Apparatus

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sensors Mode-S transponder

A12755

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17346 · BOEING 737 MAX 8 · operated by UNITED AIRLINES INC

Hex
A12755
Octal
50223525
Decimal
10,561,365
Country
US
Tail
N17346
Type
B38M
Broadcasting now · callsign UAL1787 · 8,500 ft
Flights observed
458
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Current position

A12755 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A12755 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
UAL280 - 10 2026-07-04
UAL1676 - 9 2026-07-11
UAL1675 - 9 2026-07-10
UAL2168 - 8 2026-07-06
UAL716 - 6 2026-07-16
UAL1352 United Airlines 6 2026-07-20
UAL2153 - 5 2026-07-19
UAL1632 United Airlines 5 2026-06-07
UAL1320 United Airlines 5 2026-07-20
UAL359 United Airlines 4 2026-07-21
UAL340 United Airlines 4 2026-05-09
UAL2614 United Airlines 4 2026-07-25
UAL2392 - 4 2026-06-24
UAL2350 United Airlines 4 2026-07-19
UAL2036 United Airlines 4 2026-05-26
UAL1959 United Airlines 4 2026-05-15
UAL840 United Airlines 3 2026-06-14
UAL577 United Airlines 3 2026-04-28
UAL477 - 3 2026-06-14
UAL474 United Airlines 3 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1415 IAH → MSY Jul 26, 17:45 UTCJul 26, 19:50 UTC2h 5m
2026-07-26 UAL1891 CLE → EWR Jul 26, 14:20 UTCJul 26, 15:55 UTC1h 35m
2026-07-26 UAL667 IAD → LAX Jul 26, 03:35 UTCJul 26, 05:15 UTC1h 40m
2026-07-25 UAL1153 MYR → EWR Jul 25, 20:35 UTCJul 26, 01:20 UTC4h 45m
2026-07-25 UAL394 OGG → SFO Jul 25, 14:00 UTCJul 25, 18:50 UTC4h 50m
2026-07-25 UAL2614 LAX → EWR Jul 25, 07:27 UTCJul 25, 11:56 UTC4h 29m
2026-07-25 UAL2614 LAX → EWR Jul 25, 07:15 UTCJul 25, 12:00 UTC4h 45m
2026-07-24 UAL2073 DEN → SFO Jul 24, 22:29 UTCJul 25, 06:00 UTC7h 31m
2026-07-24 UAL2073 DEN → SFO Jul 24, 22:40 UTCJul 25, 06:05 UTC7h 25m
2026-07-24 UAL1926 SEA → SFO Jul 24, 11:45 UTCJul 24, 13:00 UTC1h 15m
2026-07-24 UAL1401 AUS → SFO Jul 24, 00:10 UTCJul 24, 01:55 UTC1h 45m
2026-07-23 UAL224 ORD → EWR Jul 23, 15:00 UTCJul 23, 21:25 UTC6h 25m
2026-07-21 UAL474 MEX → ORD Jul 21, 20:45 UTCJul 22, 00:55 UTC4h 10m
2026-07-21 UAL359 ORD → MEX Jul 21, 14:56 UTCJul 21, 18:36 UTC3h 40m
2026-07-21 UAL359 ORD → MEX Jul 21, 15:10 UTCJul 21, 18:35 UTC3h 25m
2026-07-21 UAL660 EWR → CHS Jul 21, 10:20 UTCJul 21, 12:20 UTC2h 0m
2026-07-21 UAL8122 YUL → BOS Jul 21, 04:30 UTCJul 21, 05:55 UTC1h 25m
2026-07-20 UAL1352 IAH → CMH Jul 20, 21:25 UTCJul 21, 01:20 UTC3h 54m
2026-07-20 UAL1320 SFO → ONT Jul 20, 18:00 UTCJul 20, 19:50 UTC1h 50m
2026-07-20 UAL1716 PHL → DEN Jul 20, 12:20 UTCJul 20, 14:30 UTC2h 10m
