Apparatus

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sensors Mode-S transponder

A39D11

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N33182 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A39D11
Octal
50716421
Decimal
10,722,577
Country
US
Tail
N33182
Type
E45X
Broadcasting now · callsign UCA4939 · 13,175 ft
Flights observed
574
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Current position

A39D11 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A39D11 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
UCA4932 - 12 2026-07-07
UCA4942 - 10 2026-07-08
UCA4857 - 9 2026-07-11
UCA4831 - 8 2026-06-27
UCA4810 - 8 2026-07-14
UCA4978 CommutAir 7 2026-06-07
UCA4930 - 7 2026-07-11
UCA4925 - 7 2026-07-11
UCA4317 - 7 2026-07-08
UCA4961 - 6 2026-07-05
UCA4878 CommutAir 6 2026-06-14
UCA4853 - 6 2026-07-10
UCA4833 - 6 2026-06-20
UCA4364 - 6 2026-07-10
UCA4359 - 6 2026-07-12
UCA4330 CommutAir 6 2026-06-05
UCA4328 CommutAir 6 2026-05-20
UCA4259 - 6 2026-07-11
UCA4257 - 6 2026-07-03
UCA4977 - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UCA4950 - Jul 14, 02:45 UTCJul 14, 03:25 UTC40m
2026-07-14 UCA4810 - Jul 14, 00:15 UTCJul 14, 00:55 UTC40m
2026-07-13 UCA4308 IAD → ORF Jul 13, 22:05 UTCJul 13, 22:40 UTC35m
2026-07-13 UCA4327 - Jul 13, 19:20 UTCJul 13, 20:10 UTC50m
2026-07-13 UCA4349 - Jul 13, 17:35 UTCJul 13, 18:20 UTC45m
2026-07-13 UCA3280 IAD → IAD Jul 13, 14:17 UTCJul 13, 14:43 UTC26m
2026-07-13 UCA3280 IAD → IAD Jul 13, 14:10 UTCJul 13, 14:35 UTC25m
2026-07-12 UCA4324 - Jul 12, 15:35 UTCJul 12, 16:25 UTC50m
2026-07-12 UCA4236 - Jul 12, 13:01 UTCJul 12, 13:55 UTC55m
2026-07-12 UCA4359 - Jul 12, 10:15 UTCJul 12, 10:45 UTC30m
2026-07-12 UCA4252 - Jul 12, 03:45 UTCJul 12, 04:20 UTC35m
2026-07-12 UCA4252 IAD → SCE Jul 12, 03:38 UTCJul 12, 04:44 UTC1h 6m
2026-07-12 UCA4313 - Jul 12, 01:15 UTCJul 12, 02:20 UTC1h 5m
2026-07-11 UCA4963 - Jul 11, 23:25 UTCJul 12, 00:20 UTC55m
2026-07-11 UCA4963 IAD → GSP Jul 11, 23:03 UTCJul 12, 00:22 UTC1h 19m
2026-07-11 UCA4925 - Jul 11, 19:55 UTCJul 11, 21:25 UTC1h 30m
2026-07-11 UCA4925 MHT → IAD Jul 11, 19:45 UTCJul 11, 21:23 UTC1h 38m
2026-07-11 UCA4930 IAD → MHT Jul 11, 17:35 UTCJul 11, 18:50 UTC1h 15m
2026-07-11 UCA4857 - Jul 11, 13:35 UTCJul 11, 14:50 UTC1h 15m
2026-07-11 UCA4857 MHT → IAD Jul 11, 13:39 UTCJul 11, 14:50 UTC1h 11m
2026-07-11 UCA4270 IAD → MHT Jul 11, 03:01 UTCJul 11, 04:10 UTC1h 10m
2026-07-11 UCA4259 - Jul 11, 00:40 UTCJul 11, 01:45 UTC1h 5m
2026-07-10 UCA4364 - Jul 10, 22:35 UTCJul 10, 23:50 UTC1h 15m
2026-07-10 UCA4291 - Jul 10, 19:55 UTCJul 10, 20:55 UTC1h 0m
2026-07-10 UCA4335 IAD → BUF Jul 10, 17:50 UTCJul 10, 18:40 UTC50m
2026-07-10 UCA4889 - Jul 10, 14:15 UTCJul 10, 15:15 UTC1h 0m
2026-07-10 UCA4926 - Jul 10, 12:30 UTCJul 10, 13:25 UTC55m
2026-07-10 UCA4853 - Jul 10, 02:25 UTCJul 10, 03:15 UTC50m
2026-07-10 UCA4853 SYR → IAD Jul 10, 02:27 UTCJul 10, 03:17 UTC50m
2026-07-10 UCA4977 - Jul 10, 00:10 UTCJul 10, 01:00 UTC50m
2026-07-09 UCA4840 - Jul 9, 14:40 UTCJul 9, 15:30 UTC50m
2026-07-09 UCA4370 IAD → SYR Jul 9, 12:50 UTCJul 9, 13:46 UTC56m
2026-07-09 UCA4370 - Jul 9, 12:35 UTCJul 9, 13:20 UTC45m
2026-07-09 UCA4860 - Jul 9, 10:10 UTCJul 9, 11:00 UTC50m
2026-07-09 UCA4856 - Jul 9, 02:50 UTCJul 9, 03:35 UTC45m
2026-07-09 UCA4856 IAD → SYR Jul 9, 02:43 UTCJul 9, 03:59 UTC1h 16m
2026-07-09 UCA4954 ITH → IAD Jul 9, 00:06 UTCJul 9, 00:34 UTC28m
2026-07-08 UCA4954 - Jul 8, 23:55 UTCJul 9, 00:35 UTC40m
2026-07-08 UCA4945 - Jul 8, 22:10 UTCJul 8, 22:45 UTC35m
2026-07-08 UCA4942 - Jul 8, 19:00 UTCJul 8, 20:15 UTC1h 15m
2026-07-08 UCA4942 ALB → IAD Jul 8, 19:04 UTCJul 8, 20:06 UTC1h 2m
2026-07-08 UCA4317 IAD → ALB Jul 8, 17:00 UTCJul 8, 17:43 UTC43m
2026-07-08 UCA4317 IAD → ALB Jul 8, 16:50 UTCJul 8, 17:45 UTC55m
2026-07-08 UCA4857 - Jul 8, 13:35 UTCJul 8, 14:50 UTC1h 15m
2026-07-08 UCA4857 MHT → IAD Jul 8, 13:39 UTCJul 8, 14:52 UTC1h 13m
2026-07-07 UCA4932 IAD → MHT Jul 7, 21:40 UTCJul 7, 22:50 UTC1h 10m
2026-07-07 UCA4932 IAD → MHT Jul 7, 21:38 UTCJul 7, 22:42 UTC1h 4m
2026-07-07 UCA4925 - Jul 7, 19:10 UTCJul 7, 20:35 UTC1h 25m
2026-07-07 UCA4930 IAD → MHT Jul 7, 16:45 UTCJul 7, 17:55 UTC1h 10m
2026-07-07 UCA4954 - Jul 7, 00:40 UTCJul 7, 01:25 UTC45m

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 N33182 page for operator, model, and routing details .

Mode-S A39D11 frequently asked

What is Mode-S code A39D11?
A39D11 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N33182.
Where is Mode-S A39D11 registered?
Mode-S code A39D11 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 A39D11 broadcasting right now?
Yes. Mode-S A39D11 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39D11, octal 50716421, decimal 10,722,577.
What flights does A39D11 operate?
Mode-S A39D11 has broadcast 20 distinct callsigns, including UCA4932, UCA4942, UCA4857, UCA4831, UCA4810.