Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A11F9D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17122 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A11F9D
Octal
50217635
Decimal
10,559,389
Country
US
Tail
N17122
Type
B752
No current signal · last broadcast 1h ago
Flights observed
135
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A11F9D.

Country allocation

The ICAO 24-bit address A11F9D 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
UAL119 United Airlines 8 2026-06-12
UAL2445 United Airlines 7 2026-06-03
UAL118 United Airlines 7 2026-06-11
UAL698 United Airlines 5 2026-05-19
UAL399 - 4 2026-06-15
UAL37 United Airlines 4 2026-05-21
UAL36 United Airlines 4 2026-05-21
UAL316 United Airlines 4 2026-05-23
UAL270 United Airlines 4 2026-05-10
UAL2434 United Airlines 4 2026-05-30
UAL2308 United Airlines 4 2026-05-26
UAL2127 United Airlines 4 2026-05-30
UAL2080 United Airlines 4 2026-05-18
UAL1939 United Airlines 4 2026-05-19
UAL398 United Airlines 3 2026-06-16
UAL289 United Airlines 3 2026-06-08
UAL2788 United Airlines 3 2026-06-05
UAL271 United Airlines 3 2026-05-10
UAL912 - 2 2026-06-14
UAL712 United Airlines 2 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 UAL913 - Jun 16, 12:05 UTCJun 16, 17:15 UTC5h 10m
2026-06-16 UAL398 EWR → TPA Jun 16, 07:55 UTCJun 16, 08:20 UTC25m
2026-06-16 UAL398 EWR → TPA Jun 16, 02:54 UTCJun 16, 04:39 UTC1h 45m
2026-06-15 UAL399 KEF → IAD Jun 15, 11:49 UTCJun 15, 17:27 UTC5h 38m
2026-06-15 UAL399 KEF → IAD Jun 15, 11:39 UTCJun 15, 17:30 UTC5h 50m
2026-06-15 UAL398 EWR → TPA Jun 15, 04:25 UTCJun 15, 09:40 UTC5h 15m
2026-06-14 UAL399 CLE → EWR Jun 14, 16:10 UTCJun 14, 18:05 UTC1h 55m
2026-06-14 UAL399 CLE → EWR Jun 14, 12:10 UTCJun 14, 12:20 UTC10m
2026-06-14 UAL912 - Jun 14, 04:55 UTCJun 14, 06:05 UTC1h 10m
2026-06-14 UAL912 ORD → KEF Jun 14, 04:08 UTCJun 14, 10:31 UTC6h 23m
2026-06-12 UAL119 ORD → EDI Jun 12, 12:55 UTCJun 12, 20:35 UTC7h 40m
2026-06-11 UAL118 ORD → EDI Jun 11, 00:10 UTCJun 11, 07:20 UTC7h 10m
2026-06-10 UAL119 ORD → EDI Jun 10, 10:55 UTCJun 10, 18:45 UTC7h 50m
2026-06-10 UAL118 ORD → EDI Jun 10, 01:10 UTCJun 10, 01:50 UTC40m
2026-06-10 UAL118 ORD → EDI Jun 10, 00:22 UTCJun 10, 08:04 UTC7h 42m
2026-06-09 UAL119 ORD → EDI Jun 9, 10:35 UTCJun 9, 11:00 UTC25m
2026-06-09 UAL119 ORD → EDI Jun 9, 10:43 UTCJun 9, 18:22 UTC7h 39m
2026-06-09 UAL118 ORD → EDI Jun 9, 00:40 UTCJun 9, 07:45 UTC7h 5m
2026-06-08 UAL289 EWR → RDU Jun 8, 08:45 UTCJun 8, 16:20 UTC7h 35m
2026-06-08 UAL288 DCA → ORD Jun 8, 00:05 UTCJun 8, 06:55 UTC6h 50m
2026-06-07 UAL119 ORD → EDI Jun 7, 11:10 UTCJun 7, 18:45 UTC7h 35m
