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
Broadcasting now · callsign UCA4906 · 111,800 ft
Flights observed
512
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A03399 is currently broadcasting. Map zoomed to live position.

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
UCA4350 CommutAir 6 2026-06-14
UCA4331 CommutAir 6 2026-07-03
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
UCA4323 - 5 2026-06-16
UCA4317 - 5 2026-07-10
UCA4282 CommutAir 5 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UCA4318 - Jul 14, 14:20 UTCJul 14, 15:30 UTC1h 10m
2026-07-14 UCA4334 - Jul 14, 03:15 UTCJul 14, 03:55 UTC40m
2026-07-14 UCA4334 IAH → JAN Jul 14, 03:17 UTCJul 14, 04:13 UTC56m
2026-07-14 UCA4365 - Jul 14, 00:55 UTCJul 14, 01:45 UTC50m
2026-07-13 UCA4929 - Jul 13, 23:05 UTCJul 14, 00:05 UTC1h 0m
2026-07-13 UCA4929 IAH → BRO Jul 13, 23:09 UTCJul 14, 00:09 UTC1h 0m
2026-07-13 UCA4378 - Jul 13, 19:45 UTCJul 13, 21:50 UTC2h 5m
2026-07-13 UCA4358 - Jul 13, 15:10 UTCJul 13, 16:35 UTC1h 25m
2026-07-13 UCA4264 - Jul 13, 12:50 UTCJul 13, 14:05 UTC1h 15m
2026-07-13 UCA4264 BTR → IAH Jul 13, 12:30 UTCJul 13, 13:51 UTC1h 21m
2026-07-13 UCA4828 - Jul 13, 02:50 UTCJul 13, 03:30 UTC40m
2026-07-13 UCA4828 IAH → BTR Jul 13, 02:56 UTCJul 13, 03:29 UTC33m
2026-07-13 UCA4290 - Jul 13, 00:10 UTCJul 13, 01:25 UTC1h 15m
2026-07-12 UCA4239 - Jul 12, 21:55 UTCJul 12, 23:05 UTC1h 10m
2026-07-12 UCA4374 LRD → IAH Jul 12, 19:22 UTCJul 12, 19:59 UTC37m
2026-07-12 UCA4374 - Jul 12, 19:10 UTCJul 12, 20:01 UTC50m
2026-07-12 UCA4904 - Jul 12, 17:15 UTCJul 12, 18:05 UTC50m
2026-07-12 UCA4904 IAH → LRD Jul 12, 17:29 UTCJul 12, 18:03 UTC34m
2026-07-12 UCA4947 - Jul 12, 14:50 UTCJul 12, 15:45 UTC55m
2026-07-12 UCA4260 - Jul 12, 12:40 UTCJul 12, 13:20 UTC40m
2026-07-11 UCA4374 - Jul 11, 19:40 UTCJul 11, 20:40 UTC1h 0m
2026-07-11 UCA4374 LRD → IAH Jul 11, 19:41 UTCJul 11, 20:36 UTC55m
2026-07-11 UCA4904 - Jul 11, 17:45 UTCJul 11, 18:40 UTC55m
2026-07-11 UCA4989 - Jul 11, 14:10 UTCJul 11, 15:20 UTC1h 10m
2026-07-11 UCA4989 MOB → IAH Jul 11, 14:12 UTCJul 11, 15:17 UTC1h 5m
2026-07-10 UCA4295 - Jul 10, 23:50 UTCJul 11, 01:45 UTC1h 55m
2026-07-10 UCA4942 - Jul 10, 19:30 UTCJul 10, 20:35 UTC1h 5m
2026-07-10 UCA4317 - Jul 10, 17:10 UTCJul 10, 18:05 UTC55m
2026-07-10 UCA4317 IAD → ALB Jul 10, 17:00 UTCJul 10, 18:06 UTC1h 6m
2026-07-10 UCA4857 - Jul 10, 13:35 UTCJul 10, 14:55 UTC1h 20m
2026-07-10 UCA4270 IAD → MHT Jul 10, 02:30 UTCJul 10, 03:40 UTC1h 10m
2026-07-10 UCA4954 - Jul 10, 00:20 UTCJul 10, 01:15 UTC55m
2026-07-09 UCA3267 - Jul 9, 22:10 UTCJul 9, 23:30 UTC1h 20m
2026-07-09 UCA4962 - Jul 9, 17:00 UTCJul 9, 17:55 UTC55m
2026-07-09 UCA4889 - Jul 9, 14:15 UTCJul 9, 15:20 UTC1h 5m
2026-07-09 UCA4321 IAD → ALB Jul 9, 02:25 UTCJul 9, 03:25 UTC1h 0m
2026-07-08 UCA4268 - Jul 8, 19:05 UTCJul 8, 19:35 UTC30m
2026-07-08 UCA4372 - Jul 8, 16:55 UTCJul 8, 17:20 UTC25m
2026-07-08 UCA4372 IAD → MDT Jul 8, 17:05 UTCJul 8, 17:20 UTC15m
2026-07-08 UCA4840 - Jul 8, 14:35 UTCJul 8, 15:35 UTC1h 0m
2026-07-08 UCA4370 - Jul 8, 12:50 UTCJul 8, 13:35 UTC45m
2026-07-08 UCA4860 - Jul 8, 10:10 UTCJul 8, 11:05 UTC55m
2026-07-08 UCA4856 IAD → SYR Jul 8, 02:52 UTCJul 8, 03:58 UTC1h 6m
2026-07-07 UCA4235 ALB → IAD Jul 7, 23:40 UTCJul 8, 00:45 UTC1h 5m
2026-07-07 UCA4812 - Jul 7, 17:20 UTCJul 7, 18:20 UTC1h 0m
2026-07-07 UCA4840 - Jul 7, 15:10 UTCJul 7, 16:05 UTC55m
2026-07-07 UCA4370 - Jul 7, 13:30 UTCJul 7, 14:15 UTC45m
2026-07-07 UCA4370 IAD → SYR Jul 7, 13:20 UTCJul 7, 14:17 UTC57m
2026-07-07 UCA4311 - Jul 7, 09:55 UTCJul 7, 11:10 UTC1h 15m
2026-07-07 UCA4311 TYS → IAD Jul 7, 10:00 UTCJul 7, 11:09 UTC1h 9m

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?
Yes. Mode-S A03399 is currently airborne.
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.