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 4h ago
Flights observed
262
Distinct callsigns
20
Country
US
Last broadcast
4h 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 CommutAir 6 2026-05-26
UCA4852 CommutAir 5 2026-05-27
UCA4356 CommutAir 5 2026-05-27
UCA4980 CommutAir 4 2026-05-21
UCA4816 CommutAir 4 2026-05-12
UCA4346 CommutAir 4 2026-05-29
UCA4261 CommutAir 4 2026-05-11
UCA4258 CommutAir 4 2026-05-16
UCA4233 CommutAir 4 2026-04-29
UCA4229 CommutAir 4 2026-05-05
UCA4945 - 3 2026-04-13
UCA4872 CommutAir 3 2026-05-29
UCA4863 CommutAir 3 2026-05-04
UCA4309 CommutAir 3 2026-05-29
UCA4306 CommutAir 3 2026-05-03
UCA4300 CommutAir 3 2026-05-11
UCA4290 CommutAir 3 2026-05-28
UCA4272 CommutAir 3 2026-05-20
UCA4263 CommutAir 3 2026-05-10
UCA4255 CommutAir 3 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 UCA4269 PVD → IAD May 30, 00:45 UTCMay 30, 02:20 UTC1h 35m
2026-05-29 UCA4978 LBB → IAH May 29, 22:00 UTCMay 29, 23:10 UTC1h 10m
2026-05-29 UCA4872 BRO → IAH May 29, 20:00 UTCMay 29, 21:05 UTC1h 5m
2026-05-29 UCA4294 IAD → PVD May 29, 17:30 UTCMay 29, 18:25 UTC55m
2026-05-29 UCA4820 PWM → IAD May 29, 15:30 UTCMay 29, 16:15 UTC45m
2026-05-29 UCA4346 IAD → YOW May 29, 12:45 UTCMay 29, 13:45 UTC1h 0m
2026-05-29 UCA4309 IAD → CVG May 29, 01:45 UTCMay 29, 02:25 UTC40m
2026-05-28 UCA4290 IAD → ORF May 28, 22:10 UTCMay 28, 23:20 UTC1h 10m
2026-05-28 UCA4239 IAD → PVD May 28, 20:15 UTCMay 28, 21:20 UTC1h 5m
2026-05-28 UCA4294 IAD → PVD May 28, 17:20 UTCMay 28, 18:10 UTC50m
2026-05-28 UCA4820 PWM → IAD May 28, 15:10 UTCMay 28, 15:55 UTC45m
2026-05-28 UCA4232 MOB → IAH May 28, 12:55 UTCMay 28, 13:45 UTC50m
2026-05-28 UCA4919 IAH → TUL May 28, 01:55 UTCMay 28, 02:35 UTC40m
2026-05-28 UCA4919 IAH → TUL May 28, 01:53 UTCMay 28, 02:39 UTC46m
2026-05-27 UCA4923 MOB → IAH May 27, 22:15 UTCMay 27, 23:25 UTC1h 10m
2026-05-27 UCA4307 BTV → IAD May 27, 20:15 UTCMay 27, 21:20 UTC1h 5m
2026-05-27 UCA4356 LFT → IAH May 27, 17:05 UTCMay 27, 17:40 UTC35m
2026-05-27 UCA4356 LFT → IAH May 27, 17:15 UTCMay 27, 17:41 UTC26m
2026-05-27 UCA4906 IAH → LFT May 27, 15:20 UTCMay 27, 15:45 UTC25m
2026-05-27 UCA4852 SGF → IAH May 27, 12:05 UTCMay 27, 14:15 UTC2h 10m
2026-05-27 UCA4852 SGF → IAH May 27, 12:05 UTCMay 27, 14:15 UTC2h 10m
2026-05-26 UCA4867 TUL → IAH May 26, 22:50 UTCMay 27, 00:10 UTC1h 20m
2026-05-26 UCA4867 TUL → IAH May 26, 22:59 UTCMay 27, 00:21 UTC1h 22m
2026-05-26 UCA4905 HSV → IAH May 26, 20:00 UTCMay 26, 21:44 UTC1h 45m
2026-05-26 UCA4905 HSV → IAH May 26, 20:05 UTCMay 26, 21:26 UTC1h 21m
2026-05-26 UCA4286 PWM → IAD May 26, 17:25 UTCMay 26, 18:59 UTC1h 35m
2026-05-26 UCA4332 ROA → IAD May 26, 15:14 UTCMay 26, 15:54 UTC40m
2026-05-26 UCA4368 IAD → ROA May 26, 13:40 UTCMay 26, 14:20 UTC40m
2026-05-26 UCA4970 ALB → IAD May 26, 10:50 UTCMay 26, 11:54 UTC1h 5m
2026-05-23 UCA4926 IAD → ALB May 23, 22:00 UTCMay 23, 22:55 UTC55m
2026-05-23 UCA4340 HSV → IAD May 23, 18:30 UTCMay 23, 19:55 UTC1h 25m
2026-05-23 UCA4315 IAH → HSV May 23, 15:30 UTCMay 23, 17:15 UTC1h 45m
2026-05-23 UCA4330 LCH → IAH May 23, 13:30 UTCMay 23, 13:55 UTC25m
2026-05-23 UCA4985 IAH → LCH May 23, 01:50 UTCMay 23, 02:05 UTC15m
2026-05-22 UCA3280 IAD → YQB May 22, 16:55 UTCMay 22, 17:55 UTC1h 0m
2026-05-22 UCA437A IAH → GPT May 22, 01:35 UTCMay 22, 02:30 UTC55m
2026-05-21 UCA4247 PVD → IAD May 21, 23:15 UTCMay 21, 23:50 UTC35m
2026-05-21 UCA4247 PVD → IAD May 21, 23:12 UTCMay 21, 23:49 UTC37m
2026-05-21 UCA4341 PWM → IAD May 21, 21:45 UTCMay 21, 22:25 UTC40m
2026-05-21 UCA4980 BTR → IAH May 21, 19:40 UTCMay 21, 20:30 UTC50m
2026-05-21 UCA4287 IAH → HRL May 21, 17:25 UTCMay 21, 18:20 UTC55m
2026-05-20 UCA4243 ORF → IAD May 20, 20:35 UTCMay 20, 21:40 UTC1h 5m
2026-05-20 UCA4272 IAH → GPT May 20, 18:45 UTCMay 20, 19:40 UTC55m
2026-05-20 UCA4878 MOB → IAH May 20, 16:30 UTCMay 20, 17:45 UTC1h 15m
2026-05-20 UCA4878 MOB → IAH May 20, 16:31 UTCMay 20, 17:49 UTC1h 18m
2026-05-19 UCA4295 IAD → MOB May 19, 22:55 UTCMay 20, 00:45 UTC1h 50m
2026-05-19 UCA4959 GSP → IAD May 19, 20:20 UTCMay 19, 21:25 UTC1h 5m
2026-05-19 UCA4962 IAD → GSP May 19, 18:24 UTCMay 19, 19:21 UTC57m
2026-05-19 UCA4240 HSV → IAD May 19, 15:50 UTCMay 19, 17:20 UTC1h 30m
2026-05-19 UCA4228 - May 19, 13:30 UTCMay 19, 14:50 UTC1h 20m

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 4h 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, UCA4356, UCA4980, UCA4816.