Apparatus

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sensors Mode-S transponder

A12A9D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17410 · operated by BOEING CO

Hex
A12A9D
Octal
50225235
Decimal
10,562,205
Country
US
Tail
N17410
Type
B39M
Broadcasting now · callsign UAL2724 · 25 ft
Flights observed
447
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Current position

A12A9D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A12A9D 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
UAL1331 United Airlines 7 2026-06-07
UAL2435 - 6 2026-07-16
UAL727 - 5 2026-07-10
UAL2855 - 5 2026-07-09
UAL1181 - 5 2026-07-10
UAL1073 United Airlines 5 2026-07-16
UAL240 United Airlines 4 2026-05-30
UAL2131 - 4 2026-06-20
UAL1791 United Airlines 4 2026-07-24
UAL1730 - 4 2026-07-09
UAL1644 - 4 2026-04-17
UAL1591 United Airlines 4 2026-06-16
UAL1372 United Airlines 4 2026-07-23
UAL1147 - 4 2026-04-14
UAL1116 United Airlines 4 2026-05-20
UAL1043 United Airlines 4 2026-06-08
UAL701 United Airlines 3 2026-04-17
UAL679 - 3 2026-07-10
UAL668 United Airlines 3 2026-05-31
UAL641 - 3 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL246 ORD → LGA Jul 26, 19:20 UTCJul 26, 21:15 UTC1h 55m
2026-07-26 UAL323 EWR → ORD Jul 26, 11:45 UTCJul 26, 17:30 UTC5h 45m
2026-07-26 UAL796 FLL → EWR Jul 26, 04:45 UTCJul 26, 09:50 UTC5h 6m
2026-07-25 UAL2462 YVR → SFO Jul 25, 21:40 UTCJul 26, 02:25 UTC4h 45m
2026-07-25 UAL608 IAD → EWR Jul 25, 15:25 UTCJul 25, 19:40 UTC4h 15m
2026-07-25 UAL1609 IAH → SFO Jul 25, 04:00 UTCJul 25, 07:15 UTC3h 15m
2026-07-24 UAL2002 SFO → IAD Jul 24, 22:00 UTCJul 25, 01:40 UTC3h 40m
2026-07-24 UAL1791 LAS → ORD Jul 24, 19:30 UTCJul 24, 20:30 UTC1h 0m
2026-07-24 UAL360 DFW → EWR Jul 24, 10:40 UTCJul 24, 16:10 UTC5h 30m
2026-07-23 UAL1372 SFO → LAS Jul 23, 19:47 UTCJul 24, 00:46 UTC4h 59m
2026-07-23 UAL1372 SFO → LAS Jul 23, 19:45 UTCJul 24, 00:50 UTC5h 5m
2026-07-23 UAL323 EWR → ORD Jul 23, 12:00 UTCJul 23, 17:50 UTC5h 50m
2026-07-23 UAL2001 SNA → EWR Jul 23, 00:15 UTCJul 23, 05:20 UTC5h 5m
2026-07-22 UAL1343 EWR → TPA Jul 22, 16:35 UTCJul 22, 22:30 UTC5h 55m
2026-07-22 UAL371 BNA → EWR Jul 22, 12:20 UTCJul 22, 14:15 UTC1h 55m
2026-07-21 UAL3922 - Jul 21, 20:50 UTCJul 21, 21:45 UTC55m
2026-07-21 UAL1929 YQX → HHN Jul 21, 15:10 UTCJul 21, 16:10 UTC1h 0m
2026-07-21 UAL2232 ORD → MSP Jul 21, 12:15 UTCJul 21, 13:10 UTC55m
2026-07-21 UAL2106 IAH → EWR Jul 21, 00:55 UTCJul 21, 03:45 UTC2h 50m
2026-07-20 UAL2213 LAX → EWR Jul 20, 20:40 UTCJul 20, 23:05 UTC2h 25m
2026-07-20 UAL2080 ORD → SFO Jul 20, 15:50 UTCJul 20, 18:25 UTC2h 35m
