Apparatus

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sensors Mode-S transponder

A12F71

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17595 · BOEING 737 MAX 9 · operated by BANK OF UTAH TRUSTEE

Hex
A12F71
Octal
50227561
Decimal
10,563,441
Country
US
Tail
N17595
Type
B39M
No current signal · last broadcast Jul 26, 20:55 UTC
Flights observed
440
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:55 UTC

Last known position

Most recent position reported by Mode-S A12F71.

Country allocation

The ICAO 24-bit address A12F71 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
UAL1016 United Airlines 7 2026-07-23
UAL727 United Airlines 6 2026-06-01
UAL2038 - 5 2026-07-22
UAL1792 United Airlines 5 2026-04-15
UAL1723 - 5 2026-06-25
UAL1250 - 5 2026-07-07
UAL1192 United Airlines 5 2026-06-17
UAL1039 United Airlines 5 2026-05-30
UAL1031 - 5 2026-07-08
UAL733 United Airlines 4 2026-05-21
UAL2738 United Airlines 4 2026-04-21
UAL2601 United Airlines 4 2026-04-21
UAL2024 - 4 2026-06-17
UAL2001 - 4 2026-06-25
UAL1984 United Airlines 4 2026-06-04
UAL1058 - 4 2026-06-20
UAL1019 United Airlines 4 2026-07-23
UAL700 United Airlines 3 2026-06-14
UAL620 United Airlines 3 2026-06-26
UAL602 United Airlines 3 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1017 ORD → BUF Jul 26, 19:05 UTCJul 26, 20:55 UTC1h 50m
2026-07-26 UAL1050 MCO → EWR Jul 26, 13:55 UTCJul 26, 17:05 UTC3h 10m
2026-07-26 UAL2147 MIA → EWR Jul 26, 10:50 UTCJul 26, 11:35 UTC45m
2026-07-26 UAL2382 IAH → PHL Jul 26, 00:00 UTCJul 26, 02:15 UTC2h 15m
2026-07-25 UAL2382 IAH → PHL Jul 25, 20:45 UTCJul 25, 22:55 UTC2h 10m
2026-07-25 UAL1799 MIA → EWR Jul 25, 16:05 UTCJul 25, 18:35 UTC2h 30m
2026-07-25 UAL1799 MIA → EWR Jul 25, 16:19 UTCJul 25, 18:31 UTC2h 12m
2026-07-25 UAL1229 EWR → MCI Jul 25, 10:20 UTCJul 25, 12:35 UTC2h 15m
2026-07-25 UAL2237 ORD → EWR Jul 25, 01:05 UTCJul 25, 03:20 UTC2h 15m
2026-07-25 UAL2237 ORD → EWR Jul 25, 01:08 UTCJul 25, 03:22 UTC2h 14m
2026-07-24 UAL1468 SAL → IAH Jul 24, 20:10 UTCJul 24, 22:50 UTC2h 40m
2026-07-24 UAL1441 IAH → SAL Jul 24, 17:40 UTCJul 24, 18:00 UTC20m
2026-07-24 UAL1441 IAH → SAL Jul 24, 15:40 UTCJul 24, 16:10 UTC30m
2026-07-24 UAL1229 EWR → MCI Jul 24, 10:30 UTCJul 24, 12:50 UTC2h 20m
2026-07-24 UAL1229 EWR → MCI Jul 24, 10:28 UTCJul 24, 12:47 UTC2h 19m
2026-07-24 UAL2237 ORD → EWR Jul 24, 01:15 UTCJul 24, 03:35 UTC2h 20m
2026-07-23 UAL1019 CUN → IAH Jul 23, 20:40 UTCJul 23, 22:35 UTC1h 55m
2026-07-23 UAL1016 IAH → CUN Jul 23, 17:10 UTCJul 23, 19:15 UTC2h 5m
2026-07-23 UAL1016 IAH → CUN Jul 23, 17:12 UTCJul 23, 19:11 UTC1h 59m
2026-07-23 UAL2417 - Jul 23, 13:10 UTCJul 23, 15:20 UTC2h 10m
