Apparatus

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sensors Mode-S transponder

A11FC7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17139 · BOEING 757-200 · operated by UNITED AIRLINES INC

Hex
A11FC7
Octal
50217707
Decimal
10,559,431
Country
US
Tail
N17139
Type
B752
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
255
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A11FC7.

Country allocation

The ICAO 24-bit address A11FC7 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
UAL978 United Airlines 12 2026-06-01
UAL979 United Airlines 10 2026-06-01
UAL2679 - 9 2026-07-20
UAL229 - 9 2026-06-22
UAL311 United Airlines 8 2026-05-31
UAL228 - 7 2026-06-22
UAL145 - 7 2026-07-13
UAL912 United Airlines 6 2026-07-23
UAL648 - 6 2026-06-28
UAL36 United Airlines 6 2026-07-22
UAL310 United Airlines 6 2026-05-31
UAL144 - 6 2026-07-13
UAL913 United Airlines 5 2026-07-23
UAL560 United Airlines 5 2026-04-19
UAL419 - 5 2026-07-14
UAL1700 United Airlines 5 2026-07-20
UAL886 United Airlines 4 2026-06-12
UAL37 United Airlines 4 2026-04-25
UAL354 United Airlines 4 2026-04-24
UAL336T United Airlines 4 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1597 LAX → SFO Jul 26, 20:55 UTCJul 26, 21:45 UTC50m
2026-07-26 UAL1777 EWR → IAH Jul 26, 13:25 UTCJul 26, 18:45 UTC5h 20m
2026-07-25 UAL2171 GRR → DEN Jul 25, 22:55 UTCJul 26, 00:30 UTC1h 35m
2026-07-23 UAL913 HNL → SFO Jul 23, 12:10 UTCJul 23, 18:25 UTC6h 15m
2026-07-23 UAL912 KEF → ORD Jul 23, 04:03 UTCJul 23, 09:31 UTC5h 28m
2026-07-23 UAL912 KEF → ORD Jul 23, 03:55 UTCJul 23, 04:35 UTC40m
2026-07-22 UAL119 ORD → EDI Jul 22, 11:10 UTCJul 22, 11:45 UTC35m
2026-07-22 UAL119 ORD → EDI Jul 22, 11:13 UTCJul 22, 19:11 UTC7h 58m
2026-07-22 UAL36 EWR → EDI Jul 22, 04:25 UTCJul 22, 04:45 UTC20m
2026-07-22 UAL36 EWR → EDI Jul 22, 03:05 UTCJul 22, 04:20 UTC1h 15m
2026-07-21 UAL2127 LGA → ORD Jul 21, 19:20 UTCJul 22, 00:30 UTC5h 10m
2026-07-21 UAL2434 EWR → LAX Jul 21, 11:00 UTCJul 21, 15:45 UTC4h 45m
2026-07-21 UAL2434 EWR → LAX Jul 21, 10:34 UTCJul 21, 15:47 UTC5h 13m
2026-07-20 UAL1700 IAH → EWR Jul 20, 23:20 UTCJul 21, 04:10 UTC4h 49m
2026-07-20 UAL1700 IAH → EWR Jul 20, 23:26 UTCJul 21, 04:08 UTC4h 42m
2026-07-20 UAL2679 - Jul 20, 15:15 UTCJul 20, 20:05 UTC4h 50m
2026-07-19 UAL1149 SFO → EWR Jul 19, 14:30 UTCJul 19, 19:40 UTC5h 10m
2026-07-19 UAL8140 - Jul 19, 01:05 UTCJul 19, 06:20 UTC5h 15m
2026-07-19 UAL8140 - Jul 19, 00:50 UTCJul 19, 01:00 UTC10m
2026-07-19 UAL8140 EWR → SFO Jul 19, 00:35 UTCJul 19, 06:18 UTC5h 43m
