Apparatus

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sensors Mode-S transponder

AA7E74

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77530 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AA7E74
Octal
52477164
Decimal
11,173,492
Country
US
Tail
N77530
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
484
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AA7E74.

Country allocation

The ICAO 24-bit address AA7E74 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
UAL1212 United Airlines 5 2026-06-08
UAL2633 United Airlines 4 2026-05-11
UAL2098 - 4 2026-07-04
UAL1727 - 4 2026-07-08
UAL1706 United Airlines 4 2026-07-26
UAL1604 United Airlines 4 2026-06-09
UAL1501 United Airlines 4 2026-05-23
UAL1303 - 4 2026-07-09
UAL726 United Airlines 3 2026-07-24
UAL686 United Airlines 3 2026-04-16
UAL680 United Airlines 3 2026-06-04
UAL678 United Airlines 3 2026-07-23
UAL645 - 3 2026-06-22
UAL644 - 3 2026-07-02
UAL480 - 3 2026-07-10
UAL478 United Airlines 3 2026-06-05
UAL444 - 3 2026-07-06
UAL3938 - 3 2026-04-14
UAL361 United Airlines 3 2026-04-28
UAL2654 United Airlines 3 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2725 PDX → SFO Jul 26, 21:25 UTCJul 26, 23:00 UTC1h 35m
2026-07-26 UAL1706 ITO → LAX Jul 26, 17:25 UTCJul 26, 19:35 UTC2h 10m
2026-07-26 UAL226 BOS → IAH Jul 26, 11:25 UTCJul 26, 14:55 UTC3h 30m
2026-07-26 UAL2656 SNA → DEN Jul 26, 06:15 UTCJul 26, 09:40 UTC3h 26m
2026-07-26 UAL2436 DEN → MSY Jul 26, 02:05 UTCJul 26, 04:05 UTC2h 0m
2026-07-25 UAL2019 OGG → SFO Jul 25, 23:55 UTCJul 26, 00:45 UTC50m
2026-07-25 UAL1879 ORD → SJD Jul 25, 14:15 UTCJul 25, 21:45 UTC7h 30m
2026-07-25 UAL2446 FLL → EWR Jul 25, 00:55 UTCJul 25, 02:45 UTC1h 50m
2026-07-24 UAL1617 IAH → BOS Jul 24, 21:55 UTCJul 24, 23:35 UTC1h 40m
2026-07-24 UAL1617 IAH → BOS Jul 24, 22:06 UTCJul 24, 23:32 UTC1h 26m
2026-07-24 UAL1239 EWR → RDU Jul 24, 15:50 UTCJul 24, 17:20 UTC1h 30m
2026-07-24 UAL425 MCO → EWR Jul 24, 13:10 UTCJul 24, 14:35 UTC1h 25m
2026-07-24 UAL726 EWR → FLL Jul 24, 07:15 UTCJul 24, 10:15 UTC3h 0m
2026-07-24 UAL1360 IAD → RSW Jul 24, 01:55 UTCJul 24, 04:25 UTC2h 30m
2026-07-23 UAL1794 OGG → SFO Jul 23, 20:20 UTCJul 23, 23:45 UTC3h 25m
2026-07-23 UAL1794 OGG → SFO Jul 23, 20:14 UTCJul 23, 23:36 UTC3h 22m
2026-07-23 UAL678 LAS → SFO Jul 23, 15:00 UTCJul 23, 18:20 UTC3h 20m
2026-07-23 UAL434 EWR → IAH Jul 23, 11:00 UTCJul 23, 13:00 UTC2h 0m
2026-07-23 UAL1469 DFW → IAH Jul 23, 00:40 UTCJul 23, 02:45 UTC2h 5m
2026-07-22 UAL1570 RNO → SFO Jul 22, 21:00 UTCJul 22, 23:10 UTC2h 10m