2026-07-20 UAL2785 EWR → HNL Jul 20, 11:30 UTCJul 20, 14:00 UTC2h 30m
2026-07-20 UAL758 DEN → ORD Jul 20, 02:00 UTCJul 20, 03:55 UTC1h 55m
2026-07-20 UAL758 DEN → ORD Jul 20, 01:47 UTCJul 20, 03:50 UTC2h 3m
2026-07-19 UAL1391 LAS → EWR Jul 19, 22:35 UTCJul 20, 00:30 UTC1h 55m
2026-07-19 UAL8189 PHL → YYZ Jul 19, 19:55 UTCJul 19, 20:35 UTC40m
2026-07-18 UAL2489 - Jul 18, 13:15 UTCJul 18, 21:45 UTC8h 30m
2026-07-18 UAL427 - Jul 18, 05:50 UTCJul 18, 10:35 UTC4h 45m
2026-07-17 UAL2054 IAD → SAN Jul 17, 22:29 UTCJul 18, 03:00 UTC4h 31m
2026-07-17 UAL2054 RSW → IAD Jul 17, 22:24 UTCJul 18, 02:54 UTC4h 30m
2026-07-17 UAL1873 - Jul 17, 16:15 UTCJul 17, 20:25 UTC4h 10m
2026-07-16 UAL1938 IAD → PHX Jul 16, 22:00 UTCJul 17, 01:59 UTC4h 0m
2026-07-16 UAL2435 - Jul 16, 17:30 UTCJul 16, 19:30 UTC2h 0m
2026-07-16 UAL2435 IAD → SMF Jul 16, 17:28 UTCJul 16, 19:38 UTC2h 10m
2026-07-16 UAL1073 IAD → MIA Jul 16, 13:03 UTCJul 16, 15:23 UTC2h 20m
2026-07-16 UAL1073 IAD → MIA Jul 16, 13:15 UTCJul 16, 15:25 UTC2h 10m
2026-07-16 UAL1366 - Jul 16, 10:20 UTCJul 16, 11:05 UTC45m
2026-07-16 UAL1162 - Jul 16, 07:05 UTCJul 16, 08:05 UTC1h 0m
2026-07-16 UAL569 - Jul 16, 00:15 UTCJul 16, 01:05 UTC50m
2026-07-15 UAL569 EWR → BQN Jul 15, 23:36 UTCJul 16, 03:23 UTC3h 47m
2026-07-15 UAL353 - Jul 15, 17:40 UTCJul 15, 20:00 UTC2h 20m
2026-07-15 UAL2018 - Jul 15, 13:40 UTCJul 15, 15:50 UTC2h 10m
2026-07-14 UAL1905 - Jul 14, 06:20 UTCJul 14, 11:00 UTC4h 40m
2026-07-14 UAL1905 POS → EWR Jul 14, 06:12 UTCJul 14, 10:55 UTC4h 43m
2026-07-13 UAL1904 - Jul 13, 23:55 UTCJul 14, 04:05 UTC4h 10m
2026-07-13 UAL1574 DFW → EWR Jul 13, 18:20 UTCJul 13, 21:25 UTC3h 5m
2026-07-13 UAL1574 DFW → EWR Jul 13, 18:13 UTCJul 13, 21:23 UTC3h 10m
2026-07-13 UAL454 - Jul 13, 13:35 UTCJul 13, 16:25 UTC2h 50m
2026-07-13 UAL1905 - Jul 13, 06:30 UTCJul 13, 11:05 UTC4h 35m
2026-07-13 UAL1904 EWR → POS Jul 13, 00:13 UTCJul 13, 04:34 UTC4h 21m

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 N17410 page for operator, model, and routing details .

Mode-S A12A9D frequently asked

What is Mode-S code A12A9D?
A12A9D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17410.
Where is Mode-S A12A9D registered?
Mode-S code A12A9D 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 A12A9D broadcasting right now?
Yes. Mode-S A12A9D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12A9D, octal 50225235, decimal 10,562,205.
What flights does A12A9D operate?
Mode-S A12A9D has broadcast 20 distinct callsigns, including UAL1331, UAL2435, UAL727, UAL2855, UAL1181.