Apparatus

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sensors Mode-S transponder

A12A7C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17402 · BOEING 737 MAX 9 · operated by UMB BANK NA TRUSTEE

Hex
A12A7C
Octal
50225174
Decimal
10,562,172
Country
US
Tail
N17402
Type
B39M
No current signal · last broadcast Jul 26, 19:25 UTC
Flights observed
451
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:25 UTC

Last known position

Most recent position reported by Mode-S A12A7C.

Country allocation

The ICAO 24-bit address A12A7C 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
UAL2380 - 5 2026-07-02
UAL2406 - 4 2026-07-10
UAL2223 - 4 2026-07-14
UAL1644 - 4 2026-06-26
UAL1497 - 4 2026-06-26
UAL1250 United Airlines 4 2026-06-10
UAL1136 - 4 2026-06-22
UAL1031 United Airlines 4 2026-06-11
UAL8150 United Airlines 3 2026-05-20
UAL8100 United Airlines 3 2026-06-09
UAL797 United Airlines 3 2026-04-13
UAL432 United Airlines 3 2026-07-26
UAL379 United Airlines 3 2026-05-07
UAL2456 United Airlines 3 2026-07-25
UAL2441 United Airlines 3 2026-05-31
UAL2379 United Airlines 3 2026-07-25
UAL2270 United Airlines 3 2026-06-08
UAL2095 United Airlines 3 2026-07-22
UAL2039 United Airlines 3 2026-05-23
UAL1810 - 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL3753 CVG → EWR Jul 26, 17:00 UTCJul 26, 19:25 UTC2h 25m
2026-07-26 UAL2484 - Jul 26, 12:55 UTCJul 26, 14:45 UTC1h 50m
2026-07-26 UAL432 ATL → EWR Jul 26, 01:25 UTCJul 26, 03:20 UTC1h 55m
2026-07-26 UAL432 ATL → EWR Jul 26, 01:27 UTCJul 26, 03:43 UTC2h 16m
2026-07-25 UAL1810 - Jul 25, 13:00 UTCJul 25, 22:40 UTC9h 40m
2026-07-25 UAL2379 ORF → EWR Jul 25, 07:10 UTCJul 25, 10:55 UTC3h 45m
2026-07-25 UAL2456 LAX → EWR Jul 25, 01:20 UTCJul 25, 05:25 UTC4h 5m
2026-07-24 UAL1163 IAH → MBJ Jul 24, 15:25 UTCJul 24, 22:30 UTC7h 5m
2026-07-24 UAL2491 SFO → DEN Jul 24, 11:30 UTCJul 24, 13:15 UTC1h 45m
2026-07-22 UAL2865 DEN → ORD Jul 22, 23:40 UTCJul 23, 01:45 UTC2h 5m
2026-07-22 UAL1710 JAX → ORD Jul 22, 18:10 UTCJul 22, 21:35 UTC3h 25m
2026-07-22 UAL2428 - Jul 22, 12:25 UTCJul 22, 16:05 UTC3h 40m
2026-07-22 UAL2428 ORD → SAN Jul 22, 12:34 UTCJul 22, 16:00 UTC3h 26m
2026-07-22 UAL1962 MCO → ORD Jul 22, 06:48 UTCJul 22, 10:12 UTC3h 24m
2026-07-22 UAL2095 ORD → LAX Jul 22, 01:40 UTCJul 22, 04:25 UTC2h 45m
2026-07-21 UAL1216 EWR → ATL Jul 21, 21:00 UTCJul 21, 23:10 UTC2h 10m
2026-07-21 UAL410 LAX → LAS Jul 21, 17:15 UTCJul 21, 19:30 UTC2h 15m
2026-07-21 UAL2168 JAX → IAH Jul 21, 12:20 UTCJul 21, 15:45 UTC3h 25m
2026-07-21 UAL1609 IAH → SFO Jul 21, 03:50 UTCJul 21, 07:00 UTC3h 10m
