Apparatus

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sensors Mode-S transponder

AA79A6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N774UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AA79A6
Octal
52474646
Decimal
11,172,262
Country
US
Tail
N774UA
Type
B772
No current signal · last broadcast Jul 26, 18:20 UTC
Flights observed
265
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:20 UTC

Last known position

Most recent position reported by Mode-S AA79A6.

Country allocation

The ICAO 24-bit address AA79A6 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
UAL300 United Airlines 28 2026-07-26
UAL252 United Airlines 27 2026-07-26
UAL253 United Airlines 23 2026-07-26
UAL1158 United Airlines 20 2026-07-22
UAL1170 United Airlines 19 2026-07-22
UAL2358 United Airlines 15 2026-07-23
UAL1157 - 15 2026-07-20
UAL1169 United Airlines 14 2026-07-22
UAL604 United Airlines 11 2026-07-23
UAL2610 United Airlines 11 2026-07-24
UAL1818 United Airlines 10 2026-07-22
UAL1147 United Airlines 10 2026-07-25
UAL2480 United Airlines 8 2026-07-23
UAL1777 - 5 2026-06-24
UAL543 - 4 2026-06-24
UAL368 - 3 2026-06-23
UAL2278 United Airlines 3 2026-05-08
UAL1806 United Airlines 3 2026-05-27
UAL1791 - 3 2026-07-14
UAL1141 United Airlines 3 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL253 IAH → HNL Jul 26, 15:40 UTCJul 26, 18:20 UTC2h 40m
2026-07-26 UAL252 HNL → IAH Jul 26, 09:50 UTCJul 26, 13:20 UTC3h 30m
2026-07-26 UAL252 HNL → IAH Jul 26, 06:10 UTCJul 26, 06:25 UTC15m
2026-07-26 UAL300 SFO → HNL Jul 26, 02:00 UTCJul 26, 02:25 UTC25m
2026-07-25 UAL300 SFO → HNL Jul 25, 21:35 UTCJul 25, 22:00 UTC25m
2026-07-25 UAL1147 BOS → EWR Jul 25, 12:50 UTCJul 25, 17:50 UTC5h 0m
2026-07-24 UAL8291 YOW → YYZ Jul 24, 20:50 UTCJul 25, 01:10 UTC4h 20m
2026-07-24 UAL2610 IAD → PDX Jul 24, 14:20 UTCJul 24, 18:05 UTC3h 45m
2026-07-23 UAL2480 BOS → SFO Jul 23, 22:45 UTCJul 24, 02:10 UTC3h 25m
2026-07-23 UAL2358 SAN → EWR Jul 23, 14:55 UTCJul 23, 18:15 UTC3h 20m
2026-07-23 UAL604 DEN → SYR Jul 23, 08:00 UTCJul 23, 11:10 UTC3h 10m
2026-07-22 UAL1818 FLL → EWR Jul 22, 23:55 UTCJul 23, 00:10 UTC15m
2026-07-22 UAL1818 FLL → EWR Jul 22, 23:45 UTCJul 23, 04:03 UTC4h 18m
2026-07-22 UAL1158 LAX → HNL Jul 22, 16:30 UTCJul 22, 21:45 UTC5h 15m
2026-07-22 UAL1169 BDL → ORD Jul 22, 10:20 UTCJul 22, 12:20 UTC2h 0m
2026-07-22 UAL1170 LAX → HNL Jul 22, 00:15 UTCJul 22, 05:25 UTC5h 10m
2026-07-20 UAL1157 - Jul 20, 23:30 UTCJul 21, 04:30 UTC4h 59m
2026-07-19 UAL253 - Jul 19, 23:00 UTCJul 19, 23:10 UTC10m
2026-07-19 UAL253 - Jul 19, 15:40 UTCJul 19, 19:00 UTC3h 20m
