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
Broadcasting now · callsign UAL1343 · 20,800 ft
Flights observed
99
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A11FC1 is currently broadcasting. Map zoomed to live position.

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
UAL145 United Airlines 5 2026-05-24
UAL351 United Airlines 4 2026-05-25
UAL350 United Airlines 4 2026-05-25
UAL2679 United Airlines 4 2026-06-03
UAL1759 United Airlines 4 2026-05-12
UAL144 United Airlines 4 2026-05-24
UAL712 United Airlines 3 2026-05-07
UAL2359 United Airlines 3 2026-05-07
UAL1758 United Airlines 3 2026-05-11
UAL1197 United Airlines 3 2026-05-09
UAL119 United Airlines 3 2026-05-29
UAL118 United Airlines 3 2026-05-29
UAL698 United Airlines 2 2026-06-03
UAL419 United Airlines 2 2026-06-02
UAL332 United Airlines 2 2026-05-05
UAL2788 United Airlines 2 2026-05-27
UAL2416 United Airlines 2 2026-05-16
UAL2308 United Airlines 2 2026-04-24
UAL2307 United Airlines 2 2026-04-23
UAL2301 United Airlines 2 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-05 UAL1343 EWR → TPA Jun 5, 16:15 UTCJun 5, 20:15 UTC4h 0m
2026-06-05 UAL2626 SFO → IAD Jun 5, 00:05 UTCJun 5, 05:15 UTC5h 10m
2026-06-04 UAL1343 EWR → TPA Jun 4, 16:30 UTCJun 4, 22:00 UTC5h 30m
2026-06-03 UAL1700 IAH → EWR Jun 3, 23:55 UTCJun 4, 04:45 UTC4h 50m
2026-06-03 UAL1700 IAH → EWR Jun 3, 23:54 UTCJun 4, 04:44 UTC4h 50m
2026-06-03 UAL2679 DEN → ORD Jun 3, 14:40 UTCJun 3, 19:40 UTC5h 0m
2026-06-03 UAL698 DFW → EWR Jun 3, 04:25 UTCJun 3, 09:20 UTC4h 55m
2026-06-02 UAL2080 ORD → SFO Jun 2, 20:20 UTCJun 3, 01:50 UTC5h 30m
2026-06-02 UAL419 BNA → EWR Jun 2, 13:20 UTCJun 2, 18:20 UTC5h 0m
2026-06-02 UAL1340 FLL → EWR Jun 2, 01:00 UTCJun 2, 06:45 UTC5h 45m
2026-06-01 UAL2743 HNL → SFO Jun 1, 14:20 UTCJun 1, 18:55 UTC4h 35m
2026-05-30 UAL2191 EUG → SFO May 30, 18:35 UTCMay 31, 00:00 UTC5h 25m
2026-05-30 UAL2301 PHL → ORD May 30, 14:05 UTCMay 30, 15:45 UTC1h 40m
2026-05-29 UAL119 ORD → EDI May 29, 10:35 UTCMay 29, 18:05 UTC7h 31m
2026-05-29 UAL118 ORD → EDI May 29, 00:05 UTCMay 29, 07:35 UTC7h 30m
2026-05-28 UAL119 ORD → EDI May 28, 10:35 UTCMay 28, 11:05 UTC30m
2026-05-28 UAL119 ORD → EDI May 28, 10:43 UTCMay 28, 18:02 UTC7h 19m
2026-05-28 UAL118 ORD → EDI May 28, 00:22 UTCMay 28, 07:32 UTC7h 10m
2026-05-28 UAL118 ORD → EDI May 28, 00:10 UTCMay 28, 07:40 UTC7h 30m
2026-05-27 UAL2788 DEN → EWR May 27, 19:15 UTCMay 27, 21:20 UTC2h 5m
2026-05-27 UAL239 ORD → BNA May 27, 08:20 UTCMay 27, 15:15 UTC6h 55m
2026-05-26 UAL238 CLE → ORD May 26, 22:35 UTCMay 27, 05:04 UTC6h 30m
2026-05-26 UAL1149 EWR → SRQ May 26, 14:14 UTCMay 26, 19:15 UTC5h 0m
2026-05-25 UAL2328 ORD → SFO May 25, 19:15 UTCMay 26, 00:54 UTC5h 40m
2026-05-25 UAL351 DCA → SFO May 25, 07:45 UTCMay 25, 15:40 UTC7h 55m
2026-05-25 UAL350 DEN → EWR May 25, 04:10 UTCMay 25, 05:15 UTC1h 5m
2026-05-24 UAL145 OPO → EWR May 24, 12:10 UTCMay 24, 19:33 UTC7h 23m
2026-05-24 UAL145 OPO → EWR May 24, 12:05 UTCMay 24, 19:25 UTC7h 20m
2026-05-24 UAL144 EWR → OPO May 24, 03:35 UTCMay 24, 09:55 UTC6h 20m
2026-05-24 UAL144 EWR → OPO May 24, 03:10 UTCMay 24, 09:50 UTC6h 40m
2026-05-23 UAL2127 LGA → ORD May 23, 19:10 UTCMay 23, 23:55 UTC4h 45m
2026-05-22 UAL2641 SFO → SAN May 22, 22:25 UTCMay 23, 03:40 UTC5h 14m
2026-05-22 UAL2301 PHL → ORD May 22, 15:40 UTCMay 22, 17:15 UTC1h 35m
2026-05-21 UAL2788 DEN → EWR May 21, 20:35 UTCMay 21, 22:50 UTC2h 15m
2026-05-17 UAL1981 DEN → LGA May 17, 18:35 UTCMay 17, 23:30 UTC4h 55m
2026-05-17 UAL1981 DEN → LGA May 17, 18:35 UTCMay 17, 23:28 UTC4h 53m
2026-05-16 UAL2679 DEN → ORD May 16, 14:11 UTCMay 16, 19:35 UTC5h 25m
2026-05-16 UAL2416 LAS → SFO May 16, 07:31 UTCMay 16, 12:25 UTC4h 55m
2026-05-16 UAL1844 EWR → MIA May 16, 00:00 UTCMay 16, 05:46 UTC5h 46m
2026-05-15 UAL145 OPO → EWR May 15, 11:45 UTCMay 15, 19:30 UTC7h 44m
2026-05-15 UAL144 EWR → OPO May 15, 02:10 UTCMay 15, 08:40 UTC6h 30m
2026-05-14 UAL2190 EWR → MSP May 14, 20:10 UTCMay 14, 23:10 UTC3h 0m
2026-05-14 UAL2190 EWR → MSP May 14, 20:15 UTCMay 14, 23:08 UTC2h 53m
2026-05-14 UAL2467 IAD → ORD May 14, 15:20 UTCMay 14, 18:30 UTC3h 10m
2026-05-14 UAL887 LIM → EWR May 14, 05:45 UTCMay 14, 12:40 UTC6h 55m
2026-05-13 UAL886 EWR → LIM May 13, 20:15 UTCMay 14, 03:15 UTC7h 0m
2026-05-13 UAL351 DCA → SFO May 13, 07:45 UTCMay 13, 16:00 UTC8h 15m
2026-05-12 UAL350 DEN → EWR May 12, 22:15 UTCMay 13, 05:10 UTC6h 55m
2026-05-12 UAL350 DEN → EWR May 12, 22:25 UTCMay 13, 05:10 UTC6h 45m
2026-05-12 UAL2381 MSY → IAD May 12, 16:30 UTCMay 12, 19:35 UTC3h 5m

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?
Yes. Mode-S A11FC1 is currently airborne.
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 UAL145, UAL351, UAL350, UAL2679, UAL1759.