Apparatus

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sensors Mode-S transponder

AA1368

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N74856 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
AA1368
Octal
52411550
Decimal
11,146,088
Country
US
Tail
N74856
Type
B753
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
235
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S AA1368.

Country allocation

The ICAO 24-bit address AA1368 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
UAL1721 United Airlines 16 2026-05-08
UAL1722 United Airlines 14 2026-05-09
UAL1941 United Airlines 9 2026-07-26
UAL1636 - 8 2026-07-17
UAL2814 United Airlines 7 2026-07-22
UAL2292 United Airlines 7 2026-05-11
UAL1967 United Airlines 6 2026-07-26
UAL1777 - 6 2026-07-21
UAL1577 United Airlines 6 2026-07-26
UAL1224 - 6 2026-07-16
UAL737 - 5 2026-06-17
UAL543 United Airlines 5 2026-07-21
UAL3906 - 5 2026-06-20
UAL1954 United Airlines 5 2026-07-25
UAL457 United Airlines 4 2026-07-22
UAL2610 - 4 2026-06-18
UAL2276 - 4 2026-07-14
UAL2087 - 4 2026-06-24
UAL1962 United Airlines 4 2026-04-22
UAL1946 United Airlines 4 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1577 RNO → SFO Jul 26, 20:15 UTCJul 26, 22:00 UTC1h 45m
2026-07-26 UAL1941 IAD → EWR Jul 26, 14:25 UTCJul 26, 18:00 UTC3h 35m
2026-07-26 UAL1941 IAD → EWR Jul 26, 14:19 UTCJul 26, 17:37 UTC3h 18m
2026-07-26 UAL1967 DEN → MSN Jul 26, 00:05 UTCJul 26, 03:40 UTC3h 35m
2026-07-26 UAL1967 DEN → MSN Jul 26, 00:02 UTCJul 26, 03:33 UTC3h 31m
2026-07-25 UAL1954 RDM → SFO Jul 25, 18:21 UTCJul 25, 21:36 UTC3h 15m
2026-07-25 UAL1954 RDM → SFO Jul 25, 18:25 UTCJul 25, 21:55 UTC3h 30m
2026-07-25 UAL2391 ORD → EWR Jul 25, 14:20 UTCJul 25, 16:30 UTC2h 10m
2026-07-24 UAL1654 OMA → SFO Jul 24, 23:45 UTCJul 25, 01:45 UTC2h 0m
2026-07-24 UAL1829 EWR → SFO Jul 24, 20:00 UTCJul 24, 21:55 UTC1h 55m
2026-07-24 UAL1865 SLC → EWR Jul 24, 14:30 UTCJul 24, 17:45 UTC3h 15m
2026-07-24 UAL2282 SAN → IAD Jul 24, 07:45 UTCJul 24, 12:10 UTC4h 25m
2026-07-24 UAL1967 DEN → MSN Jul 24, 00:15 UTCJul 24, 03:45 UTC3h 30m
2026-07-23 UAL1954 RDM → SFO Jul 23, 17:30 UTCJul 23, 21:15 UTC3h 45m
2026-07-23 UAL246 ORD → LGA Jul 23, 11:30 UTCJul 23, 15:30 UTC4h 0m
2026-07-22 UAL457 BWI → SFO Jul 22, 23:55 UTCJul 23, 03:25 UTC3h 30m
2026-07-22 UAL457 BWI → SFO Jul 22, 23:53 UTCJul 23, 03:07 UTC3h 14m
2026-07-22 UAL2814 EWR → IAH Jul 22, 18:35 UTCJul 22, 22:15 UTC3h 40m
2026-07-21 UAL1777 EWR → SFO Jul 21, 22:03 UTCJul 22, 01:25 UTC3h 22m
2026-07-21 UAL1777 SFO → ORD Jul 21, 22:05 UTCJul 22, 01:40 UTC3h 35m