2026-07-19 UAL252 - Jul 19, 06:10 UTCJul 19, 13:20 UTC7h 10m
2026-07-19 UAL252 HNL → IAH Jul 19, 06:08 UTCJul 19, 13:16 UTC7h 8m
2026-07-18 UAL253 - Jul 18, 15:30 UTCJul 18, 23:15 UTC7h 45m
2026-07-18 UAL252 - Jul 18, 10:00 UTCJul 18, 13:15 UTC3h 15m
2026-07-18 UAL252 - Jul 18, 06:05 UTCJul 18, 06:20 UTC15m
2026-07-17 UAL253 - Jul 17, 15:40 UTCJul 17, 23:25 UTC7h 45m
2026-07-17 UAL252 - Jul 17, 06:29 UTCJul 17, 13:45 UTC7h 15m
2026-07-16 UAL300 - Jul 16, 21:40 UTCJul 17, 02:20 UTC4h 40m
2026-07-16 UAL300 SFO → HNL Jul 16, 21:22 UTCJul 17, 02:19 UTC4h 57m
2026-07-15 UAL1147 IAD → SFO Jul 15, 12:55 UTCJul 15, 17:35 UTC4h 40m
2026-07-14 UAL1791 SFO → IAD Jul 14, 20:45 UTCJul 15, 01:25 UTC4h 39m
2026-07-14 UAL1147 - Jul 14, 12:50 UTCJul 14, 17:25 UTC4h 35m
2026-07-13 UAL8223 SFO → IAD Jul 13, 20:40 UTCJul 14, 01:15 UTC4h 35m
2026-07-13 UAL2610 - Jul 13, 14:50 UTCJul 13, 18:25 UTC3h 35m
2026-07-12 UAL2480 SFO → ORD Jul 12, 22:40 UTCJul 13, 02:20 UTC3h 40m
2026-07-12 UAL2358 - Jul 12, 16:20 UTCJul 12, 19:25 UTC3h 5m
2026-07-12 UAL604 - Jul 12, 08:05 UTCJul 12, 11:20 UTC3h 15m
2026-07-10 UAL1147 IAD → SFO Jul 10, 12:55 UTCJul 10, 18:00 UTC5h 5m
2026-07-09 UAL8112 SFO → IAD Jul 9, 20:55 UTCJul 10, 01:20 UTC4h 25m
2026-07-08 UAL1147 - Jul 8, 12:50 UTCJul 8, 17:45 UTC4h 55m
2026-07-07 UAL8291 SFO → IAD Jul 7, 20:50 UTCJul 8, 01:10 UTC4h 20m
2026-07-07 UAL2610 ORD → SFO Jul 7, 14:20 UTCJul 7, 18:25 UTC4h 5m
2026-07-06 UAL2480 - Jul 6, 22:35 UTCJul 7, 02:05 UTC3h 30m
2026-07-06 UAL2610 - Jul 6, 14:25 UTCJul 6, 18:10 UTC3h 45m
2026-07-06 UAL2610 ORD → SFO Jul 6, 14:21 UTCJul 6, 18:01 UTC3h 40m
2026-07-05 UAL2480 SFO → ORD Jul 5, 22:30 UTCJul 6, 02:00 UTC3h 30m
2026-07-05 UAL1147 - Jul 5, 14:15 UTCJul 5, 18:55 UTC4h 40m
2026-07-05 UAL1147 IAD → SFO Jul 5, 14:15 UTCJul 5, 18:41 UTC4h 26m
2026-07-04 UAL1791 SFO → IAD Jul 4, 20:40 UTCJul 5, 01:15 UTC4h 35m
2026-07-04 UAL1147 IAD → SFO Jul 4, 12:55 UTCJul 4, 17:29 UTC4h 34m
2026-07-04 UAL1147 - Jul 4, 12:50 UTCJul 4, 17:40 UTC4h 50m

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 N774UA page for operator, model, and routing details .

Mode-S AA79A6 frequently asked

What is Mode-S code AA79A6?
AA79A6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N774UA.
Where is Mode-S AA79A6 registered?
Mode-S code AA79A6 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 AA79A6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA79A6, octal 52474646, decimal 11,172,262.
What flights does AA79A6 operate?
Mode-S AA79A6 has broadcast 20 distinct callsigns, including UAL300, UAL252, UAL253, UAL1158, UAL1170.