Apparatus

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sensors Mode-S transponder

A12712

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17329 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A12712
Octal
50223422
Decimal
10,561,298
Country
US
Tail
N17329
Type
B38M
No current signal · last broadcast Jul 26, 22:05 UTC
Flights observed
453
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:05 UTC

Last known position

Most recent position reported by Mode-S A12712.

Country allocation

The ICAO 24-bit address A12712 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
UAL1632 - 9 2026-07-02
UAL643 - 7 2026-06-29
UAL2423 United Airlines 7 2026-07-26
UAL1138 - 7 2026-07-03
UAL765 United Airlines 6 2026-07-23
UAL474 - 6 2026-06-26
UAL2641 United Airlines 6 2026-07-23
UAL627 United Airlines 5 2026-07-24
UAL269 - 5 2026-06-30
UAL1985 United Airlines 5 2026-05-22
UAL628 - 4 2026-06-28
UAL450 - 4 2026-07-13
UAL278 United Airlines 4 2026-06-12
UAL2651 - 4 2026-06-29
UAL2426 United Airlines 4 2026-07-26
UAL2392 United Airlines 4 2026-05-22
UAL209 - 4 2026-06-30
UAL1986 United Airlines 4 2026-05-16
UAL1671 United Airlines 4 2026-04-24
UAL776 United Airlines 3 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2426 IAH → BOS Jul 26, 18:10 UTCJul 26, 21:45 UTC3h 35m
2026-07-26 UAL2423 YVR → SFO Jul 26, 11:00 UTCJul 26, 16:05 UTC5h 5m
2026-07-25 UAL1699 SLC → SFO Jul 25, 16:20 UTCJul 26, 02:35 UTC10h 15m
2026-07-25 UAL1607 IND → DEN Jul 25, 12:10 UTCJul 25, 14:30 UTC2h 20m
2026-07-25 UAL2477 EWR → SMF Jul 25, 07:15 UTCJul 25, 10:50 UTC3h 35m
2026-07-25 UAL504 DEN → LGA Jul 25, 00:05 UTCJul 25, 05:35 UTC5h 30m
2026-07-24 UAL1093 LAX → SFO Jul 24, 18:05 UTCJul 24, 22:25 UTC4h 20m
2026-07-24 UAL627 EWR → SAV Jul 24, 05:10 UTCJul 24, 05:55 UTC45m
2026-07-23 UAL765 EWR → DFW Jul 23, 23:25 UTCJul 23, 23:40 UTC15m
2026-07-23 UAL765 EWR → DFW Jul 23, 18:20 UTCJul 23, 18:50 UTC30m
2026-07-23 UAL776 ORD → SJC Jul 23, 11:40 UTCJul 23, 15:55 UTC4h 15m
2026-07-23 UAL2641 SFO → SAN Jul 23, 05:50 UTCJul 23, 10:00 UTC4h 10m
2026-07-22 UAL1349 RSW → IAD Jul 22, 22:00 UTCJul 23, 02:30 UTC4h 30m
2026-07-22 UAL1349 RSW → IAD Jul 22, 22:11 UTCJul 23, 02:27 UTC4h 16m
2026-07-22 UAL2039 LAX → ORD Jul 22, 16:20 UTCJul 22, 20:30 UTC4h 10m
2026-07-22 UAL2096 - Jul 22, 13:20 UTCJul 22, 14:25 UTC1h 5m
2026-07-22 UAL1898 - Jul 22, 02:20 UTCJul 22, 03:15 UTC55m
2026-07-22 UAL1898 LAX → RNO Jul 22, 02:28 UTCJul 22, 03:13 UTC45m
2026-07-21 UAL387 YVR → LAX Jul 21, 22:20 UTCJul 22, 00:51 UTC2h 31m
2026-07-21 UAL387 YVR → LAX Jul 21, 22:25 UTCJul 22, 00:55 UTC2h 30m