2026-06-07 UAL118 ORD → EDI Jun 7, 00:19 UTCJun 7, 07:25 UTC7h 5m
2026-06-06 UAL119 ORD → EDI Jun 6, 18:14 UTCJun 6, 18:25 UTC10m
2026-06-06 UAL119 ORD → EDI Jun 6, 10:39 UTCJun 6, 12:30 UTC1h 50m
2026-06-06 UAL119 ORD → EDI Jun 6, 10:43 UTCJun 6, 17:57 UTC7h 14m
2026-06-06 UAL118 ORD → EDI Jun 6, 00:24 UTCJun 6, 07:01 UTC6h 37m
2026-06-06 UAL118 ORD → EDI Jun 6, 00:05 UTCJun 6, 02:25 UTC2h 20m
2026-06-05 UAL2788 DEN → EWR Jun 5, 19:10 UTCJun 5, 20:55 UTC1h 45m
2026-06-05 UAL239 ORD → BNA Jun 5, 08:20 UTCJun 5, 16:10 UTC7h 50m
2026-06-04 UAL238 CLE → ORD Jun 4, 23:00 UTCJun 5, 05:10 UTC6h 10m
2026-06-04 UAL282 AUS → EWR Jun 4, 10:55 UTCJun 4, 18:35 UTC7h 40m
2026-06-04 UAL281 BNA → IAH Jun 4, 01:50 UTCJun 4, 08:05 UTC6h 15m
2026-06-03 UAL1970 SFO → LAS Jun 3, 18:30 UTCJun 3, 23:30 UTC5h 0m
2026-06-03 UAL2445 GSP → ORD Jun 3, 12:25 UTCJun 3, 17:10 UTC4h 45m
2026-06-02 UAL2812 ORD → EWR Jun 2, 21:45 UTCJun 2, 23:35 UTC1h 50m
2026-06-02 UAL289 EWR → RDU Jun 2, 08:47 UTCJun 2, 15:40 UTC6h 53m
2026-06-02 UAL289 EWR → RDU Jun 2, 08:30 UTCJun 2, 15:50 UTC7h 20m
2026-06-01 UAL288 DCA → ORD Jun 1, 23:25 UTCJun 2, 06:15 UTC6h 50m
2026-06-01 UAL2788 DEN → EWR Jun 1, 19:13 UTCJun 1, 20:52 UTC1h 39m
2026-06-01 UAL2788 DEN → EWR Jun 1, 19:10 UTCJun 1, 21:05 UTC1h 55m
2026-06-01 UAL239 ORD → BNA Jun 1, 08:35 UTCJun 1, 16:25 UTC7h 50m
2026-05-31 UAL238 CLE → ORD May 31, 23:15 UTCJun 1, 05:10 UTC5h 55m
2026-05-31 UAL145 OPO → EWR May 31, 11:55 UTCMay 31, 19:15 UTC7h 20m
2026-05-31 UAL144 EWR → OPO May 31, 03:10 UTCMay 31, 09:15 UTC6h 5m
2026-05-30 UAL2127 LGA → ORD May 30, 17:30 UTCMay 30, 22:25 UTC4h 55m
2026-05-30 UAL2434 EWR → LAX May 30, 10:15 UTCMay 30, 15:40 UTC5h 25m
2026-05-29 UAL2743 HNL → SFO May 29, 14:10 UTCMay 29, 19:05 UTC4h 55m
2026-05-28 UAL712 ORD → DEL May 28, 00:33 UTCMay 28, 05:44 UTC5h 11m
2026-05-28 UAL712 ORD → DEL May 28, 00:20 UTCMay 28, 05:50 UTC5h 30m
2026-05-27 UAL1283 EWR → ATL May 27, 19:35 UTCMay 27, 22:50 UTC3h 15m

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 N17122 page for operator, model, and routing details .

Mode-S A11F9D frequently asked

What is Mode-S code A11F9D?
A11F9D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17122.
Where is Mode-S A11F9D registered?
Mode-S code A11F9D 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 A11F9D broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11F9D, octal 50217635, decimal 10,559,389.
What flights does A11F9D operate?
Mode-S A11F9D has broadcast 20 distinct callsigns, including UAL119, UAL2445, UAL118, UAL698, UAL399.