Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AA7EC2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77558 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
AA7EC2
Octal
52477302
Decimal
11,173,570
Country
US
Tail
N77558
Type
B39M
No current signal · last broadcast Jul 26, 18:50 UTC
Flights observed
442
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:50 UTC

Last known position

Most recent position reported by Mode-S AA7EC2.

Country allocation

The ICAO 24-bit address AA7EC2 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
UAL279 - 5 2026-07-08
UAL2022 - 5 2026-06-20
UAL1590 United Airlines 5 2026-07-19
UAL1118 United Airlines 5 2026-06-20
UAL1052 United Airlines 5 2026-07-23
UAL665 United Airlines 4 2026-06-05
UAL2491 United Airlines 4 2026-06-07
UAL2444 United Airlines 4 2026-04-21
UAL1930 - 4 2026-06-24
UAL1624 United Airlines 4 2026-06-05
UAL1020 - 4 2026-07-02
UAL795 United Airlines 3 2026-04-27
UAL638 United Airlines 3 2026-05-17
UAL503 United Airlines 3 2026-04-26
UAL2785 United Airlines 3 2026-07-19
UAL2430 United Airlines 3 2026-05-23
UAL2428 - 3 2026-06-24
UAL2420 United Airlines 3 2026-05-07
UAL2384 United Airlines 3 2026-05-07
UAL2219 - 3 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL420 IAH → PUJ Jul 26, 15:35 UTCJul 26, 18:50 UTC3h 15m
2026-07-25 UAL1019 CUN → IAH Jul 25, 20:43 UTCJul 25, 22:17 UTC1h 34m
2026-07-25 UAL1019 CUN → IAH Jul 25, 20:30 UTCJul 25, 22:20 UTC1h 50m
2026-07-25 UAL1016 IAH → CUN Jul 25, 17:05 UTCJul 25, 19:00 UTC1h 55m
2026-07-25 UAL332 SFO → LAX Jul 25, 12:15 UTCJul 25, 15:20 UTC3h 5m
2026-07-24 UAL758 DEN → ORD Jul 24, 23:25 UTCJul 25, 01:20 UTC1h 55m
2026-07-24 UAL1391 LAS → EWR Jul 24, 19:50 UTCJul 24, 21:40 UTC1h 50m
2026-07-24 UAL1856 DEN → SFO Jul 24, 16:35 UTCJul 24, 18:05 UTC1h 30m
2026-07-24 UAL1878 LGA → ORD Jul 24, 11:54 UTCJul 24, 13:59 UTC2h 5m
2026-07-24 UAL1878 LGA → ORD Jul 24, 11:55 UTCJul 24, 14:15 UTC2h 20m
2026-07-24 UAL2126 EWR → MBJ Jul 24, 01:45 UTCJul 24, 05:00 UTC3h 15m
2026-07-23 UAL1948 IAH → SFO Jul 23, 18:30 UTCJul 23, 23:25 UTC4h 55m
2026-07-23 UAL1052 EWR → CUN Jul 23, 13:15 UTCJul 23, 16:30 UTC3h 15m
2026-07-23 UAL1052 EWR → CUN Jul 23, 13:05 UTCJul 23, 16:56 UTC3h 51m
2026-07-22 UAL1039 AUA → EWR Jul 22, 20:55 UTCJul 23, 01:20 UTC4h 25m
2026-07-22 UAL1674 RDU → EWR Jul 22, 14:50 UTCJul 22, 19:20 UTC4h 30m
2026-07-22 UAL1044 EWR → DEN Jul 22, 11:10 UTCJul 22, 12:20 UTC1h 10m
2026-07-21 UAL1284 EWR → SLC Jul 21, 23:40 UTCJul 22, 03:19 UTC3h 39m
2026-07-21 UAL1284 EWR → SLC Jul 21, 18:25 UTCJul 22, 03:20 UTC8h 55m