2026-07-21 UAL2318 DEN → LAX Jul 21, 18:15 UTCJul 21, 20:30 UTC2h 15m
2026-07-21 UAL776 ORD → SJC Jul 21, 11:55 UTCJul 21, 16:15 UTC4h 20m
2026-07-21 UAL2641 - Jul 21, 05:50 UTCJul 21, 10:15 UTC4h 25m
2026-07-20 UAL418 SAN → SFO Jul 20, 23:18 UTCJul 21, 03:52 UTC4h 34m
2026-07-20 UAL417 - Jul 20, 16:10 UTCJul 20, 16:30 UTC20m
2026-07-20 UAL417 LAX → OGG Jul 20, 16:18 UTCJul 20, 21:29 UTC5h 11m
2026-07-20 UAL627 EWR → SAV Jul 20, 04:50 UTCJul 20, 06:00 UTC1h 10m
2026-07-20 UAL627 EWR → SAV Jul 20, 01:12 UTCJul 20, 05:55 UTC4h 43m
2026-07-19 UAL765 - Jul 19, 18:15 UTCJul 19, 19:15 UTC1h 0m
2026-07-19 UAL627 EWR → SAV Jul 19, 05:00 UTCJul 19, 05:50 UTC50m
2026-07-18 UAL765 - Jul 18, 18:25 UTCJul 18, 18:55 UTC30m
2026-07-18 UAL765 LAX → OGG Jul 18, 18:16 UTCJul 18, 23:35 UTC5h 19m
2026-07-18 UAL776 - Jul 18, 11:20 UTCJul 18, 15:45 UTC4h 25m
2026-07-16 UAL2476 - Jul 16, 20:09 UTCJul 16, 22:40 UTC2h 30m
2026-07-16 UAL2246 - Jul 16, 15:25 UTCJul 16, 17:54 UTC2h 30m
2026-07-16 UAL1833 EWR → CLE Jul 16, 12:54 UTCJul 16, 13:48 UTC54m
2026-07-16 UAL1833 - Jul 16, 12:40 UTCJul 16, 13:49 UTC1h 10m
2026-07-16 UAL1560 - Jul 16, 01:00 UTCJul 16, 01:05 UTC5m
2026-07-15 UAL1560 - Jul 15, 20:10 UTCJul 16, 01:05 UTC4h 55m
2026-07-15 UAL1560 SJO → EWR Jul 15, 19:28 UTCJul 16, 00:43 UTC5h 15m
2026-07-15 UAL1080 - Jul 15, 12:40 UTCJul 15, 17:50 UTC5h 10m
2026-07-15 UAL1681 LAS → EWR Jul 15, 05:50 UTCJul 15, 10:20 UTC4h 30m
2026-07-14 UAL1149 EWR → LAS Jul 14, 21:15 UTCJul 15, 01:40 UTC4h 24m
2026-07-14 UAL1539 - Jul 14, 13:15 UTCJul 14, 19:25 UTC6h 10m
2026-07-14 UAL363 - Jul 14, 04:30 UTCJul 14, 10:45 UTC6h 15m
2026-07-13 UAL450 EWR → ANC Jul 13, 19:50 UTCJul 14, 03:15 UTC7h 25m
2026-07-13 UAL674 - Jul 13, 15:35 UTCJul 13, 17:05 UTC1h 30m
2026-07-13 UAL1108 - Jul 13, 13:00 UTCJul 13, 14:15 UTC1h 15m
2026-07-13 UAL572 ANC → IAD Jul 13, 05:03 UTCJul 13, 11:19 UTC6h 16m
2026-07-13 UAL572 ANC → IAD Jul 13, 04:50 UTCJul 13, 11:15 UTC6h 25m

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 N17329 page for operator, model, and routing details .

Mode-S A12712 frequently asked

What is Mode-S code A12712?
A12712 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17329.
Where is Mode-S A12712 registered?
Mode-S code A12712 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 A12712 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12712, octal 50223422, decimal 10,561,298.
What flights does A12712 operate?
Mode-S A12712 has broadcast 20 distinct callsigns, including UAL1632, UAL643, UAL2423, UAL1138, UAL765.