2026-07-18 UAL1403 - Jul 18, 13:35 UTCJul 18, 18:45 UTC5h 10m
2026-07-17 UAL2641 - Jul 17, 22:10 UTCJul 18, 03:25 UTC5h 16m
2026-07-17 UAL316 - Jul 17, 12:55 UTCJul 17, 19:40 UTC6h 45m
2026-07-17 UAL317 IAH → PHL Jul 17, 03:50 UTCJul 17, 10:00 UTC6h 10m
2026-07-16 UAL1597 SFO → EWR Jul 16, 20:35 UTCJul 17, 01:45 UTC5h 10m
2026-07-16 UAL1777 EWR → SFO Jul 16, 12:30 UTCJul 16, 17:54 UTC5h 25m
2026-07-16 UAL327 - Jul 16, 05:10 UTCJul 16, 09:50 UTC4h 40m
2026-07-15 UAL210 - Jul 15, 22:55 UTCJul 16, 03:40 UTC4h 45m
2026-07-15 UAL239 OPO → EWR Jul 15, 08:20 UTCJul 15, 15:02 UTC6h 42m
2026-07-15 UAL239 OPO → EWR Jul 15, 07:55 UTCJul 15, 15:05 UTC7h 10m
2026-07-14 UAL238 - Jul 14, 22:40 UTCJul 15, 00:15 UTC1h 34m
2026-07-14 UAL238 EWR → OPO Jul 14, 22:38 UTCJul 15, 05:01 UTC6h 23m
2026-07-14 UAL419 SFO → EWR Jul 14, 14:05 UTCJul 14, 19:00 UTC4h 55m
2026-07-13 UAL1340 - Jul 13, 23:05 UTCJul 14, 04:00 UTC4h 55m
2026-07-13 UAL145 OPO → EWR Jul 13, 12:00 UTCJul 13, 19:10 UTC7h 10m
2026-07-13 UAL145 OPO → EWR Jul 13, 12:10 UTCJul 13, 19:05 UTC6h 55m
2026-07-13 UAL144 - Jul 13, 02:30 UTCJul 13, 08:45 UTC6h 15m
2026-07-12 UAL2227 - Jul 12, 19:30 UTCJul 13, 00:40 UTC5h 10m
2026-07-11 UAL2641 - Jul 11, 23:00 UTCJul 12, 03:55 UTC4h 55m
2026-07-11 UAL145 OPO → EWR Jul 11, 12:00 UTCJul 11, 19:01 UTC7h 1m
2026-07-11 UAL145 OPO → EWR Jul 11, 11:50 UTCJul 11, 19:00 UTC7h 10m
2026-07-11 UAL144 - Jul 11, 02:35 UTCJul 11, 08:40 UTC6h 5m
2026-07-10 UAL239 OPO → EWR Jul 10, 09:15 UTCJul 10, 16:30 UTC7h 15m
2026-07-10 UAL238 EWR → OPO Jul 10, 01:10 UTCJul 10, 07:25 UTC6h 15m
2026-07-08 UAL1597 SFO → EWR Jul 8, 19:50 UTCJul 9, 00:40 UTC4h 50m
2026-07-08 UAL1777 - Jul 8, 12:40 UTCJul 8, 18:05 UTC5h 25m
2026-07-08 UAL327 SAN → EWR Jul 8, 04:30 UTCJul 8, 09:25 UTC4h 55m
2026-07-07 UAL210 - Jul 7, 21:30 UTCJul 8, 02:40 UTC5h 10m
2026-07-06 UAL1403 - Jul 6, 13:10 UTCJul 6, 18:00 UTC4h 50m
2026-07-05 UAL2679 DEN → ORD Jul 5, 17:20 UTCJul 5, 22:25 UTC5h 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 N17139 page for operator, model, and routing details .

Mode-S A11FC7 frequently asked

What is Mode-S code A11FC7?
A11FC7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17139.
Where is Mode-S A11FC7 registered?
Mode-S code A11FC7 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 A11FC7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11FC7, octal 50217707, decimal 10,559,431.
What flights does A11FC7 operate?
Mode-S A11FC7 has broadcast 20 distinct callsigns, including UAL978, UAL979, UAL2679, UAL229, UAL311.