Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A11FC1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17133 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A11FC1
Octal
50217701
Decimal
10,559,425
Country
US
Tail
N17133
Type
B752
No current signal · last broadcast Jul 26, 18:25 UTC
Flights observed
240
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:25 UTC

Last known position

Most recent position reported by Mode-S A11FC1.

Country allocation

The ICAO 24-bit address A11FC1 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
UAL2788 - 9 2026-07-07
UAL37 - 8 2026-07-15
UAL229 - 8 2026-07-01
UAL145 - 8 2026-06-22
UAL2191 - 7 2026-07-15
UAL350 - 6 2026-06-22
UAL2679 United Airlines 6 2026-06-08
UAL2127 - 6 2026-07-12
UAL144 - 6 2026-06-22
UAL698 - 5 2026-07-11
UAL648 - 5 2026-07-11
UAL36 - 5 2026-07-15
UAL351 - 5 2026-06-23
UAL2743 United Airlines 5 2026-07-25
UAL2434 - 5 2026-07-12
UAL118 - 5 2026-07-07
UAL979 - 4 2026-07-09
UAL419 United Airlines 4 2026-07-24
UAL239 - 4 2026-07-06
UAL228 - 4 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL913 HNL → SFO Jul 26, 12:19 UTCJul 26, 18:12 UTC5h 53m
2026-07-26 UAL913 HNL → SFO Jul 26, 12:05 UTCJul 26, 12:15 UTC10m
2026-07-26 UAL912 KEF → ORD Jul 26, 03:05 UTCJul 26, 08:50 UTC5h 46m
2026-07-25 UAL661 ORD → EWR Jul 25, 22:05 UTCJul 25, 22:45 UTC40m
2026-07-25 UAL661 ORD → EWR Jul 25, 21:12 UTCJul 25, 22:27 UTC1h 15m
2026-07-25 UAL661 ORD → EWR Jul 25, 20:55 UTCJul 25, 22:00 UTC1h 5m
2026-07-25 UAL2743 HNL → SFO Jul 25, 14:10 UTCJul 25, 19:00 UTC4h 50m
2026-07-24 UAL2641 SFO → SAN Jul 24, 22:35 UTCJul 25, 03:45 UTC5h 10m
2026-07-24 UAL419 BNA → EWR Jul 24, 13:29 UTCJul 24, 18:29 UTC5h 0m
2026-07-24 UAL419 BNA → EWR Jul 24, 13:45 UTCJul 24, 18:30 UTC4h 45m
2026-07-24 UAL1558 SNA → IAH Jul 24, 02:10 UTCJul 24, 07:35 UTC5h 25m
2026-07-17 UAL1597 SFO → EWR Jul 17, 20:00 UTCJul 18, 00:55 UTC4h 55m
2026-07-17 UAL1777 EWR → SFO Jul 17, 12:45 UTCJul 17, 18:00 UTC5h 15m
2026-07-17 UAL327 - Jul 17, 04:44 UTCJul 17, 09:30 UTC4h 45m
2026-07-16 UAL210 - Jul 16, 22:05 UTCJul 17, 03:05 UTC5h 0m
2026-07-16 UAL2743 - Jul 16, 14:15 UTCJul 16, 19:10 UTC4h 55m
2026-07-15 UAL2191 - Jul 15, 18:45 UTCJul 15, 23:45 UTC5h 0m
2026-07-15 UAL37 EDI → EWR Jul 15, 08:45 UTCJul 15, 15:40 UTC6h 55m
2026-07-15 UAL36 EWR → EDI Jul 15, 00:38 UTCJul 15, 06:41 UTC6h 3m
2026-07-15 UAL36 - Jul 15, 00:15 UTCJul 15, 00:20 UTC5m
2026-07-14 UAL2743 - Jul 14, 14:15 UTCJul 14, 19:25 UTC5h 10m