2026-07-23 UAL2417 MIA → IAH Jul 23, 13:04 UTCJul 23, 15:17 UTC2h 13m
2026-07-22 UAL2740 EWR → SFO Jul 22, 22:15 UTCJul 23, 00:30 UTC2h 15m
2026-07-22 UAL2038 - Jul 22, 17:50 UTCJul 22, 20:40 UTC2h 50m
2026-07-22 UAL2642 IAH → PHX Jul 22, 12:50 UTCJul 22, 15:45 UTC2h 55m
2026-07-22 UAL2204 SFO → SNA Jul 22, 00:35 UTCJul 22, 03:40 UTC3h 5m
2026-07-20 UAL1489 EWR → STI Jul 20, 23:40 UTCJul 21, 12:55 UTC13h 15m
2026-07-20 UAL1480 EWR → NAS Jul 20, 14:30 UTCJul 20, 21:30 UTC7h 0m
2026-07-20 UAL2158 - Jul 20, 10:20 UTCJul 20, 12:35 UTC2h 15m
2026-07-20 UAL2650 - Jul 20, 02:35 UTCJul 20, 05:00 UTC2h 25m
2026-07-19 UAL2608 - Jul 19, 23:40 UTCJul 20, 00:15 UTC35m
2026-07-19 UAL2608 - Jul 19, 20:15 UTCJul 20, 00:15 UTC4h 0m
2026-07-19 UAL2608 IAH → EWR Jul 19, 20:09 UTCJul 19, 23:23 UTC3h 14m
2026-07-19 UAL1416 LAX → SFO Jul 19, 15:45 UTCJul 19, 18:35 UTC2h 50m
2026-07-19 UAL1670 SAL → LAX Jul 19, 08:10 UTCJul 19, 12:51 UTC4h 41m
2026-07-19 UAL1461 - Jul 19, 00:05 UTCJul 19, 02:20 UTC2h 15m
2026-07-18 UAL1976 BOS → IAH Jul 18, 18:50 UTCJul 18, 22:25 UTC3h 35m
2026-07-18 UAL1977 - Jul 18, 12:50 UTCJul 18, 16:15 UTC3h 25m
2026-07-18 UAL1966 - Jul 18, 10:30 UTCJul 18, 10:55 UTC25m
2026-07-18 UAL312T ORD → AUS Jul 18, 02:50 UTCJul 18, 04:55 UTC2h 5m
2026-07-17 UAL1475 BOS → ORD Jul 17, 22:15 UTCJul 18, 00:55 UTC2h 40m
2026-07-17 UAL1606 SFO → ORD Jul 17, 16:10 UTCJul 17, 18:00 UTC1h 50m
2026-07-17 UAL1606 SFO → ORD Jul 17, 16:01 UTCJul 17, 17:57 UTC1h 56m
2026-07-17 UAL1150 MCO → ORD Jul 17, 11:20 UTCJul 17, 13:40 UTC2h 20m
2026-07-17 UAL1150 MCO → ORD Jul 17, 11:24 UTCJul 17, 13:37 UTC2h 13m
2026-07-16 UAL520 - Jul 16, 21:45 UTCJul 17, 02:45 UTC5h 0m
2026-07-16 UAL2002 BOS → SFO Jul 16, 14:29 UTCJul 16, 20:09 UTC5h 40m
2026-07-16 UAL1665 SFO → BOS Jul 16, 07:00 UTCJul 16, 12:00 UTC5h 0m
2026-07-16 UAL1665 SFO → BOS Jul 16, 06:38 UTCJul 16, 11:56 UTC5h 18m
2026-07-15 UAL1118 CUN → SFO Jul 15, 22:20 UTCJul 16, 03:40 UTC5h 20m
2026-07-15 UAL1618 IAD → CUN Jul 15, 17:25 UTCJul 15, 20:10 UTC2h 45m

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 N17595 page for operator, model, and routing details .

Mode-S A12F71 frequently asked

What is Mode-S code A12F71?
A12F71 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17595.
Where is Mode-S A12F71 registered?
Mode-S code A12F71 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 A12F71 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12F71, octal 50227561, decimal 10,563,441.
What flights does A12F71 operate?
Mode-S A12F71 has broadcast 20 distinct callsigns, including UAL1016, UAL727, UAL2038, UAL1792, UAL1723.