2026-07-21 UAL543 IAH → MCO Jul 21, 16:25 UTCJul 21, 20:05 UTC3h 40m
2026-07-20 UAL457 BWI → SFO Jul 20, 20:00 UTCJul 20, 23:55 UTC3h 55m
2026-07-20 UAL2814 ORD → LAX Jul 20, 14:18 UTCJul 20, 17:42 UTC3h 24m
2026-07-20 UAL2814 ORD → LAX Jul 20, 14:15 UTCJul 20, 17:50 UTC3h 35m
2026-07-19 UAL1777 SFO → ORD Jul 19, 22:05 UTCJul 20, 01:35 UTC3h 30m
2026-07-19 UAL543 IAH → MCO Jul 19, 15:56 UTCJul 19, 19:31 UTC3h 35m
2026-07-19 UAL543 IAH → MCO Jul 19, 15:50 UTCJul 19, 19:35 UTC3h 45m
2026-07-18 UAL1375 JAX → EWR Jul 18, 02:19 UTCJul 18, 05:50 UTC3h 31m
2026-07-17 UAL1577 RNO → SFO Jul 17, 21:00 UTCJul 18, 00:39 UTC3h 40m
2026-07-17 UAL1577 RNO → SFO Jul 17, 21:03 UTCJul 18, 00:39 UTC3h 36m
2026-07-17 UAL1941 IAD → EWR Jul 17, 14:35 UTCJul 17, 18:34 UTC4h 0m
2026-07-17 UAL1636 - Jul 17, 01:25 UTCJul 17, 01:39 UTC15m
2026-07-17 UAL1636 HNL → LAX Jul 17, 01:33 UTCJul 17, 06:26 UTC4h 53m
2026-07-16 UAL1224 - Jul 16, 18:40 UTCJul 16, 23:44 UTC5h 5m
2026-07-16 UAL1636 - Jul 16, 01:25 UTCJul 16, 01:40 UTC15m
2026-07-16 UAL1636 HNL → LAX Jul 16, 01:33 UTCJul 16, 06:24 UTC4h 51m
2026-07-16 UAL1636 HNL → LAX Jul 16, 01:33 UTCJul 16, 06:06 UTC4h 33m
2026-07-15 UAL1224 - Jul 15, 23:35 UTCJul 15, 23:50 UTC15m
2026-07-15 UAL1224 - Jul 15, 18:30 UTCJul 15, 18:55 UTC25m
2026-07-15 UAL1224 LAX → HNL Jul 15, 18:25 UTCJul 15, 23:52 UTC5h 27m
2026-07-14 UAL2276 - Jul 14, 22:15 UTCJul 15, 02:45 UTC4h 29m
2026-07-14 UAL2268 - Jul 14, 15:25 UTCJul 14, 20:05 UTC4h 40m
2026-07-14 UAL1967 ORD → LAX Jul 14, 01:57 UTCJul 14, 05:06 UTC3h 9m
2026-07-14 UAL1967 - Jul 14, 01:30 UTCJul 14, 04:50 UTC3h 20m
2026-07-13 UAL1954 SFO → ORD Jul 13, 19:05 UTCJul 13, 22:45 UTC3h 40m
2026-07-13 UAL1558 - Jul 13, 00:55 UTCJul 13, 06:01 UTC5h 5m
2026-07-10 UAL274 SFO → EWR Jul 10, 20:45 UTCJul 11, 02:15 UTC5h 30m
2026-07-10 UAL2115 - Jul 10, 10:40 UTCJul 10, 16:35 UTC5h 55m
2026-07-10 UAL2626 SFO → EWR Jul 10, 01:00 UTCJul 10, 05:50 UTC4h 50m
2026-07-10 UAL2626 SFO → EWR Jul 10, 00:24 UTCJul 10, 05:46 UTC5h 22m

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 N74856 page for operator, model, and routing details .

Mode-S AA1368 frequently asked

What is Mode-S code AA1368?
AA1368 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N74856.
Where is Mode-S AA1368 registered?
Mode-S code AA1368 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 AA1368 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA1368, octal 52411550, decimal 11,146,088.
What flights does AA1368 operate?
Mode-S AA1368 has broadcast 20 distinct callsigns, including UAL1721, UAL1722, UAL1941, UAL1636, UAL2814.