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 2h ago
Flights observed
192
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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
UAL2292 United Airlines 7 2026-05-11
UAL1941 - 6 2026-06-30
UAL737 - 5 2026-06-17
UAL3906 - 5 2026-06-20
UAL2814 - 4 2026-07-05
UAL2610 - 4 2026-06-18
UAL2087 - 4 2026-06-24
UAL1962 United Airlines 4 2026-04-22
UAL1946 United Airlines 4 2026-04-23
UAL8135 - 3 2026-04-13
UAL2499 United Airlines 3 2026-04-22
UAL2475 United Airlines 3 2026-04-22
UAL2280 United Airlines 3 2026-04-22
UAL2276 - 3 2026-06-24
UAL2008 United Airlines 3 2026-04-21
UAL1777 - 3 2026-07-01
UAL1636 - 3 2026-06-23
UAL1599 United Airlines 3 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-09 UAL1343 EWR → SFO Jul 9, 17:20 UTCJul 9, 22:45 UTC5h 25m
2026-07-09 UAL2248 SFO → EWR Jul 9, 00:20 UTCJul 9, 05:05 UTC4h 45m
2026-07-06 UAL373 BTV → ORD Jul 6, 21:10 UTCJul 6, 22:00 UTC50m
2026-07-06 UAL373 BTV → ORD Jul 6, 17:20 UTCJul 6, 17:40 UTC20m
2026-07-05 UAL1431 - Jul 5, 20:55 UTCJul 6, 02:05 UTC5h 10m
2026-07-05 UAL2814 - Jul 5, 14:50 UTCJul 5, 18:20 UTC3h 30m
2026-07-05 UAL2278 SFO → ORD Jul 5, 09:00 UTCJul 5, 12:40 UTC3h 40m
2026-07-05 UAL2278 SFO → ORD Jul 5, 08:53 UTCJul 5, 12:35 UTC3h 42m
2026-07-04 UAL1343 - Jul 4, 16:10 UTCJul 4, 21:35 UTC5h 25m
2026-07-03 UAL1700 - Jul 3, 23:20 UTCJul 4, 04:15 UTC4h 55m
2026-07-03 UAL2679 DEN → ORD Jul 3, 16:15 UTCJul 3, 21:30 UTC5h 15m
2026-07-02 UAL1173 SJU → EWR Jul 2, 20:15 UTCJul 2, 21:25 UTC1h 10m
2026-07-02 UAL1173 SJU → EWR Jul 2, 17:45 UTCJul 2, 17:55 UTC10m
2026-07-02 UAL2143 - Jul 2, 12:15 UTCJul 2, 15:30 UTC3h 15m
2026-07-02 UAL3904 ORD → EWR Jul 2, 05:05 UTCJul 2, 06:41 UTC1h 36m
2026-07-02 UAL3904 ORD → EWR Jul 2, 05:13 UTCJul 2, 06:37 UTC1h 24m
2026-07-01 UAL1777 SFO → ORD Jul 1, 22:53 UTCJul 2, 02:19 UTC3h 26m
2026-07-01 UAL1777 - Jul 1, 23:05 UTCJul 2, 02:00 UTC2h 55m
2026-07-01 UAL543 - Jul 1, 17:00 UTCJul 1, 21:05 UTC4h 5m
2026-07-01 UAL1375 JAX → EWR Jul 1, 02:05 UTCJul 1, 05:40 UTC3h 35m
2026-06-30 UAL1577 - Jun 30, 20:05 UTCJul 1, 00:05 UTC4h 0m
2026-06-30 UAL1941 - Jun 30, 14:15 UTCJun 30, 17:45 UTC3h 30m
2026-06-30 UAL1941 LAX → ORD Jun 30, 14:19 UTCJun 30, 17:26 UTC3h 7m
2026-06-30 UAL1967 DEN → MSN Jun 30, 00:09 UTCJun 30, 03:55 UTC3h 46m
2026-06-29 UAL1954 SFO → ORD Jun 29, 17:30 UTCJun 29, 20:59 UTC3h 30m
2026-06-29 UAL246 - Jun 29, 11:25 UTCJun 29, 15:30 UTC4h 5m
2026-06-28 UAL1777 SFO → ORD Jun 28, 21:55 UTCJun 29, 01:20 UTC3h 25m
2026-06-28 UAL543 - Jun 28, 16:19 UTCJun 28, 20:25 UTC4h 5m
2026-06-27 UAL457 - Jun 27, 20:04 UTCJun 27, 23:39 UTC3h 35m
2026-06-27 UAL2814 - Jun 27, 14:09 UTCJun 27, 18:15 UTC4h 5m
2026-06-27 UAL1375 JAX → EWR Jun 27, 02:14 UTCJun 27, 05:39 UTC3h 25m
2026-06-26 UAL2633 PHL → IAH Jun 26, 22:29 UTCJun 27, 00:44 UTC2h 15m
2026-06-26 UAL1604 SFO → BNA Jun 26, 18:54 UTCJun 26, 20:59 UTC2h 5m
2026-06-26 UAL1116 - Jun 26, 12:50 UTCJun 26, 17:00 UTC4h 10m
2026-06-26 UAL1375 JAX → EWR Jun 26, 02:05 UTCJun 26, 05:35 UTC3h 30m
2026-06-25 UAL1577 - Jun 25, 20:09 UTCJun 26, 00:15 UTC4h 5m
2026-06-25 UAL1941 - Jun 25, 17:49 UTCJun 25, 18:10 UTC20m
2026-06-25 UAL1941 - Jun 25, 14:29 UTCJun 25, 18:10 UTC3h 40m
2026-06-25 UAL1941 LAX → ORD Jun 25, 14:19 UTCJun 25, 17:34 UTC3h 15m
2026-06-24 UAL2276 IAD → LAX Jun 24, 22:12 UTCJun 25, 03:02 UTC4h 50m
2026-06-24 UAL2276 - Jun 24, 22:04 UTCJun 25, 03:10 UTC5h 5m
2026-06-24 UAL2087 DEN → IAD Jun 24, 16:41 UTCJun 24, 19:25 UTC2h 44m
2026-06-24 UAL2087 DEN → IAD Jun 24, 16:40 UTCJun 24, 19:24 UTC2h 45m

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 2h ago.
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, UAL2292, UAL1941, UAL737.