2026-07-22 UAL1570 RNO → SFO Jul 22, 20:47 UTCJul 22, 23:08 UTC2h 21m
2026-07-22 UAL1569 IAH → BZE Jul 22, 17:40 UTCJul 22, 19:15 UTC1h 35m
2026-07-22 UAL2827 - Jul 22, 14:45 UTCJul 22, 15:25 UTC40m
2026-07-22 UAL2250 - Jul 22, 12:45 UTCJul 22, 13:20 UTC35m
2026-07-21 UAL518 IAH → XPL Jul 21, 14:55 UTCJul 21, 21:15 UTC6h 20m
2026-07-21 UAL532 DEN → ORD Jul 21, 11:25 UTCJul 21, 13:00 UTC1h 35m
2026-07-21 UAL2050 - Jul 21, 00:30 UTCJul 21, 02:05 UTC1h 35m
2026-07-20 UAL1242 SAP → IAH Jul 20, 19:15 UTCJul 20, 21:05 UTC1h 50m
2026-07-20 UAL1487 - Jul 20, 15:05 UTCJul 20, 15:55 UTC50m
2026-07-20 UAL1487 IAH → SAP Jul 20, 15:01 UTCJul 20, 17:30 UTC2h 29m
2026-07-20 UAL756 - Jul 20, 10:50 UTCJul 20, 13:15 UTC2h 25m
2026-07-19 UAL2725 PDX → SFO Jul 19, 21:55 UTCJul 20, 00:10 UTC2h 15m
2026-07-19 UAL1706 ITO → LAX Jul 19, 19:55 UTCJul 19, 20:10 UTC15m
2026-07-19 UAL1706 ITO → LAX Jul 19, 17:35 UTCJul 19, 19:00 UTC1h 25m
2026-07-19 UAL1706 ITO → LAX Jul 19, 17:27 UTCJul 19, 19:40 UTC2h 13m
2026-07-19 UAL2319 TPA → IAH Jul 19, 13:27 UTCJul 19, 15:12 UTC1h 45m
2026-07-19 UAL2319 - Jul 19, 13:20 UTCJul 19, 15:15 UTC1h 55m
2026-07-17 UAL1312 - Jul 17, 23:30 UTCJul 18, 01:15 UTC1h 45m
2026-07-17 UAL2103 - Jul 17, 19:35 UTCJul 17, 20:50 UTC1h 15m
2026-07-17 UAL707 IAH → SJD Jul 17, 14:55 UTCJul 17, 16:57 UTC2h 2m
2026-07-17 UAL707 - Jul 17, 14:39 UTCJul 17, 15:55 UTC1h 15m
2026-07-17 UAL631 - Jul 17, 07:30 UTCJul 17, 11:35 UTC4h 5m
2026-07-17 UAL1359 - Jul 17, 01:55 UTCJul 17, 06:00 UTC4h 5m
2026-07-16 UAL1570 - Jul 16, 22:05 UTCJul 16, 22:55 UTC50m
2026-07-16 UAL1569 - Jul 16, 17:20 UTCJul 16, 19:10 UTC1h 50m
2026-07-16 UAL2228 - Jul 16, 13:40 UTCJul 16, 15:14 UTC1h 35m
2026-07-16 UAL2228 MCI → IAH Jul 16, 13:45 UTCJul 16, 15:09 UTC1h 24m
2026-07-16 UAL1596 - Jul 16, 03:05 UTCJul 16, 04:20 UTC1h 15m
2026-07-15 UAL1236 - Jul 15, 22:55 UTCJul 16, 01:20 UTC2h 25m
2026-07-15 UAL1767 DEN → YVR Jul 15, 18:25 UTCJul 15, 20:55 UTC2h 30m

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 N77530 page for operator, model, and routing details .

Mode-S AA7E74 frequently asked

What is Mode-S code AA7E74?
AA7E74 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77530.
Where is Mode-S AA7E74 registered?
Mode-S code AA7E74 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 AA7E74 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA7E74, octal 52477164, decimal 11,173,492.
What flights does AA7E74 operate?
Mode-S AA7E74 has broadcast 20 distinct callsigns, including UAL1212, UAL2633, UAL2098, UAL1727, UAL1706.