19, 10:25 UTCJul 19, 11:15 UTC50m
2026-07-19 UCA4849 - Jul 19, 02:45 UTCJul 19, 03:20 UTC35m
2026-07-18 UCA4840 - Jul 18, 18:10 UTCJul 18, 19:25 UTC1h 15m
2026-07-18 UCA4370 BTV → IAD Jul 18, 16:35 UTCJul 18, 16:50 UTC15m
2026-07-18 UCA4370 BTV → IAD Jul 18, 15:31 UTCJul 18, 15:36 UTC5m
2026-07-18 UCA4370 BTV → IAD Jul 18, 13:15 UTCJul 18, 14:35 UTC1h 20m
2026-07-17 UCA4332 ROA → IAD Jul 17, 15:29 UTCJul 17, 16:11 UTC42m
2026-07-17 UCA4368 IAD → ROA Jul 17, 12:50 UTCJul 17, 13:20 UTC30m
2026-07-17 UCA4251 IAD → BUF Jul 17, 10:35 UTCJul 17, 11:15 UTC40m
2026-07-17 UCA4849 - Jul 17, 03:50 UTCJul 17, 04:29 UTC40m
2026-07-17 UCA4259 - Jul 17, 01:09 UTCJul 17, 02:15 UTC1h 5m
2026-07-16 UCA4364 IAD → CAE Jul 16, 23:15 UTCJul 17, 00:14 UTC1h 0m
2026-07-16 UCA4328 - Jul 16, 19:10 UTCJul 16, 19:30 UTC20m
2026-07-16 UCA4815 - Jul 16, 17:14 UTCJul 16, 17:30 UTC15m
2026-07-16 UCA4815 IAD → CHO Jul 16, 17:15 UTCJul 16, 17:33 UTC18m
2026-07-16 UCA4834 - Jul 16, 14:55 UTCJul 16, 15:19 UTC25m
2026-07-16 UCA4834 SCE → IAD Jul 16, 15:02 UTCJul 16, 15:22 UTC20m
2026-07-16 UCA4319 - Jul 16, 13:05 UTCJul 16, 13:25 UTC20m
2026-07-16 UCA4319 IAD → SCE Jul 16, 13:01 UTCJul 16, 13:36 UTC35m
2026-07-16 UCA4244 - Jul 16, 10:25 UTCJul 16, 10:59 UTC35m
2026-07-16 UCA4964 - Jul 16, 02:50 UTCJul 16, 03:15 UTC25m

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 N11193 page for operator, model, and routing details .

Mode-S A03399 frequently asked

What is Mode-S code A03399?
A03399 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N11193.
Where is Mode-S A03399 registered?
Mode-S code A03399 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 A03399 broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 16:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A03399, octal 50031631, decimal 10,498,969.
What flights does A03399 operate?
Mode-S A03399 has broadcast 20 distinct callsigns, including UCA4929, UCA4378, UCA4904, UCA4830, UCA4374.