2026-07-20 UAL1300 ATL → ORD Jul 20, 00:55 UTCJul 20, 03:00 UTC2h 5m
2026-07-19 UAL2350 SAN → ORD Jul 19, 21:15 UTCJul 19, 23:20 UTC2h 5m
2026-07-19 UAL2153 - Jul 19, 18:30 UTCJul 19, 19:25 UTC55m
2026-07-19 UAL2153 SFO → RDM Jul 19, 18:26 UTCJul 19, 19:22 UTC56m
2026-07-19 UAL2177 - Jul 19, 11:10 UTCJul 19, 15:50 UTC4h 40m
2026-07-19 UAL2117 SAN → SFO Jul 19, 04:45 UTCJul 19, 09:05 UTC4h 20m
2026-07-19 UAL1726 ORD → ALB Jul 19, 01:50 UTCJul 19, 02:40 UTC50m
2026-07-18 UAL2010 - Jul 18, 15:35 UTCJul 18, 16:15 UTC40m
2026-07-18 UAL1685 - Jul 18, 09:00 UTCJul 18, 13:30 UTC4h 30m
2026-07-18 UAL1684 SFO → LIH Jul 18, 00:29 UTCJul 18, 05:25 UTC4h 56m
2026-07-17 UAL1958 RDU → EWR Jul 17, 17:27 UTCJul 17, 21:45 UTC4h 18m
2026-07-17 UAL1124 SFO → OGG Jul 17, 02:54 UTCJul 17, 07:24 UTC4h 30m
2026-07-17 UAL1124 - Jul 17, 02:39 UTCJul 17, 03:30 UTC50m
2026-07-16 UAL1955 SLC → SFO Jul 16, 23:29 UTCJul 17, 01:00 UTC1h 30m
2026-07-16 UAL1840 EWR → ORD Jul 16, 19:59 UTCJul 16, 20:51 UTC52m
2026-07-16 UAL1840 EWR → ORD Jul 16, 19:55 UTCJul 16, 20:55 UTC1h 0m
2026-07-16 UAL716 LGA → DEN Jul 16, 14:29 UTCJul 16, 17:54 UTC3h 25m
2026-07-15 UAL1579 DEN → LGA Jul 15, 21:20 UTCJul 16, 00:30 UTC3h 10m
2026-07-15 UAL2200 LGA → DEN Jul 15, 16:40 UTCJul 15, 20:00 UTC3h 20m
2026-07-15 UAL2092 - Jul 15, 13:15 UTCJul 15, 14:55 UTC1h 40m
2026-07-15 UAL450 - Jul 15, 04:05 UTCJul 15, 09:30 UTC5h 25m
2026-07-14 UAL2369 - Jul 14, 19:50 UTCJul 15, 02:30 UTC6h 39m
2026-07-14 UAL700 - Jul 14, 15:00 UTCJul 14, 17:55 UTC2h 55m
2026-07-14 UAL2761 - Jul 14, 02:00 UTCJul 14, 04:45 UTC2h 45m
2026-07-13 UAL1245 - Jul 13, 22:35 UTCJul 13, 23:05 UTC30m
2026-07-13 UAL1245 - Jul 13, 21:10 UTCJul 13, 21:50 UTC40m
2026-07-13 UAL1244 - Jul 13, 14:55 UTCJul 13, 16:45 UTC1h 50m
2026-07-13 UAL1244 IAH → PLS Jul 13, 14:58 UTCJul 13, 18:28 UTC3h 30m
2026-07-13 UAL2302 - Jul 13, 10:40 UTCJul 13, 13:25 UTC2h 45m
2026-07-12 UAL2439 - Jul 12, 23:45 UTCJul 13, 02:20 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 N17346 page for operator, model, and routing details .

Mode-S A12755 frequently asked

What is Mode-S code A12755?
A12755 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17346.
Where is Mode-S A12755 registered?
Mode-S code A12755 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 A12755 broadcasting right now?
Yes. Mode-S A12755 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12755, octal 50223525, decimal 10,561,365.
What flights does A12755 operate?
Mode-S A12755 has broadcast 20 distinct callsigns, including UAL280, UAL1676, UAL1675, UAL2168, UAL716.