Apparatus

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sensors Mode-S transponder

AA2B79

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N75410 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
AA2B79
Octal
52425571
Decimal
11,152,249
Country
US
Tail
N75410
Type
B739
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
456
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AA2B79.

Country allocation

The ICAO 24-bit address AA2B79 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
UAL315 United Airlines 13 2026-07-22
UAL2662 United Airlines 13 2026-07-26
UAL496 United Airlines 11 2026-07-18
UAL2181 United Airlines 11 2026-05-11
UAL1927 - 11 2026-06-29
UAL1872 - 11 2026-07-08
UAL740 - 9 2026-06-22
UAL2406 United Airlines 9 2026-07-23
UAL2245 - 9 2026-07-14
UAL1444 United Airlines 9 2026-07-22
UAL2293 - 8 2026-07-15
UAL2237 United Airlines 8 2026-07-21
UAL1950 - 8 2026-06-29
UAL1752 United Airlines 8 2026-07-19
UAL1493 - 8 2026-07-14
UAL1420 - 8 2026-07-07
UAL1345 - 8 2026-07-19
UAL1127 United Airlines 8 2026-07-23
UAL465 United Airlines 7 2026-04-27
UAL2304 United Airlines 7 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2662 DEN → PDX Jul 26, 21:55 UTCJul 26, 22:15 UTC20m
2026-07-26 UAL2827 IAH → ORD Jul 26, 15:40 UTCJul 26, 16:30 UTC50m
2026-07-26 UAL2250 IAH → SAT Jul 26, 13:40 UTCJul 26, 14:10 UTC30m
2026-07-24 UAL1885 SLC → SFO Jul 24, 01:55 UTCJul 24, 04:05 UTC2h 10m
2026-07-23 UAL1507 HAV → IAH Jul 23, 22:25 UTCJul 24, 00:25 UTC2h 0m
2026-07-23 UAL2406 LAX → SFO Jul 23, 18:25 UTCJul 23, 20:20 UTC1h 55m
2026-07-23 UAL2310 MIA → EWR Jul 23, 14:50 UTCJul 23, 16:50 UTC2h 0m
2026-07-23 UAL1127 ORD → SFO Jul 23, 12:20 UTCJul 23, 13:20 UTC1h 0m
2026-07-23 UAL2304 SFO → PSP Jul 23, 01:40 UTCJul 23, 02:35 UTC55m
2026-07-22 UAL1444 SFO → IAH Jul 22, 21:10 UTCJul 22, 23:40 UTC2h 30m
2026-07-22 UAL315 FLL → IAD Jul 22, 17:20 UTCJul 22, 19:45 UTC2h 25m
2026-07-21 UAL2237 ORD → EWR Jul 21, 19:20 UTCJul 21, 22:05 UTC2h 45m
2026-07-21 UAL2491 - Jul 21, 15:10 UTCJul 21, 18:00 UTC2h 50m
2026-07-21 UAL1127 ORD → SFO Jul 21, 12:30 UTCJul 21, 13:40 UTC1h 10m
2026-07-21 UAL2304 - Jul 21, 01:25 UTCJul 21, 02:25 UTC1h 0m
2026-07-21 UAL2304 IAH → OKC Jul 21, 01:32 UTCJul 21, 02:11 UTC39m
2026-07-20 UAL2833 EWR → IAH Jul 20, 21:20 UTCJul 20, 23:25 UTC2h 5m
2026-07-20 UAL1361 SNA → IAH Jul 20, 17:35 UTCJul 20, 19:45 UTC2h 10m
2026-07-20 UAL1361 SNA → IAH Jul 20, 17:40 UTCJul 20, 19:44 UTC2h 4m
2026-07-20 UAL2863 - Jul 20, 12:30 UTCJul 20, 15:55 UTC3h 25m