2026-07-21 UAL2114 - Jul 21, 00:50 UTCJul 21, 01:30 UTC40m
2026-07-20 UAL1590 EWR → IAH Jul 20, 19:55 UTCJul 20, 22:50 UTC2h 55m
2026-07-20 UAL2402 LAX → BOS Jul 20, 15:10 UTCJul 20, 18:25 UTC3h 15m
2026-07-20 UAL2402 LAX → BOS Jul 20, 15:11 UTCJul 20, 18:23 UTC3h 12m
2026-07-20 UAL1823 SFO → DEN Jul 20, 12:30 UTCJul 20, 13:40 UTC1h 10m
2026-07-20 UAL497 CVG → DEN Jul 20, 01:45 UTCJul 20, 02:55 UTC1h 10m
2026-07-19 UAL2204 - Jul 19, 20:25 UTCJul 19, 23:25 UTC3h 0m
2026-07-19 UAL3042 SFO → EWR Jul 19, 16:20 UTCJul 19, 19:05 UTC2h 45m
2026-07-19 UAL2488 EWR → ORD Jul 19, 12:15 UTCJul 19, 14:20 UTC2h 5m
2026-07-18 UAL614 PHL → ORD Jul 18, 19:06 UTCJul 19, 00:07 UTC5h 1m
2026-07-18 UAL614 PHL → ORD Jul 18, 13:30 UTCJul 19, 00:10 UTC10h 40m
2026-07-18 UAL1833 BOS → EWR Jul 18, 10:30 UTCJul 18, 11:25 UTC55m
2026-07-17 UAL521 JFK → SFO Jul 17, 23:30 UTCJul 18, 02:55 UTC3h 26m
2026-07-17 UAL1017 - Jul 17, 19:15 UTCJul 17, 21:15 UTC2h 0m
2026-07-17 UAL1050 MCO → EWR Jul 17, 14:00 UTCJul 17, 17:30 UTC3h 30m
2026-07-17 UAL1833 BOS → EWR Jul 17, 10:25 UTCJul 17, 11:15 UTC50m
2026-07-17 UAL521 - Jul 17, 00:04 UTCJul 17, 03:14 UTC3h 10m
2026-07-15 UAL1373 - Jul 15, 19:40 UTCJul 15, 21:55 UTC2h 15m
2026-07-15 UAL2225 - Jul 15, 14:30 UTCJul 15, 17:25 UTC2h 55m
2026-07-15 UAL1640 FAI → ORD Jul 15, 05:57 UTCJul 15, 10:56 UTC4h 59m
2026-07-15 UAL1640 - Jul 15, 05:50 UTCJul 15, 06:30 UTC40m
2026-07-14 UAL2223 - Jul 14, 22:40 UTCJul 15, 04:30 UTC5h 49m
2026-07-14 UAL2223 TPA → ORD Jul 14, 16:45 UTCJul 14, 18:55 UTC2h 10m
2026-07-14 UAL2326 - Jul 14, 12:55 UTCJul 14, 15:05 UTC2h 10m
2026-07-14 UAL1738 IAD → ORD Jul 14, 02:50 UTCJul 14, 04:15 UTC1h 25m
2026-07-13 UAL2024 - Jul 13, 23:50 UTCJul 14, 00:50 UTC1h 0m
2026-07-13 UAL2024 - Jul 13, 21:30 UTCJul 13, 21:40 UTC10m
2026-07-13 UAL1192 - Jul 13, 15:50 UTCJul 13, 19:10 UTC3h 20m
2026-07-13 UAL2314 - Jul 13, 11:15 UTCJul 13, 13:40 UTC2h 25m
2026-07-13 UAL2314 FLL → IAH Jul 13, 11:17 UTCJul 13, 13:39 UTC2h 22m
2026-07-12 UAL2294 - Jul 12, 23:20 UTCJul 13, 01:55 UTC2h 35m

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 N17402 page for operator, model, and routing details .

Mode-S A12A7C frequently asked

What is Mode-S code A12A7C?
A12A7C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17402.
Where is Mode-S A12A7C registered?
Mode-S code A12A7C 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 A12A7C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12A7C, octal 50225174, decimal 10,562,172.
What flights does A12A7C operate?
Mode-S A12A7C has broadcast 20 distinct callsigns, including UAL2380, UAL2406, UAL2223, UAL1644, UAL1497.