Apparatus

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sensors Mode-S transponder

A0F8F1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N16183 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A0F8F1
Octal
50174361
Decimal
10,549,489
Country
US
Tail
N16183
Type
E45X
No current signal · last broadcast 3h ago
Flights observed
557
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A0F8F1.

Country allocation

The ICAO 24-bit address A0F8F1 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
UCA4867 - 9 2026-07-07
UCA4852 - 8 2026-07-08
UCA4231 - 7 2026-07-13
UCA4980 - 6 2026-07-12
UCA4816 - 6 2026-06-24
UCA4376 - 6 2026-07-12
UCA4356 - 6 2026-07-11
UCA4355 - 6 2026-07-12
UCA4346 - 6 2026-07-10
UCA4341 - 6 2026-06-25
UCA4255 - 6 2026-07-14
UCA4234 - 6 2026-07-04
UCA4228 - 6 2026-07-12
UCA4945 - 5 2026-07-03
UCA4842 - 5 2026-07-13
UCA4366 - 5 2026-07-14
UCA4350 - 5 2026-06-16
UCA4344 - 5 2026-07-10
UCA4309 CommutAir 5 2026-06-09
UCA4282 - 5 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 UCA4279 - Jul 15, 01:05 UTCJul 15, 02:20 UTC1h 15m
2026-07-14 UCA4379 - Jul 14, 21:40 UTCJul 14, 22:35 UTC55m
2026-07-14 UCA4379 MFE → IAH Jul 14, 21:46 UTCJul 14, 22:30 UTC44m
2026-07-14 UCA4366 - Jul 14, 19:50 UTCJul 14, 20:15 UTC25m
2026-07-14 UCA4366 IAH → MFE Jul 14, 19:54 UTCJul 14, 20:56 UTC1h 2m
2026-07-14 UCA4830 - Jul 14, 17:30 UTCJul 14, 18:15 UTC45m
2026-07-14 UCA4830 LIT → IAH Jul 14, 17:13 UTCJul 14, 18:29 UTC1h 16m
2026-07-14 UCA4371 - Jul 14, 15:00 UTCJul 14, 15:50 UTC50m
2026-07-14 UCA4371 IAH → LIT Jul 14, 15:08 UTCJul 14, 15:55 UTC47m
2026-07-14 UCA4255 - Jul 14, 11:35 UTCJul 14, 13:45 UTC2h 10m
2026-07-14 UCA4343 - Jul 14, 01:35 UTCJul 14, 02:55 UTC1h 20m
2026-07-13 UCA4842 - Jul 13, 23:00 UTCJul 14, 00:30 UTC1h 30m
2026-07-13 UCA4842 ECP → IAH Jul 13, 22:58 UTCJul 14, 00:30 UTC1h 32m
2026-07-13 UCA4902 - Jul 13, 19:50 UTCJul 13, 21:10 UTC1h 20m
2026-07-13 UCA4902 IAH → ECP Jul 13, 20:04 UTCJul 13, 21:10 UTC1h 6m
2026-07-13 UCA4822 - Jul 13, 16:25 UTCJul 13, 18:10 UTC1h 45m
2026-07-13 UCA4822 BHM → IAH Jul 13, 16:36 UTCJul 13, 18:16 UTC1h 40m
2026-07-13 UCA4231 - Jul 13, 13:00 UTCJul 13, 14:25 UTC1h 25m
2026-07-12 UCA4228 - Jul 12, 23:55 UTCJul 13, 01:20 UTC1h 25m
2026-07-12 UCA4256 - Jul 12, 21:40 UTCJul 12, 23:00 UTC1h 20m
2026-07-12 UCA4980 - Jul 12, 19:15 UTCJul 12, 20:15 UTC1h 0m
2026-07-12 UCA4980 HRL → IAH Jul 12, 19:13 UTCJul 12, 20:11 UTC58m
2026-07-12 UCA4287 - Jul 12, 17:25 UTCJul 12, 18:05 UTC40m
2026-07-12 UCA4376 - Jul 12, 15:01 UTCJul 12, 16:05 UTC1h 5m
2026-07-12 UCA4376 MFE → IAH Jul 12, 14:58 UTCJul 12, 16:03 UTC1h 5m
2026-07-12 UCA4355 - Jul 12, 12:55 UTCJul 12, 13:40 UTC45m
2026-07-12 UCA4941 - Jul 12, 10:15 UTCJul 12, 10:55 UTC40m
2026-07-12 UCA4254 - Jul 12, 01:30 UTCJul 12, 02:10 UTC40m
2026-07-11 UCA4923 - Jul 11, 22:30 UTCJul 11, 23:35 UTC1h 5m
2026-07-11 UCA4307 - Jul 11, 20:25 UTCJul 11, 21:25 UTC1h 0m
2026-07-11 UCA4356 - Jul 11, 17:40 UTCJul 11, 18:20 UTC40m
2026-07-11 UCA4906 - Jul 11, 16:00 UTCJul 11, 16:25 UTC25m
2026-07-11 UCA4255 - Jul 11, 11:55 UTCJul 11, 13:20 UTC1h 25m
2026-07-11 UCA4255 ECP → IAH Jul 11, 11:43 UTCJul 11, 13:23 UTC1h 40m
2026-07-11 UCA4343 - Jul 11, 01:35 UTCJul 11, 02:55 UTC1h 20m
2026-07-11 UCA4343 IAH → ECP Jul 11, 01:28 UTCJul 11, 02:52 UTC1h 24m
2026-07-10 UCA4348 - Jul 10, 23:00 UTCJul 11, 00:00 UTC1h 0m
2026-07-10 UCA4814 - Jul 10, 21:10 UTCJul 10, 21:55 UTC45m
2026-07-10 UCA4814 IAH → JAN Jul 10, 21:00 UTCJul 10, 22:05 UTC1h 5m
2026-07-10 UCA4361 - Jul 10, 19:40 UTCJul 10, 20:05 UTC25m
2026-07-10 UCA4361 OKC → CLL Jul 10, 17:15 UTCJul 10, 18:45 UTC1h 30m
2026-07-10 UCA4344 - Jul 10, 15:05 UTCJul 10, 16:10 UTC1h 5m
2026-07-10 UCA4344 IAH → OKC Jul 10, 15:06 UTCJul 10, 16:06 UTC1h 0m
2026-07-10 UCA4346 - Jul 10, 12:30 UTCJul 10, 13:20 UTC50m
2026-07-09 UCA4832 - Jul 9, 22:35 UTCJul 9, 23:20 UTC45m
2026-07-09 UCA4832 IAH → BRO Jul 9, 22:39 UTCJul 9, 23:31 UTC52m
2026-07-09 UCA4289 - Jul 9, 19:30 UTCJul 9, 20:15 UTC45m
2026-07-09 UCA4896 - Jul 9, 17:35 UTCJul 9, 18:20 UTC45m
2026-07-09 UCA4224 AMA → IAH Jul 9, 14:20 UTCJul 9, 15:24 UTC1h 4m
2026-07-09 UCA4839 - Jul 9, 01:55 UTCJul 9, 02:55 UTC1h 0m

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 N16183 page for operator, model, and routing details .

Mode-S A0F8F1 frequently asked

What is Mode-S code A0F8F1?
A0F8F1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N16183.
Where is Mode-S A0F8F1 registered?
Mode-S code A0F8F1 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 A0F8F1 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F8F1, octal 50174361, decimal 10,549,489.
What flights does A0F8F1 operate?
Mode-S A0F8F1 has broadcast 20 distinct callsigns, including UCA4867, UCA4852, UCA4231, UCA4980, UCA4816.