2026-07-13 UAL2191 - Jul 13, 20:00 UTCJul 14, 00:40 UTC4h 40m
2026-07-13 UAL139 KEF → EWR Jul 13, 11:25 UTCJul 13, 17:05 UTC5h 40m
2026-07-13 UAL138 - Jul 13, 01:35 UTCJul 13, 06:45 UTC5h 10m
2026-07-12 UAL2127 - Jul 12, 17:40 UTCJul 12, 22:40 UTC5h 0m
2026-07-12 UAL2434 - Jul 12, 10:15 UTCJul 12, 15:05 UTC4h 50m
2026-07-11 UAL2626 SFO → EWR Jul 11, 23:50 UTCJul 12, 04:45 UTC4h 55m
2026-07-11 UAL648 EWR → SFO Jul 11, 15:02 UTCJul 11, 20:23 UTC5h 21m
2026-07-11 UAL648 - Jul 11, 15:00 UTCJul 11, 20:25 UTC5h 25m
2026-07-11 UAL698 SFO → EWR Jul 11, 04:50 UTCJul 11, 09:35 UTC4h 45m
2026-07-11 UAL698 SFO → EWR Jul 11, 04:40 UTCJul 11, 09:29 UTC4h 49m
2026-07-10 UAL2080 - Jul 10, 20:40 UTCJul 11, 02:25 UTC5h 45m
2026-07-10 UAL139 KEF → EWR Jul 10, 11:10 UTCJul 10, 16:45 UTC5h 35m
2026-07-10 UAL398 IAD → KEF Jul 10, 03:20 UTCJul 10, 08:30 UTC5h 10m
2026-07-09 UAL979 EDI → IAD Jul 9, 11:50 UTCJul 9, 19:35 UTC7h 45m
2026-07-09 UAL979 EDI → IAD Jul 9, 11:45 UTCJul 9, 19:34 UTC7h 49m
2026-07-09 UAL978 IAD → EDI Jul 9, 02:55 UTCJul 9, 09:33 UTC6h 38m
2026-07-09 UAL978 IAD → EDI Jul 9, 02:55 UTCJul 9, 09:40 UTC6h 45m
2026-07-08 UAL2277 - Jul 8, 14:20 UTCJul 8, 15:45 UTC1h 25m
2026-07-07 UAL2788 EWR → ORD Jul 7, 19:10 UTCJul 7, 21:10 UTC2h 0m
2026-07-07 UAL37 - Jul 7, 08:55 UTCJul 7, 09:55 UTC1h 0m
2026-07-07 UAL37 EDI → EWR Jul 7, 08:54 UTCJul 7, 16:03 UTC7h 9m
2026-07-07 UAL37 EDI → EWR Jul 7, 08:54 UTCJul 7, 15:57 UTC7h 3m
2026-07-07 UAL118 ORD → EDI Jul 7, 00:15 UTCJul 7, 07:10 UTC6h 55m
2026-07-06 UAL2788 EWR → ORD Jul 6, 19:15 UTCJul 6, 21:05 UTC1h 50m
2026-07-06 UAL2788 EWR → ORD Jul 6, 19:08 UTCJul 6, 21:06 UTC1h 58m
2026-07-06 UAL239 OPO → EWR Jul 6, 08:25 UTCJul 6, 15:40 UTC7h 15m
2026-07-05 UAL238 - Jul 5, 23:20 UTCJul 6, 05:40 UTC6h 20m
2026-07-05 UAL1403 - Jul 5, 13:15 UTCJul 5, 18:10 UTC4h 55m
2026-07-05 UAL1403 LAX → EWR Jul 5, 13:18 UTCJul 5, 18:11 UTC4h 53m

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 N17133 page for operator, model, and routing details .

Mode-S A11FC1 frequently asked

What is Mode-S code A11FC1?
A11FC1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17133.
Where is Mode-S A11FC1 registered?
Mode-S code A11FC1 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 A11FC1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11FC1, octal 50217701, decimal 10,559,425.
What flights does A11FC1 operate?
Mode-S A11FC1 has broadcast 20 distinct callsigns, including UAL2788, UAL37, UAL229, UAL145, UAL2191.