2026-07-20 UAL2863 SMF → IAH Jul 20, 12:27 UTCJul 20, 15:53 UTC3h 26m
2026-07-20 UAL1148 DEN → BOS Jul 20, 02:20 UTCJul 20, 05:35 UTC3h 15m
2026-07-19 UAL1752 EWR → MCO Jul 19, 21:35 UTCJul 19, 23:40 UTC2h 5m
2026-07-19 UAL1345 - Jul 19, 17:45 UTCJul 19, 20:05 UTC2h 20m
2026-07-19 UAL2611 - Jul 19, 13:25 UTCJul 19, 15:20 UTC1h 55m
2026-07-18 UAL496 EWR → SFO Jul 18, 20:25 UTCJul 18, 22:35 UTC2h 10m
2026-07-18 UAL1127 ORD → SFO Jul 18, 14:10 UTCJul 18, 15:10 UTC1h 0m
2026-07-18 UAL2304 - Jul 18, 01:50 UTCJul 18, 02:50 UTC1h 1m
2026-07-17 UAL1444 - Jul 17, 22:00 UTCJul 18, 00:19 UTC2h 20m
2026-07-17 UAL1444 PIT → IAH Jul 17, 21:31 UTCJul 18, 00:17 UTC2h 46m
2026-07-17 UAL315 - Jul 17, 17:15 UTCJul 17, 19:35 UTC2h 20m
2026-07-17 UAL315 IAH → PIT Jul 17, 17:21 UTCJul 17, 19:35 UTC2h 14m
2026-07-17 UAL2827 - Jul 17, 14:50 UTCJul 17, 15:25 UTC35m
2026-07-17 UAL2250 - Jul 17, 12:50 UTCJul 17, 13:25 UTC35m
2026-07-17 UAL2449 SJC → IAH Jul 17, 00:14 UTCJul 17, 02:54 UTC2h 40m
2026-07-16 UAL1971 EWR → SAT Jul 16, 19:40 UTCJul 16, 22:25 UTC2h 45m
2026-07-16 UAL2812 - Jul 16, 15:49 UTCJul 16, 18:10 UTC2h 20m
2026-07-16 UAL8178 - Jul 16, 01:35 UTCJul 16, 03:55 UTC2h 20m
2026-07-15 UAL2293 - Jul 15, 19:40 UTCJul 15, 23:25 UTC3h 45m
2026-07-15 UAL2293 SEA → IAH Jul 15, 19:15 UTCJul 15, 23:19 UTC4h 4m
2026-07-15 UAL2654 - Jul 15, 13:25 UTCJul 15, 17:10 UTC3h 45m
2026-07-15 UAL2215 - Jul 15, 02:15 UTCJul 15, 04:15 UTC2h 0m
2026-07-15 UAL2215 MCO → IAH Jul 15, 02:18 UTCJul 15, 04:11 UTC1h 53m
2026-07-14 UAL496 - Jul 14, 23:10 UTCJul 15, 01:10 UTC2h 0m
2026-07-14 UAL1493 - Jul 14, 17:00 UTCJul 14, 19:00 UTC2h 0m
2026-07-14 UAL2245 - Jul 14, 13:45 UTCJul 14, 15:40 UTC1h 55m
2026-07-14 UAL780 - Jul 14, 07:15 UTCJul 14, 11:00 UTC3h 45m
2026-07-14 UAL8220 - Jul 14, 02:10 UTCJul 14, 05:50 UTC3h 40m
2026-07-14 UAL8220 IAH → PDX Jul 14, 02:10 UTCJul 14, 05:49 UTC3h 39m
2026-07-13 UAL2833 - Jul 13, 22:40 UTCJul 14, 00:35 UTC1h 55m

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 N75410 page for operator, model, and routing details .

Mode-S AA2B79 frequently asked

What is Mode-S code AA2B79?
AA2B79 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N75410.
Where is Mode-S AA2B79 registered?
Mode-S code AA2B79 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 AA2B79 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA2B79, octal 52425571, decimal 11,152,249.
What flights does AA2B79 operate?
Mode-S AA2B79 has broadcast 20 distinct callsigns, including UAL315, UAL2662, UAL496, UAL2181, UAL1927.