Apparatus

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sensors Mode-S transponder

A11FC6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17138 · EMBRAER ERJ-145XR · operated by UNITED AIRLINES INC

Hex
A11FC6
Octal
50217706
Decimal
10,559,430
Country
US
Tail
N17138
Type
E45X
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
517
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S A11FC6.

Country allocation

The ICAO 24-bit address A11FC6 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
UCA4905 - 7 2026-06-23
UCA4902 CommutAir 7 2026-07-22
UCA4822 CommutAir 7 2026-07-25
UCA4818 - 6 2026-07-04
UCA4816 - 6 2026-06-27
UCA4350 - 6 2026-07-17
UCA4231 CommutAir 6 2026-07-25
UCA4854 CommutAir 5 2026-05-29
UCA4831 CommutAir 5 2026-06-06
UCA4376 - 5 2026-07-14
UCA4300 - 5 2026-07-09
UCA4283 - 5 2026-07-04
UCA4266 CommutAir 5 2026-06-10
UCA4233 CommutAir 5 2026-07-26
UCA4980 CommutAir 4 2026-05-15
UCA4953 CommutAir 4 2026-05-18
UCA4934 - 4 2026-07-21
UCA4921 - 4 2026-07-21
UCA4919 - 4 2026-06-25
UCA4909 - 4 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA4326 IAD → YUL Jul 26, 19:15 UTCJul 26, 20:00 UTC45m
2026-07-26 UCA4336 IAD → PVD Jul 26, 17:15 UTCJul 26, 18:05 UTC50m
2026-07-26 UCA4233 HSV → IAH Jul 26, 14:55 UTCJul 26, 16:10 UTC1h 15m
2026-07-26 UCA4233 HSV → IAH Jul 26, 14:38 UTCJul 26, 16:07 UTC1h 29m
2026-07-26 UCA4279 ORF → IAD Jul 26, 01:05 UTCJul 26, 02:10 UTC1h 5m
2026-07-26 UCA4279 ORF → IAD Jul 26, 01:08 UTCJul 26, 02:17 UTC1h 9m
2026-07-25 UCA4345 IAD → ORF Jul 25, 21:20 UTCJul 25, 22:05 UTC45m
2026-07-25 UCA4352 IAD → BDL Jul 25, 19:30 UTCJul 25, 20:20 UTC50m
2026-07-25 UCA4822 BHM → IAH Jul 25, 16:25 UTCJul 25, 17:40 UTC1h 15m
2026-07-25 UCA4231 SGF → IAH Jul 25, 12:55 UTCJul 25, 14:15 UTC1h 20m
2026-07-25 UCA4231 SGF → IAH Jul 25, 12:53 UTCJul 25, 14:15 UTC1h 22m
2026-07-24 UCA4255 IAH → BRO Jul 24, 11:45 UTCJul 24, 13:10 UTC1h 25m
2026-07-24 UCA4343 IAD → PHL Jul 24, 02:40 UTCJul 24, 04:00 UTC1h 20m
2026-07-23 UCA4893 LBB → IAH Jul 23, 23:35 UTCJul 24, 01:20 UTC1h 45m
2026-07-23 UCA4879 GPT → IAH Jul 23, 21:20 UTCJul 23, 22:45 UTC1h 25m
2026-07-23 UCA4255 IAH → BRO Jul 23, 11:35 UTCJul 23, 13:00 UTC1h 25m
2026-07-22 UCA4902 IAD → PHL Jul 22, 20:25 UTCJul 22, 21:45 UTC1h 20m
2026-07-21 UCA4867 TUL → IAH Jul 21, 22:15 UTCJul 21, 23:35 UTC1h 20m
2026-07-21 UCA4934 - Jul 21, 19:25 UTCJul 21, 19:45 UTC20m
2026-07-21 UCA4934 LCH → IAH Jul 21, 19:27 UTCJul 21, 19:42 UTC15m