2026-07-20 UAL700 - Jul 20, 22:10 UTCJul 21, 01:30 UTC3h 19m
2026-07-20 UAL2038 - Jul 20, 17:35 UTCJul 20, 20:20 UTC2h 45m
2026-07-20 UAL2642 IAH → PHX Jul 20, 13:15 UTCJul 20, 16:05 UTC2h 50m
2026-07-20 UAL2114 - Jul 20, 01:20 UTCJul 20, 02:00 UTC40m
2026-07-19 UAL1590 EWR → IAH Jul 19, 23:55 UTCJul 20, 00:00 UTC5m
2026-07-19 UAL1590 EWR → IAH Jul 19, 20:34 UTCJul 19, 23:40 UTC3h 6m
2026-07-19 UAL1590 EWR → IAH Jul 19, 20:30 UTCJul 20, 00:00 UTC3h 30m
2026-07-19 UAL2080 ORD → SFO Jul 19, 16:00 UTCJul 19, 19:10 UTC3h 10m
2026-07-19 UAL2785 EWR → HNL Jul 19, 11:35 UTCJul 19, 13:55 UTC2h 20m
2026-07-18 UAL1892 - Jul 18, 23:20 UTCJul 19, 00:40 UTC1h 20m
2026-07-18 UAL486 MCO → CLE Jul 18, 16:05 UTCJul 18, 18:10 UTC2h 5m
2026-07-18 UAL2636 - Jul 18, 12:55 UTCJul 18, 14:55 UTC2h 0m
2026-07-18 UAL2131 SEA → IAD Jul 18, 02:30 UTCJul 18, 03:38 UTC1h 8m
2026-07-18 UAL2131 IAD → CLE Jul 18, 02:45 UTCJul 18, 03:30 UTC46m
2026-07-17 UAL1133 CUN → IAD Jul 17, 21:55 UTCJul 18, 00:55 UTC3h 0m
2026-07-17 UAL1276 - Jul 17, 15:35 UTCJul 17, 19:55 UTC4h 20m
2026-07-17 UAL1276 LAX → CUN Jul 17, 15:45 UTCJul 17, 19:50 UTC4h 5m
2026-07-17 UAL1670 - Jul 17, 08:30 UTCJul 17, 13:00 UTC4h 30m
2026-07-17 UAL1461 - Jul 17, 00:35 UTCJul 17, 02:59 UTC2h 25m
2026-07-16 UAL1123 - Jul 16, 20:15 UTCJul 16, 22:05 UTC1h 50m
2026-07-16 UAL1054 EWR → CUN Jul 16, 14:55 UTCJul 16, 18:18 UTC3h 23m
2026-07-16 UAL1054 - Jul 16, 14:50 UTCJul 16, 18:25 UTC3h 35m
2026-07-16 UAL1105 MCO → EWR Jul 16, 10:50 UTCJul 16, 13:00 UTC2h 10m
2026-07-15 UAL1900 EWR → MCO Jul 15, 21:10 UTCJul 15, 23:15 UTC2h 5m
2026-07-15 UAL1435 AUS → EWR Jul 15, 15:30 UTCJul 15, 18:45 UTC3h 15m
2026-07-15 UAL2035 - Jul 15, 10:30 UTCJul 15, 13:35 UTC3h 5m
2026-07-15 UAL2219 - Jul 15, 05:05 UTCJul 15, 08:35 UTC3h 30m
2026-07-15 UAL701 - Jul 15, 00:20 UTCJul 15, 00:30 UTC10m
2026-07-14 UAL701 - Jul 14, 20:15 UTCJul 14, 23:45 UTC3h 29m
2026-07-14 UAL462 - Jul 14, 14:20 UTCJul 14, 18:10 UTC3h 50m
2026-07-13 UAL1964 - Jul 13, 22:25 UTCJul 14, 02:10 UTC3h 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 N77558 page for operator, model, and routing details .

Mode-S AA7EC2 frequently asked

What is Mode-S code AA7EC2?
AA7EC2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77558.
Where is Mode-S AA7EC2 registered?
Mode-S code AA7EC2 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 AA7EC2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA7EC2, octal 52477302, decimal 11,173,570.
What flights does AA7EC2 operate?
Mode-S AA7EC2 has broadcast 20 distinct callsigns, including UAL279, UAL2022, UAL1590, UAL1118, UAL1052.