2026-07-21 UCA4921 - Jul 21, 17:40 UTCJul 21, 18:00 UTC20m
2026-07-20 UCA4902 IAD → PHL Jul 20, 21:25 UTCJul 20, 21:45 UTC20m
2026-07-20 UCA4902 IAD → PHL Jul 20, 19:40 UTCJul 20, 21:45 UTC2h 5m
2026-07-20 UCA4902 IAD → PHL Jul 20, 19:49 UTCJul 20, 21:06 UTC1h 17m
2026-07-19 UCA4838 - Jul 19, 20:10 UTCJul 19, 21:20 UTC1h 10m
2026-07-19 UCA4301 - Jul 19, 18:00 UTCJul 19, 19:10 UTC1h 10m
2026-07-19 UCA4301 IAH → OKC Jul 19, 18:07 UTCJul 19, 19:02 UTC55m
2026-07-19 UCA4271 BRO → IAH Jul 19, 16:05 UTCJul 19, 16:55 UTC50m
2026-07-18 UCA4327 IAD → SYR Jul 18, 21:35 UTCJul 18, 22:20 UTC45m
2026-07-18 UCA4835 MFE → IAH Jul 18, 19:25 UTCJul 18, 20:20 UTC55m
2026-07-18 UCA4298 - Jul 18, 17:30 UTCJul 18, 18:20 UTC50m
2026-07-18 UCA4357 - Jul 18, 14:40 UTCJul 18, 15:35 UTC55m
2026-07-18 UCA4285 - Jul 18, 00:15 UTCJul 18, 01:05 UTC50m
2026-07-18 UCA4285 IAH → LRD Jul 18, 00:12 UTCJul 18, 01:01 UTC49m
2026-07-17 UCA4365 - Jul 17, 22:05 UTCJul 17, 22:55 UTC50m
2026-07-17 UCA4365 BRO → IAH Jul 17, 22:03 UTCJul 17, 22:53 UTC50m
2026-07-17 UCA4929 - Jul 17, 20:15 UTCJul 17, 21:00 UTC45m
2026-07-17 UCA4237 - Jul 17, 17:25 UTCJul 17, 18:10 UTC45m
2026-07-17 UCA4350 - Jul 17, 15:44 UTCJul 17, 16:29 UTC45m
2026-07-17 UCA4863 - Jul 17, 12:10 UTCJul 17, 13:29 UTC1h 20m
2026-07-16 UCA4306 - Jul 16, 22:15 UTCJul 16, 23:25 UTC1h 10m
2026-07-16 UCA4859 LBB → IAH Jul 16, 19:35 UTCJul 16, 21:10 UTC1h 35m
2026-07-16 UCA4354 - Jul 16, 17:14 UTCJul 16, 18:25 UTC1h 10m
2026-07-16 UCA4373 - Jul 16, 14:35 UTCJul 16, 15:35 UTC1h 0m
2026-07-15 UCA4273 - Jul 15, 19:55 UTCJul 15, 20:45 UTC50m
2026-07-15 UCA4361 - Jul 15, 17:05 UTCJul 15, 18:35 UTC1h 30m
2026-07-15 UCA4361 OKC → IAH Jul 15, 17:15 UTCJul 15, 18:19 UTC1h 4m
2026-07-15 UCA4344 - Jul 15, 15:00 UTCJul 15, 16:00 UTC1h 0m
2026-07-15 UCA4344 IAH → OKC Jul 15, 15:06 UTCJul 15, 16:21 UTC1h 15m
2026-07-14 UCA4247 - Jul 14, 23:55 UTCJul 15, 00:30 UTC35m

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 N17138 page for operator, model, and routing details .

Mode-S A11FC6 frequently asked

What is Mode-S code A11FC6?
A11FC6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17138.
Where is Mode-S A11FC6 registered?
Mode-S code A11FC6 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 A11FC6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11FC6, octal 50217706, decimal 10,559,430.
What flights does A11FC6 operate?
Mode-S A11FC6 has broadcast 20 distinct callsigns, including UCA4905, UCA4902, UCA4822, UCA4818, UCA4816.